楼梯间梯板斜撑作用对框架结构地震响应的影响研究

发布时间：2018-03-19 03:08

本文选题：楼梯　切入点：框架结构　出处：《华中科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：在传统的框架结构设计中，结构工程师习惯于把框架结构和楼梯分开进行设计，在楼梯处开洞，将竖向荷载传递到周边框架构件。但是在多次地震中，作为救生通道的楼梯间及其相关构件却往往遭受严重破坏，从而失去了其应有的作用。在框架承受地震荷载作用时，将楼梯与整体结构的相互作用考虑其中，不仅会使结构的局部刚度变大，而且对结构的自振特性、位移变形和受力情况都会产生较为明显的影响。为了研究楼梯构件对主体结构地震响应的影响，本文建立了两个框架模型。一个模型为传统设计模型，即在楼梯间处开洞，用来模拟不考虑楼梯的抗震作用；另一个为完整包含楼梯间构件的模型，来模拟楼梯参与框架结构抗震作用。用SAP2000软件对两个模型进行模态分析和反应谱分析，对模型的动力特性和地震响应的计算结果进行对比分析。研究结果表明：楼梯的加入增大框架结构的整体刚度，结构周期减小，亦使基底剪力有部分增大；楼梯的加入增大框架结构的抗侧刚度，结构的最大节点位移，，最大层间位移均有减小，是一种有利影响；楼梯在地震作用下的与框架结构的相互作用明显，受力情况发生了较为显著的变化。
[Abstract]:In the traditional frame structure design, the structural engineer is used to separate the frame structure from the staircase, open the hole in the staircase, transfer the vertical load to the surrounding frame member, but in many earthquakes, The stairwell and its related components are often severely damaged, thus losing its proper function. When the frame is subjected to earthquake load, considering the interaction between staircase and the whole structure, not only the local stiffness of the structure will be increased, but also the natural vibration characteristics of the structure will be increased. Displacement, deformation and stress will have a more obvious impact. In order to study the influence of staircase members on the seismic response of the main structure, two frame models are established in this paper. One is the traditional design model, that is, opening holes in the staircase, which is used to simulate the seismic action without considering the staircase. The other is a complete model which includes the components between stairs to simulate the seismic behavior of the frame structure. The modal analysis and response spectrum analysis of the two models are carried out with SAP2000 software. The dynamic characteristics of the model and the calculated results of seismic response are compared and analyzed. The results show that the addition of stairs increases the overall stiffness of the frame structure, reduces the period of the structure and partially increases the base shear force, and increases the lateral stiffness of the frame structure and the maximum node displacement of the frame structure with the addition of the staircase. The maximum interstory displacement is reduced, which is a favorable influence, and the interaction between the stair and the frame structure is obvious under earthquake, and the stress is changed obviously.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU311.3

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