多跨连续梁拱组合体系桥梁施工关键问题研究
发布时间：2018-11-10 20:46
【摘要】：安康市城东汉江大桥主桥为(75+2×125+160+2×125+75)m多跨连续梁拱组合体系桥梁,全桥采用先梁后拱法施工,系梁采用平衡悬臂浇筑法施工,中跨跨中33m梁段采用支架现浇法施工。为选择合理的现浇段支架拆除时机、边跨配重卸载时机、临时固结拆除顺序以及吊杆张拉顺序和次数等,采用MIDAS Civil建立全桥有限元模型,针对各种方案下的结构进行模拟分析。结果表明:跨中现浇段的支架应在张拉完全部吊杆后再拆除;边跨配重应在中跨或次边跨合龙后再卸载;应待相邻孔合龙后再拆除前一合龙孔的临时固结;应对称交替地张拉吊杆,设计张拉力较小时可一次张拉到位,设计张拉力较大时应分批张拉到位。该桥采取以上方案施工后,结构受力状态良好。
[Abstract]:The main bridge of Hanjiang River Bridge in Ankang City is composed of (752 脳 125,1602 脳 125.75) m multi-span continuous beam-arch system. The whole bridge is constructed by the method of first beam after arch, the tie beam is constructed by balanced cantilever pouring method, and the middle span section of mid-span 33m beam is constructed by support cast-in-place method. In order to select the reasonable timing of cast-in-situ support removal, the time of loading and unloading of side span, the order of temporary consolidation removal, and the order and times of tension of suspenders, the finite element model of the whole bridge is established by MIDAS Civil, and the structure under various schemes is simulated and analyzed. The results show that the support of the cast-in-place span should be removed after all the suspenders have been tensioned, the weight of the side span should be unloaded after the middle span or the second side span is closed, the temporary consolidation of the former one should be removed after the adjacent holes are closed. When the design tension force is small, the tension can be put in place at one time, and when the design tension force is larger, the tension should be in place in batches. After the above scheme is adopted, the structure is in good stress state.
【作者单位】： 长安大学公路学院;
【基金】：国家自然科学基金项目(50908016)~~
【分类号】：U445.4;U448.22
，
本文编号：2323574
[Abstract]:The main bridge of Hanjiang River Bridge in Ankang City is composed of (752 脳 125,1602 脳 125.75) m multi-span continuous beam-arch system. The whole bridge is constructed by the method of first beam after arch, the tie beam is constructed by balanced cantilever pouring method, and the middle span section of mid-span 33m beam is constructed by support cast-in-place method. In order to select the reasonable timing of cast-in-situ support removal, the time of loading and unloading of side span, the order of temporary consolidation removal, and the order and times of tension of suspenders, the finite element model of the whole bridge is established by MIDAS Civil, and the structure under various schemes is simulated and analyzed. The results show that the support of the cast-in-place span should be removed after all the suspenders have been tensioned, the weight of the side span should be unloaded after the middle span or the second side span is closed, the temporary consolidation of the former one should be removed after the adjacent holes are closed. When the design tension force is small, the tension can be put in place at one time, and when the design tension force is larger, the tension should be in place in batches. After the above scheme is adopted, the structure is in good stress state.
【作者单位】： 长安大学公路学院;
【基金】：国家自然科学基金项目(50908016)~~
【分类号】：U445.4;U448.22
，
本文编号：2323574
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