Hi,
I'm getting shear reinforcement in the slab where there shouldn't be any shear reo. According to AS3600 there shouldn't be any shear reo if V*<phiVuc 8.2.5).
Why RAM Concept constantly provides shear reo? In the report it specifies: transverse bar found, but there's no mentioning where it's coming from (see part of report below, where V*=64<phiVuc=272)
Starting 8.2 Shear Check
Considering Effect of Torsion on Shear:
No torsion to consider
No torsion reinforcement required
General Shear Design Parameters
bv = 1828 mm
do = 219.1 mm
bvd = 400500 mm²
Ac = 457100 mm²
Ast = 2632 mm²
Apt = 0 mm²
Ac = 457100 mm²
fc = 40 N/mm²
fsyf = 500 N/mm²
V* = 64.12 kN (absolute value)
M* = 20.26 kN-m
Setting Vo to zero for RC cross section
Setting Pv and Apt to zero for RC cross section
Calculating Web-Shear Cracking Vuc (8.2.7.2(b))
Precompression Stress = -0.0002275 N/mm² (at centroid)
Failure Tensile Stress = 2.277 N/mm²
Shear Stress Limit = 2.277 N/mm² (at centroid)
I = 2380000000 mm⁴
Q = 14280000 mm³
Vt = 693.7 kN [(limit stress) * bv * (I/Q)]
Vuc (web cracking) = 693.7 kN (Vt + Pv)
Calculating Flexure-Shear Cracking Vuc (8.2.7.2(a))
Beta1 = 1.519
Beta2 = 1
Beta3 = 1
Shear Stress Term = 0.6406 N/mm² ([..]¹´³)
Vuc (flexure-shear) = 389.7 kN
Vuc = 389.7 kN
Vu,max = 3204 kN
Less than minimum ligatures required, using large shear lig spacing (0.75D or 500 mm)
Maximum lig spacing = 187.5 mm (considers torsion lig spacing also)
Calculating Compression Strut Angle
Using 0.6062 instead of 0.6 for compatibility of 8.2.8, 8.2.9 and 8.2.10
Asv,min = 260.2 mm² (at max spacing)
Vu,min = 653 kN
Vu,max = 3204 kN
V*/phi = 91.6 kN
Theta-v = 30 degrees
Adjusted Vu,max = 3204 kN (after considering 8.3.3)
Transverse Bar Found:
As = 260.2 mm²
Fy = 500 N/mm²
Spacing = 187.5 mm
Vus = 263.3 kN
Total Vus = 263.3 kN
Vu = 653 kN
phi Vu = 457.1 kN