超长混凝土地下室墙体中预应力作用计算与分析

发布时间：2018-03-10 09:23

本文选题：超长　切入点：混凝土墙体　出处：《建筑结构》2016年23期 　论文类型：期刊论文

【摘要】：超长混凝土墙体在降温、收缩等过程中,温度收缩应力超过混凝土的抗拉强度是引起墙体开裂的重要原因。以"地基上的长墙"作为计算模型,利用温度应力和预压应力在离开端部较远处为均布应力的假定,推导了预应力与温度、混凝土收缩共同作用下的墙体中应力计算公式。并用有限元软件ABAQUS进行了大量计算,验证了理论公式的可靠性和精确性。在应力计算公式的基础上,用极限变形的概念推导了裂缝间距的计算公式,此间距可作为施工缝和后浇带间距的计算依据。最后,根据后浇带的间距计算得到了一般情况下预应力筋的合理分段长度,可为今后超长混凝土墙体结构的理论分析和工程实践提供参考。
[Abstract]:In the process of cooling down and shrinkage of super-long concrete wall, the temperature shrinkage stress exceeds the tensile strength of concrete is the important reason to cause the wall crack. The "long wall on the foundation" is taken as the calculation model. Based on the assumption that the temperature stress and preloading stress are distributed in the distance from the end of the wall, a formula for calculating the stress in the wall under the joint action of prestress, temperature and concrete shrinkage is derived, and a large number of calculations are carried out with the finite element software ABAQUS. The reliability and accuracy of the theoretical formula are verified. On the basis of the stress calculation formula, the calculation formula of crack spacing is derived by using the concept of limit deformation, which can be used as the basis for calculating the spacing between construction joints and post-cast-in-place zones. The reasonable segmental length of prestressed tendons is obtained according to the calculation of the spacing of post-pouring strips, which can be used as a reference for the theoretical analysis and engineering practice of super-long concrete wall structures in the future.
【作者单位】：同济大学建筑工程系;同济大学先进土木工程材料教育部重点实验室;华东建筑设计研究院有限公司;上海同吉建筑工程设计有限公司;
【基金】：上海市科学技术委员会科研计划项目(16DZ1201602);上海市科学技术委员会科研计划项目(16DZ1201602) 上海现代建筑设计(集团)有限公司研究项目(11-1类-0016-结)
【分类号】：TU93;TU378

【相似文献】