浙江大学学报(工学版)  2021, Vol. 55 Issue (7): 1289-1298    DOI: 10.3785/j.issn.1008-973X.2021.07.008
 土木工程、水利工程

1. 兰州交通大学 土木工程学院，甘肃 兰州 730070
2. 中铁十八局集团有限公司，天津 300000
Optimization analysis of double launching noses during launching construction of multi-span continuous girder bridge
Wei JI1,2(),Tian-yan SHAO1
1. College of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2. China Railway 18th Bureau Group Limited Company, Tianjin 300000, China
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Abstract:

A simplified calculation model of the girder-double noses was constructed by taking the three span concrete continuous girder bridge with equal span as an example in order to reasonably select the parameters such as the length, unit load concentration and bending stiffness of the double launching noses during the launching construction of the multi-span concrete continuous girder bridge. The balance equation of each node was established by displacement method, and the analytical expression of internal forces of each node was derived. The influences of different launching nose parameters on the maximum negative moment at fulcrum and the maximum positive moment within the span were analyzed, and the variation rule of the internal forces of the girder during the launching construction was revealed. Then a reasonable and rigorous method for optimizing the launching nose parameters was proposed by taking the numerical example of a real bridge as an example, and the optimal launching nose parameters were obtained. The internal force variation rule of unequal span continuous girder bridge was analyzed according to the different length of front and rear launching nose. Results show that the launching stage is affected by the length of launching nose in the continuous girder bridge with equal span, and it is more complicated for the continuous girder bridge of unequal span. In the unequal span continuous girder bridge, the length of rear launching nose has little effect on the maximum negative moment at fulcrum, while the length of front launching nose has great effect on the maximum negative moment at fulcrum. In the real bridge example, the optimal length ratio, unit load concentration ratio and bending stiffness ratio of the launching nose are 0.78, 0.14 and 0.39 respectively. The proposed optimization method for launching nose parameters is simple and can be used for optimization of different section forms.

Key words: bridge engineering    launching nose parameter    displacement method    continuous girder bridge

 CLC: U 445

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#### 引用本文:

Wei JI,Tian-yan SHAO. Optimization analysis of double launching noses during launching construction of multi-span continuous girder bridge. Journal of ZheJiang University (Engineering Science), 2021, 55(7): 1289-1298.

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 图 1  三跨混凝土连续梁桥顶推的示意图 图 2  第1顶推阶段计算简图（0 < α ≤ 0.5） 图 3  第2顶推阶段的计算简图（0 < α ≤ 0.5） 图 4  第1顶推阶段计算简图（0.5 < α < 1.0） 图 5  第2顶推阶段的计算简图（0.5 < α < 1.0） 图 6  第3顶推阶段的计算简图（0.5 < α < 1.0） 图 7  不同抗弯刚度比对E支点处负弯矩的影响 图 8  不同单位荷载集度比对E支点处负弯矩的影响 图 9  不同长度比对E支点处负弯矩的影响 图 10  不同长度比对EF跨内最大正弯矩的影响 图 11  不同单位荷载集度比对EF跨内最大正弯矩的影响 图 12  不同抗弯刚度比对EF跨内最大正弯矩的影响 图 13  最优导梁参数下长度比与单位荷载集度比的关系 图 14  箱梁的横截面图 图 15  截面最大拉应力与单位荷载集度比的关系 图 16  研究工况中ln1与ln2的取值 图 17  不等跨连续梁桥顶推计算简图 图 18  不同抗弯刚度比对F支点处负弯矩的影响 图 19  不同单位荷载集度比对F支点处负弯矩的影响 图 20  不同长度比对F支点处负弯矩的影响
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