Civil Engineering Reference
In-Depth Information
Series P
The four panels G-45-1.2, G-21.8-1.2, G-10.2-1.2 and G-0-1.2 form a series of panels with a
constant steel percentage (
ρ
,
ρ
t
) of 1.2%. Since the only variable in this series of panels is the
steel bar angle (
α
1
), the generated hysteretic loops of panels in series P can be used to assess
the effect of steel bar angle on the ductility, the stiffness and the energy dissipation capacity.
Series A45
Panels G-45-0.54, G-45-1.2 and G-45-2.7 form a series of panels with constant steel bar angle
of 45
◦
. Since the only variable in this series of panels is the steel percentage, the generated
hysteretic loops of panels in series A45 can be used to assess the effect of steel percentage on
the ductility, the stiffness and the energy dissipation capacity, when
45
◦
.
α
1
=
Series A0
Panels G-0-0.54, G-0-1.2 and G-0-2.7 form a series of panels with a constant steel bar angle
of 0
◦
. Since the only variable in this series of panels is the steel percentage, the generated
hysteretic loops of panels in series A0 can be used to assess the effect of steel percentage on
the cyclic responses of the panels when
0
◦
.
α
1
=
6.3.8.3 Generated Hysteretic Loops
Figure 6.37 shows the shear strain history used to generate the hysteretic loops of all the
eight demonstration panels. This shear strain history was chosen to be a multiple of 0.004, a
value that represents approximately the yield shear strain of panels reinforced with steel bars
oriented at 45
◦
to the applied principal stresses. An
α
1
angle of 45
◦
is used in conventional
steel layouts of RC shear walls and is taken as a reference.
Figures 6.38 and 6.39 show the CSMM generated hysteretic loops of the shear stress-strain
curves of all eight panels. The hysteretic loops in these two figures will be used to assess the
effect of varying the steel bar angle and the steel percentage on the ductilities, stiffnesses and
energy dissipation capacities of RC panels under cyclic shear.
Figure 6.37
Shear strain history used for all panels
