罕遇地震下不同基础埋深的某高层建筑结构的抗震性能分析

Seismic performance analysis of a high-rise building with different foundation depth in rare earthquake

防止结构在地震中不倒塌是抗震设防中最关键的一步,而基础埋深,为研究罕遇地震作用下不同基础埋深的某高层建筑结构的抗震性能,本文基于弹塑性有限元理论,利用Abaqus、etabs等软件建立有限元模型,分析结构基底剪力、顶点位移、层间位移角、顶点加速度指标对结构的影响,并比较两个不同模型结构底部弯矩、基础筏板应力分布情况,对罕遇地震作用下的剪力墙损伤分析进行了深入探究。结果表明:基底剪力会随着基础埋深的增大而减小,工程中可适当增加基础埋深深度以提高结构抗震性能;基础埋深对结构顶点位移、结构顶点加速度及结构底部弯矩的影响较大,对结构层间位移角的影响较小;基础埋深不足时,剪力墙容易破坏。研究成果可为类似工程提供参考。

Prevent structure not collapsed in the earthquake is the most crucial step in the seismic fortification,and embedded depth of foundation,as the research in view of the rarely met earthquake under the action of different embedded depth of foundation of a high-rise building structure seismic performance,based on the theory of elastic-plastic finite element,and etabs program software of Abaqus is used to establish the finite element model,the finite element analysis:(1)in article 7 under the action of seismic wave,the burial depth of the calculation and comparison of two different models in the bottom of the base shear structure under severe earthquake,vertex displacement,the interlayer displacement Angle,acceleration indicators such as structure,analysis of buried depth on the influence of the structure,and take corresponding measures.(2)calculate and compare the bottom bending moment and foundation raft stress distribution of two model structures with different foundation depths.(3)the damage analysis of shear wall of the structure under the action of rare earthquake was deeply explored to explore the impact of different foundation depth on the damage degree of basement shear wall,and put forward Suggestions and improvement measures.The results show that the base shear decreases with the increase of foundation depth,and the foundation depth can be appropriately increased to improve the seismic performance of the structure.The depth of foundation has great influence on the displacement of the structure vertex,the acceleration of the structure vertex and the bending moment at the bottom of the structure.Shear wall is easy to be destroyed when foundation is not deep enough.The research results can provide reference for similar projects.