空间网架结构损伤程度识别的数值模拟与试验研究
Experiment and simulation analysis of damage of space truss

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 damage extents identification of members in space truss is an important part in health detection of space trusses. It plays a decisive role for the safety and applicability of truss structure. Based on the location of members damage, through experiment and simulation method, the analysis method of use transient dynamic response for the study about the damage extents identification of members in four pyramid space truss is put forward. The displacement-time history curve is educed about the different damage extents of members' node, and the curve-fitting analysis is made using Matlab. It shows that the displacement-time history curve of members' node can approximate synthesis of linear in different damage extents. Through the analysis abut slope of the line and the damage extents of members, it can educe the relation about the slope value, displacement-time history curve about top chord, bottom chord, wed member both ends of the node, and the damage extents of members. It can accurately identified the damage extents of four pyramid space truss members by the relation, which can be referenced in the damage extents identification of members in truss structure of practical engineering projects.