摘要
结构的动力特性直接影响到动力荷载的作用效应。动力特性分析中,土体的影响不可忽视。与地震荷载不同,动风荷载自结构向土体传播,土体的惯性力可以忽略。无质量地基法可以满足针对风荷载的土-结构动力分析的要求。本文首先推导土-结构动力相互作用的运动方程,在此基础上,以剪力墙箱型基础结构为基本分析对象,确定有限地基域的范围,分析土-结构整体动力特性。认为:足够的基础埋深,可以有效控制建筑物的摆动;为控制建筑物的动力特性,可以采取措施适当使地基土增加一定的刚度;如何在上部结构的质量和刚度之间建立对应关系以控制土-结构系统的动力特性,有待进一步研究。
The dynamic characteristics of structure directly affect the effect of dynamic load. The influence of soil cannot be neglected in the analysis of dynamic characteristics. Inconsistent with earthquake load, dynamic wind load transfer from the structure to the soil, so soil inertia forces can be ignored. Massless foundation method can meet the requirements of soil-structural dynamic characteristics analysis against wind load. First, the equation of soil-structural interaction motion was introduced. Second, the range of finite foundation soils was determined for shear wall struc- ture with box base. Finally, whole soil-structural dynamic characteristics were analyzed. It shows that adequate foundation depth can effectively control the swing of building. Increasing the stiffness of the soil can be used for controlling soil-structural dynamic characteristics. It would be further research work to establish relationship between the mass and stiffness of the upper struc- ture for controlling soil-structural dynamic characteristics.
出处
《防灾减灾工程学报》
CSCD
北大核心
2014年第1期28-33,共6页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学青年基金项目(51108124)资助
关键词
高层建筑
土-结构动力特性
有限地基
脉动风
动力荷载
high-rise building
soil-structural dynamic characteristics
finite foundation soils
fluctuating wind
dynamic load
