【摘要】 跨海大跨桥梁体系在地震作用下的弹塑性数值模拟涉及四个问题:1)海床(地基)-桩-墩-桥建立整体模型的合理性便捷性;2)地下地基位置多点地震动反演途径的有效性;3)波浪力和水动附加质量;4)无限域地基被有限域地基代替后,粘弹性人工透射边界及其多源性。首先,阐述并指出了有无粘弹性人工透射边界下,土-结构体系地震差动输入模型的激励输入模式的本质区别;然后,提出了一种有效的地基位置具有空间变异性的地震差动反演途径,并据此成功开发了可视化程序MEMS_c(Multiple Earthquake Motions Simulation_c);进而,根据小尺度结构的波浪力及其频谱特性,开发了波浪力可视化计算程序WFS(Wave Force Simulation);最后,提出了弹性人工边界条件-地基-桩-墩-结构一体化的智能快速建模途径,并开发了可视化建模工具Foundation V2013.6,给出了图解说明。该文内容具有理论基础和实用性,为后续直接服务于工程提供了具体准备。更多还原

【Abstract】 Numerical studies on seismic responses of a long-span bridge pier-pile-soil system relate with the following several aspects: the reasonability and convenience of the finite element model for a long-span bridge pier-pile-soil system, the validity of approach for multi-point earthquake motions at underground locations, the wave force and effect of hydrodynamic pressures-induced added mass; and multi-source visco-elastic artificial boundary conditions. Firstly, the essential difference between the long-span bridge pier-pile-soil system with and without artificial boundary conditions is expounded and pointed out. Then, a feasible and effect path for the inversion of earthquake motions is given and proposed, accounting for spatial variability, at under-ground location from ground surface, and the corresponding visible program called MEMS_c(Multiple Earthquake Motions Simulation_c) is further developed successfully. Further, a visual program named WFS(Wave Force Simulation) is developed and illustrated based on the wave force and its spectral characteristics for small-scale structures. At last, in order to improve the efficiency and flexibility of preprocessor, a quick workflow for establishing numerical modeling is presented and the visual modeling tool Foundation 2013.6 is developed. The content involves theory and practicability. It can be directly applied to the follow-up engineering.更多还原