深中通道变截面连续钢箱梁大节段制造参数的确定方法  

Determination of Manufacturing Parameters of Large Section of Continuous Steel Box Beam with Variable Section in Shenzhen‑Zhongshan Passage

作　　者：董创文 陈龙 李传习 DONG Chuangwen;CHEN Long;LI Chuanxi(School of Civil Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]长沙理工大学土木工程学院,湖南长沙410114

出　　处：《中外公路》2024年第6期213-218,共6页Journal of China & Foreign Highway

基　　金：湖南省交通科技项目(编号:202016)。

摘　　要：制造参数的精准计算是连续钢箱梁桥大节段安装高效高精度速成的关键。该文以深中通道变截面钢箱梁为背景,首先,建立施工全过程梁单元有限元模型,获得预拱度;其次,基于各小梁段中性轴高度统计出平均中性轴位置;然后,抓住平均中性轴处梁长不变的变形特征,在平均中性轴处叠加预拱度,给出制造线形;最后,根据受力特征给出大节段端面倾角,得到完整的钢箱梁制造参数。二期恒载加载前的实施结果表明:钢箱梁顶面线形总体平顺,实测线形与预测线形吻合良好,验证了该文方法的正确性。Accurate calculation of manufacturing parameters is the key to the efficient,high-precision,and rapid installation of large sections of continuous steel box beam bridges.Taking the steel box beam with the variable section in Shenzhen-Zhongshan Passage as the background,this paper first established a finite element model of the beam element in the whole construction process to obtain the pre-camper.Secondly,the average neutral axis position was calculated based on the height of the neutral axis of each beam section.Then,according to the deformation characteristic that the beam length remained unchanged at the mean neutral axis,the pre-camber was superimposed at the mean neutral axis to get the manufacturing line shape.Finally,according to the mechanical characteristics,the dip angle of the large section end face was given to obtain the complete manufacturing parameters of the steel box beam.The implementation results before the loading of the second-phase dead load show that the line shape of the top surface of the steel box beam is generally smooth,and the measured line shape is in good agreement with the predicted line shape,which verifies the correctness of the proposed method.

关 键 词：桥梁工程 钢箱梁 制造线形 大节段吊装 平均中性轴 

分 类 号：U445.4[建筑科学—桥梁与隧道工程] U448.215[交通运输工程—道路与铁道工程]