[1]张飞,*,黄福云,等.V型墩刚构桥悬浇施工中应变修正与应力监测[J].山东建筑大学学报,2020,35(03):36-41.[doi:10.12077/sdjz.2020.03.006]
 ZHANG Fei,*,HUANG Fuyun,et al.Strain correction and stress monitoring of rigid frame bridge with V-shaped pier in cantilever casting construction[J].Journal of Shandong jianzhu university,2020,35(03):36-41.[doi:10.12077/sdjz.2020.03.006]
点击复制

V型墩刚构桥悬浇施工中应变修正与应力监测()
分享到:

《山东建筑大学学报》[ISSN:1673-7644/CN:37-1449/TU]

卷:
35
期数:
2020年03期
页码:
36-41
栏目:
研究论文
出版日期:
2020-06-15

文章信息/Info

Title:
Strain correction and stress monitoring of rigid frame bridge with V-shaped pier in cantilever casting construction
文章编号:
1673-7644(2020)03-0036-06
作者:
张飞1*黄福云2王燕1
(1.福建江夏学院 工程学院,福建 福州 350108;2.福州大学 土木工程学院,福建 福州 350116)
Author(s):
ZHANG Fei1* HUANG Fuyun2 WANG Yan1
( 1. College of Engineering, Fujian Jiangxia University, Fuzhou 350108, China; 2. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China )
关键词:
V型墩刚构桥悬浇施工应变修正混凝土收缩徐变日照温差
Keywords:
rigid frame bridge with V-shaped pier cantilever casting construction strain correction shrinkage and creep of concrete sunshine temperature difference
分类号:
U442
DOI:
10.12077/sdjz.2020.03.006
文献标志码:
A
摘要:
桥梁悬浇施工中,从仪器记录的总应变中剔除非应力应变是获得结构真实应力的前提。文章以福建省一V型墩连续刚构桥为工程背景,分析混凝土收缩徐变、温度效应、应变计初值设定及混凝土弹性模量对应力监测的影响,提出了基于叠加法原理剔除混凝土收缩徐变应变的修正方法,研究日照温差作用引起截面产生温差自应力和应变的计算方法。结果表明:主梁根部截面应力的修正值与测读值之间的偏差为18%~26%,验证了应变修正的必要性;各控制截面修正后的实测应力与理论应力基本吻合,随施工过程的变化规律一致,验证了所用方法的有效性;主梁和V型腿各控制截面在施工中没有出现拉应力,而压应力满足规范限值;竖墩墩底截面在顶推工况下出现受拉区,应作为应力监测重点。
Abstract:
Eliminating the non-stress strain from the total strain recorded by instrument is a prerequisite for obtaining the true stress of the bridge in cantilever casting construction. A continuous rigid frame bridge with V-shaped pier in Fujian Province is taken as the engineering background. The effects of concrete shrinkage and creep, temperature effect, initial setting of strain gauges, and concrete elastic modulus on stress monitoring are analyzed. The correction method based on the principle of superposition is proposed to eliminate the strain caused by concrete shrinkage and creep. The calculation method of temperature difference stress and strain caused by the sunshine temperature difference is studied. The results show that the deviation between the corrected and measured value of the stress at the root of the main girder is 18% to 26%, which verifies the necessity of strain correction. The corrected stress of each control section is basically consistent with the theoretical stress, and the law of change with the construction process is consistent, which confirms the effectiveness of the method used. There is no tensile stress in the main girder and V-shaped bracing during construction, and the compressive stress meets the limit required by code. In the jacking condition, a tension zone appears at the bottom section of the pier, which should be the focus of stress monitoring.

参考文献/References:

[1]徐君兰. 大跨度桥梁施工控制[M]. 北京: 人民交通出版社, 2000. [2]于祥敏,陈德伟.贵黔高速鸭池河特大桥施工控制[J].桥梁建设,2019,49(2):109-113. [3]向木生, 张世飙, 张开银, 等. 大跨度预应力混凝土桥梁施工控制技术[J]. 中国公路学报, 2002,15(4): 41-45. [4]刘扬, 涂荣辉. 宜宾长江大桥主梁施工应力测试与分析[J]. 桥梁建设, 2008(2): 71-73,77. [5]余钱华. 大跨混凝土桥梁施工监控中的应力分析与测试[J]. 中国公路学报, 2008,21(2): 68-73. [6]程慧林. 灵江特大桥连续梁施工应力监控中消除温度影响的方法[J]. 铁道标准设计, 2009(8): 44-47. [7]向中富, 冉旭, 赖溧. 基于原位试验的桥梁施工过程应力修正[J]. 重庆交通大学学报(自然科学版), 2016,35(3): 6-10,21. [8]谢明志,杨永清,卜一之,等.千米级混合梁斜拉桥双目标控制施工监控体系[J].西南交通大学学报,2018,53(2):244-252,321. [9]宋福春, 张兴, 陈冲, 等. 大跨预应力混凝土连续梁桥悬臂施工结构控制分析[J]. 沈阳建筑大学学报(自然科学版), 2017, 33(2): 226-234. [10]窦文林,安康月.高速公路特大桥预应力连续梁桥悬臂施工控制研究[J].公路工程,2019,44(3):112-116. [11]唐超,周胜利,王解军.梅山龙宫资水大桥施工监控计算[J].公路工程,2019,44(6):151-153,165. [12]Bazant Z P, Baweja S. Creep and shrinkage prediction model for analysis and design of concrete structures: Model B3[J]. Materials and Structures, 1995, 180(28): 357-365. [13]Gardner N J, Zhao J W. Creep and shrinkage revisited[J]. ACI Materials Journal, 1993, 90(3): 236-246. [14]Malm R, Sundquist H. Timedependent analyses of segmentally constructed balanced cantilever bridges[J]. Engineering Structures, 2010, 32(4): 1038-1045. [15]毛江鸿, 陆飞, 张奕, 等. 基于试验的徐变模型修正及桥梁线型分析方法[J]. 重庆交通大学学报(自然科学版), 2019, 38(12): 38-44. [16]JTG 3362—2018, 公路钢筋混凝土及预应力钢筋混凝土桥涵设计规范[S]. 北京: 人民交通出版社, 2018. [17]薛刚, 孙晓燕, 白纬宇. 变截面连续箱梁桥温度场及其效应的有限元分析[J]. 辽宁工程技术大学学报(自然科学版), 2016, 35(10): 1132-1137. [18]肖新辉, 刘扬, 郭鑫, 等. 组合高墩大跨连续刚构桥箱梁日照温度场观测与效应分析[J]. 铁道科学与工程学报, 2014, 11(1): 10-16. [19]JTG D60—2015, 公路桥涵设计通用规范[S]. 北京: 人民交通出版社, 2015.

备注/Memo

备注/Memo:
收稿日期:2020-04-08 基金项目:国家自然科学基金项目(51578161);福建省教育厅教师科研项目(JAT170614)作者简介:张飞(1987-),男,讲师,硕士,主要从事大跨度预应力桥梁结构等方面的研究. E-mail:597586597@qq.com[*通讯作者]
更新日期/Last Update: 2020-06-17