A形混凝土中塔多塔悬索桥设计与拓展应用研究
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摘要
为提升悬索桥的连续跨越能力,以瓯江北口大桥为背景,结合长江上已建成的3座三塔悬索桥,对三塔悬索桥的设计理念、设计要点、适用性等进行研究。在此基础上,对采用A形混凝土中塔的不同跨数和不同主跨跨度的多塔连跨悬索桥方案进行受力分析和拓展应用。研究发现:三塔悬索桥的性能关键在于中塔,中塔的刚度对桥梁整体刚度起决定性作用;采用增设全竖隔板的新型中主索鞍,主缆钢丝与鞍槽间名义摩擦系数可达到0.3;采用A形混凝土中塔的三塔悬索桥大幅提高了结构整体刚度和抗风稳定性能;A形混凝土中塔应用于多塔连跨悬索桥时,其主要力学指标变化幅度有限,影响主缆滑移的显著因素是恒载与活载的比率。
In order to improve the continuous spanning capacity of suspension bridges,we studied the design concept,key points,and applicability of the three-tower suspension bridges by taking the Oujiang River North Estuary Bridge and the other three three-tower suspension bridges located in Changjiang River as research objects.On the basis of the research results above,we analyzed the mechanical behavior and application of the multi-tower suspension bridges adopting Ashaped concrete middle tower with different span numbers and different main spans.The results demonstrate that the performance of the three-tower suspension bridge depends on the middle tower,whose stiffness plays a decisive role in the overall stiffness of the bridge.The nominal friction coefficient between the main cable steel wire and the saddle groove can reach 0.3 by adding a new type of medium main cable saddle with full vertical diaphragms.The overall stiffness and wind stability of the three-tower suspension bridge can be greatly improved by using the A-shaped concrete middle tower.When the A-shaped concrete middle tower is used in multi-tower suspension bridges,the variation range of main static indicators is limited,and the significant factor affecting the slip of main cables is the ratio of dead load to live load.
In order to improve the continuous spanning capacity of suspension bridges,we studied the design concept,key points,and applicability of the three-tower suspension bridges by taking the Oujiang River North Estuary Bridge and the other three three-tower suspension bridges located in Changjiang River as research objects.On the basis of the research results above,we analyzed the mechanical behavior and application of the multi-tower suspension bridges adopting Ashaped concrete middle tower with different span numbers and different main spans.The results demonstrate that the performance of the three-tower suspension bridge depends on the middle tower,whose stiffness plays a decisive role in the overall stiffness of the bridge.The nominal friction coefficient between the main cable steel wire and the saddle groove can reach 0.3 by adding a new type of medium main cable saddle with full vertical diaphragms.The overall stiffness and wind stability of the three-tower suspension bridge can be greatly improved by using the A-shaped concrete middle tower.When the A-shaped concrete middle tower is used in multi-tower suspension bridges,the variation range of main static indicators is limited,and the significant factor affecting the slip of main cables is the ratio of dead load to live load.
引文
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[2]罗扣,舒思利,万田保,等.温州瓯江北口大桥中塔结构形式比选[J].桥梁建设,2018,48(1):88-93.(LUO Kou,SHU Si-li,WAN Tian-bao,et al.Comparison and Selection of Structural Type for Middle Tower of Oujiang River North Estuary Bridge in Wenzhou[J].Bridge Construction,2018,48(1):88-93.in Chinese)
[3]马碧波,叶雨清,白雨东,等.瓯江北口大桥中塔设计及索鞍施工预偏量影响研究[J].桥梁建设,2018,48(6):41-46.(MA Bi-bo,YE Yu-qing,BAI Yu-dong,et al.Design and Research on Intermediate Tower&Pre-Deflection of Saddles in the Construction of Oujiang River North Estuary Bridge[J].Bridge Construction,2018,48(6):41-46.in Chinese)
[4]李万恒,王元丰,李鹏飞,等.三塔悬索桥桥塔适宜刚度体系研究[J].土木工程学报,2017,50(1):75-81.(LI Wan-heng,WANG Yuan-feng,LI Peng-fei,et al.Rational Distribution Principle for the Pylon Stiffness of Three-Pylon Suspension Bridges[J].China Civil Engineering Journal,2017,50(1):75-81.in Chinese)
[5]孙斌,胡志坚,张力文,等.多塔悬索桥活载效应简化分析[J].中国公路学报,2015,28(11):60-66,81.(SUN Bin,HU Zhi-jian,ZHANG Li-wen,et al.Simplified Analysis of Live Load Responses in MultiTower Suspension Bridges[J].China Journal of Highway and Transport,2015,28(11):60-66,81.in Chinese)
[6]高宗余,史方华.温州瓯江北口大桥主桥设计关键技术[J].桥梁建设,2017,47(1):1-5.(GAO Zong-yu,SHI Fang-hua.Key Techniques of Design of Main Bridge of Oujiang River North Estuary Bridge in Wenzhou[J].Bridge Construction,2017,47(1):1-5.in Chinese)
[7]沈锐利,王路,王昌将,等.悬索桥主缆与索鞍间侧向力分布模式的模型试验研究[J].土木工程学报,2017,50(10):75-81.(SHEN Rui-li,WANG Lu,WANG Chang-jiang,et al.Experimental Study on Distribution Pattern of Lateral Force Between Main Cable and Cable Saddle for Suspension Bridge[J].China Civil Engineering Journal,2017,50(10):75-81.in Chinese)
[8]王路,沈锐利,王昌将,等.悬索桥主缆与索鞍间侧向力理论计算方法与公式研究[J].土木工程学报,2017,50(12):87-96.(WANG Lu,SHEN Rui-li,WANG Chang-jiang,et al.Theoretical Calculation Method and Formula for Lateral Force Between Main Cable and Cable Saddle for Suspension Bridge[J].China Civil Engineering Journal,2017,50(12):87-96.in Chinese)
[9]王达磊,马如进,陈艾荣.泰州长江公路大桥三塔悬索桥的颤振稳定性[J].桥梁建设,2011(1):26-29.(WANG Da-lei,MA Ru-jin,Chen Ai-rong.Flutter Stability of Triple-Tower Suspension Bridge of Taizhou Changjiang River Highway Bridge[J].Bridge Construction,2011(1):26-29.in Chinese)
[10]张新军,郭辉.三塔悬索桥施工过程抗风稳定性研究[J].土木工程学报,2011,44(12):58-63.(ZHANG Xin-jun,GUO Hui.Wind Stability of Three-Tower Suspension Bridges under Construction[J].China Civil Engineering Journal,2011,44(12):58-63.in Chinese)