| The advantages of steel and concrete are combined in SRC spacial-shaped column frame. Its cross section is defined as the ratio of limb wide and limb thickness less than4, divided into+-shaped, T-shaped and L-shaped. The joints are the core parts of SRC special-shaped column frame. So better seismic performance is critical. The direction of the actual earthquake is arbitrary. According to survey of earthquake damage results, the joint destruction is far greater than expected.The experimental study on interior space joint in steel reinforced concrete spacial-shaped column frame with steel beams is completed in this text, which is belong to the National Natural Science Foundation project. On the experimental basis, seismic performance, failure mechanism and shear transfer law are analysed under oblique repeated loads. In the end, shear capacity of theoretical analysis and calculation and nonlinear static analysis of finite element are completed. The resluts of experiment and calculation are as follows:(1) Inclined pressure shear destruction takes place in the side of loading direction. But the front of the loading direction, bond failure between steel and concret happen in the area of joint due to bending affect of steel beams.(2) Hysteretic curves of specimens is plump and basic symmetry. Ductility, energy consumption of specimens is better. And its and damage accumulation are subject to axial compression ratio no significant effect. Due to greater axial compression ratio, the stiffness, strength of specimen J5are promoted obviously in the initial. But the lows of stiffness degradation and damage accumulation are same. The inffluence of loading angle between J2and J3is not obvious. But steel forms for all specimens have a greater impact. Layer displacement ductility factor and ductility factor of the displacement angle are between2.5to4, which shows well ductility.(3) Shear Capacity (cracking load, ultimate load) is analysed and calculated according to the experiment and stress mechanism of joints. The results show theoretical calculation of shear capacity model in agreement with the experimental.(4) In the end, nonlinear static analysis of test specimens is done by finite element software Abaqus. The satisfactory results are gained. The results indicate within certain reasonable boundaries, axial compression ratio benefit for the strength of specimens, but this superiority can decrease with the axial compression ratio increasing. Beyond a certain range of axial compression ratio, the strength of specimens no longer increases. In00to450range, the ultimate load of the specimens slightly descends as loading angle increasing. The ultimate bearing capacity and loading angle are approximately diamond-shaped distribution by fitting. So the weakest link of the specimens is not engineering-axis direction, but the project axis at an angle direction. |
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