Bibliografie tematiche / Behavior of connectors

Letteratura scientifica selezionata sul tema "Behavior of connectors"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Behavior of connectors":

Zhang, Zhigang, e Xiaoqing Xu. "Static and Fatigue Behavior of Rubber-Sleeved Stud Shear Connectors as Part of Field-Cast Ultra-High Performance Concrete Connections". Materials 13, n. 10 (14 maggio 2020): 2269. http://dx.doi.org/10.3390/ma13102269.

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Field-cast ultra-high performance concrete (UHPC) connections are an innovative and prospective solution for combining full-depth precast concrete decks and steel girders. However, previous studies show that the slip capacity of stud shear connectors embedded in UHPC cannot meet the requirements for ductile connectors by Eurocode 4, which can reduce the resistance of steel and concrete composite members. In this study, the rubber-sleeved stud shear connector, which is a composite of ordinary stud and rubber sleeve, was adopted for the field-cast UHPC connections. Push-out tests were conducted to investigate the static and fatigue behavior of the rubber-sleeved stud shear connector as part of field-cast UHPC connections. Results of static tests showed that the rubber-sleeved stud shear connector has sufficient deformation capacity and its slip capacity is 1.5 times that of the ordinary stud shear connector. Compared to ordinary stud shear connectors, UHPC with high strength and stiffness has a relatively small effect on improving the shear strength and stiffness of rubber-sleeve stud shear connectors. Results of fatigue tests showed that the rubber-sleeved stud shear connector in UHPC has similar fatigue behavior to that in normal strength concrete. Though UHPC improves the restraint to the stud deformation, the influence of rubber sleeves is still decisive in determining the fatigue behavior of rubber-sleeve stud shear connectors. In addition, based on the results of strain gauges at stud roots, it was found that the crack initiation process consumes a small proportion of the fatigue life of rubber-sleeved stud shear connectors, which is about 5%.

Farid, Boursas, e Djamel Boutagouga. "Parametric study of I-shaped shear connectors with different orientations in push-out test". Frattura ed Integrità Strutturale 15, n. 57 (22 giugno 2021): 24–39. http://dx.doi.org/10.3221/igf-esis.57.03.

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A great deal of research has been conducted to improve the understanding of the behavior of new types of shear connectors. This article presents the study of I-shaped connectors behavior under monotonic load welded in four different orientations in order to get the position which gives the high shear strength and the best ductility. For this purpose, eight push-out test specimens with I-shaped shear connectors with different orientations and dimensions were tested in C20/25 and C30/37 concrete classes. The load-slip behavior and failure modes of the tested connectors are presented and discussed. Furthermore, a non-linear 3D finite element modelling of the push-out test is performed in order to further investigate the influencing parameters on the I-shaped connectors behavior. Hence, a parametric study is carried out by using the established 3D finite elements model to study the influence of concrete strength, connector’s steel grade, reinforcements, height and length of the connector. Both experimental and numerical results show that there is a privilege orientation for which the shear strength of an I-shaped shear connector is significantly higher than that of all other tested orientations.

Kocatas, Alper Tolga, e Ali Hikmet Dogru. "Enhancing UML Connectors with Behavioral ALF Specifications for Exogenous Coordination of Software Components". Applied Sciences 13, n. 1 (3 gennaio 2023): 643. http://dx.doi.org/10.3390/app13010643.

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Connectors are powerful architectural elements that allow the specification of interactions between software components. Since the connectors do not include behavior in UML, the components include the behavior for coordinating the components, complicating the designs of components and decreasing their reusability. In this study, we propose the enrichment of UML connectors with behavioral specifications. The goal is to provide separation of concerns for the components so that they are freed from coordination duties. The reusability of the components will increase as a result of such exogenous coordination. Additionally, using the associated behaviors, we aim to resolve the ambiguities that arise when n-ary connectors are used. We use a series of QVTo transformations to transform UML models that include connector behaviors in ALF specifications into UML models which include fUML activities as connector behavior specifications. We present a set of example connectors specified using the proposed method. We execute the QVTo transformations on the example connectors to produce models that represent platform-independent definitions of the coordination behaviors. We also present and discuss cases from real-life large-scale avionics software projects in which using the proposed approach results in simpler and more flexible designs and increases component reusability.

Larrañaga Rubio, Sherley, e Maritzabel Molina Herrera. "Grade-two resistance screw shear connector behavior for a 28 MPa concrete section". Ingeniería e Investigación 27, n. 2 (1 maggio 2007): 18–25. http://dx.doi.org/10.15446/ing.investig.v27n2.14825.

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Screw shear connectors are being more commonly used in compound concrete sections in Colombia; however, they have been designed in line with Colombian Seismic-Resistant Standards (NSR-98) rather than those established for stud shear connectors. This work represents a starting point for analysing screw shear connector behavior. 54 specimens were made for the experiment, consisting of a metallic profile and two concretes slabs where the connectors were embedded. 1/2” (12.7mm), 5/8” (15.9mm) and 3/4” (19.1mm) diameter screws were used and placed at different distances. The push-out test was used with these specimens and results were provided by using some equations for determining this type of connector’s strength in steel-concrete sections.

Chen, Dong, Kuaikuai Li, Zhiyang Yuan, Baoquan Cheng e Xing Kang. "Shear Behavior of FRP Connectors in Precast Sandwich Insulation Wall Panels". Buildings 12, n. 8 (26 luglio 2022): 1095. http://dx.doi.org/10.3390/buildings12081095.

