Tesis sobre el tema "Foundation scour"
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Kermani, Behnoud. "Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods". Master's thesis, Temple University Libraries, 2013. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/234113.
Texto completoM.S.C.E.
Proper design of bridge structures requires an appreciation for the possible failure mechanisms that can develop over the lifetime of the bridge, many of which are related to natural hazards. For example, scour is one of the most common causes of bridge failures. Scour occurs due to the erosion of soil and sediment within a channel with flowing water. During a flood event, the extent of scour can be so great that it can destabilize an existing bridge structure. In order to evaluate the scour potential of a bridge, it is necessary to have information regarding the substructure, particularly the bridge foundations. However, as of 2011 there are more than 40,000 bridges across United States with unknown foundations. Generally for these bridges there are no design or as-built plans available to show the type, depth, geometry, or materials incorporated into the foundations. Several non-destructive testing (NDT) methods have been developed to evaluate these unknown foundations. The primary objective of this research is to identify the most current and widely used NDT methods for determining the embedment depth of unknown bridge foundations and to compare these methods to an ultrasonic P-wave reflection imaging system. The ultrasonic P-wave reflection system has tremendous potential to provide more information and address several short-comings of other NDT methods. A laboratory study was initiated to explore various aspects related to the P-wave system performance, in order to characterize the limitations of the system in evaluation of unknown foundations prior to deployment in field studies. Moreover, field testing was performed using the P-wave system and a number of the current NDT methods at two selected bridge foundations to allow comparison between the results.
Temple University--Theses
Tavouktsoglou, N. S. "Scour and scour protection around offshore gravity based foundations". Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10044922/.
Texto completoHobson, Paul Myron. "Rheologic and flume erosion characteristics of georgia sediments from bridge foundations". Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26660.
Texto completoCommittee Chair: Sturm, Terry; Committee Member: Burns, Susan; Committee Member: Webster, Donald. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Pacheco, Gómez Rodolfo 1956. "CONTROLLING BRIDGE PIER SCOUR BY RIP-RAPPING". Thesis, The University of Arizona, 1987. http://hdl.handle.net/10150/276478.
Texto completoFlorkowski, Ronald W. "Evaluation of Unknown Foundations". Scholar Commons, 2007. http://scholarcommons.usf.edu/etd/3812.
Texto completoCollins, Carl. "Development and application of a computational model for scour around offshore wind turbine foundations". Thesis, University of Hull, 2017. http://hydra.hull.ac.uk/resources/hull:16530.
Texto completoMarei, Khaled Mohammed Said. "The stability of riprap for bridge abutments or embankments". Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276676.
Texto completoNavarro, Hernan Ricardo. "Flume Measurements of Erosion Characterstics of Soil at Bridge Foundations in Georgia". Thesis, Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/7267.
Texto completoMichalis, Panagiotis A. "Real-time monitoring of scour and sediment deposition evolution at bridges and offshore wind turbine foundations based on soil electromagnetic properties". Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25704.
Texto completoHesten, Peder. "Scour around wind turbine foundations, marine pipelines and short cylinders due to long-crested and short-crested nonlinear random waves plus currents". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15740.
Texto completoLu, Shou-Ji y 呂紹吉. "Dynamic Measuring Techniques of Levee Foundation Scour". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/27191142587329055987.
