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本文首先将高层支撑钢框架结构分解成纯框架和纯支撑体系两部分,并与一列受载铰接刚性杆并联,以考虑几何非线性的影响;然后将框架部分简化为半刚架,将支撑体系部分简化为铰接桁架,以此进行结构弹塑性地震反应分析.在前人试验和理论研究成果的基础上,本文还提出了能准确反映钢支撑主要滞回特征的支撑恢复力模型,便于工程实用.通过算例对比分析,表明采用本文提出的高层支撑钢框架简化模型进行弹塑性地震反应分析,具有计算精度高、计算自由度少、计算时间省的优点,是一种有效的近似方法.
This article first decomposes the high-rise support steel frame structure into two parts of the pure frame and the pure support system, and parallels with a load-bearing hinged rigid bar to consider the influence of geometric non-linearity; then the frame part is simplified to a semi-rigid frame and the support system Some parts are simplified into articulated trusses, and structural elasto-plastic seismic response analysis is carried out. Based on previous experiments and theoretical research results, this paper also proposes a support restoring force model that can accurately reflect the main hysteresis characteristics of steel braces, which is convenient for engineering practice. Through comparative analysis of examples, it is shown that the elasto-plastic seismic response analysis using the simplified model of the high-rise support steel frame proposed in this paper has the advantages of high calculation accuracy, less computational freedom, and less computation time. It is an effective approximation method.