环形超长混凝土结构温度应力及控制研究
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摘要
本文首先总结了国内外关于超长混凝土结构温度应力的研究现状,并简要地介绍了温度应力的弹性力学及有限元理论。其次介绍了混凝土结构的温度作用与时随特性。通过对混凝土时随特性的分析,提出了计算温度应力、应变时温度荷载的取值方法。为准确求解结构温度应力、应变提供了理论基础。
目前超长结构的研究主要集中在平面布置为矩形的结构上,对环形的超长结构研究的较少。本文建立一个环形超长结构基本模型,通过分析该模型在温降下的温度应力得出环形超长结构温度应力的特点。通过建立不同半径、不同环带宽度、不同约束条件的模型,分析在相同温降下这些因素对环形超长结构温度应力的影响。通过建立与环形超长结构对应的矩形超长结构模型,分析了环形超长结构与矩形超长结构的区别。通过对各种温度应力控制措施的研究,并比较环形超长结构与矩形超长结构在施加预应力和设置后浇带作用下的异同,得出环形超长结构温度应力控制措施的特点。
结合一个实际的环形超长结构——淮北体育场的现场监测进行环形超长结构温度应力的分析。由监测温度数据分析得到混凝土的温度分布与日照和季节的相互关系。不受日照的室内结构,混凝土温度与当地气温变化基本一致,而受日照的室外露天结构温度较气温明显偏高。在计算时宜对室内、室外分开考虑。由监测温度数据分析可知,在预应力张拉后,径向和环向梁内的混凝土应变差数值明显降低,结构中有效的建立了预压应力,说明了预应力和后浇带在控制混凝土温度应力上的作用。
以淮北市体育场为例,详细具体的介绍了实际工程中温度应力、温度应变的计算方法。通过比较整体计算模型和考虑分块施工和温控措施的计算模型,分析了环形超长结构温度应力特点及各种温控措施的效果。最后对长期应变数据和理论计算数据进行了比较,分析了误差来源。
This thesis summarizes the status of super-long concrete structure at home and abroad on the temperature stress study. This thesis firstly summarizes the status of the study about the super-long concrete structure in the temperature stress at home and abroad.And it then-also introduces the temperature stress of elasticity and finite element theory at first. And it also introduces the elasticity and the finite element theory of the temperature stress. Second the concrete structure's temperature effect and the time-dependent character are explained. Secondly the temperature effect and the time-dependent characteristic of the concrete structure are explained. Through analyzing the time-dependent characteristic of the concrete, it puts forward a method to calculate the temperature load when analyzing the temperature stress and strain. This provides a theoretical basis to accurately calculate the temperature stress and strain of super-long structure.
Up to know the research of the super-long structure is mainly about the rectangular structure, less about the annular structure. This thesis analyzes an annular super-long structure model's temperature stress to find its characteristics. It establishes some models with different radiuses, ring bandwidths and bound=restrict conditions, then to interpret the effects of these factors to the annular super-long structure temperature stress when they are under the same temperature load. It tells the distinction between annular super-long structure and rectangular super-long structure by comparing the models between them. This essay through researching the control technique of super-long structure, comparing the differences of prestressing and post pouring-join in super-long structure, then reaches the control measures features of the annular super-long structure.
Based on an actual annular super-long structure--Huaibei stadium and its scene monitoring, this thesis explains the temperature stress of annular super-long structure. The data from the monitoring proves that the temperature distribution is affected by sunlight and season. In the indoor structure, concrete temperature changes are similar to the local temperature changes, and the concrete temperature in outdoor is significantly higher than the local temperature because of the sunshine, so we should separate the indoor and outdoor temperature when we are calculating the temperature load. The monitoring temperature data shows that radial and circumferential strain are decreased obviously, which means the prestress is effectively established, and it also displays the function of the prestressing and post pouring-join.
Taking Huaibei stadium for example, the Paper introduces how to calculate the temperature stress and strain in detail. By comparing the whole model and the block construction model, it analyzes the temperature stress's characteristics and the controlling techniques of the annular super-long structure. Finally, the thesis compares the long-term strain data and the theoretical calculations, and it shows the analysis of the error sources.
目前超长结构的研究主要集中在平面布置为矩形的结构上,对环形的超长结构研究的较少。本文建立一个环形超长结构基本模型,通过分析该模型在温降下的温度应力得出环形超长结构温度应力的特点。通过建立不同半径、不同环带宽度、不同约束条件的模型,分析在相同温降下这些因素对环形超长结构温度应力的影响。通过建立与环形超长结构对应的矩形超长结构模型,分析了环形超长结构与矩形超长结构的区别。通过对各种温度应力控制措施的研究,并比较环形超长结构与矩形超长结构在施加预应力和设置后浇带作用下的异同,得出环形超长结构温度应力控制措施的特点。
结合一个实际的环形超长结构——淮北体育场的现场监测进行环形超长结构温度应力的分析。由监测温度数据分析得到混凝土的温度分布与日照和季节的相互关系。不受日照的室内结构,混凝土温度与当地气温变化基本一致,而受日照的室外露天结构温度较气温明显偏高。在计算时宜对室内、室外分开考虑。由监测温度数据分析可知,在预应力张拉后,径向和环向梁内的混凝土应变差数值明显降低,结构中有效的建立了预压应力,说明了预应力和后浇带在控制混凝土温度应力上的作用。
以淮北市体育场为例,详细具体的介绍了实际工程中温度应力、温度应变的计算方法。通过比较整体计算模型和考虑分块施工和温控措施的计算模型,分析了环形超长结构温度应力特点及各种温控措施的效果。最后对长期应变数据和理论计算数据进行了比较,分析了误差来源。
This thesis summarizes the status of super-long concrete structure at home and abroad on the temperature stress study. This thesis firstly summarizes the status of the study about the super-long concrete structure in the temperature stress at home and abroad.And it then-also introduces the temperature stress of elasticity and finite element theory at first. And it also introduces the elasticity and the finite element theory of the temperature stress. Second the concrete structure's temperature effect and the time-dependent character are explained. Secondly the temperature effect and the time-dependent characteristic of the concrete structure are explained. Through analyzing the time-dependent characteristic of the concrete, it puts forward a method to calculate the temperature load when analyzing the temperature stress and strain. This provides a theoretical basis to accurately calculate the temperature stress and strain of super-long structure.
