【摘要】 在桥梁工程中,当需要限制梁端的碰撞或过大的相对位移,经常会在梁端设置液体粘滞阻尼器。由于技术原因,液体粘滞阻尼器在桥梁设计中的参数选取基本上是通过全桥模型的地震非线性时程分析得到的。而在寿命期内,桥梁需要承受各种随机荷载,在具有不同力学特性荷载的激励作用下引起梁端纵向大的响应时,液体粘滞阻尼器是否始终起有利的减震作用,一直困扰着其在桥梁工程中的实践。在液体粘滞阻尼器力学特性研究的基础上,通过矩阵变换得到关于阻尼器的局部动力方程,从变形和受力两个方向对此问题进行探讨,得到液体粘滞阻尼器对于梁端的相对位移、相对速度、相对加速度均有减震作用,但不会得出始终对所有构件的受力有利的结论,并进行了验证。更多还原

【Abstract】 The fluid viscous dampers are frequently equipped at the beam end for restricting pounding between adjacent component or larger beam end displacement of bridge.For technique hindrance,determining parameters for fluid viscous damper in bridge design is generally by nonlinear time history analysis of entire bridge model under earthquake.As bridge is requested to be subjected to various random loads which can arouse notable longitudinal response between beam ends during its life span,whether the damper always has advantageous effects on bridge or not becomes a question which puzzles the damper practice in bridge engineering.Relations between physical parameters itself and mechanics characteristics of fluid viscous damper are investigated at first.Secondly,local dynamic equations about fluid viscous damper under random loads are obtained by matrix transform.Finally,based on the above research,the question are investigated in two aspects: deformation and force.The results of advantageous effect of decreasing the relative displacement,velocity and acceleration all the time except force of structural components are found and verified.更多还原