圆底球形组合肋壳连续化分析方法

发布时间：2019-05-27 23:27

【摘要】：圆底球形组合肋壳由U型截面组合肋和上部钢筋混凝土薄壳共同组成,能克服普通钢筋混凝土薄壳施工中支模拆模的复杂工序,整个结构具有施工简便、工程成本低廉、受力优越等特点.本文基于连续化理论,将组合肋壳中组合肋部分处理成正交各向异性薄壳,与上面钢筋混凝土薄壳构成具有协同工作的双层壳,按照弹性小挠度薄壳理论,建立组合肋壳位移法基本方程式,引入应力函数,推导出混合法基本方程式,并分别给出上层钢筋混凝土薄壳和下层组合肋网薄膜刚度矩阵、弯曲刚度矩阵以及考虑组合肋与钢筋混凝土薄壳间偏心的耦合矩阵具体表达式.最后,以40m跨圆底球形正交组合肋壳为例,将理论分析与有限单元法结果进行比较.研究表明:连续化分析能宏观地了解结构的力学性能,可用于组合肋壳结构的初步设计,为组合壳体类结构理论研究提供参考.
[Abstract]:The spherical composite ribbed shell with circular bottom is composed of U-shaped section composite ribs and upper reinforced concrete thin shell, which can overcome the complex process of mould removal in the construction of ordinary reinforced concrete thin shell. The whole structure has the advantages of simple construction and low engineering cost. Superior force and other characteristics. In this paper, based on the continuum theory, the composite ribs in the composite ribbed shells are treated as orthotropic thin shells, and the double-layer shells with cooperative work are formed with the reinforced concrete thin shells above. According to the elastic small deflection thin shell theory, The basic equation of composite ribbed shell displacement method is established, the stress function is introduced, the basic equation of mixing method is derived, and the thin film stiffness matrix of upper reinforced concrete thin shell and lower composite ribbed net is given respectively. The bending stiffness matrix and the coupling matrix considering the eccentric center between the composite ribs and the reinforced concrete thin shell. Finally, taking the 40m spherical orthogonal composite ribbed shell with circular bottom as an example, the theoretical analysis is compared with the results of the finite element method. The results show that the continuous analysis can understand the mechanical properties of the structure macroscopically, and can be used in the preliminary design of the composite ribbed shell structure, which provides a reference for the theoretical study of the composite shell structure.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金青年科学基金项目(51308443) 陕西省教育厅专项科研项目(15JK1384,16JK1443) 住房和城乡建设部科学技术计划项目(2016-K4-021)
【分类号】：TU398.9

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