基于截面最佳刚度分布钢框架结构抗震设计方法研究

发布时间：2018-06-06 21:19

本文选题：防灾减灾及防护工程 + 抗震设计　；参考：《工程抗震与加固改造》2015年06期

【摘要】：针对平面和竖向均规则、对称的钢框架结构,基于截面刚度最佳分布,提出一种抗震设计方法。首先,将钢框架结构简化为竖向悬臂杆,并设定其层间剪切变形角和弯曲变形角变化率在竖直方向上为定值,依据变形与内力的关系,确定截面刚度的最佳分布。其次,基于截面刚度最佳分布,通过分析截面刚度与截面尺寸之间的内在联系,确定计算单柱截面面积的方法 -比例法。为简化设计方法,借用6层、9层钢框架算例模型地震反应弹塑性时程分析结果,利用最小二乘法拟合确定钢框架柱截面面积和惯性矩最佳分布,并提出便于工程应用的抗震设计方法。然后,基于本文所提出的抗震设计方法建立10层算例模型,选取4条地震波对其进行地震响应弹塑性时程分析,结果表明各层弹性和塑性层间位移角分布均匀且符合抗震规范要求。最后,通过10层算例模型的层屈服剪力系数与最佳层屈服剪力系数的对比,验证了上述抗震设计方法的合理性与可行性。
[Abstract]:Based on the optimum distribution of cross-section stiffness, a seismic design method is proposed for symmetrical steel frame structures with plane and vertical uniform rules. Firstly, the steel frame structure is simplified as a vertical cantilever, and the shear deformation angle and the bending deformation angle change rate of the steel frame are fixed in the vertical direction. According to the relationship between deformation and internal force, the optimum distribution of section stiffness is determined. Secondly, based on the optimum distribution of cross-section stiffness, by analyzing the internal relationship between cross-section stiffness and cross-section size, the proportional method is determined to calculate the cross-section area of a single column. In order to simplify the design method, using the seismic response elastoplastic time history analysis results of the 6-story and 9-story steel frame model, the optimum distribution of section area and moment of inertia of steel frame column is determined by least square fitting. At the same time, the seismic design method is put forward, which is convenient for engineering application. Then, based on the seismic design method proposed in this paper, a 10-story model is established, and four seismic waves are selected to carry out the elastic-plastic time-history analysis of the seismic response. The results show that the displacement angles of elastic and plastic layers are uniform and accord with the requirements of seismic code. Finally, the rationality and feasibility of the above aseismic design method are verified by comparing the yield shear coefficient of the 10 story model with that of the best one.
【作者单位】：江苏科技大学土木工程与建筑学院;江苏科技大学(张家港)船舶与建筑工程学院;
【基金】：江苏省研究生科研创新计划项目(CXLX13_710) 江苏科技大学研究生科技创新计划项目(12508030054) 江苏省高校自然科学研究项目(14KJB560006)
【分类号】：TU352.11;TU391

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