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

桥梁抗震减震器冲击性能及设计方法研究

基本信息

批准号：
07650550
负责人：
NAGASHIMA Fumio
金额：
$ 1.47万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650550/
关键词：
seismic bridge reatrainer seismic coupling plate impact response analysis strain rate effects failure analysis Hyogoken-Nanbu Earthquake earthquake response analysis earthquake engineering 3次元衝撃応答解析耐震設計エネルギー吸収機構衝撃係数フラクチャー

项目摘要

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

公路桥梁抗震装置的设计荷载根据设计理念的不同而有很大差异，并且可以是： (1) ROO<2> 乘以梁的恒荷载(Rd)的一半。该设计荷载基于：假设由于液化而使桥墩移动并倾斜或导致桥墩撞到另一个桥墩，如 1995 年兵库县南部地震中发生的那样 (2) 设计地震系数 (0.2) x。静荷载 (2Rd) =0.4Rd ：引入此设计荷载是为了防止地震时梁端从桥墩顶部脱落。应从以下两个角度考虑其他问题： (i) 结构的三边效应防止桥梁倒塌的措施，如限位装置、梁端与墩顶搭接长度、防倒桥装置等；（ii）桥梁倒塌最坏情况下对梁连接装置的影响。目的目前的研究是通过澄清用作桥梁防倒装置的地震耦合板的冲击响应特性，并使用重力场中的动态响应分析获得设计力的基本参考数据，来检查这两点。在第一个财政年度本次研究经费用于购买用于框架结构动力分析的应用软件Dyna2e和冲击响应分析软件LS-DYNA3D。为了解决上述(i)问题，对桥梁相互影响进行了初步研究- 防坠落结构由桥墩-桥梁梁耦合系统响应特性的动态分析对于上述(ii)，我们对原型模型进行了桥梁倒塌时对梁耦合装置的影响分析。但是，在这些工作完成之前。研究发现，1995年发生的兵库县南部地震，为直接观测近海地震中桥墩、梁的真实运动提供了良好的契机。地震发生后，上一财年进行了冲击响应分析，以研究桥梁坠落可能对梁耦合装置产生的冲击响应。这项研究还开发了一种方法，可以使用几何条件并考虑跌落来轻松计算运动能。因此，作为当前设计方法之一的ROO 2 Rd方法讨论了使用Less能量准则的更有效的设计方法。