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Glass fiber reinforced polymer (FRP) composite connectors used in precast sandwich insulation wall panels directly affect the safety of the wall. In practical applications, a precast concrete sandwich insulation wall panel is transported to the construction site for hoisting 3–5 days after steam curing, and its concrete strength typically reaches approximately 70% of the design strength (i.e., the concrete strength after natural curing for 14 days). This study investigated the natural curing of concrete for 14 days and analyzed the mechanical properties of FRP connectors with two different sections in terms of their failure mode, failure process, and load–displacement curves. Numerical analysis and finite element parametric analysis of the connectors were conducted based on experimental data. The average ultimate shear capacity of a single rectangular-section connector was 8.37 kN and that of the cross-section connector was 8.37 kN. The connectors exhibited a good shear resistance, and the rectangular-section connectors had better ductility than the cross-section connectors. The wall panel exhibited three types of failure modes: splicing failure of the fiber layer of the connector, fiber fracture in the anchorage of the connector, failure of the concrete of the anchorage, and mainly material damage of the connector itself. The error between the load simulation value and test value of a single connector was less than 10% of the numerical simulation error requirement, and the finite element simulation results were reliable. The results of the parametric simulation of the shear capacity showed that the distance between connectors, anchorage depth, and insulation layer thickness had a significant influence on the shear performance of concrete connectors.

Xue, Guofeng, Wei Bao, Jin Jiang e Yongsong Shao. "Hysteretic Behavior of Beam-to-Column Joints with Cast Steel Connectors". Shock and Vibration 2019 (29 novembre 2019): 1–20. http://dx.doi.org/10.1155/2019/9802672.

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This study proposed a beam-to-column joint equipped with a new type of cast steel connector. The cast steel connector concentrated the primary portion of the deformation and energy dissipation of the joint and was installed with full bolted connections, rendering it a replaceable energy dissipation component and facilitating the rapid repair of the joint after an earthquake. Three full-scale specimens were fabricated and tested to investigate the hysteretic behaviors of the proposed joints under cyclic loadings. The results showed that the proposed cast steel connector exhibited reliable ductility and energy dissipation capacity. The beam-to-column joints with cast steel connectors under appropriate configuration can limit the deformation to the cast steel connector and protect the remaining joint components from plastic deformation. A more detailed finite element analysis was performed to investigate the hysteretic behavior of the joint further. The FEM results illustrated that the thickness of the vertical leg of the cast steel connector can significantly influence the stiffness and bearing capacity of the joint. Meantime, it would improve the hysteretic behavior effectively. The proposed beam-to-column joints with cast steel connectors can achieve the requirement of stiffness and load-bearing capacity and can be widely applicable in practical engineering.

Liu, Xia, Xin Wang, Tan Yang e Zhishen Wu. "The Shear Behavior of Insulated Precast Concrete Sandwich Panels Reinforced with BFRP". Buildings 12, n. 9 (30 agosto 2022): 1326. http://dx.doi.org/10.3390/buildings12091326.

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Typical insulated precast concrete sandwich panel (PCSP) systems are composed of two concrete wythes separated by a layer of insulation. The structural behavior of insulated PCSP systems heavily depends on elements between two wythes known as connectors, which ensure they work as a whole. Double shear tests were carried out on 58 insulated PCSP specimens reinforced with basalt fiber-reinforced polymer (BFRP) connectors; failure modes, load displacement curves and bearing capacity of BFRP connectors were obtained. Effects of diameter, insulation thickness, installation angle, layout spacing and combined action on shear capacity were analyzed. The results show that the span ratio of the connector was suggested to be less than 15, and the angle of the connector should be set to 60° or 75° for suitable stiffness and bearing capacity with an abundant safety margin. The shear capacity decreases slightly with the increase in the connectors’ spacing while the overall impact is small. The shear force of connectors in a plane or spatial combination can be calculated according to that of one single connector. Moreover, the shear capacity model of BFRP connectors proposed in this paper provides a favorable design option for insulated PCSP systems using BFRP connectors.

Guo, Jiangran, Qingxuan Shi, Ge Ma e Tengfei Li. "Shear Behavior of Superposed Perfobond Connectors Considering Lateral Constraints". Applied Sciences 12, n. 6 (20 marzo 2022): 3162. http://dx.doi.org/10.3390/app12063162.

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Superposed perfobond connectors are a type of connector used in composite structures. When the construction conditions are limited to increase the diameter of the opening, the shear capacity of the connector can be improved by enhancing the confining effect of the concrete dowel. In this study, 12 superposed perfobond connectors were fabricated to investigate the influence of lateral constraints on their shear behavior. The effects of hole area and holes’ number, diameter of the perforating rebar, concrete compressive strength, and the number of transverse reinforcements were investigated via the failure modes and load–slip curves. The results indicate that double-sided shear failure occurs in connectors with perfobond rib thicknesses exceeding 9 mm, and the connectors featuring strong lateral constraints not only exhibited higher bearing capacities but also superior load-holding capacities after peak load. Finally, an equation for the shear capacity of multi-hole perfobond connectors, considering lateral constraints, was proposed according to the double-sided shear theory.

Wang, Xizhi, Yuqing Liu e Yangqing Liu. "Experimental study on shear behavior of notched long-hole perfobond connectors". Advances in Structural Engineering 22, n. 1 (2 luglio 2018): 202–13. http://dx.doi.org/10.1177/1369433218782991.

