The Design And Optimization Of The Stiffness And Ductility About The High Reinforced Concrete Frame-shear Wall Structure

Rigidity is a force to make a structure unit displacement and it is also a structuralintrinsically link; Ductility shows the plastic deformation capacity of a structure and it is thegoal of the seismic design. Both of them have a decisive influence for the seismicperformance of the structure. When a simple wind-resistant design, the structure is requiredsufficient rigidity to resist deformation. When a simple seismic design, the structure isrequired sufficient ductility. So if the structural rigidity is too large or too small, it will be nothelpful for the seismic. There is no direct relationship between the size of the structuralstiffness and ductility, but the structural rigidity directly determines the achievement of thestructural ductility design. If the structural rigidity is too large, the ability of structuraldeformation is poor and when the horizontal seismic is coming, the structure will absorb toomuch seismic force and still be in the elastic stage and will not deform plastically. So theductility design can not be achieved and is not economical for the seismic design of theminimal probabilities. If the structural rigidity is too small, the structure deform severely andyield soon and may be damaged because of the insufficient stiffness. As result, to “make thestructural stiffness and ductility balance” is the ultimate goal of the structural design.The paper is based on the experience of structural design accumulated in this process ofstudying and practice of the author and the extensive literature and books have been referredso that some important components such as beams, coupling beams, plates, columns, shearwalls, embedded solid end, foundation, have been summarized about the methods and ideas ofthe stiffness and ductility design combined with the author’s own experience. On this basis,the specific exemplification and application of the structural stiffness and ductility theoryhave been elaborated in PKPM model adjustment and optimization and structural designprocess in the paper. The structural stiffness and ductility theory are combined with the workexperience in institute and PKPM practical skills so that the methods and ideas of thestructural stiffness and ductility design are generalized, that are completely helpful andStrongly operational for PKPM model adjustment and optimization.The stiffness and ductility of the high-rise Frame-Wall Structure have been designed andoptimized, contacting engineering case in this paper. Exploring the balance and defining theoptimal ranges between the structural stiffness and ductility make the structural stiffness andductility balance so that the structure have a good seismic performance. Contacting thepractical experience in institute, when the displacement angle, displacement ratio, cycle ratio,stiffness ratio, the ratio of stiffness to weight, shear weight ratio, axial compression ratio meetthe requirements of the building code and are in a specific range, the structure is not only safebut also economical and the ratios of the structural design are also easier to implement. As regards the Frame-Wall Structure of the seven degrees (0.15g) seismic fortification, when thedisplacement angle1/960~1/800, displacement ratio1.0~1.2, cycle ratio0.72~0.9, stiffnessratio0.9~1.08, the ratio of stiffness to weight2.7~3.24, the ratio of shear to weigh0.024~0.0288, axial compression ratio0.72~0.9, the structural stiffness and ductility aresuitable and balance and the best value can be got based on the structural safety. At the sametime, the good integrity of the Frame-Wall Structure is proved and the structural stiffness andductility can be controlled to satisfy the requirements of the building code to achieve"hardness and softness" and the good seismic performance.