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对看台事故的分析表明,节点损坏是导致结构整体倒塌的重要诱因之一。围绕苏州世乒赛装配式钢结构临时看台盘扣节点开展了研究。首先,介绍了该项目结构体系和盘扣节点的设计,进而考虑材料和接触的非线性,建立了盘扣节点的三维有限元模型;随后,针对衔接盘抗剪承载力、横杆连接节点抗拉(压)承载力和斜撑连接节点抗拉(压)承载力开展了非线性分析,获取了节点的屈服承载力,并将横杆节点承载力与文献已有试验结果进行了对比,验证了数值模拟方法的准确性;最后,对临时看台整体结构建立模型进行了设计荷载下的受力分析,并选取了其中一个9根杆件交汇节点,开展了设计荷载下盘扣节点复杂荷载情况下的非线性力学分析。结果表明:设计荷载下,结构横杆和斜撑最大轴力均在节点屈服承载力的范围内。同时,所分析的复杂受力节点基本处于弹性状态,所做研究可为类似临时看台的设计与建造提供参考。
The analysis of the stand accident shows that the node damage is one of the important inducing factors of the overall structural collapse. Around Suzhou World Championships fabricated steel structure temporary stand plate deduction node to carry out research. Firstly, the design of the structural system of the project and the design of the plate buckle node are introduced. Then the three-dimensional finite element model of the plate buckle node is established considering the nonlinearity of the material and the contact. Then, considering the shear capacity of the interface plate, (Pressure) bearing capacity and the tension (pressure) bearing capacity of the braced joints were analyzed. The yield capacity of the joints was obtained. The bearing capacity of the cross-bar joints was compared with the results of the existing tests The accuracy of the numerical simulation method is validated. Finally, the model of the temporary grandstand structure is analyzed under the designed load, and one of the nine joints is selected to carry out the complex load condition of the buckle node under design load Under the nonlinear mechanical analysis. The results show that under the design load, the maximum axial force of the structure bar and diagonal brace are within the range of the yield strength of the joints. At the same time, the analyzed complex stress nodes are basically in a state of elasticity, and the research can provide reference for the design and construction of similar temporary stands.