老山奥运会自行车馆在多维多点输入下的响应分析和可靠度分析  

Dynamic Behaviors and Reliability of Laoshan Bicycle-Gymnasium for the Olympic Games Under Multi-Dimensional and Multi-Support Xxcitation

作　　者：叶继红[1] 白学丽[1] 

机构地区：[1]东南大学,南京210096

出　　处：《应用力学学报》2008年第2期336-341,共6页Chinese Journal of Applied Mechanics

基　　金：国家自然基金(50108003)

摘　　要：考虑地震动两个水平分量和一个竖向分量,同时考虑了地震动场的空间相关性,用时程分析法对老山奥运会自行车场馆进行了多维多点输入和多维一致输入下的动力响应分析,考查了两种输入方法下结构响应的差异以及视波速对这种差异的影响。另一方面,本文在快速多点输入反应谱法的基础上,对老山奥运会自行车场馆进行了多维多点输入和多维一致输入下的构件层面上的抗震可靠度分析,考查了两种输入方法下危险杆件在结构分布、数量等方面的差异以及危险杆件随视波速的变化关系。得出以下结论:采用地震动的多点输入法,导致整个结构的内力分布更加均匀;两种输入方法下,杆件内力可靠指标明显降低的杆件有相当一部分位于支承附近区域;会产生一定数量的"一致输入下安全而多点输入下危险"的杆件,且它们大多分布于支承区域附近。The dynamic behaviors of Laoshan bicycle-gymnasium for the Olympic games subjected to multi-dimensional and multi-support excitation, as well as to multi-dimensional and simple-support excitation are thoroughly analyzed with time history method. The characteristic of the distribution of member forces under these two kinds of input modes is investigated. The effects of the apparent wave velocity on these differences are also suggested. On the other hand, the aseismic reliability of Laoshan bicycle-gymnasium subjected to multi-dimensional and multi-support excitation, as well as to multi-dimensional and simple-support excitation are also studied with the fast multi-support response spectrum method. The aseismic reliability obtained by the multiple support excitation is compared with the results by simple support excitation, such as the difference in the distribution and the amount of dangerous members. The relationship between the dangerous members and the apparent velocity is discussed. It is found (1) the internal force is more uniformity under multiple support excitation; (2) comparing the two input modes, most of the members whose reliability indexes decrease sufficiently are near the supports; (3) a few members of long-span space structure become dangerous under multi-support excitation while they are safe under simple-support excitation.

关 键 词：空间网格结构 地震响应 可靠度分析 多维多点输入 多维一致输入 

分 类 号：TU311[建筑科学—结构工程]