Internal force distribution in RC slabs subjected to punching shear

Abstract

Type of publication:Peer reviewed journal article a b s t r a c tReinforced concrete (RC) two-way slabs without shear reinforcement are commonly used in many structural systems. This paper investigated the structural behaviour of RC slabs subjected to concentrated loads leading to punching shear failure using shell and continuum nonlinear finite element analysis (NLFEA). Shear force distributions are studied for four types of slabs with different geometry of support, geometry of slab and layout of reinforcement. All factors investigated have been proven to influence the shear force distributions along the control perimeter around the support. Significant shear force redistributions due to cracking and reinforcement yielding have been observed using NLFEA. Reduced control perimeters to be used for simplified approaches accounting for calculated shear force distributions are calculated using both NLFE approaches.

Shear assessment of a reinforced concrete bridge deck slab according to level‐of‐approximation approach

“…Before demolition, the condition and structural behavior of the bridge were studied within a research project with the aim of developing methods for improved bridge assessment. There were no sign of corrosion, wear or any other damage to the slab prior to the test …”

“…The factor β = a v /2d to consider arching action was calculated to be 0.62 and 0.5 for the Load 1 and 2, respectively. The choice of effective width has been discussed in Lantsoght et al and Shu et al k v is a factor consider the size of the slab; f cm is mean compressive concrete strength; z is the effective shear depth of RC slab; b w refers to the effective width. The length of effective width b w for one‐way shear is shown in Figure .…”

“…Therefore, the redistribution of shear force due to nonlinearity (e.g., cracking and plasticity) can be considered in the calculation. The formulation of equitation (1), (2) and (7) is still used, as combined in (11). The external load was increased and the axial strain ε x was calculated by iteration until shear strength and applied load reached equilibrium.…”

“…The aim of this study was to examine the LoA approach according to MC2010 and modeling methods developed by Shu et al, on a field‐tested bridge deck structure, for assessment of and to investigate the response of an existing real structure in engineering practice. The full‐scale field test has been carried out on a 55‐year RC bridge; the deck slab was subjected to concentrated load near one of the main girders, which led to a shear‐type failure of the slab.…”

“…A similar consistent approach has been introduced for the sectional capacity of members with shear reinforcement and for the punching shear capacity based on the critical shear crack theory (CSCT). 9 The aim of this study was to examine the LoA approach according to MC2010 8 and modeling methods developed by Shu et al 10,11 , on a field-tested bridge deck structure, 10,11 for assessment of and to investigate the response of an existing real structure in engineering practice. The full-scale field test has been carried out on a 55-year RC bridge; the deck slab was subjected to concentrated load near one of the main girders, which led to a shear-type failure of the slab.…”