灾害风荷载下温室单层柱面网壳整体动力倒塌分析

发布时间：2018-04-24 02:39

本文选题：温室 + 模型　；参考：《农业工程学报》2017年09期

【摘要】：该文针对大跨轻质单层柱面网壳在灾害强风天气下存在动力倒塌破坏的可能性,利用显式有限元分析软件ANSYS/S-DYNA及自编前后处理程序,综合考虑了几何非线性、材料非线性和接触非线性,建立了灾害风荷载下温室单层柱面网壳结构整体动力倒塌的数值分析模型,考察了单层柱面网壳的动力倒塌发展全过程。以节点位移和变形形态等几何特征响应对网壳结构进行了动力倒塌过程分析,将网壳结构倒塌过程依据其特性划分为轻度损伤阶段,倒塌形成阶段和整体倒塌阶段3个阶段;同时以杆件内力和截面塑性发展等力学特征响应对网壳结构进行了动力倒塌机理研究,指出网壳结构的风致动力倒塌原因是风压区压杆反复屈曲和拉杆依次失效相互作用的综合体现。对比分析考虑下部支承与不考虑下部支承单层柱面网壳的动力倒塌过程,结果表明,考虑下部支承柱时网壳结构动力倒塌对应的临界荷载系数发生了25%的明显降幅。该研究为温室网壳结构的抗风设计、工程应用和防灾评估提供了理论参考。
[Abstract]:In this paper, considering the possibility of dynamic collapse and failure of large span and light monolayer cylindrical latticed shells under the weather of disaster and strong wind, the geometric nonlinearity is considered synthetically by using explicit finite element analysis software ANSYS/S-DYNA and self-compiled pre-and post-processing program. The numerical analysis model of the dynamic collapse of single-layer cylindrical latticed shell structure under the disaster wind load is established, and the whole process of dynamic collapse development of single-layer cylindrical latticed shell is investigated. The dynamic collapse process of reticulated shell structure is analyzed by geometrical response of node displacement and deformation form. According to its characteristics, the collapse process of latticed shell structure is divided into three stages: mild damage stage, collapse formation stage and whole collapse stage. At the same time, the dynamic collapse mechanism of latticed shell structures is studied by using the mechanical characteristics such as the internal force of the member and the plastic development of the section. It is pointed out that the wind-induced dynamic collapse of latticed shell structure is a comprehensive reflection of the interaction between the repeated buckling of the compression bar in the wind pressure zone and the failure of the tension bar in turn. The dynamic collapse process of single-layer cylindrical latticed shell with and without lower support is analyzed by comparison. The results show that the critical load coefficient corresponding to the dynamic collapse of latticed shell structure with the lower supporting column is significantly reduced by 25%. The research provides a theoretical reference for the wind resistant design, engineering application and disaster prevention evaluation of the reticulated shell structure of greenhouse.
【作者单位】：河北农业大学城乡建设学院;
【基金】：建设部科学技术计划项目(2015-K2-028) 河北省科技计划重点基础研究项目(15965401D) 河北省高等学校科学研究项目(QN2015047) 河北省建设科学技术研究计划项目(2013-135)
【分类号】：TU312;TU399

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