间接作用与材料延性对网架结构可靠性的影响

Indirect action and material ductility effects on reliability of space truss structure

结构在建造和使用的过程中,要承受各种直接作用和间接作用。基于最小势能原理推导了三维网架结构的冗余约束分量矩阵,将间接作用引入结构的可靠度计算中;同时,建立了有限延性材料在直接作用与间接作用共同影响下,以蒙特卡罗法来模拟结构体系可靠度的实现步骤。通过比较不同条件下结构的体系可靠度,表明考虑间接作用与材料延性对精确计算可靠度的意义。

In the course of construction and applying,structures experience all kinds of direct and indirect actions. Based on the principle of minimum potential energy,the redundancy component matrix of space truss structure is deduced and the indirect action is taken into account in reliability computation. Through Monte Carlo method,the implementation steps of system reliability simulation are established under the influences of both limited ductility material and direct or indirect actions. By analyzing structural reliability of systems under different conditions,it shows that the indirect actions and ductility play great role in reliability accurate calculation.