Research On Practicability Of Reinforcement Arrangement Method For Special Reinforced Concrete Structure By FEM

Based on three-dimensional elastic FEM and two-dimensional non-linear FEM, the synthetic design principle of "structural capacity design", "crack control design" and "optimization design" is researched. Several key technical problems in data transmission are solved and the optimization method of reinforcement arrangement is studied. The FEM visual management system is developed. And this design method is applied to three actual engineering projects. The main works done in this paper is listed as follows:1. "elastic stress equivalent principle" is studied, and the rationality of the design method based on three-dimensional elastic FEM and two-dimensional non-linear FEM is clarified. The key technical problems including the data transmission between three-dimensional elastic finite element result and two-dimensional finite model, calculation of shearing stress, the calculation of shearing stress difference, etc are solved.2. The object function, variables and restraint conditions are brought forward based on the result of two-dimensional finite element and Multiple Objective Programming method. The optimization of reinforcement design is studied on Multiple Objective Programming method—ideal point method and 0.618 method, and the corresponding calculating programme is compiled.3. The visual management system on three-dimensional elastic FEM and two-dimensional non-linear FEM is compiled. This system includes: preprocess of two-dimensional non-linear FEM, data transfer between three-dimensional elastic FEM result and two-dimensional FEM, reinforcement design optimization analysis and postprocess.4. The reinforcement arrangement of Longtan water-guide hole structure is analyzed. The elastic stress distribution, crack width, and steel stress are researched, proving that the existing design scheme meets the engineering requirement. And in the meantime the conclusions are obtained: preventing the high-pressure water permeating crack can reduce crack width and the optimization scheme is 3 (?)32 in the crack region.5. The reinforcement arrangement of Sutong pier structure is studied. The elastic stress distribution, whole crack pattern, surface-crack width, deep-crack pattern, surface steel stress and steel stress in deep-crack are researched. Then the conclusions are obtained: the steel quality on the structure bottom is too much, on the contrary, the steel quantity inside the structure is not enough. And the suggestion is made to reduce steel quantity in the structure bottom and increase steel quantity in the middle .6. The reinforcement arrangement of Longtan hole structure is researched. The elastic stress distribution and the influence of high-pressure water, transverse-seam grouting and steel welding anchor on the crack patter, lateral displacement, surface-crack width, deep-crack patter and steel stress are researched. The rational assessment based on these results is made.