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本文基于对广州国际会议展览中心张弦桁架屋盖的研究,用弹性模量的变化来模拟杆件损伤,利用概率设计方法研究了上弦平面内腹杆损伤对结构固有频率的影响。由于结构受到损伤时,各个杆件都可能受到损伤,并且损伤程度不能确定,本文定义损伤因子为[0,1]均匀分布,研究各杆件损伤对前十阶频率的影响。总结了对前十阶频率灵敏度影响较大的腹杆损伤及其分布规律,为张弦桁架及同类结构损伤评估和健康检测提供理论基础。
Based on the study of the truss roof of Guangzhou International Convention and Exhibition Center, this paper simulates the bar damage by the change of elastic modulus, and uses the probability design method to study the influence of the web damage on the natural frequency of the structure. When the structure is damaged, all the rods may be damaged, and the degree of damage can not be determined. In this paper, the damage factor is defined as [0,1], and the influence of each rod’s damage on the first ten frequencies is studied. The damage and distribution of the webs, which have a great influence on the sensitivity of the first ten orders, are summarized, providing a theoretical basis for the damage assessment and health monitoring of the stringed truss and similar structures.