Long Reinforced Concrete Floor Slab Structure Temperature Stress Research

With the development of our national economy, lots of super long tall buildings spring up. In addition, much longer non-crack structures are required with the increase of using space. But the cracks caused by environmental temperature directly influence the normal use of the super long structure. In the same time, there is no corresponding regulation which involves the impact of environmental temperature in the code of China and only some structural measures are considered instead in the code of China. So it's necessary to research the influence caused by environmental temperature and some work is finished in the thesis as followed.1. Temperature test and study of super long structureFirstly, an experimental plan of super long structure is formulated. And then, a temperature test is done to a 26-storey super long structure in Shenzhen city for one year. In the test, 48 testing points which are used to test the longitudinal stresses of the slabs before and after the pre-stress technique are set in the slabs from 22^nd to the roof and there are 8 points every floor.Secondly, the effect of several measures such as setting pre-stress technique, after-pouring strip and applying cold-rolled ribbed welded steel grid is studied in this thesis.2. Simulation analysis with FEM methodFEM method is adopted to imitate large amount of structural experiment which can make up the lack of experimental data. Therefore, a whole modeling is set to study the distribution of temperature stress of a super long structure with ANSYS, which effectually verifies the reliability of experimental results.The research of this thesis focuses on the whole modeling which reveals the effect of boundary constraint of the structure. So this thesis provides a reasonable method to calculate the temperature stress of super long structure.