Up to know the research of the super-long structure is mainly about the rectangular structure, less about the annular structure. This thesis analyzes an annular super-long structure model's temperature stress to find its characteristics. It establishes some models with different radiuses, ring bandwidths and bound=restrict conditions, then to interpret the effects of these factors to the annular super-long structure temperature stress when they are under the same temperature load. It tells the distinction between annular super-long structure and rectangular super-long structure by comparing the models between them. This essay through researching the control technique of super-long structure, comparing the differences of prestressing and post pouring-join in super-long structure, then reaches the control measures features of the annular super-long structure.
Based on an actual annular super-long structure--Huaibei stadium and its scene monitoring, this thesis explains the temperature stress of annular super-long structure. The data from the monitoring proves that the temperature distribution is affected by sunlight and season. In the indoor structure, concrete temperature changes are similar to the local temperature changes, and the concrete temperature in outdoor is significantly higher than the local temperature because of the sunshine, so we should separate the indoor and outdoor temperature when we are calculating the temperature load. The monitoring temperature data shows that radial and circumferential strain are decreased obviously, which means the prestress is effectively established, and it also displays the function of the prestressing and post pouring-join.
Taking Huaibei stadium for example, the Paper introduces how to calculate the temperature stress and strain in detail. By comparing the whole model and the block construction model, it analyzes the temperature stress's characteristics and the controlling techniques of the annular super-long structure. Finally, the thesis compares the long-term strain data and the theoretical calculations, and it shows the analysis of the error sources.
引文
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[3]樊小卿,吴为.武汉国际会展中心的温度作用设计[J].建筑结构,2002,(01).
[4]Podolny,W.Jr.The cause of cracking in post-tensioned concrete box girder bridges and retrofit procedures[J].PCI Journal,1985,Vol.30.No.2.
[5]刘兴法.预应力箱梁温度应力计算方法[J].土木工程学报,1986(1),44-54.
[6]Zuk,W.Thermal and Shrinkage Stresses in Composite Beams[J].ACI Journal.1961,Vol.58.
[7]刘兴法.混凝土结构的温度应力分析[M].人民交通出版社.1991.
[8]凯尔别克.太阳辐射对桥梁结构的影响[M].中国铁道出版社.1981.
[9]Dfger,W.H./Ghali,A./Chan,M./Cheung,M.S./Maes,M.A.:Temperature stresses in composite box girder bridges[J].Journal of Structural Engineering,ASCE,1983,Vol.109,No.6.
[10]Elbadry,M.M/Ghali,A.:Temperature variations in concrete bridges[J].Journal of Structural Engineering,ASCE,1983,Vol.109,No.10.
[11]金伟良,叶甲淳等.考虑太阳辐射作用的砌体结构的温度场[J].浙江大学学报(工学版),2002,36(5):577-581.
[12]梅甫良.混凝土结构非稳态温度场的新解法[J].水利学报,2002,(9):74-76.
[13]刘宁,刘光廷.大体积混凝土结构温度场的随机有限元算法[J].清华大学学报(自然科学版),1996,36(1):41-47.
[14]Chen H-T,Lin J-Y.Application of the hybrid method to transient heat conduction in one-dimensionalco mpositela yers[J].Computersa ndS tructures.1991,39(5):451-458.
[15]B.A Price and T.ESmith.Thermal response of composite building envelopes account for thermalr adiation[J].Energy Convers Mgrnt.1995,36(1):23-33.
[16]Sami AAl-Sanea.Thermal performance of building roof elements[J].Building and Enviroment.2002,37(7):665-675.
[17]魏光坪.单室预应力混凝土箱梁温度场及温反应力研究[J].西南交通人学学报,1989(4).
[18]王铁梦.工程结构裂缝控制[M].北京:中国建筑工业出版社,1997
[19]樊小卿.温度作用与结构设计[J].建筑结构学报,1999,20(2):43-50.
[20]戴国强.混凝上收缩温度应力及构造措施[J].建筑结构,1997,(1):8-11.
[21]刘开国.超长框架温度变形与温度应力[J].建筑结构,2000,30(2):36-40.
[22]李志磊,干钢,唐锦春.考虑辐射换热的建筑结构温度场的数值模拟[J].浙江大学学报(工学版),2004,38(7):915-920.
[23]叶甲淳.混凝土小型空心砌块建筑裂缝控制的温度效应研究[D].浙江大学博士学位论文,2003年5月.
[24]冯健,吕志涛等.超长混凝土结构的研究和应用[J].建筑结构学报,2001,22(6):14-19.
[25]韩重庆.大面积预应力混凝土梁板结构不设温度缝研究[D].东南大学硕士学位论文,2001年3月.
[26]郝志军,钱英欣等.超长混凝土板内无粘结预应力温度配筋分析[J]施工技术.2001,30(7):25-27.
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