RC張出スラブの繰返し衝突を考慮した高架橋の地震時応答評価

摘要

Railway viaducts near stations, out of necessity, are arranged close to each other in the line transversal direction, in which case the two viaducts could collides with each other and be damaged. The aim of this paper is to establish an evaluation method of the seismic response of viaducts in consideration of repetitive collisions between RC overhanging slabs. As the result of a numerical approach, the single collision of RC overhanging slabs causes the reduction of the coefficient of restitution by about 0.2 due to the energy loss as the wave propagation in the superstructure, and by approximately 0 to 0.3 due to the energy loss as the nonlinear hysteresis of the material. The numerical simulation installed with the proposed contact model considering these effects shows that the seismic response of structures may increase by 70% due to the repetitive collisions.%本研究では，RC張出スラブの繰返し衝突を考慮した高架橋の地震時応答評価法を提案することを目的に数値解析を行い，以下の結論を得た。(1)張出スラブ相互の衝突により，衝突前の運動エネルギーの一部が材料の非線形化により損失される履歴エネルギー，上部工内に伝播する波動エネルギーに変換されることによりエネルギー損失が生じる。波動エネルギーヘの変換に伴い反発係数が0.2程度低下し，履歴エネルギーヘの変換に伴レ、反発係数がさらに，衝突速度，衝突角度に依存して0〜0.3程度低下する。