新老混凝土缝面切向刚度早龄期发展规律
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摘要
由于缺乏新老混凝土缝面早龄期力学性能发展规律的研究,一般认为大体积混凝土浇筑块间歇面强度与浇筑块相同,由此导致间歇面上下层新老混凝土相互约束偏大,从而使浇筑块内部的应力计算值偏大。设计了新老混凝土缝面早龄期剪切试验,获取了需要的参数历时曲线,然后将该成果应用到实际混凝土坝工程的施工期温度场和应力场仿真计算。计算结果表明,在间歇面上设置缝面单元,并考虑其早龄期强度发展,可以相对合理地模拟约束情况,计算得到的浇筑块拉应力值相对较小,更符合实际情况。
Due to the lack of research on the development rule of early age mechanical properties of new and old concrete joint faces,the strength of the joint face is generally considered to be the same as that of pouring blocks,which leads to large mutual restraint of new and old concrete on the intermittent surface,and further causes a relatively large stress calculation value in the pouring block. In this paper,an experiment is designed to test the early-age shear stiffness of new and old concrete joint faces,and the required parameter duration curve is obtained.Then the test results are applied to the simulation of temperature field and stress field during the construction period of the actual concrete dams. The results show that when the joint face elements considering the early age strength development are set on the intermittent surface,the constraint condition of new and old concrete joint faces can be reasonably simulated. The calculated tensile stress of the pouring block is relatively small,which is more in line with the actual phenomenon.
Due to the lack of research on the development rule of early age mechanical properties of new and old concrete joint faces,the strength of the joint face is generally considered to be the same as that of pouring blocks,which leads to large mutual restraint of new and old concrete on the intermittent surface,and further causes a relatively large stress calculation value in the pouring block. In this paper,an experiment is designed to test the early-age shear stiffness of new and old concrete joint faces,and the required parameter duration curve is obtained.Then the test results are applied to the simulation of temperature field and stress field during the construction period of the actual concrete dams. The results show that when the joint face elements considering the early age strength development are set on the intermittent surface,the constraint condition of new and old concrete joint faces can be reasonably simulated. The calculated tensile stress of the pouring block is relatively small,which is more in line with the actual phenomenon.
引文
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[9]胡智农,徐斌,张霞林,等.喷射硅粉混凝土(砂浆)在船闸修补中的应用[J].水利水运工程学报,2005(3):50-53.(HUZhinong,XU Bin,ZHANG Xialin,et al.Application of shotcrete(mortar)in lock repair[J].Hydro-Science and Engineering,2005(3):50-53.(in Chinese))
[10]DYBEL P,WALACH D.Evaluation of the development of bond strength between two concrete layers[J].IOP Conference Series:Materials Science and Engineering,2017,245(3).DOI:10.1088/1757-899X/245/3/032056
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[12]WANG X H,ZHANG Y,LUO J H.The experiment study on adherence capability between new and old concrete of pavement[J].Advanced Materials Research,2014,853:151-154.
[13]何伟.新老混凝土界面粘结强度的研究[D].长沙:湖南大学,2005.(HE Wei.The research on the interfacial bond strength of new-to-old concrete[D].Changsha:Hunan University,2005.(in Chinese))
[14]潘传银,石雪飞,周可攀.新、老混凝土粘结抗剪强度试验[J].交通科学与工程,2014,30(2):6-12.(PAN Chuanyin,SHI Xuefei,ZHOU Kepan.Study on shear strength of new and old concrete bonding interface[J].Journal of Transport Science and Engineering,2014,30(2):6-12.(in Chinese))
[15]赵联桢,杨平,刘成.混凝土早期力学性能试验研究[J].水利水运工程学报,2013(1):35-40.(ZHAO Lianzhen,YANG Ping,LIU Cheng.A study of concrete early mechanical properties[J].Hydro-Science and Engineering,2013(1):35-40.(in Chinese))
[16]杨锐.水工大体积混凝土早龄期缝面强度问题研究[D].南京:河海大学,2016.(YANG Rui.Research on joint face strength problem of early-age mass concrete structures[D].Nanjing:Hohai University,2016.(in Chinese))
