Stress Analysis And Calculation Of Composite Components Of Cement Formwork Reinforced With FRP And Concrete

In order to reduce the cost of construction, improve the efficiency labour, comply with the appeal of "green construction", composite components of cement formwork and concrete arise at the historic moment, and they have good prospects for development. My research group verify the feasibility of composite components of cement formwork and concrete in the experiment, but we lack the corresponding theoretical calculation formula, lead to the imperfect research of cement formwork, and hinder the further promotion and use of composite components of cement formwork and concrete. Therefore, the further research of stress calculation of composite components of cement formwork and concrete is necessary. Based on the research about experimental results in the paper, the corresponding stress calculation formula is established, the main research contents and the main conclusions are as follows:(1) The approximate section method, the section conversion method and the combination of force balance and section conversion method are respectively used to establish the applicable calculation formulas of cracking load of cement formwork and concrete superimposed slab, then introduce the correction coefficient. By reference to the literature formula and the calculation method of reinforced components, the yield load calculation formula of cement formwork and concrete superimposed slab are established through introducing the correction coefficient. By reference to calculation method of standard formula, the ultimate load calculation formula of cement formwork and concrete superimposed slab are established through introducing the correction coefficient. Through the comparision and analysis of the theoretical calculation values and experimental values, we know the calculation values agree well with the experimental values, and they can be used to calculate approximatively the load of such superimposed slab.(2) By reference to the literature formula, the cracking load formula of composite shear wall of cement formwork and concrete is established through introducing the correction coefficient under the static load. Through the comparision and analysis of the theoretical calculation values and experimental values, we know the calculation values agree well with the experimental values, and it can be used to calculate approximatively the cracking load of such composite shear wall under the static load.(3) Firstly the damage form of composite shear wall is determined under the static load, and then the standard calculation method, the simplified calculation method and the strength superposition method are used to establish the ultimate load formula of composite shear wall of cement formwork and concrete, through the comparision and analysis of the theoretical calculation values and experimental values, we know the theoretical calculation values by the standard calculation method and the simplified calculation method are conservative, and the theoretical calculation values by the strength superposition method agree well with the experimental values, and it can be used to calculate approximatively the ultimate load of such composite shear wall under the static load.(4) By reference to the calculation formula of cracking load and ultimate load, the cracking load formula and the ultimate load formula of composite shear wall of cement formwork and concrete is established through considering the seismic adjustment coefficient of bearing capacity under the cyclic load. Through the comparision and analysis of the theoretical calculation values and experimental values, we know the calculation values agree well with the experimental values, and it can be used to calculate approximatively the load of such composite shear wall under the cyclic load.