Analysis And Research On The Cracking Propagation Mode Of Basement Roof

Along with the flourish development of construction in China, the phenomenon of the shortage of parking spaces, commercial space shortage promoted our use of the underground space of various buildings, which spawned the use of large basements. With the construction area of the basement getting bigger, many frequently occurred disease of large basement s gradually exposed. The content of this paper revolves around a practical engineering example, researching various factors of the large basement roof cracks and post-cast strip closure time, and studying the causes of disease. The main research contents of this paper include:The use of software like MIDAS FEA, after getting the project overall stress characteristics, in the plate analysis in detail, we set a plurality of post-cast strip closure time, to study the effect of concrete age after pouring belt on the resisting shrinkage an creep phenomenon of concrete. We can find when the closed time is long, the long-term performance of the plate in regular service stage is more favorable. The characteristics of crack model was also studied with factors like setting of post-cast strip, temperature and settlement. We could know some conclusion such as setting the post pouring belt so that the crack is more uniform, the temperature drop tend to cause the plate top cracks, settlement crack in settlement side is more concentrated etc.. Fracture morphology of various factors all have their own rules, some of the conclusion also can be extended to more engineering example. At last, the analysis results is used on investigating causes of disease "Yi Jing Yuan "project, and making some suggestions of prevention and repair of the crack problem in this project. This also provide a reference for similar projects.