Seismic performance evaluation of underground reinforced concrete

基础与钢筋混凝土的边界特性：进行了桑迪与混凝土界面的平面剪切试验，成功地建立了考虑摩擦和粘结的边界界面单元。三维钢筋混凝土本构关系：采用路径相关本构模型处理多向裂纹问题，并将其转化为层三维Mindlin板有限元和实体钢筋混凝土格式。在三维空间箱形框架上施加偏心力，产生面内和面外耦合作用。抗震性能评价：以穿越软土地基、钢筋混凝土套管基础和钢筋混凝土框架地铁车站的U型地下道路隧道为研究对象，应用所开发的非线性动力分析软件进行了抗震性能评价。这些结果有助于起草JSCE关于抗震性能评估检查的建议。

Boundary characteristics of foundation and reinforced concrete : Plane shear test for interface between sandy soil and concrete was conducted and a boundary interface element to take into account friction and cohesive bond was successfully developed. Asensitivity analysis was carried out for boundary properties to dynamic response of underground structures.3D-RC constitutive law : Multi-directional cracks were numerically handled by the path-dependent constitutive model and implemented into layr 3D Mindlin plate finite element and solid RC scheme.Box-type shell under 3D cyclic actions : Eccentric force which creates coupled in-plane and out-of-plane actions was applied to the 3D space box frames. With this experimental data, the nonlinear FEM program developed was examined and verified.Seismic performance evaluation : Uunderground urban road tunnel passing through soft foundation, RC casing foundation and RC framed subway station were targeted, and developed nonlinear dynamic analysis was applied. These results served to draft the JSCE proposal on seismic performance evaluation check.