大跨度单层空间网格结构抗连续性倒塌分析

发布时间：2018-07-13 18:40

【摘要】：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。
[Abstract]:The large span single-layer spatial grid structure has less redundancy, is sensitive to defects, and has a great influence on construction effect. The failure of some key members can easily cause the continuous collapse of the structure. Based on the principle of energy balance and considering the existing deformation of the structure before failure, the energy balance equations of the spatial grid structure and the component are established, and the relationship between the resistance of the structure and the resistance of the member is derived. According to the failure mode of single-layer spatial grid structure, the substructure model of anti-continuous collapse of single-layer spatial grid structure is constructed, and the anti-continuity collapse mechanism of large-span single-layer spatial grid structure is analyzed, that is, beam mechanism and tensile mechanism. A theoretical calculation method and a resistance-displacement curve of the resistance requirement under the corresponding mechanism are presented, and the correctness of the proposed method is verified by a numerical example. In addition, the alternative load path method is modified, and an equivalent load unloading method considering the construction effect is proposed for continuous collapse analysis. The method is applied to the collapse analysis of the main stadium structure of the Universiade through an example. The results show that the method is closer to the actual situation and the result is more reliable. The anti-collapse mechanism of single-layer spatial grid structure plays an important role in the redistribution of internal force after the failure of members. The structure of the main stadium of the Universiade has good anti-collapse performance.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金项目(51608433,51408623) 华南理工大学亚热带建筑科学国家重点实验室项目(2017ZB23)
【分类号】：TU399;TU312.3

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