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It is restricted in applying perfobond connectors in steel-concrete composite bridges with shallow rib heights or narrow connector distances, because it is unfavorable to enhance shear connection by enlarging hole diameter of perfobond connectors and difficult to install transverse rebars in perforated holes. To address this issue, an alternative perfobond connector was proposed by making a notch on the outer edge of the lengthened circular hole in this paper. To investigate the differences of failure mode, shear strength, slip behavior, and load transferring mechanism between circular-hole and notched long-hole perfobond connectors, a total of eight push-out tests were performed. Experimental results show that the shear strength of notched long-hole perfobond connectors exhibits an increase of about 20% compared with that of circular-hole perfobond connectors, and the shear stiffness and peak slip increase by over 10%. The enlarged hole area in notched long-hole perfobond connectors could weaken contribution percentage of concrete dowel to shear capacities, although the shear strength increases as the product of concrete compressive strength and hole area raises. Repeated loading hardly impacts shear strength of perfobond connectors but raises peak slip by 11% and 14% of circular-hole and notched long-hole perfobond connectors, respectively. Compared with single-row connectors, multi-row connectors exhibit a reduction of about 5% in shear capacities and an increase of about 10% in peak slips. The first row along the shear direction in multi-row connectors would bear the maximum percentage of shear load. Based on push-out test results, several typical existing equations for predictions of shear strength are compared and evaluated.

Zhang, Chikun, Kewei Ding e Shulin He. "Seismic Performance of Panel Connectors with Steel Frame Based on Autoclaved Lightweight Concrete (ALC)". Buildings 12, n. 3 (17 marzo 2022): 372. http://dx.doi.org/10.3390/buildings12030372.

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This paper proposes new prefabricated autoclaved lightweight concrete (ALC) connectors which allow limited sliding. The seismic performance of the proposed connectors and a traditional connector (L-hooked bolt) were investigated in depth. Three specimens of full-scale steel frames with ALC panel and connectors were subjected to horizontal low-cyclic loading. The failure modes, hysteretic behavior, strength and deterioration of stiffness and energy-dissipating performance of all specimens were analyzed and discussed. The experimental results indicated that the frames of the new connectors were more reliable than the traditional connector. The energy-dissipating capacity of the specimen frames with new connectors increased by 23.0% and 24.4%, and deterioration of stiffness increased by 10.6% and 13.0%. The new ALC panel connectors not only increased elastic stiffness in the early stage, but also provided some stiffness in the elastoplastic and plastic stages. Using relevant construction measures, the frames with new connectors displayed good cooperative behavior and safety reliability. To summarize, the new ALC connectors tested showed excellent performance in resisting seismic loading and had good assembly efficiency and could provide a basis for the development and application of a new type of ALC steel frame connector.

Più fonti

Tesi sul tema "Behavior of connectors":

Rambo-Roddenberry, Michelle. "Behavior and Strength of Welded Stud Shear Connectors". Diss., Virginia Tech, 2002. http://hdl.handle.net/10919/26989.

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The behavior and strength of welded shear studs are subjects of ongoing study. In recent years, research has shown that the American Institute of Steel Construction (AISC) specification equations for shear stud strength are unconservative for studs placed in deck with ribs transverse to the steel beam. Twenty-four solid slab push-out tests, 93 composite slab push-out tests, and bare stud tests were performed to study the effects on stud strength of friction, normal load, position of studs in the ribs of steel deck, concrete strength, and stud properties. Stud diameters ranged from 3/8 in. to 7/8 in., deck heights ranged from 2 in. to 6 in., and both single and pairs of studs were tested. The push-out test results from this study were combined with other studies to propose a new stud strength prediction model. Three new beam tests were performed to study the effect of the stud position in the ribs of the steel deck. The results of these tests, along with 61 other beam tests, were used to verify the new stud strength prediction model. A reliability study was performed to determine resistance factors for stud strength and beam strength.
Ph. D.

Sullivan, Sean Robert. "Construction and Behavior of Precast Bridge Deck Panel Systems". Diss., Virginia Tech, 2007. http://hdl.handle.net/10919/27479.

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A bridge with precast bridge deck panels was built at the Virginia Tech Structures Laboratory to examine constructability issues, creep and shrinkage behavior, and strength and fatigue performance of transverse joints, different types of shear connectors, and different shear pocket spacings. The bridge consisted of two AASHTO type II girders, 40 ft long and simply supported, and five precast bridge deck panels. Two of the transverse joints were epoxied male-female joints and the other two transverse joints were grouted female-female joints. Two different pocket spacings were studied: 4 ft pocket spacing and 2 ft pocket spacing. Two different shear connector types were studied: hooked reinforcing bars and a new shear stud detail that can be used with concrete girders. The construction process was well documented. The change in strain in the girders and deck was examined and compared to a finite element model to examine the effects of differential creep and shrinkage. After the finite element model verification study, the model was used to predict the long term stresses in the deck and determine if the initial level of post-tensioning was adequate to keep the transverse joints in compression throughout the estimated service life of the bridge. Cyclic loading tests and shear and flexural strength tests were performed to examine performance of the different pocket spacings, shear connector types and transverse joint configurations. A finite element study examined the accuracy of the AASHTO LRFD shear friction equation for the design of the horizontal shear connectors. The initial level of post-tensioning in the bridge was adequate to keep the transverse joints in compression throughout the service life of the bridge. Both types of pocket spacings and shear connectors performed exceptionally well. The AASHTO LRFD shear friction equation was shown to be applicable to deck panel systems and was conservative for determining the number of shear connectors required in each pocket. A recommended design and detailing procedure was provided for the shear connectors and shear pockets.
Ph. D.

Kloak, David G. "Strong Emotive Connectors| A Study of a Social Skill and Effective Team Performance". Thesis, Alliant International University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10267146.

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Organizational success and outcomes rely on good teamwork. The study question asked if teams can be more successful with a greater number of socially skilled team members? Evolving research indicates composing teams based on intrinsic social skills, such as personality, values, and psychological roles may generate greater team outcomes than teams based solely on vocational roles, competencies, and cognitive ability. When teams are first formed, people connect instinctively and warm to other team members using their social skills. Only later do people appraise others for competencies and skills. This study examined whether the number of strong emotive connectors (SEC) can increase team outcomes. The study hypothesis tested whether teams with a greater number of high SECs, a socioemotional role construct, would increase their team task-completion rates (TTCR). Regression analysis showed the low and high SEC with an adjusted R² = .52 correlation were both predictive of the TTCR. Additional analysis using 2 one-way ANOVAs for high and low SECs showed between-team (groups) and within teams (groups) results were statistically significant at the p = .00 level. The study found teams having 2 of 5 high SECs made a difference in team performance. Additional high SECs had no impact on team performance. An interesting study result found 2 of 5 low SECs had an adverse impact on team performance. Additional low SECs did not harm team performance. Ensuring at least 2 of 5 high SECs on teams can lessen gaps, diminish conflicts, and elevate team outcomes.

