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大跨度单层空间网格结构冗余度小,对缺陷比较敏感,施工效应的影响大,某些关键杆件的失效极易引起结构连续性倒塌。基于能量平衡原理,考虑构件失效前结构的已有变形,建立了空间网格结构及构件的能量平衡方程,推导出结构抗力与构件抗力的关系式。根据单层空间网格结构的失效模式,构建结构抗连续性倒塌的子结构模型,分析大跨度单层空间网格结构的抗连续性倒塌机制,即梁机制、拉结机制、梁-拉结相关机制以及压杆机制,提出了相应机制下抗力需求的理论计算方法和抗力-位移曲线,并通过数值算例分析验证了所提方法的正确性。此外,对备用荷载路径法进行了修正,提出用于抗连续性倒塌分析的考虑施工效应的等效荷载卸载法,将该方法通过算例进行验证后应用于世界大学生运动会主体育场结构的抗倒塌分析中,结果表明该方法更加接近实际,结果更为可靠。单层空间网格结构的抗倒塌机制在杆件失效后的内力重分布过程中发挥重要作用,世界大学生运动会主体育场结构具有较好的抗连续性倒塌性能。
The long-span single-layer space grid structure has less redundancy, is more sensitive to defects and has a large effect on the construction effect. The failure of some key components can easily cause the structural continuity collapse. Based on the principle of energy balance, considering the existing deformation of the structure before failure, the space grid structure and the energy balance equation of the component are established, and the relation between structural resistance and component resistance is deduced. According to the failure mode of single-layer space grid structure, the sub-structure model with structurally continuous collapse is constructed, and the continuous collapse mechanism of long-span single-layer space lattice structure is analyzed, namely the beam mechanism, the pull mechanism, the beam- Related mechanism and strut mechanism, the theoretical calculation method and the resistance-displacement curve of the resistance demand under the corresponding mechanism are put forward, and the correctness of the proposed method is verified by numerical examples. In addition, the alternative load path method was modified, and the equivalent load unloading method considering construction effect for anti-continuous collapse analysis was proposed. The method was validated by an example and applied to the anti-collapse of the main stadium structure of the World University Games In the analysis, the results show that the method is more realistic and the result is more reliable. The anti-collapse mechanism of the monolayer space lattice structure plays an important role in the redistribution of internal forces after the failure of the rod. The structure of the main stadium of the World University Games has good anti-collapse performance.