考虑土-结构相互作用的框架结构抗震性能分析

Seismic performance analysis of frame structures considering soil-structure interaction

目前结构的抗震分析主要是采用刚性地基假定,忽略了土-结构相互作用,而在实际情况中结构的地震破坏与刚性地基假定的预期结果并不相同。为了对比差异,本文以一6层混凝土框架结构为例,分别进行了Pushover分析和非线性时程分析。结果表明:当考虑土-结构相互作用时,结构的基底剪力减小,周期增大,顶点位移增大且结构的破坏主要集中在首层,柱端出现了塑性铰,更符合实际的震害情况。并将Pushover分析与非线性时程分析的结果进行对比,验证了Pushover分析的可靠性。

At present,the seismic analysis of the structure is mainly based on the rigid foundation assumption,ignoring the soil-structure interaction,but in practice,the expected results of the seismic failure of the structure are not the same as those of the rigid foundation assumption. In order to compare the differences,this paper takes a six-story concrete frame structure as an example to carry out Pushover analysis and nonlinear time-history analysis respectively. The results show that when considering the soil-structure interaction,the base shear force of the structure decreases,the period increases,the vertex displacement increases,and the failure of the structure is mainly concentrated in the first floor,and the plastic hinge appears at the end of the column,which is more in line with the actual earthquake damage. The results of Pushover analysis and nonlinear time-history analysis are compared to verify the reliability of Pushover analysis.