Rao, Yang. "Mechanical behavior characterization of some new materials for high density interconnect substrates". Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/19286.

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Mujagic, Ubejd. "Design and Behavior of Composite Steel-Concrete Flexural Members with a Focus on Shear Connectors". Diss., Virginia Tech, 2004. http://hdl.handle.net/10919/26745.

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This study consists of three self-standing parts, each dealing with a different aspect of design of composite steel-concrete flexural members. The first part deals with a new type of shear connection in composite joists. Composite steel-concrete flexural members have increasingly become popular in design and construction of floor systems, structural frames, and bridges. A particularly popular system features composite trusses (joists) that can span large lengths and provide empty web space for installation of typical utility conduits. One of the prominent problems with respect to composite joists has been the installation of welded shear connection due to demanding welding requirements and the need for significant welding equipment at the job site. This part of the study presents a new type of shear connection developed at Virginia Tech â standoff screws. Results of experimental and analytical research are presented, as well as the development of a recommended design methodology. The second part deals with reliability of composite beams. Constant research advances in the field of composite steel-concrete beam design have resulted in numerous enhancements and changes to the American design practice, embodied in the composite construction provisions of the AISC Specification (AISC 1999). Results of a comprehensive reliability study of composite beams are presented. The study considers specification changes since the original reliability study by Galambos et al. (1976), considers a larger database of experimental data, and analyses recent proposals for changes in design of shear connection. Comparison of three different design methods is presented based on a study of 15,064 composite beam cases. A method to consider effect of degree of shear connection on strength reduction factor is proposed. Finally, while basic analysis theories between the two are similar, requirements for determining the strength of composite beams in Eurocode 4 (CEN 1992) and 1999 AISC Specification (AISC 1999) differ in many respects. This is particularly true when considering the design of shear connections. This part of the dissertation explores those differences through a comparative step-by-step discussion of major design aspects, and accompanying numerical example. Several shortcomings of 1999 AISC Specification are identified and adjustments proposed.
Ph. D.

Tabet-Derraz, Moulay Idriss. "Comportement et modélisation des connecteurs dans une structure mixte (acier-béton)". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0092.

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Le principe des poutres mixtes acier-béton est d'associer une dalle de béton et une poutre en acier pour un travail en commun. Les connecteurs de cisaillement sont des outils mécaniques qui ont le rôle d'assurer la connexion entre les deux matériaux à l'interface des poutres mixtes. Une variété de connecteurs de cisaillement a été proposée dans la littérature afin de fournir un comportement approprié à l'interface acier-béton. Les connecteurs à goujon à tête sont les plus largement utilisés dans la construction mixte en raison des recommandations des codes du bâtiment. Cependant, ces derniers présentent des inconvénients notables en termes de performances structurelles et de praticabilité sur les chantiers. Dans cette présente thèse, un nouveau type de connecteur innovant en forme d'OMEGA a été proposé en deux conceptions géométriques (forme primaire et forme améliorée) pour être une alternative aux connecteurs conventionnels. En plus d'avoir un processus de fabrication simple et une installation pratique à l'interface de la poutre mixte, la forme de ce connecteur permet une grande surface de béton confiné, le rendant ainsi plus résistant au cisaillement et au soulèvement de la dalle. Dans cette recherche, des tests expérimentaux de push-out ont été effectués sur le connecteur OMEGA avec différentes configurations pour étudier leur résistance, leur ductilité et leur mode de ruine dans la connexion acier-béton. Des spécimens de push-out supplémentaires avec les connecteurs conventionnels de type goujon à tête ont également été testés dans le but de comparer les performance des connecteurs OMEGA avec celles des goujons à tête standard. Les résultats ont démontré que le connecteur en forme d'OMEGA proposé présente un comportement intéressants dans la connexion acier-béton et pourrait donc être utilisé comme connecteur de cisaillement alternatif pour les poutres mixtes. De plus, un modèle numérique EF de l'essai de push-out sur les connecteurs OMEGA a été développé dans cette thèse à l'aide du logiciel Abaqus. Le but est d'approfondir les investigations sur ce connecteur proposé, en menant une étude paramétrique qui vise à évaluer les influences des dimensions du connecteur et de la résistance de la dalle de béton sur le comportement interne de la connexion acier-béton. En outre, en exploitant les résultats de l'étude paramétrique, une équation de prédiction de la résistance au cisaillement des connecteurs OMEGA a également été développée. Par ailleurs, des essais de poutre mixte avec les connecteurs OMEGA disposés à l'interface ont également été réalisés dans le cadre de cette thèse, en réalisant un spécimen de poutre mixte avec une connexion complète et un autre avec une connexion partielle. L'objectif de cette étude est d'analyser l'influence du comportement des connecteur OMEGA dans la connexion sur le comportement global de la poutre mixte. Les résultats ont affirmé que l'utilisation des connecteur OMEGA assure un comportement adéquat aux poutres mixtes, même avec un degré de connexion réduit
The principle of steel-concrete composite beams is to combine a concrete slab and a steel beam for joint work. Shear connectors are mechanical tools that have the role of ensuring the connection between the two materials at the interface of the composite beams. A variety of shear connectors have been proposed in the literature to provide suitable behavior at the steel-concrete interface. Headed stud connectors are most widely used in composite construction due to building code recommendations. However, the latter have significant drawbacks in terms of structural performance and practicability on construction sites. In this present thesis, an innovative new type of OMEGA-shaped connector has been proposed in two geometric designs (primary shape and improved shape) to be an alternative to conventional connectors. In addition to having a simple fabrication process and convenient installation at the composite beam interface, the shape of this connector allows for a large confined concrete zone, making it more resistant to shear and slab uplift. In this research, experimental push-out tests were performed on OMEGA connector with different configurations to study their strength, ductility and failure mode in the steel-concrete connection. Additional push-out specimens with conventional headed stud type connectors were also tested in order to compare the performance of OMEGA connectors with that of standard headed studs. The results demonstrated that the proposed OMEGA-shaped connector exhibited interesting behavior in steel-concrete connection and which can be used as an alternative shear connector for composite beams. In addition, an FE numerical model of the push-out test on OMEGA connectors was developed in this thesis using Abaqus software. The goal is to deepen the investigations on this proposed connector, by conducting a parametric study that aims to evaluate the influences of connector dimensions and concrete slab strength on the internal behavior of the steel-concrete connection. Moreover, by exploiting the parametric study results, an equation for predicting the OMEGA connectors shear strength was also developed. Furthermore, composite beam tests with OMEGA connectors arranged at the interface were also carried out as part of this thesis, by producing a composite beam specimen with a complete connection and another with a partial connection. The objective of this study is to analyze the influence of OMEGA connectors mechanism in the connection on the overall behavior of the composite beam. The results affirmed that the use of OMEGA connectors ensure adequate behavior to composite beams, even with a reduced degree of connection

