空间网架结构杆件的健壮性研究

Study on Robustness of Members in Space Truss

本文将空间网架结构杆件的健壮性定义为杆件的失效对结构整体受力性能的影响程度,通过杆件的健壮性影响系数来衡量,该系数包含了杆件自身材料利用率及对结构极限承载力影响两方面的综合因素。编制了网架结构极限分析的计算程序,利用程序对实例进行了极限承载力分析,计算出结构的极限承载力与各杆件的健壮性影响系数,并根据这些系数将所有杆件按照重要程度进行分类。设计师在进行杆件截面设计时,应给予那些健壮性影响系数比较低的杆件以足够的重视。

The robustness of space truss members refers to the degree of member failure influence on integral mechanical performance of structure. The influence can be measured by members＇ robustness influence coefficient, which includes two kinds of factors： material utilization of member and influence on structural ultimate loading capacity. The calculation program of ultimate analysis of truss structures is worked out to analyse the ultimate loading capacity on practical example, as well as to calculate the ultimate loading capacity of structure and the robustness influence coefficient of each member. Based on these coefficients, space truss members can be classified by importance. Designers should pay more attention to members with lower robustness influence coefficients, when they carry on members＇ sectional design.