四角锥系空间桁架的临界荷载

Critical Load of Quadrangular-Pyramid Space Truss

根据刚度等效的原理,将四角锥系空间桁架比拟为实腹梁,分析桁架的等效弯、扭刚度对其临界荷载的影响,导出桁架的临界荷载计算公式。多个典型实际算例的计算结果与有限元结果的误差在±5%以内,满足工程设计计算精度要求。

An analogy between quadrangular - pyramid space truss and solid - web girder can be made according to the theory of rigidity equivalent. The computing formula for the critical load of truss was derived by analyzing the effect of equivalent bending and torsional rigidity on the critical load. The deviation between computing results and finite element results of several real typical examples is in the range of negative five percent to positive five percent. It shows that the formula can satisfy the requirement of computing accuracy for engineering design.