APPLICATION OF COMPOSITE CALCULATION MODEL FOR ANALYSIS OF MULTI-RIBBED COMPOSITE WALL

Multi-ribbed slab structure (MRSS) is a new structural system, characterized by low weight, high strength, energy-saving and good aseismic performance. As the main load-bearing member in MRSS, multi-ribbed composite wall consist of ribbed beam, ribbed column and the filling silicate block. It is difficult to define the elastic constants of the wall due to the complexity of the materials. Based on analysis of the constitution and force of the wall in elastic stage, the multi-ribbed composite wall is similar to fiber reinforced composite slab with silicate block as matrix and concrete frame grids as reinforcing fibers. On the principle of same ratio of concrete on section, the composite mechanics model is proposed by equaling the multi-ribbed composite wall to orthotropic fiber reinforced composite wall through two unidirectional fiber-reinforced. Practical formulas of elastic constants of the wall are suggested by simplified the equivalent wall as isotropic material. Main factors that affect the lateral rigidity are discussed, and the influence coefficients are advised based on experimental analysis and engineering applications. Practical formula of elastic lateral rigidity is proposed, and the calculating results are identical with that of the test. The research shows that the composite calculation model can be used in elastic stage, which provides theoretical basis for engineering design of multi-ribbed slab structure.