Load Bearing Capacity Of Bridge Deck Slab With Slightly Curved Bottom

Because it is simple to make manufacture slab with slightly curved bottom, and is economical to use steel, and is relatively great in aspect of load bearing potential capacity, the slab often has been used as braced arch and rigid-frame arch bridges' deck slab in 1970s and 1980s. The slab has been used more than 30 years. The mass of the slab have diseases in varying degrees by investigation, so the problem faced us is to strengthen and remake the slab. In addition, the slab will be used in underdeveloped region of our country. Therefore, it is very important to evaluate the load bearing capacity of slab with slightly curved bottom. The research information of the slab that has been used for forepassed decades is extremely few. There is a lack of the method of calculating load bearing capacity of slab with slightly curved bottom in our bridge criterion.To evaluate load bearing capacity of slab with slightly curved bottom, and provide scientific basis for strengthening and remaking and designing the slab, this paper discuss the method of calculating load bearing capacity of slab with slightly curved bottom according to the ministry of communications' scientific research project, that is Technique Research of Detection , Evaluation and Strengthening and its Spread.This paper discusses the performance of load bearing under different boundary conditions by model test and finite element analysis. The x-side binding of the supporting surface connecting with up-side chord member of slice arch is the most important factor that affects membrane effect of the slab. The load bearig capacity of the slab with fixed end increased forty percent of the capacity of the simple-supported slab, because membrane effect of the slab with fixed end is remarkable. On the basis of the test and finite element analysis, and on the experience of exsting research payoffs, this paper advance the method of calculating load bearing capacity of slab with slightly curved bottom considering membrane effect of the slab, and deduce the corresponding formulas. Test has proved that the calculation result is safe and reliable and actual using the method of this paper.