Stiffening Girder Crack Risistance Research On Concrete Self-Anchored Suspension Bridge

With the development of the prestressed concrete construction technology, the bridge span becomes more longer . However, after construction, the appearance of the cracks in some of these bridges takes some unfavourable influence on the structures. Based on the concrete self-anchored suspension bridge in Chengdu to the background, we have a crack resistance research of the concrete self-anchored suspension bridge. This bridge is the first concrete self-anchored suspension bridge in southwestern china. The material of its stiffening girder is concrete, the anchorage area is steel-concrete composite structure. In order to understand crack resistance of the stiffening girder and provide evidence for the design and operation management, A scale(1:2)stiffening girder model is tested for the stiffening girder area.The main work in this paper is as follows:1. This paper introduces the development history and application actuality at home and abroad, summarizes the basic structural features and forcing characteristic.2. This paper introduces the crack defects and the cause of crack of PC bridge. It also analyse the sensitivity factors of the cracks.3. In this paper, we design a model of the stiffening girder according to the similitude theory. After making sure the survey points and load styles, a model is established based on the ANSYS software to analyse the stress of the stiffening girder. The stress and strain of test were compared to the result of the calculation. It also verify the working station under the disadvantage design load and validate the reliability of the stiffening girder.4. This paper provide a feasible way to test temperature in laboratory.