[1]杨永清,李世伟,蒲黔辉,等.大跨悬浇箱梁桥三维非线性收缩徐变效应[J].东南大学学报(自然科学版),2018,48(6):1036-1043.[doi:10.3969/j.issn.1001-0505.2018.06.008]
 Yang Yongqing,Li Shiwei,Pu Qianhui,et al.3D nonlinear shrinkage and creep effects of long span cantilever casting box girder bridges[J].Journal of Southeast University (Natural Science Edition),2018,48(6):1036-1043.[doi:10.3969/j.issn.1001-0505.2018.06.008]
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大跨悬浇箱梁桥三维非线性收缩徐变效应()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
48
期数:
2018年第6期
页码:
1036-1043
栏目:
土木工程
出版日期:
2018-11-20

文章信息/Info

Title:
3D nonlinear shrinkage and creep effects of long span cantilever casting box girder bridges
作者:
杨永清1李世伟1蒲黔辉1孙宝林1伍波2
1西南交通大学土木工程学院, 成都 610036; 2云南省交通规划设计研究院有限公司, 昆明 650041
Author(s):
Yang Yongqing1 Li Shiwei1 Pu Qianhui1 Sun Baolin1 Wu Bo2
1School of Civil Engineering, Southwest Jiaotong University, Chengdu 610036, China
2Yunnan Tongqu Highway Engineering Co., Ltd., Kunming 650041, China
关键词:
桥梁工程 三维收缩徐变效应 非线性徐变 悬臂浇筑箱梁桥
Keywords:
bridge engineering effect of three-dimensional shrinkage and creep nonlinear creep cantilever casting box girder bridges
分类号:
TU378.7;U448.35
DOI:
10.3969/j.issn.1001-0505.2018.06.008
摘要:
为准确分析收缩徐变效应对悬臂浇筑施工大跨径预应力混凝土箱梁桥长期结构行为的影响,提出了一种三维非线性收缩徐变分析模型,形成了完整的三维收缩徐变效应与材料非线性耦合分析理论框架. 建立了相应的数值分析方法,并嵌入到有限元分析软件ABAQUS中,通过某典型钢筋混凝土简支梁长期徐变试验的模拟计算,验证了所提方法的准确性.以某主跨220m连续刚构桥为例,分析了大跨悬浇箱梁桥主梁的空间时变应力与跨中长期下挠规律.结果表明:收缩的三维特性是导致箱梁接缝处拉应力过大的主要原因;在分析预测主梁长期下挠时,需要综合考虑收缩徐变的三维特性和徐变的非线性特征,否则会显著低估桥梁的长期变形.
Abstract:
In order to analyze the influence of shrinkage and creep(SC)effects on the long-term structural behaviors of long span prestressed concrete(PC)box girder bridges by the cantilever casting method, a nonlinear SC effect analysis model was presented and the complete theoretical framework for coupling analysis of three-dimensional(3D)SC effects and material nonlinearity was described. A corresponding numerical analysis method was established and implemented into the commercial finite element software ABAQUS. The accuracy of the proposed model was verified by the numerical simulation of a long-term creep test of simply supported reinforced concrete(RC)beams. The time-varying spatial stress in the box girders and the long-term deflection at the mid-span were analyzed by taking a continuous rigid frame bridge with the main span of 220 m as an example. The results show that the 3D characteristic of shrinkage is the main cause of the excessive tensile stress at the concrete joints of box girders. The 3D characteristics of SC and the nonlinear property of creep need to be comprehensively considered when analyzing the long-term deflection of box girders; otherwise the deflection is significantly underestimated.

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备注/Memo

备注/Memo:
收稿日期: 2018-05-26.
作者简介: 杨永清(1965—),男,博士,教授,博士生导师, lishiwei1987@my.swjtu.edu.cn.
基金项目: 铁道部科技研究开发计划重大课题资助项目(2008G031-K).
引用本文: 杨永清,李世伟,蒲黔辉,等.大跨悬浇箱梁桥三维非线性收缩徐变效应[J].东南大学学报(自然科学版),2018,48(6):1036-1043. DOI:10.3969/j.issn.1001-0505.2018.06.008.
更新日期/Last Update: 2018-11-20