Improvement of Structural Safety against Near-Field Earthquake in Urban Areas

研究的目的是：(a)考虑到兵库县南部地震的强地面运动特征，调查建筑物、高架公路和桥梁、铁路立交桥的结构破坏原因；(b)研究地下结构（如神户市的地铁）遭受严重破坏的原因；(c)利用响应控制装置开发新的先进民用基础设施，并为具有重要作用的抗震结构建立新的设计。最终的研究成果包括：1. 薄壁钢桥墩的非弹性地震反应与损伤预测[j]。[2]考虑约束混凝土本构模型和简单剪切设计方程的构件力-挠度关系预测新数学模型。温度和应变速率对结构钢断裂韧性的影响；4 .橡胶减震装置预防桥梁失座的新方法及基础隔震系统橡胶叠合支座力学性能预测模型的建立。5 .楼板竖向竖向振动对R/C框架结构非线性结构响应的影响；开发了适用于地下结构的具有多向裂缝的钢筋混凝土结构动态非线性有限元程序。

The objectives of the research are (a) to investigate the cause of structural damage in buildings, elevated highway and bridges, railway overpasses, considering the characteristics of strong ground motion during the hyogo-Ken Nanbu Earthquake, (b) to study the cause of heavy damage in underground structures such as the subway in Kobe City and (c) to develop new advanced civil infra-facilities using response control devices and to establish a new design for earthquake resistant structures of important roles.The final research results includes ; 1. prediction of inelastic seismic response and damage of thin-walled steel bridge piers, 2. new mathematical model for predicting member force-deflection relation considering constitutive model developed for confined concrete as well as simple shear design equations, 3. effect of temperature and strain rate on fracture toughness of structural steel, 4. advanced unseating prevention of bridge by shock absorbing device made of rubber, and development of model predicting mechanical properties of rubber laminated bearing for base isolation system, 5. effect of vertical vibration of floor slab by vertical excitation on non-linear structural response of R/C frame structure, and 6. development of dynamic nonlinear FEM program dealing with R/C structures with multi-directional cracks applicable to under ground structure.