新老桥间超高性能混凝土拼接接缝性能试验
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摘要
依托上海市济阳路高架新老桥拼接项目进行了基于高应变强化超高性能混凝土(UHPC)材料的拼接缝试验.试验采用非对称加载,目的是模拟新老桥的不均匀沉降.试验结果表明,UHPC拼缝整个受力破坏的过程大致可以分为3个阶段:弹性阶段、裂缝发展阶段、持荷至破坏阶段.在UHPC板下缘首先出现裂缝,之后UHPC板侧面出现大量微小裂缝,裂缝均以微裂缝簇的方式呈现,裂缝宽度发展缓慢,且沿着板高向上发展.UHPC转角为1.2%时裂缝宽度仅为0.16 mm,具有出色的裂缝控制能力.最终,UHPC板底出现主裂缝,横向钢筋和门筋屈服,钢筋布置方式满足试件破坏形态要求,说明试件的配筋合理.结合有限元模型对试验进行模拟,吻合度较高.利用有限元进行参数分析,发现增加接缝自由长度和减小接缝厚度可以有效增强接缝弯曲性能.由于UHPC材料进行接缝施工具有方便、快捷、性能优越等优点,提出基于上下部构造不连接类型的接缝形式,并给出具体配筋方案.
Based on the bridge-stitching project of Jiyang viaduct, Shanghai, an experiment was conducted on high-strain hardening ultra-high-performance concrete(UHPC) stitching joints. Asymmetrical loading was used to simulate the bridge uneven settlement in the experiment. The experiment results show that the entire process can be divided into three stages: elastic stage, cracks developing stage and failure stage. First, cracks appear under the UHPC panels; then, many micro cracks appear on the side of the UHPC panels. The cracks appear in the form of micro-crack clusters, and the crack width slowly increases. When the UHPC panel rotation is 1.2%, the crack width is 0.16 mm, so the UHPC has excellent crack-control ability. In the end, the main crack appears at the bottom of the UHPC panels, and the transverse reinforcements yield because the reinforcement layout satisfies the requirements of the failure mode of the specimen. Thus, the reinforcement arrangement of the specimen is reasonable. The experiment was simulated using the finite-element model, and the results were coordinated with experiment results. The parameter analysis was carried out by the finite element method, and the results show that increasing joint free length and reducing joint thickness can effectively enhance the bending performance of joints. Because the advantages of the UHPC joint are convenience, rapidity, and excellent performance, a joint form based on the type of non-connection of upper and lower structures is put forward. What's more, a detailed reinforcement scheme is given, which will serve as a reference for similar projects in the future.
Based on the bridge-stitching project of Jiyang viaduct, Shanghai, an experiment was conducted on high-strain hardening ultra-high-performance concrete(UHPC) stitching joints. Asymmetrical loading was used to simulate the bridge uneven settlement in the experiment. The experiment results show that the entire process can be divided into three stages: elastic stage, cracks developing stage and failure stage. First, cracks appear under the UHPC panels; then, many micro cracks appear on the side of the UHPC panels. The cracks appear in the form of micro-crack clusters, and the crack width slowly increases. When the UHPC panel rotation is 1.2%, the crack width is 0.16 mm, so the UHPC has excellent crack-control ability. In the end, the main crack appears at the bottom of the UHPC panels, and the transverse reinforcements yield because the reinforcement layout satisfies the requirements of the failure mode of the specimen. Thus, the reinforcement arrangement of the specimen is reasonable. The experiment was simulated using the finite-element model, and the results were coordinated with experiment results. The parameter analysis was carried out by the finite element method, and the results show that increasing joint free length and reducing joint thickness can effectively enhance the bending performance of joints. Because the advantages of the UHPC joint are convenience, rapidity, and excellent performance, a joint form based on the type of non-connection of upper and lower structures is put forward. What's more, a detailed reinforcement scheme is given, which will serve as a reference for similar projects in the future.
