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对任意荷载作用下无侧移的四杆封闭结构给出用分配系数和传递系数表示的精确解 .先求四杆封闭结构在任意荷载作用下的各杆的固端弯矩 ,然后求得结点不平衡力矩 ,从而将求任意荷载作用的问题转化为求任意的结点不平衡力矩作用的问题 .用弯矩分配法求解时 ,将杆端弯矩表示为无穷多次分配弯矩和传递变矩之和 ,其表达式为公比小于 1的无穷等比级数的和 ,可方便地求得该和的表达式 ,从而求得任意荷载作用下四杆封闭结构的精确解 .文中还给出了算例
For the four-bar closed structure with no lateral displacement under any load, the exact solution is given by the distribution coefficient and the transfer coefficient.Firstly, the fixed-end bending moment of each bar under any load is obtained first, and then the knot Point unbalanced moment, so that the problem of seeking arbitrary load action is transformed into the problem of arbitrary node unbalanced moment effect.When the moment distribution method is used to solve, the bending moment of the rod end is expressed as an infinitely many times distribution of bending moment and transmission The sum of the torques, whose expression is the sum of the infinite equal orders of which the common ratio is less than 1, can be easily obtained by the expression of the sum, so as to obtain the exact solution of a four-bar closed structure under any load. An example is given