钢框架结构不同支撑型式下的抗震性能研究

Seismic behavior comparison of steel frame structure support

为了研究支撑型式对钢结构抗侧移刚度的影响,分别建立不加支撑、加中心支撑和加单斜杆偏心支撑三种模型,利用SAP2000软件进行模态分析、反应谱分析和时程分析。通过采用Ritz向量法进行模态分析得出其自振周期,通过反应谱分析和时程分析发现:设置中心支撑和单斜杆偏心支撑的钢结构其位移和位移角明显减小;在相同位置加不同支撑对钢结构抗侧移能力影响不大;而且加支撑的钢结构能明显提高其抗侧移刚度和承载力,减小层间位移。

In order to reflect the influence of bracing on the lateral stiffness of stbracing without support, with central support and eccentric support with single slant bar artively. Modal analysis, response spectrum analysis and time history analysis are carried out by SAP 2000 soft-ware. The natural period was obtained through modal analysis using Ritz vector method. Rnalysis and time history analysis show that the displacements and displacement angles of steel structures withcentral support and eccentric slant eccentric support are significantly reduced than those without support;Adding different supports in the same position has a close impact on the anti - side - shift ability of the struc-ture. Reinforced steel structure can obviously improve its anti - side stiffness and bearing capacity, and the support can reduce the floor displacement.