Texto completo逢甲大學
水利工程與資源保育學系
104
Recently, the extreme climate types occur frequently under the effect of climate change. The high intensity rainfalls usually concentrate during the summer typhoon seasons in Taiwan. In addition, rivers are steep with rapid flows in Taiwan due to the geographical reasons. The degradation of the riverbed may seriously affect the safety and stability of flood protection works such as levees. The riverbed elevation difference may be insignificant before and after a flood. However significant scour usually occurs around the flood peak near the levee foundation due to the high flow discharge per unit width, causing the failure of a levee foundation. Therefore, how to monitor the dynamic variation of riverbed during a typhoon event to prevent levee foundation destruction becomes a very important issue. The main objective of this study is to improve the measuring technique of levee foundation scour depth by using the “water and soil interface monitoring instrument”. It is hoped that the levee foundation scour depth measuring system and estimation formulas can be developed based on these field data and the analysis with SPSS software to serve as a reference of planning and designing for relevant engineers. A series of experiments were conducted in the laboratory and field for the “water and soil interface instrument” in order to assess the feasibility of the real time dynamic scour depth measurements. There are four major tasks in this test, including water level, riverbed elevation, water-proof, and wireless data transmission. The results show that the water level and riverbed elevation can be accurately detected under different types of flows in all the tests. In addition, the “water and soil interface instrument” is fully water-proof and wireless transmission data are stable and accurate. The field study area of this project is near the Ke-Zhuang levee of the Da-Jia River. The monitoring station of the real time dynamic scour depth was established by using the “water and soil interface instrument” and the wireless tracer brick columns. Furthermore, a levee foundation scour depth estimation formula is developed by using the traditional nonlinear regression analysis method with the observed field data. The accuracy of the results for the formula developed in this project is the best among all of the estimation formulas compared. As the observed data is still limited, more data should be collected during typhoons in the future for further verification.
Yi-ChunLin y 林怡君. "Identification of foundation scour depth using bridge natural frequencies". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/11555419750730909364.
Texto completo國立成功大學
土木工程學系碩博士班
101
Bridges have an important contribution to traffic, and most of bridges are across the river. However, typhoons every year could scour the foundation of bridges, and the bridge damages caused by foundation exposing in the rivers may create shortage of the foundation carrying capacity that bring bridge to collapse. There are many of dangerous bridges in Taiwan because of scour in rivers. Since the bridge foundation damage always underwater and cannot be observed directly, the bridge-monitor-system is made to find the bridge natural frequency and estimate the pile exposure level in this thesis. In the beginning, the bridge models for the several foundation scour depth with the different pier length, soil strengths and the different style of the pile foundations are created, then use three-dimensional continuous elements (called finite element analysis) and spring elements (called simple element analysis) to solve the soil-bridge problem and determine the bridge natural frequency . Afterward, the bridge natural frequency and the foundation scour depth interaction can be obtained to predict the exposure of pile foundation. Finally, comparing the simple element analysis and finite element analysis results indicates that the two methods obtain similar results.
Nguyen, Huong-Duong y 阮向陽. "EFFECTS OF DEBRIS AND SCOUR DEPTH ON PILE FOUNDATION BRIDGE". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/43468731119359781065.
Texto completo臺灣大學
土木工程學研究所
98
Typhoon Morakot (or typhoon No 8) of August 8, 2009, destroyed a total of 90 bridges around Taiwan. Water levels have traditionally been the sole criteria for bridge closure amid flooding in Taiwan., Under current guidelines, many bridges were not closed off before they collapsed this time. Take, for instance, the 2,083-meter Shuang Yuan Bridge, which was actually two separate bridges, one for each direction long of traffic. This bridge is expected in good conditions when the northbound bridge''s No. 2-15 piers and the southbound bridge''s No. 2-16 piers were washed away by raging currents. In current time, the velocity of water flow, the geological condition of each bridge needs to be considered. In this study, the capacity of Shuang Yuan Bridge was investigated under different levels of scoured depth. The pile axial capacity based on soil parameters, the bending, shear capacity and buckling instability of piles was analyzed. Scoured group pile foundations were modeled by Sap 2000. Debris load was also computed based on various water velocities, debris geometry and hydraulic parameters assumption. The pushover analysis is carried out with water and debris load to find the capacity curve of the bridge with different scoured depth, then the maximum applied floodwater force acting on a pier, and the performance water velocity is determined. The possible causes of Shuang Yuan Bridge failure are also pointed out.
Kuo, Huan-Wei y 郭桓瑋. "Numerical simulation of scour around foundation of offshore wind turbine". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/69f3b6.
