Long-term performance assessment platform of interacted soil-structure system based on multi-scale analysis

(1)通过将水泥水合物与地基微孔相连接，将传质、能量守恒、瞬态反应过程和运动变形整合在一起，建立了土体与结构物寿命评价模拟平台。考虑孔隙水压力和运动中土体颗粒组合的变形，将该体系进一步扩展到液化土-结构相互作用。(2)研究了混凝土和土体保水性能的温度依赖关系，建立了高精度的增强孔隙水瞬态水分平衡模型。探讨了高温条件下大型孔隙对截留水的快速释放，并对以往的理论进行了修正。同时，从热力学平衡的暂态角度模拟了硬化水合物中钙的浸出及其在天然土壤基础上的吸附。(3)基于CSH凝胶和毛细管水的运动学，建立了CSH凝胶的宏观时变本构模型，并用分子动力学方法研究了CSH凝胶的蠕变和收缩的时变特性。(4)随着裂缝的发展，腐蚀凝胶注入混凝土裂缝的问题得到了解决。这使我们能够评估覆盖混凝土在各种环境条件下的性能寿命。(5)在动力振动台的激励下，实验再现了群桩与土体在快速液化作用下的巨大非线性相互作用，并捕捉了群桩与土体的微观和宏观响应。验证了结合钢筋混凝土多向裂缝规律的土粒本构模型是整体模拟的有力工具，具有合理的精度。(7)通过实验提取了时间依赖性对高周疲劳的影响，建立了结构混凝土的通用疲劳模拟模型，并成功地将其应用于模拟整个结构体系长期性能的微尺度事件的直接路径积分方案。少

(1) Mass transfer, energy conservation, transient process of reaction and kinematic deformation are integrated by composing the linked micro-pores of soil foundation with cement hydrates, and the simulation platform for life-span evaluation of soil and structures was developed. This system was further extended to the liquefied soil-structure interaction by considering the pore water pressure and deformation of soil particle assembly in motion.(2)Temperature dependency of water retainability of concrete and soils was investigated, and the enhanced transient moisture equilibrium modeling of pore water was built with high accuracy. The rapid release of trapped water by large-scale pores at higher temperature was explored and past theorem was revised. At the same time, leaching of calcium from hardened hydrate and its adsorption by natural soil foundation was simulated with regard to the transient states of thermodynamic equilibrium.(3)Macroscopic time-dependent constitutive modeling was f … More ormulated based upon the kinematics of CSH gel and capillary water, and the time-dependent creep and shrinkage was investigated with molecular dynamics.(4)The injection of corroded gel into the concrete progressive cracks was solved with the crack development. This enables us to assess the performance life of cover concrete under various ambient conditions.(5)Great nonlinear interaction of group piles and soil was experimentally re-produced under rapid liquefaction excited by the dynamic shaking table and the micro and macro responses were captured. The soil particle constitutive modeling coupled with the multi-directional crack laws of reinforced concrete was verified as powerful tool of overall simulation with reasonable accuracy.(7) The effect of time-dependency on high cycle fatigue was experimentally extracted and the versatile fatigue simulation model of structural concrete was formulated, and successfully installed to the direct path-integral scheme of simulating the whole structural system with micro-scale events for a long-term performance. Less