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空间网架杆件的损伤程度识别是网架结构健康检测中十分重要的环节,对网架结构的安全性和适用性起到决定性作用。在定位损伤杆件的前提下,通过模型试验和数值模拟手段,提出应用瞬态响应动力分析方法对四角锥网架杆件进行损伤程度识别,获得不同损伤程度杆件两端节点的位移时间历程曲线,应用Matlab对该曲线进行拟合分析。结果表明:在不同损伤工况下,损伤杆件两端节点的位移时间历程曲线可以近似拟合成直线,通过对该直线的斜率与杆件损伤程度的分析,分别得到上弦杆件、腹杆、下弦杆件两端节点的位移时间历程直线的斜率值与杆件损伤程度的关系式,通过该关系式可以较准确的识别出四角锥网架杆件的损伤程度。
The identification of the damage degree of the space grid member is a very important link in the health inspection of the grid structure and plays a decisive role in the safety and suitability of the grid structure. Based on the model test and numerical simulation, the transient response dynamic analysis method is proposed to identify the damage degree of tetragonal pyramidal grid members and obtain the displacement time history of the nodes with different degrees of damage Curve, using Matlab to fit the curve analysis. The results show that under different damage conditions, the displacement time curves of the two ends of the damaged rod can be approximately fitted to a straight line. By analyzing the slope of the straight line and the degree of damage of the rod, , And the relationship between the slope value of the straight line and the degree of damage of the bars by the displacement time histories of the nodes at both ends of the lower chord member. By this relation, the degree of damage of the quadrangular pyramid grid members can be more accurately identified.