Optimization analysis of double launching noses during launching construction of multi-span continuous girder bridge

doi:10.3785/j.issn.1008-973X.2021.07.008

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (7): 1289-1298 DOI: 10.3785/j.issn.1008-973X.2021.07.008

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

Received: 27 June 2020 Published: 05 July 2021

CLC:

U 445

Fund: 国家自然科学基金资助项目（51708269）；甘肃省科技重点研发计划资助项目（20YF3FA039）；甘肃省建设科技攻关项目（JK2021-20）

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Cite this article:

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.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.07.008 OR https://www.zjujournals.com/eng/Y2021/V55/I7/1289

多跨连续梁桥顶推施工双导梁的优化分析

为了合理选择多跨混凝土连续梁桥顶推施工中前后双导梁的长度、单位荷载集度及抗弯刚度等参数，以三跨等跨混凝土连续梁桥为例，构建主梁-双导梁的计算简化模型. 利用位移法建立节点平衡方程，推导出各个节点的内力解析表达式. 分别研究不同导梁参数对支点最大负弯矩和跨内最大正弯矩的影响，揭示了在顶推施工过程中主梁内力的变化规律. 以实桥数值算例为例，提出合理、严谨的导梁参数优化计算方法，获得最优的导梁参数. 基于不同的前后导梁长度，分析不等跨连续梁桥的内力变化规律. 研究结果表明，等跨连续梁桥中不同导梁长度会影响顶推阶段，对于不等跨连续梁桥更加复杂. 在不等跨连续梁桥中，后导梁长度对支点最大负弯矩的影响较小，前导梁长度对支点最大负弯矩的影响较大. 实桥算例中导梁的最优长度比、单位荷载集度比及抗弯刚度比分别为0.78、0.14及0.39，提出的导梁参数优化计算方法简单，可以对不同的截面形式进行优化.

关键词： 桥梁工程, 导梁参数, 位移法, 连续梁桥

Fig.1 Schematic diagram of three-span concrete continuous girder bridge

Fig.2 Sketch of first launching stage (0 < α ≤ 0.5)

Fig.3 Sketch of second launching stage (0 < α ≤ 0.5)

Fig.4 Sketch of first launching stage (0.5 < α < 1.0)

Fig.5 Sketch of second launching stage (0.5 < α < 1.0)

Fig.6 Sketch of third launching stage (0.5 < α < 1.0)

Fig.7 Influence of different bending stiffness ratio on negative bending moment at E fulcrum

Fig.8 Influence of different unit load concentration ratio on negative bending moment at E fulcrum

Fig.9 Influence of different length ratio on negative bending moment at E fulcrum

Fig.10 Influence of different length ratio on maximum positive moment within EF span

Fig.11 Influence of different unit load concentration ratio on maximum positive moment within EF span

Fig.12 Influence of different bending stiffness ratio on maximum positive moment within EF span

Fig.13 Relationship between length ratio and unit load concentration ratio under optimal parameters of launching nose

Fig.14 Cross section of box girder

Fig.15 Relationship between maximum tensile stress and unit load concentration ratio

Fig.16 Values of l_n1 and l_n2 in research condition

Fig.17 Unequal span continuous girder bridge launching calculation diagram

Fig.18 Influence of different bending stiffness ratio on negative bending moment at F fulcrum

Fig.19 Influence of different unit load concentration ratio on negative bending moment at F fulcrum

Fig.20 Influence of different length ratio on negative bending moment at F fulcrum


[1]	XU R Q, SHAO B L New beam element for incremental launching of bridges[J]. Journal of Bridge Engineering, 2011, 17 (5): 822- 826

[2]	KWANGHOE J P E, KWANGSOO K, CHUNGWOOK S, et al Verification of incremental launching construction safety for the IIsun bridge, the world’s longest and widest prestressed concrete box girder with corrugated steel web section[J]. Journal of Bridge Engineering, 2011, 16 (3): 453- 460 doi: 10.1061/(ASCE)BE.1943-5592.0000165

[3]	GRANATA M F Analysis of non-uniform torsion in curved incrementally launched bridges[J]. Engineering Structures, 2014, 75: 374- 387 doi: 10.1016/j.engstruct.2014.05.047

[4]	WANG J F, LIN J P, XU R Q Incremental launching construction control of long multispan composite bridges[J]. Journal of Bridge Engineering, 2015, 20 (11): 1- 9

