Research On The Crack Controlling Of The Ultra Long Structure By Prestress

The ultra long structure massively appears in our country ,the prestress are commonly usedto deal with the crack controlling of these structure. Now, there are not many research on theanalysis and the design method of the ultra long pre-stressed structure ,and has not formed theconsistent design method to this structure, this article unifies the actual project and the correlationtest, has made the analysis to the ultra long pre-stressed structure's design and the construction,the main research work is as follows:1. Combin the scene test of the project, has carried on the analysis in view of the solar radiation tothe structure, and proposed the calculating method of the temperature function produced by thesolar radiation, and compared theoretical calculation with the measured data result.2. Carried on the long-term strain and the temperature test of the ultra long pre-stressed structureand the theoretical calculation to various measuring points' stress and strain, mainly calculated theinfluence produced by the temperature and the shrinkage to the structure, and has compared thetheoretical calculation and the test result, explained the way to calculates the temperature and thecontraction function to the ultra long structure, put forward the related proposal to thecomputation precision and crack control method to the ultra long structure.3. For the ultra long pre-stressed structure's particularity, the construction way has much influenceto the ultra long structure., this article has analyzed the ultra long pre-stressed structure'sconstruction rote effect, proposed the reasonable construction method to the ultra longpre-stressed structure.4. In summary the formerly research results, compared with two different design methodconsidering temperature function to the ultra long structure, has carried on the finite elementanalysis to the actual structure, proposed the main point to ultra long structure's design,simultaneously, compared the considering temperature and contraction function with not toconsider the temperature function in the design, has compared the quantity of the reinforcing steelbar of the component, explained the design method of the combination the temperature function towith other loads.