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荀敬川,刘吉诚. 全混凝土无背索斜拉桥的运营安全分析[J]. 科学技术与工程, 2019, 19(33): 371-376.
Xun Jingchuan,Liu Jicheng.Operation Safety Analysis of Concrete Cable-stayed Bridge without Back Stays[J].Science Technology and Engineering,2019,19(33):371-376.
全混凝土无背索斜拉桥的运营安全分析
Operation Safety Analysis of Concrete Cable-stayed Bridge without Back Stays
投稿时间:2019-04-08  修订日期:2019-08-17
DOI:
中文关键词:  
英文关键词:Bridge engineering  Cable-stayed bridge without back stays  Multiple live loads  Safety factor  Instability failure
基金项目:中国博士后科学(2015M572511);中央高校基本科研业务费专项资金项目(310821161012).
     
作者单位
荀敬川 中建路桥集团有限公司
刘吉诚 中建路桥集团有限公司
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中文摘要:
      为研究全混凝土无背索斜拉桥结构在超载运营时的安全状态,以某桥为背景,采用空间结构有限元数值分析方法,基于双重非线性理论对无背索斜拉桥进行极限承载力分析。在设计车道荷载作用下,通过迭代计算多倍活荷载分析了桥梁结构首次出现开裂、斜拉索应力超过安全限值直至结构形成机构而进入破坏阶段的全过程结构安全系数,并得到结构应力、变形、索力等主要力学参数的变化规律。研究表明,此桥在主跨区域满布荷载时,截面的最不利开裂荷载为2.22倍的活荷载;拉索应力满足规范要求时最不利为6.14倍的活荷载;结构破坏时的最不利荷载为12.10倍的活荷载,且车辆偏载时的安全系数均小于中载。因此,该桥在运营过程中,应重视长索的索力状态,并尽量避免主跨区域重载车辆偏载停滞。
英文摘要:
      In order to study the safety state of concrete cable-stayed bridge without back stays under overload operation, the ultimate bearing capacity of a bridge is analyzed based on the dual non-linear theory and the finite element numerical analysis method. Under the live load, the safety factor of the bridge structure is analyzed by adding multiple live loads, which is the cracking of bridge structure; the stress of cable exceeding the safety limit and the failure stage. The main mechanical parameters such as structural stress, deformation and cable force are concerned. The results show that when the main span area is full of loads, the most unfavorable cracking load of the section is 2.22 times of the live load; the most unfavorable load for the cable when it meets the code requirements is 6.14 times the live load; and the most unfavorable load when the structure is destroyed is 12.10 times the live load. And the safety factor of vehicle partial load is less than that of medium load. Therefore, during the operation of the bridge, the cable tension state of long cables should also be paid attention to in the operation and management and the stagnation of unbalanced load of heavy vehicles in the main span area should be avoided as far as possible.
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