多因素作用下的旧拱桥主拱肋受力分析及加固研究
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摘要
以服役近20 a的某下承式系杆拱桥的病害检测为基础,研究了冲击系数、损伤折减和活载超载等因素对主拱肋受力性能的影响,采用了拱脚增大截面和拱肋关键截面黏贴钢板的方法对主拱肋进行加固。结果表明:冲击系数、损伤折减和活载超载均对拱肋受力有较大影响,其最不利于拱肋截面的安全系数相对于原荷载设计工况分别下降了22%,54%和50%,且拱肋承载力不满足要求的截面增多。通过对主拱肋的加固,拱肋承载能力均能满足设计要求,可对类似服役期拱桥加固提供参考。
The structural performance of arch bridge serviced 20 years was inspected and its risk was analyzed. The effects of multi-factors( i. e. impact coefficient,capacity reduction by damages,and overloading of live loads) on the bridge performance was considered. The arch was strengthened by increasing section size of the footing and bonding steel plates at critical sections along the arch. The results show that impact coefficient,damage,and overloading significantly affected structural performance of the arch. Compared with the original design,the negative effects of safety indicator of the sections reduced by 22%,54%,and 50% respectively.Meanwhile,more sections of the arch could meet with the requirement of structural capacity. Through the strengthening,the loading capacity of all sections met the design requirements. The study provided a reference for rehabilitation of arch bridges.
The structural performance of arch bridge serviced 20 years was inspected and its risk was analyzed. The effects of multi-factors( i. e. impact coefficient,capacity reduction by damages,and overloading of live loads) on the bridge performance was considered. The arch was strengthened by increasing section size of the footing and bonding steel plates at critical sections along the arch. The results show that impact coefficient,damage,and overloading significantly affected structural performance of the arch. Compared with the original design,the negative effects of safety indicator of the sections reduced by 22%,54%,and 50% respectively.Meanwhile,more sections of the arch could meet with the requirement of structural capacity. Through the strengthening,the loading capacity of all sections met the design requirements. The study provided a reference for rehabilitation of arch bridges.
引文
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[2]西部交通建设科技项目可行性研究报告.混凝土梁式桥损伤评估与安全可靠性评价技术研究[R].交通部公路科学研究院,2005.RESEARCH INSTITUTE OF HIGHWAY MINISTRY OF TRANSPORT. Research on damage assessment and safety reliability evaluation of concrete beam bridge[R]. Feasibility Study Report of Western Transportation Construction Technology Project,2005.
[3]姚继涛,马永欣,董振平,等.建筑物可靠性鉴定和加固[M].北京:科学出版社,2003.YAO J T,MA Y X,DONG Z P,et al. Building reliability assessment and reinforcement[M]. Beijijng:Science Press,2003.
[4] VIDA R,HALVONIK J. Shear assessment of concrete bridge deck slabs[J]. Key Engineering Materials,2017,738:110-119.
[5] VALERIO P,IBELL T J. Shear strengthening of existing concrete bridges[J]. Structures&Buildings,2003,156:75-84.
[6] SINGH H. Assessment and strengthening of Buncer Lane Bridge,Blackburn,United Kingdom[J]. Structural Engineering International,2015,25(2):101-108.
[7]顾长青.荷塘西江大桥下承式体外系杆拱拱肋加固受力分析[J].交通科技. 2018(5):71-73.GU C Q. Stress analysis of arch rib reinforcement of bar arch in vitro under Hetang Xijiang Bridge[J]. Transportation Science&Technology. 2018(5):71-73.
[8]陆新征,张炎圣,黄圣楠,等.基于非线性有限元和快速建模的桥梁承载力预测[J].兰州交通大学学报,2009,28(4):12-14.LU X Z,ZHANG Y S,HUANG S N,et al. Prediction of bridge bearing capacity based on high-precision nonlinear finite element analysis and fast modeling technology[J]. Journal of Lanzhou Jiaotong University,2009,28(4):12-14.
[9]吕毅刚,张建仁,彭晖,等.基于雷达图的既有钢筋混凝拱肋承载力评定[J].公路交通科技,2011,28(7):79-83.LU Y G,ZHANG J R,PENG H,et al. Evaluation of bearing capacity of existing reinforced concrete arch rib based on radar chart[J]. Journal of Highway and Transportation Research and Development,2011,28(7):79-83.
[10] KUSHIDA M,MIYAMOTO A,KINOSHITA K. Develoment of concrete bridge rating prototype expert system with machine learning[J],Journal of Computing in Civil Engineering,1997,11(4):238-247.
[11]张海龙.钢筋混凝土结构极限承载力分析的非线性有限元法[D].西安:长安大学,2005.ZHANG H L. Nonlinear finite element method for ultimate bearing capacity analysis of reinforced concrete structures[D]. Xi'an∶Chang'an university,2005.
[12] BEKTAS B,CARRIQUIRY A,SMADI. Using classification trees for predicting national bridge inventory condition ratings[J]. Journal of Infrastructure Systems,2013,19(4):425-433.
[13]中华人民共和国交通部.公路桥涵设计通用规范(JTJ 021—89)[S].北京:人民交通出版社,1989.MINISTRY OF TRANSPORT OF THE PEOPLE'S REPUBLIC OF CHINA. General code for design of highway bridges and culverts(JTJ021—89)[S]. Beijing:China Communications Press,1989.
[14]中华人民共和国交通部.公路钢筋混凝土及预应力混凝土桥涵设计规范(JTJ 023—85)[S].北京:人民交通出版社,1985.MINISTRY OF TRANSPORT OF THE PEOPLE'S REPUBLIC OF CHINA. Code for design of highway reinforced concrete and prestressed concrete bridges and culverts(JTJ023—85)[S]. Beijing:China Communications Press,1985.
[15]中华人民共和国交通部.公路桥梁承载能力检测评定规程(JTG/TJ21—2011)[S].北京:人民交通出版社,2011.MINISTRY OF TRANSPORT OF THE PEOPLE'S REPUBLIC OF CHINA. Specification for inspection and evaluation of load-bearing capacity of highway bridges(JTG/TJ21—2011)[S]. Beijing:China Communications Press,2011.