引文
[1] 刘桂琴,崔展.新技术新材料在桥梁改建工程中的应用[J].桥梁建设, 2000, 65(4):65. LIU Guiqin, CUI Zhan. The application of new technics and new materials in the rehabilitation of the existing bridges[J]. Bridge Construction, 2000, 65(4):65.
[2] 吴文清,叶见曙,鞠金荧,等.高速公路扩建中桥梁拓宽现状与方案分析[J].中外公路,2007, 27(6):100. WU Wenqing, YE Jianshu, JU Jinying, et al. Current situation and scheme analysis of bridge widening in expressway expansion[J]. Journal of China & Foreign Highway, 2007, 27(6):100.
[3] 王宗华. 高速公路桥梁加宽拼接技术优化研究[D].长安: 长安大学,2009. WANG Zonghua. Study on optimization of highway bridges broaden splicing technology[D]. Changan: Chang’an University, 2009.
[4] 周明利.高速公路桥梁拓宽中的问题[J].交通世界,2017, 58(1):136. ZHOU Mingli. Problems in the widening of highway bridges[J]. Transpo World, 2017, 58(1):136.
[5] 刘东明.高速公路改扩建工程新旧桥梁拼宽施工工艺[J].交通世界,2018,63(1):136. LIU Dongming. Construction technology for widening old and new bridges in expressway reconstruction project[J]. Transpo World, 2018,63(1):136.
[6] 宗周红,夏樟华,陈宜言,等.既有桥梁拓宽改造纵向接缝研究现状与实例分析[J].福州大学学报(自然科学版),2009,37(2):248. ZONG Zhouhong, XIA Zhanghua, CHEN Yiyan, et al. State-of-the-art and engineering example analysis of longitudinal connection joints between the new bridges and existing old bridges during bridge widening and reconstructions [J]. Journal of Fuzhou University (Natural Science Edition), 2009,37(2):248.
[7] 马春生,宋神友.广佛高速公路湖洲大桥主桥新旧结构连接设计[J].公路,2003,63(8):63. MA Chunsheng, SONG Shenyou. Design of connection between new beam and old one of huzhou bridge on guangfo expressway[J]. Highway, 2003, 63(8):63.
[8] 左永辉. 新材料在桥梁拼接中的应用研究[D].南京:东南大学,2017. ZUO Yonghui. Research the application of new materials in a bridge concatenation[D]. Nanjing: Southeast University, 2017.
[9] GRAYBEAL B A. UHPC in the US highway infrastructure[J]. Indian Concrete Journal, 2014, 88(4):84.
[10] PERRY V H, SEIBERT P J. The use of UHPFRC (Ductal?) for bridges in North America: The technology, applications and challenges facing commercialization[C]//Proceedings of Second International Symposium on Ultra High Performance Concrete. Kassel: University of Kassel, 2008: 815-822.
[11] 王俊颜,郭君渊,肖汝诚,等.高应变强化超高性能混凝土的裂缝控制机理和研究[J].土木工程学报,2017,50(11):10. WANG Junyan, GUO Junyuan, XIAO Rucheng, et al. Crack control mechanism and research on high strain reinforced super high performance concrete [J]. China Civil Engineering Journal,2017,50(11):10.
[12] 王俊颜,耿莉萍,郭君渊,等.UHPC的轴拉性能与裂缝宽度控制能力研究[J].哈尔滨工业大学学报,2017,49(12):165. WANG Junyan, GENG Liping, GUO Junyuan, et al. Experimental study on crack width control ability of ultra-high performance concrete[J]. Journal of Harbin Institute of Technology,2017,49(12):165
[13] 中华人民共和国住房和城乡建设部. 混凝土结构设计规范:GB 50010—2010[S]. 北京:中国建筑工业出版社, 2010. Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Concrete structure design code: GB 50010—2010 [S]. Beijing:China Architecture & Building Press, 2010.
