Research On The Damage Process And Design Method Of Structure Test Reaction Wall

The structure test reaction wall is a large scale special structure bearing special loads. It is required with high bearing capacity and large stiffness. At present, the building amount and research work of reaction wall are relatively inadequate, so the corresponding design codes and standards have not been issued yet. Therefore, it is necessary to study on the working behaviors of reaction wall. This dissertation researches on the damage process and design method for prestressed concrete box (PRB) reaction wall of structure laboratory. The research results can provide theoretical basis for the design of reaction wall in the future, and help designers to design the reaction wall in more effective and more economical ways.Finite element analysis method based on ABAQUS software and analytic method are used to study the damage and deformation characteristics and design method of PRB reaction wall. First, using the finite element software, the damage process and whole lateral deformation characteristics of PRB reaction wall under different horizontal load case are analyzed. Then, a simplified analytic calculating model of PRB reaction wall is proposed, and the formulas for lateral deflection and normal stress evaluation are derived, the calculated results are compared with the finite element results. Thirdly, the effect laws of concrete strength grade, wall thickness and arrangement of prestressed reinforcement to the working performance of reaction wall are investigated with finite element method.The analysis results indicate that the coupling beams above door hole are the weakest members of reaction wall to be damaged first, then the vertical stiffening wall limb and bottom of loading wall will be damaged in sequence; the whole lateral deformation of reaction wall under two different horizontal load cases show bending shape and bending-shear complex shape respectively; Box reaction wall can be simplified as a cantilever box beam structure, and its analytic calculation results is close to the results of numerical analysis. The lateral stiffness of PRB reaction wall has approximately linear relationship with concrete strength grade and wall thickness, so C40, C45 and C50 and thicker wall should be chosen in design, if the economic and spacial conditions allow; vertical prestressed reinforcement has better effects on cracks controlling and lateral stiffness improving than horizontal transverse prestressed reinforcement.