|
Title |
Direct Punching Shear Strength Model for Interior Slab-Column Connections and Column Footings with Shear Reinforcement
|
|
Keywords |
슬래브-기둥 접합부 ; 콘크리트 슬래브 ; 기초판 ; 직접 전단 ; 전단 보강 slab-column connections ; concrete slabs ; column footings ; direct punching shear ; shear reinforcement |
|
Abstract |
In the present study, an improved design method was developed for the punching shear strength of interior slabcolumn connections and column footings with and without shear reinforcement. In the evaluation of the punching shear strength, the possible failure mechanisms of the connections and column footings were considered. The considered failures modes were inclined tensile cracking of concrete, yielding of shear re-bars, and concrete crushing of compression zone/strut. The punching shear applied to the concrete critical section was assumed to be resisted mainly by the compression zone. The punching shear strength of the concrete compression zone was evaluated based on the material failure criteria of the concrete subjected to the compressive normal stress and shear stress. For verification of the proposed design method, its prediction was compared with the existing test results. The result showed that the proposed method predicted the strengths of the test specimens better than the current design methods of the KCI code for both the shear reinforced and unreinforced cases.
|