港珠澳大桥青州航道桥索塔结形撑安装精细化分析

发布时间：2018-03-01 10:50

本文关键词： 桥梁工程结形撑安装有限元分析焊接收缩量港珠澳大桥　出处：《中国公路学报》2016年12期 　论文类型：期刊论文

【摘要】：为明确结形撑安装过程中的变形机理及其影响因素,针对港珠澳大桥青州航道桥索塔"中国结"形撑构造异形,杆件倾角大,栓接、焊接混合施工工艺等特点,采用ABAQUES进行了结形撑安装过程的敏感性分析、焊接施工接口姿态影响分析及安装过程变形精细化分析,基于DFLUX子程序及双椭球热源模型编制了热分析子程序,并进行焊接温度场分析,将焊接温度场分析结果采用顺序耦合的方式读入应力-应变场模型进行了焊接收缩量分析。结果表明:对于港珠澳大桥结形撑T2件安装,塔柱双向温度梯度、整体升降温为敏感因素,临时荷载、临时横撑数量为不敏感因素;对于T1件安装,敏感因素仍为塔柱双向温度梯度、整体升降温,临时荷载为不敏感因素,拆除塔顶第1根横撑时影响较小,拆除2根横撑时影响较大;进行结形撑对接施工时,焊缝收缩量与焊缝根部宽度呈线性关系,通过分析结果拟合得到了二者的关系曲线,可供实际施工中使用;结形撑构件J1,J2,J3吊装过程中,塔柱及吊装件变形量小于1mm,可认为其不影响安装精度。
[Abstract]:In order to make clear the deformation mechanism and its influencing factors during the installation of knot brace, aiming at the characteristics of "China knot" brace structure of Qingzhou Waterway Bridge of Hongkong-Zhuhai-Macao Bridge, the characteristics of "China knot" brace structure, large inclination of bar, bolted connection, welding mixed construction technology, etc. ABAQUES is used to analyze the sensitivity of the installation process, the welding construction interface attitude analysis and the deformation refinement analysis during the installation process. Based on the DFLUX subroutine and the double ellipsoid heat source model, the thermal analysis subprogram is compiled. The welding temperature field was analyzed, and the results of welding temperature field analysis were read into the stress-strain field model to analyze the welding shrinkage. For T1 installation, the sensitive factor is bidirectional temperature gradient of tower column, the whole rising and cooling is sensitive factor, the temporary load is insensitive factor, and the temporary load is insensitive factor, for T1 installation, the sensitive factor is still the bidirectional temperature gradient of tower column, the whole rise and drop temperature, and the temporary load is insensitive factor. When removing the first transverse brace at the top of the tower, the influence is small, and the influence is greater when removing the two transverse braces, and the shrinkage of the weld is linearly related to the width of the root of the weld when the junction brace is docked, and the curve of the relationship between the two is obtained by fitting the analysis results. It can be used in practical construction, and the deformation of tower column and lifting parts is less than 1mm during the hoisting process of J1 / J2 / J3, which can be considered as not affecting the installation accuracy.
【作者单位】：长安大学公路学院;同济大学建筑设计研究院(集团)有限公司;
【基金】：中国博士后科学基金项目(2015M572511) 中央高校基本科研业务费专项资金项目(310821161012)
【分类号】：U445.58

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