[5]	赵人达, 张双洋桥梁顶推法施工研究现状及发展趋势[J]. 中国公路学报, 2016, 29 (2): 32- 43 ZHAO Ren-da, ZHANG Shuang-yang Research status and development trend on incremental launching construction of bridges[J]. China Journal of Highway and Transport, 2016, 29 (2): 32- 43 doi: 10.3969/j.issn.1001-7372.2016.02.005

[6]	GRANATA M F Adjustable prestressing for construction stages of incrementally launched bridges[J]. European Journal of Environmental and Civil Engineering, 2015, 19 (3): 327- 346 doi: 10.1080/19648189.2014.949871

[7]	BEANEY N J, MARTIN J M Design and construction of the dornoch firth bridge: construction[J]. Proceedings of Institution Civil Engineering Transportation, 1993, 100 (3): 145- 156 doi: 10.1680/itran.1993.24296

[8]	ROSIGNOLI M Nose-deck interaction in launched prestressed concrete bridges[J]. Journal of Bridge Engineering, 1998, 3 (1): 21- 27 doi: 10.1061/(ASCE)1084-0702(1998)3:1(21)

[9]	ROSIGNOLI M Prestressing schemes for incrementally launched bridges[J]. Journal of Bridge Engineering, 1999, 4 (2): 107- 115 doi: 10.1061/(ASCE)1084-0702(1999)4:2(107)

[10]	田仲初, 张华平顶推施工中导梁的合理配置[J]. 世界桥梁, 2005, 33 (4): 41- 43 TIAN Zhong-chu, ZHANG Hua-ping Reasonable arrangement of launching nose in incremental launching construction[J]. World Bridges, 2005, 33 (4): 41- 43 doi: 10.3969/j.issn.1671-7767.2005.04.012

[11]	ARTURO N F, SANTIAGO H, AITOR B Simultaneous cross section and launching nose optimization of incrementally launched bridges[J]. Journal of Bridge Engineering, 2014, 19 (3): 1

[12]	ROSIGNOLI M Nose optimization in launched bridges[J]. Structures and Buildings, 1999, 134 (4): 373- 375

[13]	LEE H W, JANG J Y Simplified analysis formula for the interaction of the launching nose and the superstructure of ILM bridge[J]. Journal of the Computational Structural Engineering Institute of Korea, 2012, 25 (3): 245- 258 doi: 10.7734/COSEIK.2012.25.3.245

[14]	ARTURO N F, JACOBO M, AITOR B, et al Improved optimization formulations for launching nose of incrementally launched prestressed concrete bridges[J]. Journal of Bridge Engineering, 2011, 16 (3): 461- 470 doi: 10.1061/(ASCE)BE.1943-5592.0000169

[15]	MOHAMMAD R H, EHSAN R, AMIN M, et al A mathematical investigation on the optimum design of the nose-deck system in incrementally launched bridges[J]. European Journal of Scientific Research, 2013, 108 (1): 38- 52

[16]	王卫锋, 林俊锋, 马文田桥梁顶推施工导梁的优化分析[J]. 工程力学, 2007, 24 (2): 132- 138 WANG Wei-feng, LIN Jun-feng, MA Wen-tian Optimum analysis of launching nose during incremental launching construction of bridge[J]. Engineering Mechanics, 2007, 24 (2): 132- 138 doi: 10.3969/j.issn.1000-4750.2007.02.023

[17]	董创文, 李传习连续梁顶推导梁合理参数的确定方法[J]. 公路交通科技, 2010, 27 (9): 55- 62 DONG Chuang-wen, LI Chuan-xi Method for determination of reasonable parameters of launching nose for continuous beam[J]. Journal of Highway and Transportation Research and Development, 2010, 27 (9): 55- 62 doi: 10.3969/j.issn.1002-0268.2010.09.010

[18]	谢福君, 张家生钢箱梁顶推参数影响及稳定性分析[J]. 铁道科学与工程学报, 2019, 16 (6): 1484- 1492 XIE Fu-jun, ZHANG Jia-sheng Influence analysis and stability analysis for incremental launching of steel box girder[J]. Journal of Railway Science and Engineering, 2019, 16 (6): 1484- 1492

[19]	龙驭球, 包世华. 结构力学[M]. 北京: 高等教育出版社, 2018: 212-220.

[20]	梁爱斌, 王春生, 徐岳采用MATLAB语言开发连续梁桥顶推施工结构分析程序[J]. 交通与计算机, 2000, 18 (5): 57- 61 LIANG Ai-bin, WANG Chun-sheng, XUN Yue Use the application of MATLAB to programming for the compute program of continuous girder bridge by incremental launching[J]. Traffic and Computer, 2000, 18 (5): 57- 61

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