【作者】 卢宇航；

【导师】 郑毅敏；

【作者基本信息】 同济大学 ， 结构工程， 2008， 硕士

【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。更多还原

【Abstract】 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.更多还原