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对具有不同升降高度、升降机数量和杰克延性的3+3支撑系统的足尺试验进行数值模拟,分析支撑系统性能。介绍了模拟栓接节点、半刚性梁连接及底板偏心的方法。基于Ramberg-Osgood方程,考虑材料非线性,并考虑了轴线不直、表面与轴线不垂直等初始几何缺陷。通过足尺试验得到的破坏荷载和荷载-位移曲线,对非线性分析得到的极限荷载进行修正。数值结果与试验很吻合,表明采用几何非线性和材料非线性分析能很好地研究支撑系统的性能和极限承载力。分析了支撑系统模拟中的一些难题,建立了底板、U型头、栓接节点的力学模型。
The full scale test of 3 + 3 support system with different lifting height, number of lift and Jack ductility was carried out to analyze the performance of support system. The methods of simulating bolted joint, semi-rigid beam connection and floor eccentricity are introduced. Based on the Ramberg-Osgood equation, the material nonlinearity is considered, and the initial geometric defects such as the axis is not straight, the surface is not perpendicular to the axis, etc. are considered. Based on the failure load and load-displacement curve obtained by full-scale test, the ultimate load obtained by nonlinear analysis is corrected. The numerical results are in good agreement with the experimental results, indicating that the performance and ultimate bearing capacity of the supporting system can be well studied by using geometric nonlinearity and material nonlinear analysis. Some difficulties in the simulation of support system are analyzed, and the mechanical model of bottom plate, U-shaped head and bolted joint are established.