强震区轻骨料混凝土桥梁地震响应研究  

Seismic response of lightweight aggregate concrelte bridges in earthquake-prone areasl

作　　者：惠迎新[1] 台玉吉 金宝宏[1] 王海东 HUI Yingxin;TAI Yuji;JIN Baohong;WANG Haidong(College of Civil and Hydraulic Engineering, Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021

出　　处：《世界地震工程》2019年第1期193-200,共8页World Earthquake Engineering

基　　金：宁夏高等学校优青培育基金(NGY2017005)

摘　　要：为研究轻骨料混凝土桥梁的地震响应,以一座强震区典型连续梁桥为研究对象,在考虑轻骨料混凝土材料特性基础上建立桥梁结构有限元分析模型,采用非线性动力时程分析法进行结构地震响应分析,研究轻骨料混凝土材料布设位置对桥梁结构动力特性和地震响应的影响,并从内力和位移响应方面与普通混凝土桥梁进行对比。结果表明:与普通混凝土桥梁相比,仅上部结构或仅下部结构采用轻骨料混凝土对降低桥墩内力并不明显,而全桥采用轻骨料混凝土能够显著降低桥墩内力。轻骨料混凝土桥梁与普通混凝土桥梁地震内力和位移响应变化趋势不同,桥墩塑性发展程度和时间存在差异。采用轻骨料混凝土桥梁方案时,应综合考虑结构质量、刚度分布及材料塑性特性与普通混凝土桥梁的不同,合理确定抗震设计方案。In order to study the seismic response of the lightweight aggregate concrete bridges, a typical continuous beam bridge in the earthquake-prone area was selected as the research object. Based on the characteristics of lightweight aggregate concrete materials, the finite element model of the bridge structure was established. Nonlinear dynamic time-history analysis was used to study the influence of the location of the lightweight aggregate concrete material on the dynamic characteristics and seismic responses of the bridge structure, and its internal force and displacement responses were compared with those of the conventional concrete bridge. The results show that the use of lightweight aggregate concrete for only the superstructure or substructure can not reduce the internal force of the pier significantly, while its use for the entire bridge can. The trend of seismic internal force and displacement responses of the bridges and the plasticity development of the piers are different with those of the ordinary concrete bridges. When the lightweight aggregate concrete bridge scheme is adopted, the difference of the structural quality, stiffness distribution and material plasticity characteristics with the ordinary concrete bridges should be comprehensively considered, and a reasonable seismic design scheme should be applied.

关 键 词：轻骨料混凝土 非线性时程分析 动力特性 地震响应 

分 类 号：U448[建筑科学—桥梁与隧道工程]