Texto completo國立臺灣大學
應用力學研究所
105
In this study, we employ large eddy simulation (LES) along with ghost cell immersed boundary method (GCIBM) and arbitrary Lagrangian-Eulerian scheme (ALE) to simulate local scour induced by flow over a wall-mounted structure. In order to simulate the instantaneous evolution of the bed form, we use LES to resolve the detailed flow features. The GCIBM is used to model the geometry associated with the complex solid boundaries without much computational effort. Moreover, the ALE scheme incorporates the grid velocity such that the domain boundary is able to follow the time-dependent bed form geometry. The numerical study comprises four parts. The first part presents the steady current passing an idealized structure with the different shape. Our simulation results show that the sharp-nosed body effectively reduces the bed erosion. In the second part, simulations of the bed scour under field conditions are presented, by means of the law of similarity. The main erosion mechanism within the range of the field Keulegan-Carpenter number (KC) is due to lee-wake vortices. The third part considers the bed scour around a cylinder with the riprap protection. Results show that due to asymmetric motion of lee-wake vortices, scour is more vigorous at the left side of the riprap. The fourth part presents the simulation of scour during a long-wave period. When the wave period increases, the formation of horseshoe vortices around the cylinder is evident. As a result, the scour pattern is different from that in the small KC case. In the latter case, erosion mainly occurs at the left and right sides of the cylinder. In the former case, the scour hole forms around the cylinder, which appears to be a feature similar to the case of the steady current.
Jian-WeiLi y 李建緯. "Scour around the offshore wind turbine foundation with the composite protection". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/50450361433789004799.
Texto completo國立成功大學
水利及海洋工程學系碩博士班
101
This paper aims to study the use of experimental base of offshore wind turbine casing underwater influenced by waves and stream suffered erosion around the base case . And with the use of offshore aquaculture structures , Cage structure, on the surface facing the stream and wave , compare the difference of the surrounding base of the topography be scoured for cage. Test at National Cheng Kung University Hydraulics Laboratory plane tanks. First , the test carried out hydrodynamic tests discussing the different positions and length of cage netting, effecting of stream mitigation and reduction of wave height , find the optimum conditions for cage. Then fixed rule wave height and different wave periods, the experiments of wave attenuation were conducted. According to the above experimental results, two cases were taken the best cage condition to test for terrain erosion, and the situation of the topography scouring were investigated. According to wave attenuation and slow down on test results, after placed cages in facing wave side, the wave attenuation was little affect. When the cage is placed in facing stream surface, stream rate has been significantly decreased. under low stream rate , cage placement closer , netting the longer the length , the better the effect of slowing down the stream rate. Experimental results in terms movable bed for pure stream, it is found that in the absence of cages the erosion affect large regions are mainly located in the surface facing the stream. The greater the rate the greater the depth of maximum scour will be, the greater the impact of scour range and due to the base effect the flow field the larger the range of deposition will be. After using cages , each of the stream rate has improved maximum scour depth and greater depth range is reduced erosion and other effects. Due to the base and the cage effect the flow field and the formation of sediment range is larger than those without cages , especially under the high rate, the deposition ranges formed by the base and the cage effect is larger. In wave-current interaction system, the scour affect large regions are mainly located facing the wave side and the facing stream side. After using cages in facing the stream, has decreased maximum scour depth and range of larger scour depth on the base of the pile facing the stream ,and in the back wave side there are siltation because the stream field affected by cage resulting. When using cage facing the wave side and the stream side, the cage of facing the wave side the maximum scour depth and greater depth of scour range has also improved.
Wen-YenChou y 周文彥. "Investigation of the Relationship between Bridge Natural Frequencies and Foundation Scour Depth". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/91930059754228560280.
Texto completo國立成功大學
土木工程學系碩博士班
100
Most bridges in Taiwan are built across the river, so the stability of the bridge foundation is an important issue. As the bridge is burst, it may cause the damage for the human life, the interruption of the traffic, and the economic loss. When the typhoon invades, the bridge foundation may be scoured and cause the bridge collapse. Therefore, the bridge foundation scour depth can be applied to judge whether the bridge are in danger or not. However, it is difficult to measure the bridge foundation scour depth directly because most bridge foundations in Taiwan are under water, especially when the floods come. To overcome the problem, this thesis provides the bridge natural frequency to estimate the foundation scour depth. In the beginning, the bridge models for the various scour depths with the different soil strengths and the different style of the pile foundations are created, and the finite element method will be applied to determine the bridge natural frequency with the soil-bridge interaction problem. Then, the relationship between the bridge natural frequency and the foundation scour depth can be obtained to estimate the pile exposure level. Moreover, a general Gaussian function is applied to fit the curve of the frequency data. The formula of the curve fitting obtained in this study is acceptable to find the relationship between the bridge natural frequency and the foundation scour depth. A field experiment was performed in this thesis. By measuring the frequencies of the Sih-tsau Bridge, the random decrement method, Fast Fourier Transform method, and the Ibrahim time domain method are applied to identify the true natural frequency of the bridge.
