预应力混凝土箱型梁施工过程应力场数值模拟
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摘要
为研究混凝土箱型梁施工过程中的水泥水化放热问题,以秦沈客运专线某箱型梁为原型,应用ABAQUS有限元软件建立三维计算模型,对应力场计算结果进行分析。研究发现,在箱梁早期凝结硬化过程中,水泥水化反应使得箱梁整体发生膨胀,产生温度应力,且底板、腹板、顶板处的温度应力变化规律大致相同,均在12~24 h内到达峰值;但各部位应力的大小不同,应力较大位置分别位于腹板与底板、腹板与顶板的交汇处,最大温度应力0.50 MPa,没有超过规定的抗拉强度,符合工程实际情况。
In order to study the cement hydration heat problem of the concrete box girder in construction process,a 3D calculation model of a box type girder is established in Qin-Shen passenger dedicated line using ABAQUS.The analysis on the stress field calculation results shows that the cement hydration reaction will make the box girder integral expansion and cause temperature stress in early hardening process of the box girder.Moreover,the regular variation of the temperature stress at the bottom slab,the web and the top slab will experience three same phases,which will reach the peak within 12 ~ 24 hours.The stress values in different positions,however,are different.The stress in the confluence of the web and the bottom,and the stress in the confluence of the web and the top slab are larger.The maximum thermal stress is 0.50 MPa,which is less than the stipulated tensile strength and is complied with the engineering actual situation.
In order to study the cement hydration heat problem of the concrete box girder in construction process,a 3D calculation model of a box type girder is established in Qin-Shen passenger dedicated line using ABAQUS.The analysis on the stress field calculation results shows that the cement hydration reaction will make the box girder integral expansion and cause temperature stress in early hardening process of the box girder.Moreover,the regular variation of the temperature stress at the bottom slab,the web and the top slab will experience three same phases,which will reach the peak within 12 ~ 24 hours.The stress values in different positions,however,are different.The stress in the confluence of the web and the bottom,and the stress in the confluence of the web and the top slab are larger.The maximum thermal stress is 0.50 MPa,which is less than the stipulated tensile strength and is complied with the engineering actual situation.
引文
[1]SUN W G,LIU L J,WU Q H.Experimental research on hydration heat temperature of concrete box girder in low-temperature environment[J].Applied Mechanics and Materials,2013,470(8):1045-1050.
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[3]雷家艳,季文玉,卢文良,等.秦沈客运专线箱梁水化热温度、应变变化及裂缝控制[J].北方交通大学学报,2002,26(1):85-87.
[4]DU G Q,SHI D H.Numerical simulation of the precast concrete box girders temperature field distribution based on material properties[J].Advanced Materials Research,2013,703(6):221-224.
[5]YANG M L,MA T K.Hydration heat and solar radiation effect research of box girder[J].Applied Mechanics and Materials,2012,170(5):2568-2573.
[6]朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国电力出版社,1999:163-165.
[7]CHEN B G,DING R,ZHENG J J,et al.Field test on temperature field and thermal stress for prestressed concrete box-girder bridge[C].Frontiers of Architecture and Civil Engineering in China.Springer Verlag,2009,3(2):158-164.
[8]刘芳平,周建庭,宋军,等.悬臂施工过程中箱梁水化热温度场研究[J].施工技术,2013,42(11):97-100.
[9]黄梦露,柳艳杰,丁琳,等.高强混凝土抗压强度的试验研究[J].黑龙江大学工程学报,2015,6(2):26-29.
[10]内维尔.混凝土的性能[M].北京:中国建筑工业出版社,1983:182-190.
[11]冯德飞,卢文良.混凝土箱梁水化热温度试验研究[J].铁路工程学报,2006,98(8):62-67.
[12]王铁梦.建筑物的裂缝控制[M].上海:上海科学技术出版社,1987:95-101.
[13]杨璐,陈玳珩,沈新普.高速公路防护栏支柱的水平基床反力[J].沈阳工业大学学报,2010,32(1):115-120.
[2]张智晖.预应力混凝土箱梁时变温度场及其效应研究[D].西安:长安大学,2010:33-38.
[3]雷家艳,季文玉,卢文良,等.秦沈客运专线箱梁水化热温度、应变变化及裂缝控制[J].北方交通大学学报,2002,26(1):85-87.
[4]DU G Q,SHI D H.Numerical simulation of the precast concrete box girders temperature field distribution based on material properties[J].Advanced Materials Research,2013,703(6):221-224.
[5]YANG M L,MA T K.Hydration heat and solar radiation effect research of box girder[J].Applied Mechanics and Materials,2012,170(5):2568-2573.
[6]朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国电力出版社,1999:163-165.
[7]CHEN B G,DING R,ZHENG J J,et al.Field test on temperature field and thermal stress for prestressed concrete box-girder bridge[C].Frontiers of Architecture and Civil Engineering in China.Springer Verlag,2009,3(2):158-164.
[8]刘芳平,周建庭,宋军,等.悬臂施工过程中箱梁水化热温度场研究[J].施工技术,2013,42(11):97-100.
[9]黄梦露,柳艳杰,丁琳,等.高强混凝土抗压强度的试验研究[J].黑龙江大学工程学报,2015,6(2):26-29.
[10]内维尔.混凝土的性能[M].北京:中国建筑工业出版社,1983:182-190.
[11]冯德飞,卢文良.混凝土箱梁水化热温度试验研究[J].铁路工程学报,2006,98(8):62-67.
[12]王铁梦.建筑物的裂缝控制[M].上海:上海科学技术出版社,1987:95-101.
[13]杨璐,陈玳珩,沈新普.高速公路防护栏支柱的水平基床反力[J].沈阳工业大学学报,2010,32(1):115-120.