摘要
针对目前桥梁结构横向防落梁限位装置损毁后修复困难的问题,提出一种新型的带可更换耗能段的桥梁横向防落梁限位装置。分别以可更换耗能段的腹板厚度、腹板高度及安装位置等为参数,采用有限元软件ABAQUS建立了10个不同参数的装置模型并对其开展拟静力仿真试验,探讨其工作机理,验证其可更换的设计思想并剖析其破坏机理,研究各参数对装置滞回曲线、承载力、延性和耗能能力的影响规律。结果表明:该装置可通过先可更换耗能段破坏再竖板破坏达到多道设防和分级耗能的目的,且整个加载过程中装置的滞回曲线饱满、稳定、无明显捏拢,表现出良好的耗能能力;随着可更换耗能段腹板厚度的增加,装置屈服承载力、极限承载力、屈服位移、极限位移以及延性系数逐渐增大,耗能能力逐渐增强;可更换耗能段高度对装置屈服承载力影响不显著;随着可更换耗能段高度的增加,装置极限承载力逐渐增大,装置屈服位移先增大后减小,装置极限位移整体呈下降趋势,装置的延性系数和耗能能力逐渐减小;可更换耗能段的安装高度对装置屈服承载力和耗能能力的影响无统一规律,但与装置的屈服位移、极限位移及延性系数成负相关。基于本析结果,建议装置在满足承载力要求的前提下,应尽量选取可更换耗能段腹板厚度较厚、高度较小和安装位置较低的参数进行设计。
In view of the problem that it is difficult to repair the damaged horizontal anti-falling beam limiting device of the bridge structure,this paper puts forward a new type of transverse anti-falling beam limiting device with replaceable energy dissipation section.Taking the web thickness,web depth and installation position of the replaceable energy dissipation portion as parameters,ten finite element models of the device with various parameters are established by using finite element software ABAQUS,and pseudo static simulation tests are carried out to verify its replaceable design idea,analyze its failure mechanism,and study the influence of each parameter on the hysteretic curve,bearing capacity,ductility and energy dissipation capacity of the device.The results show that the device can achieve the purpose of multiple fortification lines and graded energy consumption by damaging the replaceable energy dissipation device first and then the vertical plate.The hysteresis curve of the device is full and stable,and it presents good energy consumption capacity and no pinching.With the increase of the web thickness,the yield capacity,ultimate bearing capacity,yield displacement,ultimate displacement,ductility coefficient and energy dissipation capacity of the device increases.The depth of the web has no significant effect on the yield capacity of the device.With the increase of the web depth,the ultimate bearing capacity of the device increases gradually,the yield displacement of the device increases first and then decreases,the overall ultimate displacement decreases,and the ductility coefficient and the energy dissipation capacity decreases gradually.The installation height of the replaceable energy dissipation section has no uniform rule on the yield bearing capacity and energy dissipation capacity,but it is negatively correlated to the yield displacement,ultimate displacement and ductility coefficient.According to the analysis results,thicker web thickness,smaller height and lower installation position are recommended for the design of the device on the premise of meeting the required bearing capacity.
作者
闫磊
安康
岳克锋
李果
尹修城
姜渝
付亚男
YAN Lei;AN Kang;YUE Kefeng;LI Guo;YIN Xiucheng;JIANG Yu;FU Yanan(School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404000, China;School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400060, China)
出处
《世界地震工程》
CSCD
北大核心
2020年第3期172-180,共9页
World Earthquake Engineering
基金
中国博士后科学基金项目(2019M663442)
重庆市科委、教委研究项目(cstc2018jscx-msybX0167,KJQN201801223,KJQN201901219/32,SXAPGC19ZDI01,SXAPGC19YB09)。
关键词
可替换式
桥梁横向
限位装置
抗震性能
replaceable
transverse of bridge
limit device
seismic performance
