逐跨拼装中小跨径连续刚构桥临时固结方案优化研究  

Optimization and Research on Temporary Consolidation Scheme for Assembling Short to and Medium-Span Continuous Rigid Frame Bridges Span by Span

作　　者：桂水荣[1] 尧晨 谢阳福 陈水生[1] GUI Shui-rong;YAO Chen;XIE Yang-fu;CHEN Shui-sheng(Department of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;No.2Engineering Company of China Railway No.8Engineering Group Co.Ltd.,Chengdu 610000,China)

机构地区：[1]华东交通大学土木建筑学院,南昌市330013 [2]中铁八局集团第二工程有限公司,成都市610000

出　　处：《公路》2021年第4期78-84,共7页Highway

摘　　要：为优化中小跨径连续刚构桥逐跨节段拼装施工的边墩临时固结,以南昌市洪都高架桥PM45~PM48为研究对象,采用Midas软件建立"整体杆系+局部实体"的全桥有限元模型。结合现场临时固结方案,分两种优化方案,研究边墩临时固结方法对逐孔节段拼装不同点位的内力及变形的影响。结果表明:临时固结方案不同,主梁顺桥向位移不同,会导致成桥后内力不同。全联拼装完再解除边墩临时固结,有利于施工中线形控制,墩底截面拉应力也能够得到优化。临时固结的刚度越大,顺桥向位移越小,对边墩墩底应力影响就越大。对于完全刚性的临时固结,结构体系转换前后PM48墩底应力幅值变化最大;弱化固结刚度时,边墩顺桥向位移变化幅值最大。In order to optimize the temporary consolidation of the side piers of the short to mediumspan continuous rigid frame bridge assembly construction span-by-span,the Hongdu Viaduct Bridge PM45~PM48 of Nanchang City is taken as the study background.Midas software is used to establish finite element model of the integral rod system plus local entity for the whole bridge.Combined with the on-site temporary consolidation scheme,two optimization schemes of the temporary consolidation method of the side pier have been analyzed to get the effect of internal force and deformation of the different points using assembly construction span by span.The results show that:different temporary consolidation schemes and different displacements of the main girder along the bridge lead to different internal forces after the bridge is completed.The temporary consolidation of the side piers is released after the complete assembly is completed,which is conducive to the linear control in the construction,and the tensile stress of the pier bottom section can also be optimized.The greater the stiffness of the temporary consolidation,the smaller the displacement along the bridge direction,and the greater the impact on the stress at the bottom of the side pier.For complete rigid temporary consolidation,the stress amplitude of PM48 pier bottom changes the most before and after the structural system conversion;the consolidation stiffness is weakened,and the displacement of the side piers along the bridge changes the most amplitude.

关 键 词：中小跨径连续刚构桥 节段预制拼装 临时固结方案优化 成桥阶段力学性能 研究 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]