Harman, Kelly. "Structural integrity of lightweight wood truss assemblies exposed to fire : an insight to the behavior of metal truss plate connectors /". Available to subscribers only, 2006. http://proquest.umi.com/pqdweb?did=1136091331&sid=23&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Perrinet, Olivier. "Analyse de l'endurance de contacts électriques Sn, Au et Ag soumis à des sollicitations complexes de fretting usure". Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0009.

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Abstract (sommario):

Dans les applications automobiles et dans d'autres domaines (énergie, aviation, etc), le nombre d'appareils électroniques a augmenté de façon significative au cours des dernières décennies. La sécurité des systèmes et des personnes repose sur la qualité de connecteurs électriques. Toutefois, soumis à des vibrations (moteur de la voiture, de l'environnement) des microdéplacements sont induits à l’interface. La problématique du contact électrique est principalement liée à l'altération de la conduction de faible courant (5mA) dans les interfaces soumises à des contraintes mécaniques de glissement répétitifs engendrant un phénomène bien connu de fretting par l’usure. La sollicitation de fretting usure apparait comme un processus de dégradation très pénalisant. Outre la détérioration des surfaces, ce processus conduit à une augmentation de la résistance électrique des contacts et à une possible perte du signal électrique. Ceci est particulièrement le cas pour les connecteurs bas niveau très sensibles aux fluctuations de la résistance électrique. Pour remédier à cela, les acteurs de la connectique développent de nouveaux dépôts pour limiter l’utilisation de dépôts nobles tels que l’or. Les objectifs de cette thèse sont d’établir une "table d’utilisation" des revêtements en fonction de sollicitations précises et de mettre en place une méthodologie dans le choix des dépôts en vue d’optimiser la durée de vie des connecteurs. L’étude aborde différents aspects tels que les influences des conditions de chargements mécaniques, des épaisseurs de dépôts, du type de dépôt (noble, non noble, dopé), de l’amplitude de débattement (micro-déplacement et grand déplacement) et la formalisation de l’endurance électrique (loi puissance et approche énergétique)
In automotive applications and in other areas (energy, aviation, etc.), the number of electronic devices has increased significantly in recent last decades. Systems and people securities are based on the quality of electrical connectors. However, submitted to vibrations (car engine, environment) micro-displacements are induced at the interface. The problem of electrical contact is mainly due to the impairment of low current conduction (5mA) in interfaces subjected to repetitive sliding displacement generating a well-known fretting wear phenomenon. Fretting wear solicitation appears as a process of very detrimental degradation. Besides surface deterioration, this process leads an increase of the electrical contact resistance and a possible loss of the electrical signal. This is particularly the case of the low level connectors which are very sensitive to electrical contact fluctuations. To remedy, connections actors develop new deposits to limit the use of noble ones such as gold. The objectives of this thesis are to establish a "table of use" coatings based on specific solicitations and define a methodology for the selection of deposits to optimize the lifetime connectors. The study covers different aspects such as the mechanical loading conditions influence, the thickness deposits influence, the type of deposit (noble, non-noble, doped), the displacement amplitude (microdisplacement and large displacement) and the electrical endurance formalization (energetic approach and power law)

Rehman, Naveed Ur. "Behaviour of demountable shear connectors in composite structures". Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/14790.

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The research presented in this thesis is to evaluate the feasibility of demountable shear connectors as an alternative to welded shear connectors in composite structures through push off tests and composite beam tests. Push off tests were conducted to examine the shear strength, stiffness and ductility of demountable shear connectors in composite structures. The experimental results showed that demountable shear connectors in composite structures have very similar shear capacity to welded shear connectors. The shear capacity was compared against the prediction methods used for the welded shear connections given in Eurocode 4 and AISC 360-10 and the methods used for bolted connections in Eurocode 3 and ACI 318-08. It was found that the AISC 360-10 and ACI 318-08 methods overestimated the shear capacity in some cases. The Eurocode method is conservative and can be utilised to predict the shear capacity of demountable connectors in composite structures. The experimental studies of two identical composite beams using demountable shear connectors and welded shear connectors showed very similar moment capacity. However, the specimen with demountable shear connectors was more ductile compared to the welded specimen. The experimental study suggests that the methods available in Eurocode 4 and BS 5950 for predicting moment capacity and mid span deflection can be adopted for composite beam with demountable shear connectors. In addition, a finite element analysis of push off test and beam test with demountable shear connectors was also conducted for parametric studies and results are used to evaluate the behaviour of composite structures.

