Extended Strip Model for Reinforced Concrete Slabs under Concentrated Loads

Typically, beam shear failure is studied by testing small, heavily
reinforced beams subjected to concentrated loads, and punching
shear failure by testing slab-column connections. Both cases are
related to shear in slender, flexural members. For deep members,
strut-and-tie methods provide solutions. One-way slabs subjected
to concentrated loads close to supports, as occurs with truck loads
on slab bridges, are much less studied. A theoretical solution to
this problem is found by modifying the Strip Model for punching
shear into an Extended Strip Model, taking into account the strut
between the load and the support. Moreover, the Extended Strip
Model takes into account the reduction in capacity resulting from
unfavorable geometric circumstances. The resulting capacities
based on the Extended Strip Model and on the shear provisions
from NEN-EN 1992-1-1:2005 and ACI 318-14 are compared to
experimental results, showing the improvement and uniformity of
results by using the Extended Strip Model.