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
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.
CUI Guo yong, CUI Chang yu, TU Gui gang. Mechanical property of free form surface concrete structure. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2015, 49(10): 1960-1966.
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