Rehman, Naveed. "Behaviour of demountable shear connectors in composite structures". Thesis, University of Bradford, 2017. http://hdl.handle.net/10454/14790.

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Più fonti

Libri sul tema "Behavior of connectors":

Madsen, Borg. Behaviour of timber connections. North Vancouver: Timber Engineering, 2000.

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Elizabeth, Noble. Primal connections. New York: Simon & Schuster, 1993.

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State-of-the-Art Workshop on Connections and the Behaviour, Strength, and Design of Steel Structures (1987 Cachan, France). Connections in steel structures: Behaviour, strength, and design. London: Elsevier Applied Science, 1988.

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Restrepo, J. I. Seismic behaviour of connections between precast concrete elements. Christchurch, N.Z: University of Canterbury, Dept. of Civil Engineering, 1993.

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Bass, Andrea J. Behaviour of polymeric composite connections in pultruded frames. [s.l.]: typescript, 1994.

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Patterson, Paul H. Infectious behavior: Brain-immune connections in autism, schizophrenia, and depression. Cambridge, Mass: MIT Press, 2011.

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Erdman, Phyllis. Attachment: Expanding the cultural connections. New York: Routledge, 2010.

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Belcastro, Philip A., Robert J. McDermott, Robert S. Gold e Kathleen Mullen-Conley. Connections For Health (Black & White). 4^a ed. Boston, MA: WCB/McGraw-Hill, 1995.

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Aguilera, Hector Feliciano Pons. Dynamic behavior of tubular bracing members with single plate concentric connections. Ottawa: National Library of Canada = Bibliothèque nationale du Canada, 1999.

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Smart, Diana. Patterns and precursors of adolescent antisocial behaviour: Outcomes and connections. Melbourne: Australian Institute of Family Studies, 2005.

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Capitoli di libri sul tema "Behavior of connectors":

Li, Yi, Xiyue Zhang, Yuanyi Ji e Meng Sun. "Capturing Stochastic and Real-Time Behavior in Reo Connectors". In Lecture Notes in Computer Science, 287–304. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70848-5_18.

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Moka, Vijay Tarun Kumar, e R. Siva Chidambaram. "Experimental Investigation on Flexural Behavior of Precast Beam–Beam Connections Using Mechanical Connectors". In Lecture Notes in Civil Engineering, 627–37. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1608-5_45.

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Fang, H. "Behavior of bolted shear connectors for demountable and reusable UHPC-formed composite beams". In Life-Cycle of Structures and Infrastructure Systems, 195–202. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003323020-21.

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Huang, Junqi, Sushil Kumar e Jian-Guo Dai. "Flexural Behavior of Reinforced Concrete Sandwich Wall Panels Enabled by Fiber-Reinforced Polymer (FRP) Connectors". In Sandwich Composites, 147–66. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003143031-9.

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Dai, Jian-Guo, Sushil Kumar e Junqi Huang. "Axial Behavior of Reinforced Concrete Sandwich Wall Panels Enabled by Fiber-Reinforced Polymer (FRP) Connectors". In Sandwich Composites, 167–90. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003143031-10.

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Joo, Hyung Joong, Seung Sik Lee, Soon Jong Yoon, Ju Kyung Park e Seok Goo Youn. "Experimental Investigation on the Structural Behavior of Shear Connectors Used in the FRP and Concrete Bridge Deck System". In Fracture and Strength of Solids VI, 1355–60. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-989-x.1355.

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Xu, Guoping, Qingfei Huang, Shenyou Song, Hai Ji, Bin Deng e Tian Song. "Research on Mechanical Properties of Steel Shell Concrete Immersed Tube Shear Connectors". In Advances in Frontier Research on Engineering Structures, 295–312. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_27.

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AbstractStructural designs of shear connector in immersed tunnel is one of the most significant key technical problems in tunnel designing. According to investigations conducted in Shenzhong Link project, this paper combined numerical simulation methods and experimental verifications and to research effects of shear connector void, stress state, and opening holes on performances of steel–concrete connectors, and also discussed differences of shear slip curves under the influence of factors above, as well as impacts on bearing capacities and stiffnesses of connectors. Through numerical simulations of void and non-void connectors by finite element method, patterns of concrete stress, connector behaviors under tension and compression and shear stresses were analyzed respectively. Additionally, reductions of bearing capacity and stiffness caused by voids and openings which were controlled as variables were discussed. Furthermore, a calculation formula of shear connector bearing capacity is proposed which is in consistent with experimental verifications with considerations of void, stress state and opening. Researches in this paper could provide knowledge for reasonable structural designs of structural connectors in future immersed tunnel engineering construction.

Hassan, Rohana, Azmi Ibrahim e Zakiah Ahmad. "Structural Behaviour of Mortise and Tenon Joints". In Timber Connections, 25–42. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-2697-6_3.

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Williams, Diane L., e Carla A. Mazefsky. "Brain–Behavior Connections in Autism". In Learners on the Autism Spectrum, 39–54. 3^a ed. New York: Routledge, 2023. http://dx.doi.org/10.4324/9781003373193-5.

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Kalam, L., J. Dhanapal, S. Das e H. Ghaednia. "Behavior of Vectorbloc Beam-Column Connections". In Lecture Notes in Civil Engineering, 333–44. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-0507-0_31.

