| Title |
Effect of Maximum Aggregate Size on Shear Response of Two-Span High-Strength Lightweight Aggregate Concrete Beams |
| Authors |
임채림(Im, Chae-Rim) ; 양근혁(Yang, Keun-Hyeok) ; 심재일(Sim, Jae-Il) |
| DOI |
https://doi.org/10.5659/JAIK.2024.40.11.217 |
| Keywords |
Shear; Lightweight Aggregate Concrete; Continuous Beam; Aggregate Size; Modification Factor |
| Abstract |
This study examined the shear behavior of two-span lightweight aggregate concrete (LWAC) beams with a designed compressive strength of
40 MPa and compared the modifications determined from the measured shear strengths with those specified in ACI 318-19 and Eurocode 2,
as well as those proposed by Yang and Ashour. The main test parameters investigated were the concrete unit weight and the maximum size
of the aggregate. Test results showed that the increase in the aggregate size for normal-weight concrete beams led to an increase in the shear
capacity and load redistribution ratio calculated after the inclined shear cracks occurred within the interior shear spans, whereas these
increasing rates became insignificant as the concrete unit weight decreased. Consequently, the measured modification factor tended to decrease
with the decrease in the concrete unit weight and aggregate size. Thus, the code provisions unconservatively estimated the modification
factors for the present two-span LWAC beams, whereas Yang and Ashour’s model provided promising estimations. |