大跨径斜拉桥组合梁节段匹配制造足尺模型试验

Full-Scale Model Tests for Matching Fabrication of Composite Girder Blocks of Long Span Cable-Stayed Bridge

泉州湾跨海大桥主桥为（70＋130＋400＋130＋70）m双塔分幅式组合梁斜拉桥，组合梁整体节段间桥面板采用匹配预制工艺，并通过钢梁反拱为桥面板提供横向预应力。为验证该桥组合梁整体节段匹配制造工艺可行性、掌握梁段经历横向反拱后的回弹规律，选取5个梁段进行组合梁足尺模型试验，并与有限元模型理论值进行对比分析。结果表明：所采用的整体节段匹配制造工艺及横向反拱设备是可行的；钢梁反拱至17～18mm时可为桥面板预存1．5～3MPa压应力，梁段在经历横向反拱过程后，将为组合梁节段桥位横向匹配连接累积不大于1．5mm的不利误差，这些数据将为实桥后续梁段匹配制造及安装施工参数的确定提供依据。

The main bridge of Quanzhou Bay Sea-Crossing Bridge is a composite girder cablestayed bridge with double pylons, separated decks and with span arrangement （70＋130＋400＋ 130＋70） m. The integral blocks and deck slabs of the composite girder of the bridge were fabricated, using the workmanship of matching fabrication and the transverse prestress of the deck slabs was provided by the inverted cambering of the steel girder. To check the feasibility of the workmanship for the fabrication of the composite girder blocks and to master the rebounding law of the blocks after the blocks went through the transverse inverted cambering, 5 integral blocks were selected, the full-scale model tests were made and the tests were analytically compared to the theoretic values of the finite element model. The results of the comparison indicate that the workmanship for the fabrication of the blocks and the transverse inverted cambering equipment used in the fabrication are feasible. The inverted cambering of the steel girder to 17-18 mm can reserve 1. 5 - 3. 0 MPa compressive stress for the deck slabs. After experiencing the inverted cambering, the blocks will cumulate unfavorable errors that are not greater than 1.5 mm for the transverse matching joints of the composite girder and these error data will provide basis for determining the construction parameters for the successive matching fabrication and installation of the blocks of the bridge.