【摘要】 地震作用下渡槽梁体间的碰撞反应易对其抗震安全性产生重大影响。本文基于接触-摩擦理论,通过编制FORTRAN程序,建立了渡槽结构的三维动力分析模型,研究其在地震作用下的碰撞反应。结果表明,纵向地震输入是渡槽碰撞反应的控制工况;伸缩缝宽度增大,碰撞次数减少,但碰撞力峰值增大;渡槽的碰撞反应具有明显的地震动频谱敏感性,且随着槽内水深的增加而增大;碰撞会使梁端加速度反应明显增大,而使速度和位移反应趋于减弱;摩擦对渡槽纵向地震反应影响较弱,但对梁端横向位移反应和邻梁相对转角影响较大。更多还原

【Abstract】 Pounding response between two adjacent aqueduct girders is easy to pose a major threat to its seismic safety under strong earthquakes.By the aid of FORTRAN programs,a three-dimensional dynamic analysis model of the aqueduct structures is established to study the pounding responses under seismic actions based on contact-friction theories.Results show that the longitudinal seismic input is the control load of aqueduct structure’s pounding response.The increase of expansion joint width can greatly reduce the occurrence possibility of poundings and will significantly increase the peak pounding force.The aqueduct pounding responses have distinct spectrum sensitivity to seismic waves and increase with the increase of water depth.Pounding could make the beam end acceleration response increase significantly and tend to diminish the velocity and displacement responses.Friction has little effect on the longitudinal seismic response,but greatly influence the transverse displacement response and adjacent girders’relative rotation angle.更多还原