Study On The Shearcapacity Of Wall-format Shaft Holewall Structure System Pilasterbased On The Finite Element Method

Wall-format shaft hole wall structure system is a kind of new structure system to resistearthquake. This structure is generally used for designing small high-rise residential systemnowadays because it not only can overcome some shortcomings such as the convex of columnin the frame structure and the general shear wall with a small hole and its large dead weight,but also it is a kind of the ductile bending-shear failure structure.Wall-format shaft hole wall refers to the shear wall depth-thick ratio is2~4. Because ofits small depth-thick ratio, the mechanical performance and cross-sectional design incompliance with the shear wall relevant provisions should accord to frame column design.Because the design code of the Wall-format shaft hole wall structure is not perfect, its shearbearing capacity and non-deformability is not only for the need of engineering design, also forthe perfection of the rules to provide certain reference. Therefore, studying of Wall-formatshaft hole wall has important practical value and theoretical significance.This paper mainly studies the shear bearing capacity and non-deformability of thedepth-thick ratio, axial compression ratio, concrete intensive grade, stirrup ratio, also providessome suggestions for engineering design. In this paper, the specific contain and conclusion ofresearch as below:(1). First we introduced the wall-format shaft hole wall application and development ofthe structural system and its advantages and disadvantages, the constitutive relation andparameters of yield criteria of concrete, the influencing factors of shear bearing capacity andductility coefficient, also a brief introduction to the finite element analysis of reinforcedconcrete structures.(2). In the case of concrete intensive grade, axial compression ratio and stirrup ratio,changing the size of the depth-thick ratio obtains that with the depth-thick ratio increases, theshear bearing capacity becomes larger, but the ductility coefficient reduces, and the failuremode of the ductile failure becomes brittle failure.(3). In the case of concrete intensive grade, depth-thick ratio and stirrup ratio, changingthe size of the axial compression ratio obtains that with the axial compression increases, the shear bearing capacity becomes larger, but the failure mode of the eccentric tension becomeseccentric compression, and the ductility coefficient reduces, so the failure mode of the ductilefailure becomes brittle failure. The axial compression ratio should not be too large, so theWall-format shaft hole wall structure is not suitable for high-rise buildings.(4). In the case of depth-thick ratio, axial compression ratio and stirrup ratio, changingthe size of concrete intensive grade obtains that with the axial compression increases, theshear bearing capacity becomes larger, but the magnitude of the change is very small, whilethe ductility coefficient reduces becomes large.(5). In the case of concrete intensive grade, axial compression ratio and depth-thick ratio,changing the size of the stirrup ratio obtains that with the axial compression increases, itmakes the confinement of concrete becoming large and limit the crack development ofconcrete. As the stiffness becoming large, the shear bearing capacity and non-deformability ofWall-format shaft hole wall will increases. And the failure mode of the bending-shear failurebecomes bending failure, meanwhile the ductility coefficient reduces becomes large.