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

(1)通过将水泥水化物与地基中的连通微孔复合，将传质、能量守恒、反应瞬态过程和运动变形等有机地结合起来，开发了地基土与结构物寿命评估仿真平台。通过考虑孔隙水压力和土颗粒群运动变形，将该体系进一步推广到液化土-结构相互作用问题。（2）研究了混凝土和土的持水性随温度的变化规律，建立了高精度的混凝土孔隙水瞬态水分平衡模型。探讨了高温下大尺度孔隙的快速释水问题，修正了以往的理论。同时，模拟了固化水合物中钙的溶出及其在天然地基上的吸附过程，考虑了热力学平衡的瞬态过程。（3）建立了宏观时变本构模型， ...更多信息 基于CSH凝胶和毛细管水的运动学方程，用分子动力学方法研究了CSH凝胶的蠕变和收缩随时间的变化。（4）随着裂缝的发展，腐蚀凝胶注入混凝土渐进裂缝的问题得到了解决。这使我们能够评估各种环境条件下保护层混凝土的使用寿命。（5）在动力振动台上模拟了快速液化条件下群桩与土的大非线性相互作用，得到了群桩的宏观和微观响应。土颗粒本构模型与钢筋混凝土多向开裂规律的耦合，被证明是一个强大的工具，具有合理的精度进行全面的模拟。(7)通过试验提取了混凝土结构高周疲劳的时变效应，建立了混凝土结构的通用疲劳仿真模型，并成功地将其应用于模拟整个结构系统长期性能的微尺度事件的直接路径积分方案中。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