【摘要】 为检测大跨度空间网格结构状况,对大跨度空间网格结构的节点损伤识别定位进行了研究,提出了适用于大跨度空间网格结构节点损伤识别的两步定位法.利用模态曲率变化比进行节点损伤的初定位,识别出损伤节点所在的子结构;以此子结构为研究对象,利用杆端应变模态变化比对节点损伤进行准确定位.以天津奥林匹克中心体育场屋盖结构为计算模型进行了节点损伤识别的定位模拟,结果表明,模态曲率变化比对节点损伤比较敏感,在节点发生较小程度损伤时便能将其所在的子结构准确地定位;杆端应变模态变化比能够准确地识别节点损伤的确切位置;从而验证了节点损伤两步定位法对大跨度空间网格结构的节点损伤识别定位的适用性和有效性.更多还原

【Abstract】 The identification and location of joint damage in long-span spatial structure were investigated and a two-step method applicable for them is proposed to detect the status of long-span spatial structure.Firstly,the change rate of the mode shape curvature was used in the initial location of the joint damage to detect the substructure with damaged joint.Then,in the detected substructure,the change rate of rod end modal strain was employed for the accurate location of joint damage.Also,the identification and location of joint damage in the roof structure of Tianjin Olympic Stadium was numerically simulated as an example.The analysis showed that the change rate of the mode shape curvature was much sensitive to the joint damage and was able to locate the accurate substructure for the occurrence of a slight joint damage;the change rate of rod end modal strain was much able to detect the accurate location of joint damage.Therefore,the applicability and the effectiveness of the two-step method used in the identification and location of joint damage in long-span spatial structure are verified.更多还原