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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。
The elasto-plastic numerical simulation of the large-span bridge system under seismic load involves four questions: 1) the rationality and convenience of establishing the integral model for the seabed (foundation) -post-piers-bridge; 2) the multi-point earthquake 3) the wave force and the hydrodynamic additional mass; 4) the viscoelastic artificial transmission boundary and its multiplicity after the infinite foundation is replaced by the finite-area foundation. First of all, the essential difference of the excitation input modes for the differential input model of the earth-structure system under the condition of the viscoelastic artificial transmission boundary is expounded and pointed out. Then, an effective earthquake differential with the spatial variation of the foundation position is proposed Based on which, the visualization program MEMS_c (Multiple Earthquake Motions Simulation_c) has been successfully developed. Based on the wave force and its spectral characteristics of small-scale structures, a wave force simulation (WFS) program has been developed. Finally, An intelligent and rapid modeling method of elastic artificial boundary conditions-foundation-pile-pier-structure integration is proposed and a visual modeling tool, Foundation V2013.6, is developed. The illustration is given. The content of this article has theoretical basis and practicality, which provides concrete preparation for directly following the project.