Changes in AS3600:2018 Amendment 2 (Concrete)
math 0.65 \times k_\Phi
. There is a minor impact on the reduction factor where columns are slender or where math Q/G \leq 0.25
, refer to calculations for math k_\Phi
.math V_{u,max}
) has been reduced by 10% in equation 8.2.3.3(1)
math V_{uc}
) by up to 50% from Amendment 1, in particular for thinner depth sections without reinforcement. Previously a limit of math k_v = 0.10
was placed for any beam where minimum shear reinforcement was not satisfied or no fitments were provided. This has now been increased to math k_v = 0.15
. Refer Cl 8.2.4.3(a)
math V^* \leq \Phi V_{u,min}
, the fitments may now be spaced at 500mm or math 0.75 \times D
, whereas previously 300mm or math 0.5 \times D
limit was imposed under all circumstances apart from very large beams.
math L < 5 \times \text{depth}
, Amendment 2 has introduced minor changes to the max allowable fitment spacing to reflect the actual fitment strength. math \text{spacing} = \sqrt{(f_{syf}/500)} \times 24 \times d
instead of math \text{spacing} = 24 \times d
previously in accordance with Cl 14.5.4(b)
math \text{depth} > 300\text{mm}
, shear fitments are now required even when math V^*
does not exceed math \Phi V_{uc}
. An additional factor math k_s
has been added factoring down the upper limit shear force that may be taken without adding fitments in Eq Cl 8.2.1.6(1).
math D_c
now renamed to math b
(smaller column cross-sectional dimensions). Refer Cl 1.7.
8. math K_s
now renamed to math k_s
(Beam Depth Factor to Determine Reinforcement Required). The definition of math K_s
in Cl 1.7 has not been updated in Amendment 2 from its previous version. It is believed that this definition should be further expanded in future revisions to reflect its use in Cl 8.2.1.6(1).
math k_v
and math \theta_v
in compliance with Cl 8.2.4.1. Therefore the Amendment 2 updates for the “General Method” Cl 8.2.4.2 are not listed above.