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基于时变力学理论,讨论了施工过程模拟的力学原理和慢速时变结构基于时间冻结法和有限元生死单元技术的求解方法。采用观测层以下各层不施加重力加速度的方法模拟了施工过程中的找平措施,使得观测层的变形仅由其上各层的重力荷载和施工荷载引起,而不受其下各层累积变形的影响;同时各层的质量和刚度仍然计入总体结构的质量和刚度矩阵,满足了结构整体分析的要求。用三种不同的施工模拟方法对某典型的高层框架-核心筒结构进行了对比分析。结果表明,由于近似模拟施工方法考虑了施工找平措施的影响,计算结果比一次加载法更加接近施工过程的实际情况;同时,近似模拟施工方法的质量矩阵和刚度矩阵在整个模拟过程中只需组集一次,建模过程和计算所需工作量均远小于精确模拟施工方法。
Based on the theory of time-varying mechanics, the mechanics principle of construction process simulation and the solution method of slow time-varying structure based on time-freezing method and finite element unit of life and death are discussed. The method of applying no gravitational acceleration to the following layers in the observation layer was used to simulate the leveling measures in the construction process so that the deformation of the observation layer was caused only by the gravitational loads and construction loads of the upper layers but not by the accumulated deformation While the mass and stiffness of each layer are still included in the mass and stiffness matrix of the overall structure to meet the overall structural analysis requirements. A typical high-rise frame-core tube structure was compared and analyzed with three different construction simulation methods. The results show that the approximate simulation construction method considers the influence of construction leveling measures and the calculation results are closer to the actual construction process than the one-time loading method. In the meantime, the mass matrix and stiffness matrix of the approximate simulation construction method need only Once again, the modeling process and the computational workload are much less than the accurate simulation of construction methods.