PART 2 + Reinforcement: Properly design and detail the reinf | Ethiopian Construction Work Professionals - ETCONp

PART 2

+ Reinforcement: Properly design and detail the reinforcement layout in the critical areas around the columns or supports. This typically involves using shear reinforcement such as shear studs, stirrups, or shear reinforcement bars to enhance the shear resistance of the concrete slab.

+ Column capital or drop panel: Introduce a column capital or a drop panel at the column location to increase the stiffness and load-carrying capacity of the slab in the punching shear zone. This is achieved by thickening the slab locally around the column.

+ Post-tensioning: Implement post-tensioning in the slab to increase its overall strength and enhance its resistance against punching shear. Post-tensioning involves introducing high-strength steel tendons that are tensioned after the concrete has hardened.

+ Limiting the applied loads: Control the applied loads or reactions near the columns or supports to prevent excessive shear forces. This can be achieved through proper distribution of loads, use of load-bearing walls, or employing transfer structures.

+ Using punching shear reinforcement software: Utilize specialized software that can analyze and design the reinforcement requirements for punching shear. These software programs consider various factors such as slab thickness, column size, applied loads, and design codes to provide optimized reinforcement layouts.

****For existing buildings, here are some ways to improve punching shear resistance:

+Strengthen the slab using techniques like adding reinforcement or external bonding.

+Make localized modifications, such as adding shear reinforcement or increasing slab thickness.

+Redistribute loads to minimize punching shear forces.

+Monitor and maintain the structure to address any signs of distress or deterioration.

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