[17]强晟,杨锐,娄二召,等.一种获取混凝土间歇面早龄期剪切强度历时曲线的方法:CN201610346262.2[P].2016-05-24.(QIANG Sheng,YANG Rui,LOU Erzhao,et al.A method to obtain the shear strength duration curve of the jont face of concrete at early age:CN201610346262.2[P].2016-05-24.(in Chinese))
[18]张南南.混凝土结构施工期仿真计算中的小变形接触问题研究[D].南京:河海大学,2014.(ZHANG Nannan.Research on contact problem of small deformation for concrete structure in construction simulation[D].Nanjing:Hohai University,2014.(in Chinese))
[2]吴康振.新老混凝土粘结性能问题研究及有限元分析[D].成都:西华大学,2012.(WU Kangzhen.The reasearch of binding performance of new and old concrete and finite element analysis[D].Chengdu:Xihua University,2012.(in Chinese))
[3]孙林松,王德信,谢能刚.接触问题有限元分析方法综述[J].水利水电科技进展,2001,21(3):18-20,68-69.(SUNLinsong,WANG Dexin,XIE Nenggang.A survey of finite element analysis for contact problems[J].Advances in Science and Technology of Water Resources,2001,21(3):18-20,68-69.(in Chinese))
[4]朱伯芳.大体积混凝土温度应力与温度控制[M].2版.北京:中国水利水电出版社,2012.(ZHU Bofang.Temperature stress and temperature control of mass concrete[M].2nd Ed.Beijing:China Water Power Press,2012.(in Chinese))
[5]张子明,郑国芳,宋智通.基于等效时间的早期混凝土温度裂缝分析[J].水利水运工程学报,2004(01):41-44.(ZHANGZiming,ZHENG Guofang,SONG Zhitong.Temperature crack analysis of early concrete based on equivalent time[J].HydroScience and Engineering,2004(1):41-44.(in Chinese))
[6]赵志方,周厚贵,刘健,等.新老混凝土粘结复合受力的强度特性[J].工业建筑,2002(10):37-39,62.(ZHAOZhifang,ZHOU Hougui,LIU Jian,et al.Adhesive strength behavior of young on old concrete under biaxial stresses[J].Industrial Construction,2002(10):37-39,62.(in Chinese))
[7]袁群,刘健.新老混凝土粘结的剪切强度研究[J].建筑结构学报,2001,22(2):46-50.(YUAN Qun,LIU Jian.Study on adhesive shear strength of young on old concrete[J].Journal of Building Structures,2001,22(2):46-50.(in Chinese))
[8]LI G Y,XIE H C,XIONG G J.Transition zone studies of new-to-old concrete with different binders[J].Cement and Concrete Composites,2001,23(4/5):381-387.
[9]胡智农,徐斌,张霞林,等.喷射硅粉混凝土(砂浆)在船闸修补中的应用[J].水利水运工程学报,2005(3):50-53.(HUZhinong,XU Bin,ZHANG Xialin,et al.Application of shotcrete(mortar)in lock repair[J].Hydro-Science and Engineering,2005(3):50-53.(in Chinese))
[10]DYBEL P,WALACH D.Evaluation of the development of bond strength between two concrete layers[J].IOP Conference Series:Materials Science and Engineering,2017,245(3).DOI:10.1088/1757-899X/245/3/032056
[11]王振领.新老混凝土粘结理论与试验及在桥梁加固工程中的应用研究[D].成都:西南交通大学,2007.(WANGZhenling.Study on bond theory and test of new and old concrete and its application in bridge strengthening engineering[D].Chengdu:Southwest Jiaotong University,2007.(in Chinese))
[12]WANG X H,ZHANG Y,LUO J H.The experiment study on adherence capability between new and old concrete of pavement[J].Advanced Materials Research,2014,853:151-154.
[13]何伟.新老混凝土界面粘结强度的研究[D].长沙:湖南大学,2005.(HE Wei.The research on the interfacial bond strength of new-to-old concrete[D].Changsha:Hunan University,2005.(in Chinese))
[14]潘传银,石雪飞,周可攀.新、老混凝土粘结抗剪强度试验[J].交通科学与工程,2014,30(2):6-12.(PAN Chuanyin,SHI Xuefei,ZHOU Kepan.Study on shear strength of new and old concrete bonding interface[J].Journal of Transport Science and Engineering,2014,30(2):6-12.(in Chinese))
[15]赵联桢,杨平,刘成.混凝土早期力学性能试验研究[J].水利水运工程学报,2013(1):35-40.(ZHAO Lianzhen,YANG Ping,LIU Cheng.A study of concrete early mechanical properties[J].Hydro-Science and Engineering,2013(1):35-40.(in Chinese))
[16]杨锐.水工大体积混凝土早龄期缝面强度问题研究[D].南京:河海大学,2016.(YANG Rui.Research on joint face strength problem of early-age mass concrete structures[D].Nanjing:Hohai University,2016.(in Chinese))
[17]强晟,杨锐,娄二召,等.一种获取混凝土间歇面早龄期剪切强度历时曲线的方法:CN201610346262.2[P].2016-05-24.(QIANG Sheng,YANG Rui,LOU Erzhao,et al.A method to obtain the shear strength duration curve of the jont face of concrete at early age:CN201610346262.2[P].2016-05-24.(in Chinese))
[18]张南南.混凝土结构施工期仿真计算中的小变形接触问题研究[D].南京:河海大学,2014.(ZHANG Nannan.Research on contact problem of small deformation for concrete structure in construction simulation[D].Nanjing:Hohai University,2014.(in Chinese))