Diau, Jikun y 刁繼堃. "Effect of Scour on Lateral Response of Deep Foundation for Bridge Pier". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/23064546844170611368.
Texto completo國立暨南國際大學
土木工程學系
101
The reduction in capacity and increase in deflection of the foundation system as a result of scouring are factors affecting safety of bridges encountering flood current. Understanding the effect of scour on lateral capacity of foundation is an essential element in addressing mitigation of this adverse effect. In this study, the effect of scour on a single pile is investigated systematically through results of model pile tests. It is founded that the reduction ratio R (of the lateral capacity) and the amplification ratio A (of the maximum bending moment) are useful indexes to quantify the scour effect. Effect of soil stiffness, pile slenderness ratio, and scour depth ratio on the value of R and A are examined. Simple yet rational correlations between R and scour depth ratio as well as A and scour depth ratio are established. Used of the developed correlation in design and disaster prevention also are discussed.
Fong-TingLin y 林奉廷. "Dynamic Behavior of Bridge Foundation under Scour-A case study on Shin-Fa Bridge". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/q7j7fa.
Texto completo國立成功大學
土木工程學系碩博士班
101
Due to the special geologically conditions, rivers in Taiwan are relatively short and steep. Therefore the foundations of the cross-river bridge are common suffered from scouring; foundations would be exposed and lose their bearing capacity; even collapse. Therefore, it is necessary to prevent the erosion of the foundation of the river in advance. However, the erosion usually occurred during typhoon attacked, it is difficult to observe the erosion condition under the condition of rainstorm just by visual eyes. Therefore, it is necessary to develop the instrument to measure the scouring and erosion condition during under the condition of rainstorm. In this study, the instruments were installed at the Shin-Fa bridge that located in Kaohsiung Liou-geui Distinct. The instruments were proposed to be monitored the long term characteristics of vibration and to evaluate stability of the bridge. Before long term monitoring, the initial conditions of the structures of the bridge which including geometric conditions, characteristics of bridge vibration obtained from field test were collected. Then the bridge model was established by the software that formulated by finite element method. Simulation of soil-structure interaction system was conducted by bridge modal analysis. Then calibration of the modal shape of the bridge by measuring the field vibration test. Finally three failure modes of the bridge foundation which including overturning, sliding and bearing capacity were checked by using limit equilibrium method. For considering the stability of the moment-resisting of bridge foundation under different flow velocities, water levels and the depths of scouring, the pushover analysis by using numerical model was performed. Based on the results of those analyses, an early warning system can be established and provide the reference as a policy for bridge closing during rainstorm and typhoon season.
Shen, Ming-Yi y 沈明毅. "Experimental Study on Developing Scour Fragility Curves- A Case Study of Bridge Pile Foundation". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/39579605510962554552.
Texto completo國立臺灣大學
土木工程學研究所
101
The escalating scale of natural disasters associated with global climate change and the growing world population increasingly threatens civil infrastructure. In particular, floods accelerate process of local scour around bridge piers resulting in damage to or failure of cross-water bridge structures. This study proposed a procedure for constructing scour fragility curves from flume experimental data for piled bridge pier. By a series of single-pile bridge pushover tests, the relationship between scour depth and capacity loss can be derived from the results. In addition, several flume experiments with a pier model scouring under controlled conditions were conducted and the scour process variation was observed. The scour depth observed from flume experiments were used to develop scour fragility curve which could be applied to evaluate the scour vulnerabilities of piled bridge pier for preliminary studies. A methodology to construct the scour fragility curve from flume experimental data was presented in this study; the main purpose of this paper is to show how the experimental data were used to build the scour fragility curves which are defined as a function of scour depth ratio or capacity loss ratio. The measured trend of the curves consists with the general scour process and the realistic behavior of piled bridge pier damage sequence. This paper has shown a feasible and practical methodology to construct the scour fragility curves from experiments.
