The Study Of Environmental Temperature Effect On Overlong Concrete External Wall Of Semi-basement

With the development of social economy and engineering technology, a lot of overlong concrete structures have been constructed throughout the country. An important study on these structures is how to deal with structural cracks aroused by temperature variation and concrete shrinkage. Choosing a practical engineering project as the background, this paper studies structural effect of an overlong concrete external wall of semi-basement suffering environmental temperature load and concrete shrinkage, from theoretical analysis and long-term on-site observation two aspects.Basing on available theories and practical experience, this paper considers factors such as environmental temperature variation, concrete shrinkage and creep, and so on, in analyzing environmental temperature effect of overlong structures. The study fixes on the most adverse temperature load and calculates the structural effect of the wall in two ways, by empirical formula and by linear elastic finite element analysis, to show distribution regularities of stress in wall. The study also discusses nonlinear procedure analysis on environmental temperature effect of the wall, and presents a simplified method to calculate stress loss due to creep, which on basis of stress relaxation theory.This paper introduces the long-term on-site observation work on the wall. By analyzing measured data, it sums up temperature field and strain field's distribution, and the regular pattern of strain field's variation along with the change of temperature field in wall.In the finality, the problems requiring further studies are discussed, including a new idea for dealing with structural cracks of overlong structures.