| Composite slab of steel-concrete is a new structure developed since 1960s. Its advantages are so obvious that it is used widely by and by. This thesis brought forward a new composite structure, which combined steel sheet and concrete with additional shaped steel in the direction of wave under steel sheet. This slab belongs to bi-direction load-bending and anisotropic-orthotropic structure. With its effective load-carrying capacity, it is very economical compared with other structures of steel-concrete.In civil engineering, composite slabs with shaped steel, steel sheet and concrete are usually recognized as thin plates. Based on classic thin plate theory, the author studied the load-carrying capacity and design methods of this structure. Through analyzing bending stiffness of composite slabs in the paralled and cross wise wave direction of steel sheet, the author got load-bending stiffness in these two directions. With the finite elements method, the author studied the mechanism and load-carrying characters under uniform loading of composite slabs and put forward a theorem calculating distortion and analyzed crash mode of this structure.Four-way simply support common and long span composite slabs were also studied by the author with the finite elements method, and a calculation method was proposed. As quantity, distance and size of cross-section of shaped steel have great influences on load-carrying of whole composite slabs, the author presented design principles and methods, which are useful for future cross-section design of composite slabs with shaped steel, steel sheet and concrete. |
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