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为了考虑半刚性梁-柱连接的影响,对用于计算传统的无支撑的纯钢框架横向力分析的Muto方法进行了修正。运用第一定理,采用修正的Muto方法建立了这种钢框架层间位移的计算公式。通过比较精密的有限元程序计算出的结果可以看出,该方法给出了有侧移的半刚性连接纯钢框架比较精确的内力和层间位移的估计值。为了进行无支撑组合钢框架的手工分析,对修正后的Muto方法做了进一步改进,即用改良的等价的梁刚度来计算弯曲和下沉较大区域的梁刚度的变化。通过对半刚性连接无支撑组合框架严格的有限元分析,验证了这种简化分析方法的精确性。最后进行了参数研究,量化了半刚性连接对无支撑组合框架在侧向荷载作用下层间位移的影响。
In order to consider the influence of semi-rigid beam-column connection, the Muto method, which is used to calculate the lateral force analysis of traditional unsupported pure steel frame, is revised. Using the first theorem, the modified Muto method is used to establish the formula for calculating the displacement between layers of steel frame. It can be seen from the results calculated by the comparatively precise finite element program that the method gives more accurate estimates of internal forces and interlayer displacements for the steel frame with side-shifted semi-rigid connection. In order to do the manual analysis of the unsupported composite steel frame, the modified Muto method is further improved by using the modified equivalent beam stiffness to calculate the variation of beam stiffness in the bending and sinking large area. Through rigorous finite element analysis of the semi-rigid connection unsupported combination frame, the accuracy of this simplified analysis method is verified. Finally, the parametric study was carried out to quantify the influence of the semi-rigid connection on the displacement of the unsupported composite frame under lateral loads.