超静定刚架和排架95

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,1、力法计算根本步骤,1确定超静定次数，解除多余约束代以多余约束力，建立力法根本体系。,2建立力法典型方程,3作单位力内力图和荷载内力图，计算柔度系数和自由项,4求解典型方程，得根本未知量,5根据叠加原理作内力图，并校核,7-3 超静定刚架和排架,2、超静定结构刚架举例,例1. 图a示一超静定刚架，试作出结构的内力图，,EI,为常数。,解：,1n=1，选择根本体系见图b,2建立力法典型方程,11X1 + 1P =0,3求系数、自由项,分别画出实际荷载及单位未知力X1 =1的作用的弯矩图图c、d，利用图乘法计算系数。,4 求多余未知力,5作内力图图e,由M图绘Q图，由Q图绘N图。,例2 计算图示结构内力，绘内力图,解：,1n=2，根本体系见图,原结构,2力法典型方程,3求系数、自由项,5绘内力图,排架结构力法计算根本步骤,5作内力图，并校核,1确定n，根本体系。,2建力法典型方程,3计算柔度系数和自由项,4求解典型方程，得根本未知量,例3 计算图示结构内力，绘内力图,1n=2，根本体系见图,根本体系,解：,2力法典型方程,这里的变形条件为：切口处两个截面沿轴向应仍然保持接触，即沿轴向的相对位移为零。,3求系数、自由项,4求根本未知量,5绘内力图,例4 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