摘要
为研究采用不同组合抗震措施时,在防止连续梁桥梁体碰撞和落梁方面的抗震效果,以2联5×30m预应力混凝土连续梁桥为背景,分别采用伸缩装置(无阻尼)、伸缩装置(有阻尼)、伸缩装置(有阻尼)+限位装置、伸缩装置(有阻尼)+限位装置+连梁装置作为抗震措施,运用有限元软件建立全桥模型,比较分析超越概率水平为63.2%、10%、2%的地震波下结构的地震响应。结果表明:对桥梁结构逐步增设有阻尼伸缩装置、限位装置及连梁装置,可有效减小桥梁结构在地震作用下的过大位移,防止相邻梁桥碰撞,同时能够提高结构整体刚度、合理分配地震荷载。
To study the seismic resistant effect of different combination of anti seismic meas ures on bridge, especially the effect on preventing beam collision and falling for continuous beam bridge, a prestressed concrete continuous beam bridge with two units of 5 × 30 m was taken as the study background. The anti seismic measures studied include the expansion device （without damp ing）, expansion device （with damping）, expansion device （with damping） plus restriction device, and expansion device （with damping） plus restriction device and beam linking device. The finite element software was used to establish the model of the overall bridge, to analyze the seismic response of the structure under the action of earthquake waves with exceedance probability of 63.2%, 10% and 2% respectively. The results of the analysis demonstrate that adding the expansion devices with damping, restriction devices and beam linking devices gradually to the bridge can effectively reduce the oversized displacement of the bridge structure under the action of earthquakes, prevent the collision of adjacent beams, and at the same time, enhance the overall stiffness of the structure and rationally distribute the earthquake loads.
作者
张煜敏
李宇
ZHANG Yu-min;LI Yu(Department of Civil Engineering,Mechanical Engineering College,Xi＇an Shiyou University Xi＇an 710065,China;Key Laboratory of Old Bridge Detection and Reinforcement Technology of Ministry of Transport,Chang＇an University,Xi＇an 710064,China)
出处
《世界桥梁》
北大核心
2018年第4期50-54,共5页
World Bridges
基金
国家自然科学基金(51408042)
陕西省交通运输厅科研项目(13-21K)
陕西省自然科学基础研究计划项目(2018JQ5073)
关键词
连续梁桥
抗震措施
伸缩装置
限位装置
连梁装置
位移
内力
有限元法
continuous beam bridge
anti-seismic measure
expansion device
restriction device
beam linking device
displacement
internal force
finite element method
