Dynamic Reliability Analysis of Retaining Wall with Random Parameter Subjected to Seismic Activity
|School||Lanzhou University of Technology|
|Keywords||Retaining walls supporting Stability Reliability index Limit state equation Checking point method Response Surface Methodology The method of least squares|
Retaining structure as a structure, a wide range of its type, the applicable conditions depend on the location of the retaining terrain, engineering geological conditions, the use of hydrogeological conditions, building materials, retaining structures, construction methods, and technical and economic conditions and local engineering experience accumulated other factors. Gravity retaining wall supporting our country has long been widely used in the slope excavation support, and shows the superiority and adaptability. However, in the dynamic design analysis of gravity retaining wall supporting pseudo static method, without considering the physical mechanics of soil, retaining walls, and dynamic load indicators randomness, resulting in engineering some retaining wall structure estimated Quasi-static safety factor is enough, and was put into use quickly destroyed. Will take into account the parameters of randomness dynamic reliability analysis methods introduced in the design and analysis of the retaining wall supporting, can reduce a lot of damage occurred. For dynamic reliability introduced the design of the retaining wall supporting calculations, some scholars at home and abroad have done some work on the basis of previous work conducted a study of the following aspects: (1) analysis of the impact of retaining wall supporting dynamic reliability of random variables, soil internal friction angle, severe, cohesion, retaining walls elastic modulus, Poisson's ratio are significant follow a normal random variable; based on power reliability theory, the destruction of the retaining wall power to establish the performance function, and the use of structural reliability analysis the FOSM method of checking point method to calculate the reliability index of the failure mode. (2) very complex interaction between retaining walls and soil structure under earthquake is very difficult to determine the functions, so this article using the response surface method widely used to establish an implicit function of the retaining wall soil structure function explicit performance function fitting. (3) on the method of least squares regression coefficients in the performance function, and then get the structure of the limit state equation. (4) the use of programming software matlab programming for dynamic reliability, and ultimately the reliability index of the structure obtained by iteration. (5) specific examples of projects, the power structure under seismic action calculated reliability index, and then get the power of each node along the wall high reliability variation, thereby providing a reference for engineering design.