摘要
为满足温度荷载引起的变形需求,连续梁桥一般一联只设置一个固定墩,地震作用下,固定墩承担几乎全部上部结构的纵向水平地震荷载,固定墩处于十分不利的受力状态。为了充分利用滑动墩的抗震潜力,协同固定墩抵抗地震作用,解决固定墩单独承受水平地震荷载的问题,提出一种构造简单、维护方便,以惯性力激活的减震装置(IFA装置)。基于某7跨连续梁桥,利用ANSYS软件建立有限元模型,阐述装置的工作原理,研究装置对等高与非等高连续梁桥减震性能的影响。研究结果表明,IFA装置发挥作用后,上部地震荷载将按刚度分配的原则传递至各滑动墩,实现滑动墩和固定墩的协同受载,可有效提高连续梁桥的整体抗震性能,但应用于非等高连续梁桥时需注意对矮墩的能力保护。
In order to meet the demand of deformation caused by temperature load, only one fixed pier is usually installed in the continuous beam bridge. Under the action of earthquake, the fixed pier bears almost all horizontal seismic load of the superstructure, and it is in a velT mffaw^rable stress state. In order to make lull use of the seismic potential of sliding piers in cooperation with the fixed pier to resist the earthquake action and to solve the problem that the fixed pier withstands the horizontal seismic load alone, a seismic absorption device （IFA device ） with simple structure, convenient maintenance and activation by inertial force is proposed. Based on a seven-span continuous beam bridge, the finite element model is established by using ANSYS software. The working principle of the device＇s seismic absolt^tion is elaborated and the i^flluenee of IFA device on the seismic absorption of the equal and non-equal high continuous beam bridges is researched. The research results show that when the IFA device works, the upper seismic load will be transmitted to the sliding piers according to the principle of stilt）less distribution. The synergistic loading of the sliding piers and the fixed pier can ett）etively improve the overall seismic absorption performanee of the continuous beam bridge. However, for non-equal high continuous beam bridge, attention should be paid to the protection of the short piers＇ ability.
作者
李锋
陈士通
马遥
史海东
LI Feng;CHEN Shi-tong;MA Yao;SHI Hai-dong(Hebei Engineering Research Center tor Traffic Emergency and Guarantee,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《铁道标准设计》
北大核心
2018年第12期57-60,74,共5页
Railway Standard Design
基金
国家自然科学基金(51678376
51778022)
关键词
连续梁桥
IFA装置
有限元分析
减震效果
Continuous beam bridge
IFA device
Finite element analysis
Seismic absorption effect
