节段预制拼装盖梁临时预应力设计  

Temporary Pre-Stressed Design for Segmental Prefabricated Cover Beams

作　　者：田周松 TIAN Zhou-song(Shanghai Municipal Engineering Design InstituteCo.,Ltd.,Shanghai 200092,China)

机构地区：[1]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《中国市政工程》2023年第6期10-12,94,共4页China Municipal Engineering

摘　　要：采用节段预制拼装盖梁能够减轻预制节段质量。针对节段预制拼装盖梁在临时预应力作用下的接缝正应力,采用平截面假定和实体有限元2种分析方法进行计算;结果表明,背景工程的接缝断面应力分布存在一定的不均匀性,但大体接近平截面假定的计算结果。对于履带吊安装挑臂的施工方法,吊机与临时预应力荷载需逐步转换;通过经验试算确定,并经非线性规划优化后的施工顺序,可使得施工过程中接缝断面压应力不小于目标值且尽量均匀。Theuse of segmental prefabricated assembly of cover beams can reduce the quality of prefabricated segments.Two analysis methods,namely the assumption of plane section&solid finite element method,are used to calculate the normal stress of the joint of the prefabricated cover beam under temporary prestress.The results indicate that there is a certain degree of non-uniformity in the stress distribution of the joint section in the background engineering,but it is generally close to the calculation results assumed by the plane section.For the construction method of installing cantilever arms for crawler cranes,the crane and temporary prestress load need to be gradually converted.The construction sequence determined through empirical calculation and optimized by nonlinear programming can ensure that the compressive stress on the joint section during the construction process is not less than the target value and as uniform as possible.

关 键 词：节段拼装盖梁 环氧胶接缝 临时预应力 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]