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| Mechanical property of free form surface concrete structure |
| CUI Guo yong1, CUI Chang yu1,2, TU Gui gang1 |
| 1. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China; 2. Key Laboratory of StructuresDynamic Behavior and Control of China Ministry of Education, Harbin Institute of Technology, Harbin 150090, China |
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Abstract The finite element (FE) model of the free form surface concrete structure was built using the FE analysis software ABAQUS by rationally selecting the constitute relationship of the concrete in order to study the mechanical properties. The correctness of the FE model was verified compared with the related experiments. Then the distribution characteristic of the internal force of the typical free form surface structure, load displacement curves, failure mode and initial imperfection were investigated. Results show that the first principle membrane stress was tensile stress with high value in negative Gauss curvature region while it was tensile stress with small value in positive Gauss curvature region. The second principle membrane stress was compressive stress with high value in positive Gauss curvature region while it was compressive stress with small value in negative Gauss curvature region. The first principle stress of both the top and bottom surface has similar distribution mode. The ratio between bending and membrane internal force is higher in the transition region between the positive and negative Gauss curvature region than the rest region. The load displacement curve has no descent segment, meaning that the failure mode of the structure was strength failure. The initial imperfection has small influence on the structure. The mechanical analysis of two practical projects was performed to verify the correctness of the concluded mechanical properties.
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Published: 29 October 2015
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自由曲面混凝土结构力学特性
为了研究自由曲面混凝土结构的力学性能,合理选取混凝土材料本构方程,利用有限元分析软件ABAQUS,建立自由曲面混凝土结构的有限元分析模型,通过与相关试验的对比验证有限元模型的正确性.研究典型自由曲面结构的内力分布特性、荷载 位移曲线与破坏模式、初始缺陷.结果表明：薄膜第一主应力在负高斯曲率区受拉较大,正高斯曲率区受拉较小；薄膜第二主应力在正高斯曲率区受压较大,负高斯曲率区受压较小；上、下表面第一主应力分布模式类似；结构在正、负高斯曲率过渡区的弯曲内力与薄膜内力比值较大,其他位置很小；荷载 位移曲线没有下降段,结构破坏模式为强度破坏；结构对初始缺陷的影响很小.对2个实际工程进行力学分析,验证了所归纳力学特性的正确性.
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