水平力下板柱结构等代梁等效宽度系数的研究

指出了水平力作用下板柱结构的等代梁应是变截面梁,与柱相交处的等代梁宽度比跨中的小;同时按刚度相等原则,给出了折算成等截面等代梁宽度的计算方法。提出了影响等代梁等效宽度系数的主要因素为受扭构件的抗扭刚度与板的抗弯刚度的比值,并通过弹性有限元分析,给出了以这个比值作为参数的板柱结构内框架和边框架等代梁等效宽度系数计算公式。

Study on Equivalent Width Coefficient of Equivalent Beam in Flat Plate Structures Under Horizontal Force

The width of the equivalent beam is the key question when flat plate structures are calcuated by the equivalent frame.It is pointed out that the equivalent beam is a differ-section beam,and the width of the equivalent beam of slabs intersected with the column is smaller than that of midspan slabs as flat plate structures under the horizontal force.The method for calculating the equal-section equivalent beam width is presented and the stiffness of the equivalent beam equals to the slab stiffness.Results show that the equivalent width coefficient is mainly influenced by the ratio of the torsional stiffness of the torsional member to the flexure stiffness of the slab.And calculating formulas of the equivalent width coefficient for the interior and the exterior frames of the flat plate structure are given by the elastic finite element analysis.