Shear Strength Of Slender Beams Research Articles

Predicting shear strength of slender beams without reinforcement using hybrid gradient boosting trees and optimization algorithms

Predicting shear strength of slender beams without reinforcement using hybrid gradient boosting trees and optimization algorithms

Shear Behavior of High Strength Self-Compacting Concrete with Lower Transverse Reinforcement Index

ABSTRACT Self-Compacting Concrete (SCC) generally has lesser coarse aggregate contents and also the maximum size of aggregates is limited as compared to Normal Vibrating Concrete (NVC) for the same class of strength. This results in reduced aggregate interlock in Self-Compacting concrete as against NVC, which affects the shear strength of slender beams and thus, SCC might have lower shear strength. In this article, an experimental programme which includes six slender beams of High-Strength Self Compacting Concrete (HSSCC) with compressive strength more of than 90 MPa and with different stirrup spacing is presented. Experimental test results of shear strength of HSSCC beams are compared with high strength NVC beams for different stirrups spacing. The results showed the ultimate shear stress of HSSCC beams is lower than NVC beams and increase in transverse reinforcement index, ρw fy, in HSSCC beams decreases this difference. The results are also compared with different code provisions. Not much work has been done on beams with lower transverse reinforcement index (ρw fy) and in the present work, ρw fy ranges between 0.276 to 0.80.

Shear strength of slender SCC beams - possible differences from VC beams

ABSTRACT In comparison with vibrated concrete (VC) of the same strength class, self-compacting concrete (SCC) typically has a lower coarse aggregate content and, eventually, a smaller maximum aggregate size. This may reduce the aggregate interlock between the fracture surfaces in SCC. Since the aggregate interlock plays an important role in the shear strength of slender beams, SCC beams may have a shear strength lower than that of similar VC beams. This article summarizes experimental studies on the shear strength of reinforced SCC slender beams without and with shear reinforcement. The shear strengths of SCC beams are compared with the ones of VC beams and also to the calculated ones according to different code procedures. It is shown that powder-type SCC beams tend to have lower shear strength than similar VC beams and that the difference depends upon the concretes composition and the characteristics of the beams.

Shear strength of self-compacting concrete beams with small stirrups ratios

In comparison with a vibrated concrete (VC) of the same strength class, self-compacting concrete (SCC) typically has a lower coarse aggregate content and, possibly, a smaller maximum aggregate size. This may result in reduced aggregate interlock between the fracture surfaces of a SCC. Since aggregate interlock plays an important role in the shear strength of slender beams, SCC beams may have a shear strength lower than that of similar VC beams, but studies on that subject are still limited. This article summarizes an experimental programme that includes beams of high-strength SCC and transverse reinforcement ratios around the minimum given by different codes – a case that had not been investigated so far. The shear strengths of those SCC beams are compared with those of VC beams with similar concrete compressive strength and small ratios of transverse reinforcement and also compared with beams calculated according to different code procedures.

Shear Strength of Reinforced Concrete Beams under Uniformly Distributed Loads

This paper presents an analytical theory for shear resistance of reinforced concrete beams subjected to uniformly distributed loads. The authors examine slender beams with a span length-to-depth ratio (l/d) greater than 10 and deep beams in which l/d < 10. Simple expressions are derived for the ultimate shear capacity. The impact of size effect in the shear strength of slender beams is taken into account. A criterion for minimum shear reinforcement is also considered. The derived formulas are verified by comparisons to experimental data from the literature. Data were obtained on slender beams and deep beams with various strengths of concrete, longitudinal steel ratios, shear reinforcement ratios, l/d, and geometrical sizes. The shear strength of beams, both slender and deep, under a uniform load is found to be much higher than the shear strength of beams under a loading arrangement of two concentrated loads at the quarter points. The findings also demonstrate that ACI Code predictions for the ultimate shear force of beams under a uniform load are much lower for the cases of small beams and the predictions are higher for larger beams.