INFLUENCE OF TENSION STIFFENING AND CRACKED SHEAR MODULUS MODELS ON NON-LINEAR ANALYSIS OF HIGH STRENGTH FIBROUS REINFORCED CONCRETE SLABS
In the present study, new models are suggested and proposed for cracked shear modulus and tension
stiffening to study their effect on the response of the slab. These models are used in the nonlinear analysis
of High Strength Steel Fiber Reinforced Concrete (HSSFRC) slabs. The suggested models have multiple
shapes depending on the curvature factor, these models are compared with the well-known formulas used
in previous studies and great agreements are achieved. The Serendipity “eight-node” element type has
been adopted for representing the concrete and layered approach is used to simulate the concrete elements
and a smeared layer approach is used to represent the steel reinforcement. The concrete compression
behavior is modeled using strain hardening plasticity method, the first two stress invariants of the yield
condition is used. For finite element analysis, a computer program coded in Fortran 90 is developed and
used for performing nonlinear analysis on the slab. In order to check the validity of the current models,
many actual results for testing slabs “in the laboratory” are compared with the results from the present
study and a great agreement is achieved. All studied slabs were simply supported from four sides and
loaded with concentrated load at the middle of the slab, but slab S5 is simply supported by two opposite
parallel sides with line load parallel to the supports at the middle of the span of the slab. For the curvature
, Bg) it is found that the values (Bt =0.005-0.5, Bg =0.001-0.05) give the best simulation for the
slab. The effect of tension stiffening model is more than the effect of cracked shear modulus model and
there is an interaction between tension stiffening and cracked shear modulus models.
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