摘要
以一座三跨连续斜交箱梁桥为背景,应用SAP2000建立全桥有限元模型,采用非线性时程分析方法,研究了纵向地震输入下,桥台及台后填土对不同斜度连续梁桥上部主梁及墩柱内力和位移的影响。结果表明:对于斜交连续梁桥,桥台能够减小主梁惯性力,约束主梁及墩柱的纵向位移,但会增大其横向位移,且斜交角度越大,纵向约束效果越弱,横向位移越明显;桥台作用一方面会加剧斜交连续梁桥上部主梁的旋转效应,另一方面会使得两个桥墩出现不均衡受力,斜交角度越大,旋转效应越明显,不均衡受力也越明显。建议在进行抗震设计时,应考虑桥台的作用,对不同斜度的斜交连续梁桥进行个性化设计,以提高斜交连续梁桥的抗震性能。
With a three-span continuous skew box girder bridge as the background,the research about the influence of abutment and backfill on internal force and displacement of upper main girder and pier column of continuous girder bridge with different skew angles under longitudinal seismic input has been carried out,with the application of SAP2000 to establish a finite element model of the bridge and the nonlinear time history analysis.The results show that the abut⁃ments can reduce the inertia force of main girder and restrain the longitudinal displacement of main girder and pier col⁃umn,but increase its lateral displacement.With the increase of skew angle,the longitudinal restraint effect is weaker and the lateral displacement is more obvious.On the one hand,abutment effect will aggravate the rotation effect of the up⁃per main girder of skew continuous girder bridge.On the other hand,the abutment function causes unbalanced force of the two piers.With the increase of skew angle,the more obvious the rotation effect of the main girder and the more obvi⁃ous unbalanced force present in the two piers.In order to improve the seismic performance of skew continuous girder bridges,it is suggested that the influence of abutment should be taken into account in seismic design and individualized design of skew continuous girder bridges with different skew angles should be carried out.
作者
王荣霞
曹宏琨
王雅静
WANG Rongxia;CAO Hongkun;WANG Yajing(School of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)
出处
《河北工业大学学报》
CAS
2021年第4期70-77,共8页
Journal of Hebei University of Technology
基金
国家自然科学基金(51478074)
廊坊市科技支撑计划(2016013073,2017013003)。
关键词
斜交连续梁桥
斜交角
桥台
台后填土
抗震性能
有限元
skew continuous girder bridge
skew angle
abutments
backfill
seismic capacity
finite element method
