地下室不同约束条件下框-剪结构自振周期对比分析

Comparison analysis of natural vibration period of frame-shear wall structure under different constraint conditions

以江苏省某工程为背景,采用ABAQUS软件建立了三种实体模型进行模态分析,考察了带地下室的高层框架-剪力墙结构在不同边界约束条件下的自振周期与振型。比较分析表明,地下室回填土对此结构的自振周期影响很小,可以忽略;而是否将地下室顶板作为嵌固端则对自振周期影响很大。将分析结果与几种经验公式进行的比较表明,确定带地下室框架-剪力墙结构的自振周期时,考虑地下室与上部结构共同工作是比较符合实际的。

Based on a project in Jiangsu province, three different models are established respectively by using ABAQUS software. Modal analysis is carried out. Natural vibration period and oscillation mode of the high-rise frame-shear wall structure with basement under different constraint conditions are compared. The analytical results indicate that baekfilled soil has little effect on natural vibration period of the present structure. However, whether taking the top-floor of the basement as ~he fixed-end of the superstructure or not has considerable effect on natural vibration period. In addition, analytical results are compared with several empirical formulas. It is shown that considering basement-superstructure interaction for determination of natural vibration period of frame-shear wall structure with basement is in accord with actual condition.