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Atti di convegni sul tema "Behavior of connectors":

Leemans, P., Q. Declerck, H. Grandjean, K. Daems, B. Hennuy e M. Vandenberg. "Thermal behavior of connectors in joints". In 22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013). Institution of Engineering and Technology, 2013. http://dx.doi.org/10.1049/cp.2013.1206.

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Perez, Marines, Carlos Alberto Bermudez e Tiziano Perea. "BEHAVIOR OF WELDED BOLT SHEAR CONNECTORS SUBJECTED TO REVERSED CYCLIC LOADING". In 2nd Croatian Conference on Earthquake Engineering. University of Zagreb Faculty of Civil Engineering, 2023. http://dx.doi.org/10.5592/co/2crocee.2023.91.

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Conventional bolts fillet-welded to steel and embedded in concrete have been a common method of force transfer between steel and concrete materials in composite construction in some Latin American countries. Welded bolt shear connectors have been used in both low-rise and mid-rise constructions replacing headed steel stud shear connectors. Whereas the installation of headed studs requires the use of a special high voltage equipment, welded bolts can be welded with fillet welds using shielded metal arc welding process more economically. Welded bolt shear connectors are also used in lateral load resisting composite systems. Natural cyclic loads from earthquakes cause connectors to be subjected to alternating shear forces. For this reason, the cyclic behavior of shear connectors is particularly important in these systems. In this study, a series of experimental tests on composite push-out specimens with welded bolt shear connectors were performed to investigate the behavior of shear connectors subjected to fully reversed cyclic loading. Of specific interest was the behavior under low-cycle fatigue. Results show up to 57 % reduction in connector shear capacity under reversed cyclic loading compared to static capacity.

Capelli, Francesca, Jordi-Roger Riba e David Gonzalez. "Thermal behavior of energy-efficient substation connectors". In 2016 10th International Conference on Compatibility, Power Electronics and Power Engineering (CPE-POWERENG). IEEE, 2016. http://dx.doi.org/10.1109/cpe.2016.7544167.

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Zandonini, Riccardo, e Oreste S. Bursi. "Cyclic Behavior of Headed Stud Shear Connectors". In Composite Construction in Steel and Concrete IV Conference 2000. Reston, VA: American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40616(281)41.

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Liu, Yong, Lanhui Guo e Zhiguo Li. "Flexural behavior of steel-concrete composite beams with U-shaped steel girders". In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7922.

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This paper focuses on a new type of steel-concrete composite beams consisting of U-shaped steel girders and angle connectors. Compared with conventional composite beams consisting of wide flange girders and headed stud connectors (or short channel connectors), the composite beams considered in this study have favorable flexural performance while reducing the excessive costs and potential construction challenges due to installation of the stud and/or channel shear connectors. Through four-point bending tests on five specimens, this research team experimentally investigated flexural behavior of such new composite beams. The five specimens were varied to have different angle connector intervals and installation locations. Test results showed that composite beams with angle connectors welded to the webs of U-shaped steel girder failed in brittle failure modes while composite beams with angle connectors welded on the top flange of U-shaped steel girder failed in ductile failure mode. Moreover, finite element analysis were performed and the results were verified by the experimental results. According to the parametric analysis results, concrete strength has little effect on flexural behavior of composite beams while increasing yield stress of steel girder could significantly increase the flexural resistance but could not change the initial stiffness. Increasing the height of steel girder, the thickness and width of bottom flange are recommended to improve the flexural behavior of composite beams.

Nakamori, Riko, Yuki Kageyama e Nozomu Baba. "Experimental Study on Behavior of Shear Connectors Embedded in Steel-Reinforced Concrete Joints". In 12th international conference on ‘Advances in Steel-Concrete Composite Structures’ - ASCCS 2018. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/asccs2018.2018.7124.

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This paper presents an experimental study on the behavior of shear connectors embedded in steel-reinforced concrete joints. In steel-reinforced concrete joints, the shear connectors are commonly used to transfer longitudinal shear forces across the steel-concrete interface. Further, in Japan, some studies in recently have also been undertaken to apply perfobond rib shear connector (PBL), which is a type of shear connectors developed in civil engineering, to the steel-reinforced concrete joints in building structures. To clarify the influence of the arrangement methods of headed studs and PBLs to reinforced concrete member on the joints, T-shaped subassembrages were tested under the monotonic tensil loading.This experiment is constituted of the following; Exp. I: Bond strength across the steel-concrete interface. Exp. II: Arrangement methods of these shear connectors to reinforced concrete member. The following can be drawn from the test results 1) The experimental values of the average maximum and residual bond strength are 0.230-0.280 and 0.15-0.18 N/mm2, respectively. 2) When the distance of between the upper surface of the reinforced concrete member from the first layer for headed studs are small, the failure mode of the specimens is similar to a concrete-cone type failure. 3) In case that the total number of headed studs or the hole provided to PBL is the same, the maximum load of the specimen with the parallel arrangement is larger than that of when shear connecters are vertically arranged. 4) The shear strength of headed studs in the joints embedded the steel member in the reinforced concrete member is estimated by superposing the average residual bond strength across the steel-concrete interface.

Zhang, Guoqing, e Meichai Zhang. "Experimental Research on Behavior of Angle Shear Connectors". In 2016 International Forum on Energy, Environment and Sustainable Development. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/ifeesd-16.2016.34.

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Feldmann, Markus, Oliver Hechler, Josef Hegger e Sabine Rauscher. "Fatigue Behavior of Shear Connectors in High Performance Concrete". In International Conference on Composite Construction in Steel and Concrete 2008. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41142(396)4.

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Zhao, He, Xin Nie, Dan Zhu e Mu-Xuan Tao. "Pullout Behavior of Steel Beam-Concrete Wall Pinned Joints with T- shaped Connectors". In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1747.