Wei-ChenTseng y 曾韋禎. "Effect of Scour on the Dynamic Response of Offshore Wind Turbine with Monopile Foundation". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/345958.
Texto completo國立成功大學
土木工程學系
106
Severe foundation scour may occur around monopile foundations of offshore wind turbines due to currents and waves. The p–y curve method recommended in the current offshore foundation design codes does not account for the local scour around the pile foundation; it overestimates the lateral pile deformation and underestimates the foundation stiffness. This study presents a method to correct the initial modulus of subgrade reaction and modify the ultimate lateral resistance caused by the local scour. The natural frequency of the met mast structure is also determined by a numerical model and verified with the measured data in situ. A comprehensive parameter study is performed to analyze the effect of scour on the dynamic responses of the met mast. Furthermore, the scour exerted significant effects on certain modes of the vibration responses. The natural frequencies of the met mast structure can be reduced by approximately 14% due to scour, particularly in the horizontal bending modes. This study also provides a preliminary strategy for structural monitoring and analysis to detect scour damage on offshore wind turbines with monopile foundations. And the numerical model of the reference offshore wind turbine with monopile unprotected against scour at Chang-Bin offshore wind farm in Taiwan Strait is established. The results showed that when the p-y curve suggested by existing design regulation was used to calculate the load-deformation response, the foundation stiffness was underestimated where the scour depth was greater than the pile diameter, but the foundation stiffness was overestimated when the scour depth was less than the pile diameter.
CHANG, YI-HSIN y 張藝馨. "Local Scour aroung Nonuniform Piers and Pile Foundations". Thesis, 2000. http://ndltd.ncl.edu.tw/handle/44218843847065938388.
Texto completo國立中央大學
土木工程研究所
88
Most rivers in Taiwan are severely degrading during last two decades due to fast growing in-stream sand mining and construction of water supply or diversion works. Consequently, the exposure of bridge foundations, such as caissons and piles of bridge piers , is one of the most critical issue for the design and maintenance of river-crossing bridges. Inadequate design of countermeasures at bridge crossings may incur further local and contraction scours. The scouring process, such as maximum scour depth and scour dept and scour depth and scour range, around non-uniform piers and pile foundations are examined in this study by employing laboratory experiments . The suitable countermeasures for those foundations will is also investigated
Lin, Yunjie. "Scour effects on lateral behavior of pile foundations". Thesis, 2019. http://hdl.handle.net/1828/11123.
Texto completoGraduate
2020-08-19
Leão, Israel Neto dos Santos Ribeiro. "Reliability-based assessment of scour protections in offshore fixed foundations". Master's thesis, 2016. https://repositorio-aberto.up.pt/handle/10216/100388.
Texto completoLeão, Israel Neto dos Santos Ribeiro. "Reliability-based assessment of scour protections in offshore fixed foundations". Dissertação, 2016. https://repositorio-aberto.up.pt/handle/10216/100388.
Texto completoYao, Congpu. "LRFD Calibration of Bridge Foundations Subjected to Scour and Risk Analysis". Thesis, 2013. http://hdl.handle.net/1969.1/149453.
Texto completoFerradosa, Tiago João Fazeres Marques. "Reliability Analysis Applied to the Optimization of Dynamic Scour Protections for Offshore Windfarm Foundations". Doctoral thesis, 2018. https://hdl.handle.net/10216/115848.
Texto completoFerradosa, Tiago João Fazeres Marques. "Reliability Analysis Applied to the Optimization of Dynamic Scour Protections for Offshore Windfarm Foundations". Tese, 2018. https://hdl.handle.net/10216/115848.
Texto completoChang-KengWu y 吳長庚. "Effect of Scour Depth on The Deformation Response of Pile Foundations under Axial Loads". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/76502872198902311645.
Texto completoYousefpour, Negin. "Comparative Deterministic and Probabilistic Modeling in Geotechnics: Applications to Stabilization of Organic Soils, Determination of Unknown Foundations for Bridge Scour, and One-Dimensional Diffusion Processes". Thesis, 2013. http://hdl.handle.net/1969.1/151268.
Texto completo