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- 2018
屈曲约束支撑钢框架结构影响因素的静力弹塑性分析
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Abstract:
为检验抗侧刚度比和支撑布置方式等因素对具有不同总层数的屈曲约束支撑钢框架的抗震性能影响，借助SAP2000软件，探讨6层、12层、18层屈曲约束支撑钢框架结构在抗侧刚度比分别为1、2、3、4、5共五种工况及倒V型和单斜向两种支撑布置方式下的抗震性能。结果表明，屈曲约束支撑钢框架结构基底剪力-顶点位移曲线呈典型的双线性特征；随抗侧刚度比的增大，结构的层间位移角总体上呈降低趋势，基底剪力及支撑轴力增大，顶点水平位移变小，框架所分担的剪力降低；倒V型布置支撑较单斜向布置具有略大的基底剪力、谱加速度，较小的顶点位移、层位移、层间剪力和框架剪力分担率。分析表明，总体上来看，倒V型布置较单斜向布置时支撑框架结构具有略优的抗震性能；抗侧刚度比较支撑布置方式对支撑框架结构抗震性能的影响更为显著。
To test the influence of factors such as the lateral stiffness ratio and brace layout forms on the seismic behavior of buckling-restrained braced steel frames with different stories, the seismic performance of three buckling-restrained braced steel frame structures with six, twelve, and eighteen stories were analyzed with the SAP2000 software. The analytical structures have different lateral stiffness ratios with 1, 2, 3, 4, 5 and different brace layout forms with inverted V-shapes and monoclinic directions. The results show that base shear force-roof displacement curves of different buckling-restrained braced steel frame structures present typical bilinear relation. Furthermore, by increasing the lateral stiffness ratio, the story drift ratio of the structure, the roof horizontal displacement, and the shear force of the frame decreased, but the base shear force and the brace axial force increased. The structures with inverted V-shape braces had slightly larger base shear forces and spectral accelerations, but they had smaller roof horizontal displacements, story displacements, interstory shear forces, and shear-sharing ratios of frames than those of the structures with monoclinic layout braces. The analysis generally indicates that the structures with inverted V-shape braces have better seismic performance than the structure with monoclinic layout braces. Lastly, the results show that the lateral stiffness ratio has more significant influence on the seismic behavior of buckling-restrained braced frame structures than the brace layout forms.
