1. Safety of large reinforced concrete members without web reinforcement subjected to shear.
- Author
-
CHE Yi and YU Lei
- Subjects
- *
CONSTRUCTION materials , *STRUCTURAL frames , *STRAINS & stresses (Mechanics) , *REINFORCED concrete , *COMPOSITE-reinforced concrete - Abstract
The safety of shear design method in the 'code for design of concrete structures' ( GB 50010-2010) for reinforced concrete members without web reinforcement was examined based on the analysis of the thick slab in a bridge that failed in shear. Based on the results of shear tests conducted on large beams with depths ranging from 500 mm to 1 200 mm, and test data of large beams and thick slabs from other researchers, the code expressions for shear strength of members without web reinforcement were evaluated. The influence of minimum web reinforcement and distributed longitudinal reinforcement on shear strength of large members was also discussed. It is shown that the shear strength of large members without web reinforcement exhibits significant size effect such that the code expressions into which a size effect factor has been incorporated are unable to characterize the influence of depth on shear strength of members, resulting in unsafe results when applying to deep beams (a/h0 < 2. 0) with low longitudinal reinforcement ratio and with depth greater than 1 000 mm, and to slender beams (a/h0 ⩾2. 0) with longitudinal reinforcement less than 1. 00% or with depth greater than 1 000 mm. Minimum stirrups required by code provisions are found to be effective for large members to avoid brittle shear failure, while distributed longitudinal reinforcement is less effective for member with depth over 1 000 mm without web reinforcement. [ABSTRACT FROM AUTHOR]
- Published
- 2014