空间管桁架结构体育馆施工全过程模拟分析与健康监测

利用有限元软件ABAQUS中的生死单元法模拟空间管桁架结构施工过程的吊装阶段，把模拟得出的杆件应力与节点位移结果作为模拟施工过程卸载阶段的初始条件。利用支座位移法对卸载阶段进行模拟，同时对比了3种卸载方法，并将分级分步卸载方法的模拟数据与健康监测数据进行对比，验证了模拟方法的可行性。结果表明:以吊装阶段结果为初始条件的卸载过程模拟可以找出临时支撑上部在施工过程中受往复荷载的杆件，施工中应增强这部分杆件的加固措施；分级分步卸载可以防止结构杆件应力与节点位移变化过快，避免整体结构由此产生设计中未考虑到的动力响应；模拟结果与实际健康监测数据较为吻合，分级分步卸载为最佳的卸载方案，在实际工程中更为适用。

Whole Process Simulation Analysis and Health Monitoring of Spatial Pipe Truss Structure Gymnasium

The hoisting stage during construction process of spatial pipe truss structure was simulated by the birth and death element method in the finite element software ABAQUS. The simulation results of member bar stress and node displacement were used as the initial conditions for the unloading stage of simulation construction process. The unloading stage was simulated by the support displacement method. At the same time, the differences of the three unloading methods were compared. The feasibility of simulation method was verified by comparing the simulation data of the step by step unloading method with the health monitoring data. The results show that the simulation of unloading process with the hoisting stage results as initial conditions can be used to find out the member bars subjected to cyclic loading on the upper part of support in the construction process, and the strengthening measures of the member bars should be strengthened. The step by step unloading can prevent the stress of structural member bar and the displacement of node change too fast, and avoid the dynamic response of overall structure which is not taken into account in design. The simulation results agree well with the actual health monitoring data. The step by step unloading is the optimal unloading scheme which is more suitable for practical engineering.