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采用ANSYS有限元分析软件对于家堡交通枢纽站房“贝壳”形空间网壳结构的施工过程进行数值模拟,按照实际施工步骤,利用单元生死技术分析了结构关键杆件的应力变化过程,对提升工序进行了详细分析;为确保施工过程的安全,针对该结构中同时受到较大的轴力、剪力、弯矩及扭矩作用的的箱形截面构件,制定了专门的监测方案,将数值模拟位移结果与实际监测数据进行对比;利用非线性弹簧单元模拟了该工程支座的受力特性,基于该工程双支座的受力特征,重点研究了施工过程中支座位移的变化趋势。研究表明:由于施工顺序及温度的影响,各支座产生不同程度的位移,应采取措施加以固定;提升施工中提升点附近应力较大,卸载后残余应力较小;模拟结果与实际监测结果吻合较好,证明该施工模拟方法切实可行,施工过程中结构关键杆件应力及位移在可控范围之内,施工方案可以很好地满足施工要求。
The finite element analysis software ANSYS was used to simulate the construction process of the “Shells” space shell structure of Jiabao traffic hub station. According to the actual construction steps, the stress change process of the key components of the structure was analyzed by the means of unit life and death. In order to ensure the safety of the construction process, a special monitoring program was developed to deal with the box-shaped cross-section members with large axial force, shear force, bending moment and torque in the structure at the same time. The numerical simulation displacement results are compared with the actual monitoring data. The nonlinear spring element is used to simulate the bearing characteristics of this bearing. Based on the bearing characteristics of this bearing, the changing tendency of bearing displacement during construction is studied emphatically . The results show that due to the influence of construction sequence and temperature, the supports produce different degrees of displacement and should be taken to be fixed. The stress near the lifting point during construction is increased and the residual stress after unloading is small. The simulation results are in good agreement with the actual monitoring results It is better to prove that the construction simulation method is practical and feasible. The stress and displacement of the key components in the construction process are within the controllable range, and the construction scheme can well meet the construction requirements.