parallel chord truss meaning in English

平行弦桁架
生代
梯形桁架

The optimized section area considering reliability is in some degree different from that without it , which can be applied in practice . the examples of three bar truss and parallel chord truss with biggish span are analyzed on the conditions of reliability or not , the results of which prove the model and method proposed in this paper are feasible
本文分别从考虑可靠度约束和不考虑可靠度约束的情况下对三杆桁架，和跨度较大的平行弦桁架进行算例分析；并将两种算法结果进行比较，结果证明本文模型与方法是可行的和现实的。