论文部分内容阅读
GB 50011—2010《建筑抗震设计规范》要求对于平面投影尺度很大的空间结构,应进行多点输入地震反应分析。在多点输入地震反应分析的主要方法中,时程分析法的应用最为广泛。在确定多点输入地震波时,主要考虑行波效应和局部场地条件效应。多点输入时程分析在有限元分析程序中的实现方法主要有两种,一是对各支座点施加强制边界条件,二是采用大质量法。据此,提出以超载单元和超载比作为多点输入对结构影响的主要评价指标,并根据多个实际工程多点输入分析的经验,给出了多点输入的一般性结论:多点输入将增加结构的扭转输入,因此对于边角构件的影响较大;多点输入降低输入的同步性,因此结构平动反应减小;在一定视波速范围内,多点输入影响随着视波速的减小逐渐增加;多点输入的影响随着楼层的增高而减小等。
GB 50011-2010 “Code for Design of Seismic Design of Buildings” Requirement For seismic structures with large scale of plane projection, multi-point input seismic response analysis should be carried out. Among the main methods of multi-point seismic response analysis, time-history analysis is the most widely used method. In the determination of multi-point input seismic wave, the main consideration is the traveling wave effect and local site conditions. There are mainly two methods to realize multi-point input time-history analysis in finite element analysis program. One is to impose forced boundary conditions on each support point, and the other is to adopt mass method. Based on this, the main evaluation index of the influence of overloading unit and overloading ratio on multi-point input is put forward. Based on the experience of many multi-point input analysis of actual project, the general conclusion of multi-point input is given: So the structure’s torsional input is increased, so the influence on the corner components is larger. The multi-point input reduces the synchronization of the input and thus the translational response of the structure decreases. In a certain range of apparent wave speed, Small gradually increased; the impact of multi-point input decreases with the increase of the floor and so on.