Abstract
The structural damping ratio, structural quality, yield strength, and elastic modulus of section steel, compressive strength, elastic modulus of concrete, yield strength, and elastic modulus of steel bars play important roles in the stability of the steel-reinforced concrete (SRC) frame structure, which are usually uncertain. However, their importance influence on the different seismic demands of SRC is rarely investigated simultaneously. In order to investigate the effects of the above parameters on four seismic demands (i.e., the top displacement, the maximum floor acceleration, the base shear force, and the maximum interstory displacement angle) of SRC frame structures, the orthogonal polynomial estimation method is first applied to the importance analysis of structural seismic demand based on the moment-independent method. Two engineering examples are performed to verify the accuracy and efficiency of the proposed method. The results have the characteristics of fast convergence and are in good agreement with those obtained by the moment-independent method based on kernel density estimation. The variance importance index based on Monte Carlo (MC) method is also calculated for comparison. The influence of each random variable on the four structural seismic demands is basically the same. Therefore, the accuracy and efficiency of the proposed method are proved sufficiently.
Highlights
It is well known that the structural seismic requirement analysis plays an important role in seismic vulnerability analysis. ere are many research studies of structural seismic requirement analysis in recent years
It is worth noting that the Sobol sequence is applied to simulate the samples of random variables in this study, which is different from the ordinary Monte Carlo (MC) method. e results show that good convergence can be obtained even when the sample size is small. erefore, the proposed method in this study provides a new sampling method for the importance analysis and seismic analysis of the large-scale structures
Research studies show that the rocking-induced nonlinearities are inevitable in soil and soil-foundation interface, which will cause permanent deformations and damage the building, for the buildings adopting the shallow foundations, as it pointed out that the deep foundations are the most common solution for the problems caused by the rocking-induced nonlinearities
Summary
It is well known that the structural seismic requirement analysis plays an important role in seismic vulnerability analysis. ere are many research studies of structural seismic requirement analysis in recent years. Ere are many research studies of structural seismic requirement analysis in recent years. Seismic requirement is affected by many factors Speaking, they can be divided into two parts: the randomness of earthquake ground motion and the randomness of structural parameters. Existing studies have found that the randomness of earthquake ground motion has a great influence on the seismic requirement of structures. There are few researches which study the influence of the uncertainty of random variables on the structure seismic requirement. Erefore, it is necessary to focus on the stochastic variable with priority ranking ahead and ignore the random variable with priority ranking backward in the seismic requirement analysis of structures [4, 5], and the computational process is simplified, and the efficiency of calculation has been There are many parameters which impact the seismic requirement of the structure, while the degree of the influence is different. erefore, it is necessary to focus on the stochastic variable with priority ranking ahead and ignore the random variable with priority ranking backward in the seismic requirement analysis of structures [4, 5], and the computational process is simplified, and the efficiency of calculation has been
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
