Damage Evolution of Underground Structural Reinforced Concrete Small-Scale Static-Loading Experiments
Small-scale RC models of both piles and tunnel duct s were produced as mockups of reality and loaded under soil confinement conditionsto investigate the damage evolution of structural RC interacting with soil. Experimental v erifications usinga 3D nonlinear FE analysis program called COM3D, which was developed at the University of Tokyo, are introduce d. This analysis has been used in practice for seismic performance a ssessment of underground ducts and in-ground LNG storage tanks in consideration of soil-structure interactionunder static and dynam ic loading. Varying modes of failure of RCpilessubjected to different m agnitudes of soil confinement were successfully reproduced in the proposed small-scale experiments and numerically simulated as well. Analytical simulation was applied to RC tunnel mockups under a wide variety of depth and soil confinement conditions, and reasonable matchin g was confirmed.
Numerical Investigation on Damage Evolution of Piles inside Liquefied Soil Foundation - Dynamic-Loading Experiments -
The large and small-scale shaking table tests, which was conducted for investigating damage evolution of piles inside liquefied soil, are numerically simulated and experimental verified by the3D nonlinear finite element analysis. Damage evolution of elasto-plastic circular steel piles and reinforced concrete (RC) one with cracking and yield of reinforcement are focused on, and the failure patterns and residual damages are captured by the proposed constitutive models. The superstructure excitation behind quay wall is reproduced as well. Keywords—Soil-Structure Interaction, Piles, Soil Liquefaction.
FAILURE ANALYSIS OF UNDERGROUND RC FRAME SUBJECTED TO SEISMIC ACTIONS
本研究は地中鉄筋コンクリート構造の破壊解析を提示し, 経路依存性を考慮した材料構成モデルに基づき, 地中構造の破壊機構について論ずるものである. 考慮した非線形性は鉄筋コンクリート, 地盤材料および地盤構造間の応力伝達機構である. 主として鉛直荷重を支える部材のせん断破壊に着目し, 破壊に及ぼす地盤の非線形性, 地震入力の違い及び鉛直成分の有無について検討を行った. 保有する耐震性能は地盤と構造自体の非線形性を共に考慮しなければならないことが確認された.