【摘要】 基于QR法研究半刚性连接钢框架的稳定性,采用梁两端附带零长度转动弹簧的通用半刚性连接梁单元,通过转动弹簧和Kishi-Chen三参数模型来模拟梁柱半刚性连接的非线性力学性能,考虑二阶效应的影响,采用塑性铰模型及修正的Newton-Raphson迭代法,建立了平面钢框架二阶弹塑性稳定分析的QR法计算格式和步骤,并设计了相应的C++源程序,最后通过典型算例分析了半刚性连接钢框架的稳定性能,表明了该算法的优越性。更多还原

【Abstract】 Based on QR method,the stability of a steel semi-rigid frame was studied in this paper.A general semi-rigid beam element model with a zero-length rotational spring at both ends of the beam was used.The mechanical properties of semi-rigid connections were simulated by a rotational spring and a Kish-Chen three-parameter model.Considered the second-order effect,adopted a plastic hinge model and a modified Newton-Raphson iteration method,the calculation format and steps of QR method for the second-order elastic-plastic stability analysis of steel frames were constituted.Furthermore,the corresponding C++ source codes were designed.Finally,the stability of a typical steel frame was analyzed.The superiority of this method was showed.更多还原