[14] LAMPROPOULOS A P, PASCHALIS S A, TSIOULOU O T, et al. Strengthening of reinforced concrete beams using ultra high performance fibre reinforced concrete (UHPFRC)[J]. Engineering Structures, 2016, 106:370.
[2] 吴文清,叶见曙,鞠金荧,等.高速公路扩建中桥梁拓宽现状与方案分析[J].中外公路,2007, 27(6):100. WU Wenqing, YE Jianshu, JU Jinying, et al. Current situation and scheme analysis of bridge widening in expressway expansion[J]. Journal of China & Foreign Highway, 2007, 27(6):100.
[3] 王宗华. 高速公路桥梁加宽拼接技术优化研究[D].长安: 长安大学,2009. WANG Zonghua. Study on optimization of highway bridges broaden splicing technology[D]. Changan: Chang’an University, 2009.
[4] 周明利.高速公路桥梁拓宽中的问题[J].交通世界,2017, 58(1):136. ZHOU Mingli. Problems in the widening of highway bridges[J]. Transpo World, 2017, 58(1):136.
[5] 刘东明.高速公路改扩建工程新旧桥梁拼宽施工工艺[J].交通世界,2018,63(1):136. LIU Dongming. Construction technology for widening old and new bridges in expressway reconstruction project[J]. Transpo World, 2018,63(1):136.
[6] 宗周红,夏樟华,陈宜言,等.既有桥梁拓宽改造纵向接缝研究现状与实例分析[J].福州大学学报(自然科学版),2009,37(2):248. ZONG Zhouhong, XIA Zhanghua, CHEN Yiyan, et al. State-of-the-art and engineering example analysis of longitudinal connection joints between the new bridges and existing old bridges during bridge widening and reconstructions [J]. Journal of Fuzhou University (Natural Science Edition), 2009,37(2):248.
[7] 马春生,宋神友.广佛高速公路湖洲大桥主桥新旧结构连接设计[J].公路,2003,63(8):63. MA Chunsheng, SONG Shenyou. Design of connection between new beam and old one of huzhou bridge on guangfo expressway[J]. Highway, 2003, 63(8):63.
[8] 左永辉. 新材料在桥梁拼接中的应用研究[D].南京:东南大学,2017. ZUO Yonghui. Research the application of new materials in a bridge concatenation[D]. Nanjing: Southeast University, 2017.
[9] GRAYBEAL B A. UHPC in the US highway infrastructure[J]. Indian Concrete Journal, 2014, 88(4):84.
[10] PERRY V H, SEIBERT P J. The use of UHPFRC (Ductal?) for bridges in North America: The technology, applications and challenges facing commercialization[C]//Proceedings of Second International Symposium on Ultra High Performance Concrete. Kassel: University of Kassel, 2008: 815-822.
[11] 王俊颜,郭君渊,肖汝诚,等.高应变强化超高性能混凝土的裂缝控制机理和研究[J].土木工程学报,2017,50(11):10. WANG Junyan, GUO Junyuan, XIAO Rucheng, et al. Crack control mechanism and research on high strain reinforced super high performance concrete [J]. China Civil Engineering Journal,2017,50(11):10.
[12] 王俊颜,耿莉萍,郭君渊,等.UHPC的轴拉性能与裂缝宽度控制能力研究[J].哈尔滨工业大学学报,2017,49(12):165. WANG Junyan, GENG Liping, GUO Junyuan, et al. Experimental study on crack width control ability of ultra-high performance concrete[J]. Journal of Harbin Institute of Technology,2017,49(12):165
[13] 中华人民共和国住房和城乡建设部. 混凝土结构设计规范:GB 50010—2010[S]. 北京:中国建筑工业出版社, 2010. Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Concrete structure design code: GB 50010—2010 [S]. Beijing:China Architecture & Building Press, 2010.
[14] LAMPROPOULOS A P, PASCHALIS S A, TSIOULOU O T, et al. Strengthening of reinforced concrete beams using ultra high performance fibre reinforced concrete (UHPFRC)[J]. Engineering Structures, 2016, 106:370.