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<p>Nowadays, reinforced concrete core wall-steel frame hybrid structural systems are widely used in mid-rise and high-rise buildings. In this type of structural system, the pulling resistant behavior of the steel beam-concrete wall joints (SBCW joints for short) plays a very important role in the seismic behavior. In this study, the pullout behavior of a new type of SBCW pinned joints with T-shaped steel connectors is tested, and the load- displacement curves and failure modes of the specimens are analyzed. Two failure modes are observed in the experiments: one is punching shear failure mode characterized by the pullout of concrete pyramid with lower strength and stiffness, and the other is web yield failure mode characterized by the yield of the web plate of the connector with higher strength and stiffness. The key factor to determine the failure mode is the embedded depth of the connector. Additionally, finite element models for the SBCW joint are established and nonlinear elastic-plastic analysis is carried out, which can predict the failure modes and pulling resistant capacity of the specimens with good accuracy. Based on the numerical model, a parameter analysis is conducted to study the influence of more factors on the capacity of the SBCW joint.</p>

Wencong, Li. "Flexural Behavior of Composite Beam with I-Shaped Cross-Section Shear Connector". In IABSE Conference, Seoul 2020: Risk Intelligence of Infrastructures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2020. http://dx.doi.org/10.2749/seoul.2020.297.

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<p>In recent years, supertall buildings above a height of 450 meter have been built continuously in the world, especially in China and the Middle East. In order to meet structural performance of the supertall buildings, structural systems with excellent seismic performance and wind resistance performance are required. In the structural system, mega-column located at the building perimeter is a key structural member and it is expected to have large tensile, compressive, flexural, shear and torsional strength. Therefore, it is desirable that the steel and the concrete in the mega-column can be integrated tightly. In this study, I-shaped cross-section shear connector is proposed to prevent the slip between steel and concrete. Three-point flexural tests of a I-shaped cross-section steel and concrete composite beam specimen with I-shaped cross-section shear connectors and a conventional I-shaped cross-section steel and concrete composite beam specimen without I-shaped cross-section shear connector were carried out to investigate the effect of I-shaped cross-section shear connector on the inelastic behavior of a flexural member. The experimental results showed that the composite beam specimen with I-shaped cross-section shear connectors exhibited higher flexural strength and it is expected that the proposed I-shaped cross-section shear connector has a potential of being applied to the mega-column in the tomorrow’s supertall buildings.</p>

Rapporti di organizzazioni sul tema "Behavior of connectors":

Perez, Felipe de Jesus. Lateral Load Behavior and Design of Unbonded Post-tensioned Precast Concrete Walls with Ductile Vertical Joint Connectors. Precast/Prestressed Concrete Institute, 1998. http://dx.doi.org/10.15554/pci.rr.seis-018.

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Mahmood, Salih. Behavior of Lap Shear Connections with Thermally Insulating Filler Plates. Portland State University Library, gennaio 2000. http://dx.doi.org/10.15760/etd.6047.

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Porter, Joanne, Val Prokopiv, Blake Peck, Carolyn Bailey e Habib Forooshani. Adolescents Building Connections (ABC) Project Evaluation 2022. Federation University, dicembre 2023. http://dx.doi.org/10.35843/xacb5551.

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CERC (formally CERG) has evaluated the Quantum Support Services ABC program that provides tools and strategies to help young people understand the impact of their behaviours and encourage positive growth and maintenance of healthy relationships.

Canna, Tammy, e Mark Bowman. Fatigue Behavior of Beam Diaphragm Connections With Intermittent Fillet Welds, Part I, Volume 1, Field Evaluation. West Lafayette, IN: Purdue University, 2002. http://dx.doi.org/10.5703/1288284313222.

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Barth, Amy, e Mark Bowman. Fatigue Behavior of Beam Diaphragm Connections With Intermittent Fillet Welds, Part I, Volume 2, Laboratory Fatigue Evaluation. West Lafayette, IN: Purdue University, 2002. http://dx.doi.org/10.5703/1288284313223.

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Bewick, Bryan, Hani Salim e Brett Agee. Bending and Shear Interaction Behavior of Upgraded Conventional Cold-Formed Steel Connections to Protect Against Moderate Blast Events. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2011. http://dx.doi.org/10.21236/ada546934.

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Xu, Fei, e Tak-Ming Chan. STRUCTURAL BEHAVIOUR OF BLIND-BOLTED T-STUB TO OCTAGONAL TUBE CONNECTIONS USING NORMAL AND HIGH-STRENGTH STEELS. The Hong Kong Institute of Steel Construction, dicembre 2018. http://dx.doi.org/10.18057/icass2018.p.152.

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Jiang, Luli, Kim Rasmussen e Hao Zhang. EXPERIMENTAL INVESTIGATION OF FULL-RANGE ACTION-DEFORMATION BEHAVIOUR OF TOP-AND-SEAT ANGLE AND WEB ANGLE CONNECTIONS. The Hong Kong Institute of Steel Construction, dicembre 2018. http://dx.doi.org/10.18057/icass2018.p.174.

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Gao, Jun-Dong, Huan-Xin Yuan e Xin-Xi Du. NUMERICAL STUDY ON STRUCTURAL BEHAVIOUR OF STAINLESS STEEL BEAM-TO-COLUMN JOINTS WITH DOUBLE EXTENDED END-PLATE CONNECTIONS. The Hong Kong Institute of Steel Construction, dicembre 2018. http://dx.doi.org/10.18057/icass2018.p.157.

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Bowman, Mark. Fatigue Behavior of Beam Diaphragm Connections with Intermittent Fillet Welds: Part II, Brittle Fracture Examination of the I-64 Blue River Bridge. West Lafayette, IN: Purdue University, 2002. http://dx.doi.org/10.5703/1288284313224.

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