摘要
以深圳市南坪快速路立交主线桥为背景,基于该桥的空间实体有限元模型,采用单一参数控制法,研究桥台高度、台后填土抗力、桩侧土体抗力3个变量在温升、温降2种工况下对桥梁结构的应力、位移等静力指标和基频、反应谱等动力指标的影响。研究结果表明:桥台增高,台后土压力随之增大,桩基顶顺桥向水平位移减小,自振基频增加;台背填土抗力增加,直接减小了桩基顶水平位移,提高自振频率;桩侧土抗力增加,提高了结构整体刚度,地震荷载作用下结构顺桥向水平位移减小。
In this paper,a main overpass bridge in Shenzhen Nanping expressway was chosen as the research background,based on which a spatial solid finite element model was built.The single parameter control method was used to investigate the influences of three parameters,i.e.,abutment height,backfill resistance,and pile lateral soil resistance,on the static indices such as the structural stress,displacement and the dynamic indices such as the fundamental frequency and response spectrum of the structure under two conditions(temperature increase and decrease).The results indicate that with the increase of abutment height,the earth pressure behind the abutment increases and the horizontal displacement of the top of the pile along bridge decreases and the natural frequency of vibration increases.The increase of backfill resistance directly reduces the horizontal displacement of the top of the pile and increases the frequency of the vibration.The resistance of soil increases;as a result,the overall rigidity of the structure improves and its horizontal displacement along the bridge reduces seismic loading.
作者
王先前
郭晓燕
严国齐
WANG Xianqian;GUO Xiaoyan;YAN Guoqi(Shenzhen Municipal Design&Research Institute Co.Ltd,Shenzhen 518031,China;Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2018年第9期2276-2284,共9页
Journal of Railway Science and Engineering
基金
深圳市交委科技项目(20160317034B)
关键词
整体式桥梁
静力性能
动力性能
参数分析
integral bridge
dynamic performance
static performance
parametric analysis
