METHODS OF CALCULATION All three approaches considered herein take the punching strength of a slab with shear reinforcement as the least of VR,cs, VR,out, and VR,max, but not less that VR,c, where VR,c is the resistance of an otherwise similar slab without shear rein- forcement; VR,cs is the combined resistance of the concrete and shear reinforcement; VR,out is the resistance from the concrete alone just outside the shear reinforcement;
Performance of reinforced concrete slabs under punching Jun 23, 2020 · The experimental program of this study consisted of 12 slab specimens. The parameters investigated include ratio of reinforcement in compression and tension, amount of shear reinforcement and arrangement of shear reinforcement. Flexural reinforcement ratio especially in tension had a noticeable effect on the mode of failure and ultimate punching capacity of slabs.
For structures, the lateral stability of which do not rely on the frame action between the slab and columns and in which adjacent spans do not differ in length by more than 25%, the design punching shear may be obtained by enhancing V Ed by 1.15 for internal columns,
Punching Shear Strength Model for Reinforced Concrete Flat Mar 03, 2021 · Abstract. Many existing studies on punching shear in a RC flat plate slab without shear reinforcement consider uncracked concrete in the compression zone or the aggregate interlock mechanism in the cracked tension zone as shear resistance to external shear forces. However, recent studies have provided clear experimental evidence indicating interdependency between the resistance
SP-232:Punching Shear in Reinforced Concrete SlabsHowever, these structures develop complex three-dimensional stresses in the slab, at the columns, which can eventually lead to a potentially catastrophic brittle punching shear failure. Although structural failures are rare, in part due to high safety factors, understanding punching shear phenomenon is crucial for safe and rational design of flat reinforced concrete slabs supported on columns.
fywd,ef = effective design strength of the punching shear reinforcement, = 250 + 0.25 d fywd (MPa.) d = mean effective depth of the slabs (mm) V v v u d Ed Ed Rd,max 0 Max. shear stress at column face, = = 0.5 fcd Punching Shear Reinforcement Cl. 6.4.5, Equ6.52 8.5 EC2 Equ6.53 EC 2:Concise:V v v u d Ed Ed Rd,max 0
Strengthening of Flat Slabs with Cut-Out Openings A flat slab is a type of reinforced concrete floor system where the slab is supported directly by columns, instead of beams.This system offers many advantages such as reduced headroom, flexibility in the distribution of services, reduced formwork complexity during construction, etc. Strengthening of flat slabs may become necessary especially when openings are introduced.
Two-Way Flat Plate Concrete Floor System Design= 20 psf, and unfactored live load = 40 psf. Flat plate concrete floor system does not use beams between columns or drop panels and it is usually suited for lightly loaded floors with short spans typically for residential and hotel buildings. The lateral loads are independently resisted by shear walls. The two design procedures shown in ACI 318-
Punching Shear Failure. Punching shear is a type of failure of reinforced concrete slabs subjected to high localized forces. In flat slab structures this occurs at column support points. The failure is due to shear. This type of failure is catastrophic because no visible signs are shown prior to failure. Types of Shear Punching shear behavior of concrete flat plate slab 5 rows · Jul 01, 2007 · The punching shear capacity of the slab-column connection is affected by the size of column,