| 无背索斜拉桥主塔受力及抗震性能分析 |
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| 引用本文： | 荀敬川,刘吉诚,彭晶蓉,李源.无背索斜拉桥主塔受力及抗震性能分析[J].西北地震学报,2019,41(5):1133-1140. |
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| 作者姓名： | 荀敬川 刘吉诚 彭晶蓉 李源 |
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| 作者单位： | 中建路桥集团有限公司, 河北 石家庄 050001;长安大学公路学院, 陕西 西安 710064,中建路桥集团有限公司, 河北 石家庄 050001,西安工业大学, 陕西 西安 710021,长安大学公路学院, 陕西 西安 710064 |
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| 基金项目： | 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） |
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| 摘 要： | 为探讨主塔横梁对无背索斜拉桥结构的静动力特性影响,以某无背索斜拉桥为原型,采用三维静\,动力有限元计算方法,分析了实心横梁、大空心横梁、小空心横梁与无横梁四种主塔横梁方案的静、动力结构特性。静力计算结果表明:在最不利荷载作用下,四种对比方案中,实心横梁的拉索应力接近安全系数临界值;横梁重量越大,主梁挠度及主塔顺桥向变形值越小,且未设置横梁的方案在长期荷载作用下产生主跨侧的收缩徐变变形值。动力计算结果表明:大空心横梁方案结构横桥向刚度最大塔底轴力最大、横桥向弯矩值最大;无横梁时横桥向剪力最大,且无横梁方案使得主塔刚度较小,阵型易出现主塔横向失稳。综合考虑结构静、动力特性与施工便利性和后期维护,建议该结构采用实心主塔横梁。
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| 关 键 词： | 桥梁工程 无背索斜拉桥 静动力特性 主塔横梁 有限元分析 |
| 收稿时间： | 2018/1/1 0:00:00 |
Force Analysis and Seismic Performance of Main Tower in a Cable-Stayed Bridge Without Backstay |
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| XUN Jingchuan,LIU Jicheng,PENG Jingrong and LI Yuan.Force Analysis and Seismic Performance of Main Tower in a Cable-Stayed Bridge Without Backstay[J].Northwestern Seismological Journal,2019,41(5):1133-1140. |
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| Authors: | XUN Jingchuan LIU Jicheng PENG Jingrong and LI Yuan |
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| Institution: | CSCEC Road and Bridge Group Co., Ltd, Shijiazhuang 050001, Hebei, China;School of Highway, Chang''an University, Xi''an 710064, Shaanxi, China,CSCEC Road and Bridge Group Co., Ltd, Shijiazhuang 050001, Hebei, China,Xi''an Technological University, Xi''an 710021, Shaanxi, China and School of Highway, Chang''an University, Xi''an 710064, Shaanxi, China |
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| Abstract: | To study the influence of the beam between pylons on the static and dynamic characteristics of cable-stayed bridges without backstays, taking a bridge without backstays as an example, four finite element models are set up to analyze the static and dynamic structural characteristics and seismic response of solid beams, big hollow beams, small hollow beams, and the structure without beams with the three-dimensional static and dynamic finite element method. The static calculation results show that in the four schemes, the cable tension of structure with solid beam under the most unfavorable load reaches the safety factor critical value. Moreover, the deflection of the main beam and the longitudinal deformation of the main tower decrease as the weight of the pylon beam increases. The shrinkage creep deformation value of the pylon without beams under long-term load deviates from the main span. The dynamic calculation results show that for the second scheme, the axial force and transverse bending moment value of the tower bottom are the largest. The transverse shear force is the largest for the fourth scheme, and the stiffness of the structure without beams is small, which makes the pylon prone to transverse instability. Considering the static and dynamic analysis results, construction convenience, and the maintenance of structures, it is suggested that the solid beam tower be used in the structure. |
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| Keywords: | bridge engineering cable-stayed bridge without backstay static and dynamic characteristics main tower beam finite element analysis |
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