Studies on Impact Behavior and Design Method of the Seismic Bridge Restrainers

公路桥梁减震器的设计荷载因设计理念的不同而有很大差异，可能是：（1）ROO<2>乘以主梁恒载（Rd）的一半。该设计荷载是基于1995年兵库县南部地震中发生的液化移动和倾斜桥墩或导致桥墩撞击另一桥墩的假设。(2)设计抗震系数（0.2）x恒载（2 Rd）=0.4Rd：引入该设计荷载是为了防止梁端在地震中从墩顶脱落。其他问题应从以下两个角度进行探讨：（i）防止桥梁倒塌的结构的三边效应，如漂移限制装置、梁端和墩顶的重叠长度，和桥梁防倒装置，（ii）在最坏的情况下，桥梁应该下降的梁连接装置上的冲击。本研究的目的是通过澄清桥梁的冲击响应特性来检查这两点。 ...更多信息 n作为桥梁防倒装置的地震耦合板，并通过重力场中的附着力响应分析获得设计力的基本参考数据。在该资助的第一个财政年度，该研究经费用于购买框架结构动力分析应用软件Dyna 2 e和冲击响应分析软件LS-DYNA 3D。为了解决上述问题，通过对桥墩-桥梁耦合系统的动力响应特性分析，对防坠桥结构的相互作用进行了初步研究。关于上述（ii），分析了原型模型在桥梁福尔斯倒塌时对梁连接装置的影响。然而，在这些研究完成之前，1995年发生了兵库县南部地震，这为直接观察沿海地震中桥墩和梁的真实的运动提供了良好的条件。使用地震获得的数据，为了研究桥梁倒塌可能对主梁连接装置产生的冲击响应，在上一财政年度进行了冲击响应分析。这项研究还开发了一种方法，使容易计算的动能使用几何条件，并考虑下降的刚性杆。因此，ROO <2>Rd方法，这是目前的设计方法之一，并讨论了更有效的设计方法，使用能量准则。少

The design load of seismic restrainer for a road bridge differs greatly depending on the design philosophy and may be either : (1) ROO<2> times a half of the dead load (Rd) of a girder. This design load is based on the assumption due to liquefaction moves and inclines the pier or causes the pier to hit another as occurred in the 1995 Hyogoken-Nanbu Earthquake. (2) the design seismic coefficient (0.2) x dead load (2Rd) =0.4Rd : This design load is introduced to prevent a girder end from falling off a pier top in an earthquake.The other subjects should be approached from the following two viewpoints : (i) Trilateral effects of the structures that prevent bridge fall, such as drift limiting devices, overlap length of girder end and pier top, and bridge-fall preventing devices, (ii) Impact on the girder coupling device in the worst case scenario that the bridge should fall.The purpose of the present study is to examine these two points by clarifying the impact response characteristics of a … More n seismic coupling plate used as a bridge-fall preventing device and obtaining fundamental reference data on the design forces using adynamic response analysis in a gravity field.In the first fiscal year of this grant, this research funds were used to purchase the application software Dyna2e for dynamic analysis of a framed structure and the impact response analysis software LS-DYNA3D.In an attempt to address (i) above, preliminary studies of the mutual effects of bridge-fall preventing structures were performed by dynamic analysis of the response characteristics of the pier-bridge girder coupling system. With respect to (ii) above, a prototype model was analyzed with respect to impact on a girder coupling device when a bridge falls.However, prior to the completion of these stdies, the 1995 Hyogoken-Nanbu Earthqake occurred, which provided a good qpportunilty to directly observe the real movement of piers and girders in an intracoastal earthqake.Using the data obtained from the earthquake, impact response analysis was performed last fiscal year in order to study the impact response that a bridge fall may produce on a girder coupling device. This study also developed a method that enables easy calculation of kinematic energy using geometric conditions and considering the drop of a rigid bar. Thus, the ROO<2>Rd method, which is one of the current design methods, and discussed more efficient design method using energy criteria. Less