Behavior of high strength concrete l-beams under combined bending and shear

الملخص EN

This investigation examines experimentally and statistically the behavior and ultimate strength of L-shape reinforced high strength concrete beams under combined bending and shear.

The experimental investigation consists of casting and testing of nine beams which were tested under bending and shear.

The effect of compressive strength, longitudinal reinforcement on the load carry capacity and the effect of transverse reinforcement on the shear strength is studied.

An increase in compressive strength by (65.56%) causes an increase in load carrying capacity and shear strength at cracking load by (21.47% and 162.9%) respectively.

An increase in longitudinal reinforcement ratio for bending by (153.8%) caused an increase in load carrying capacity by (46.37%) when the longitudinal reinforcement ratio is kept constant, an increase in transverse reinforcement index by(59.25% %) causes an increase in shear strength at ultimate load by (6.55 %).

By using multiple nonlinear stepwise regression method, based on data in this research and from other literature; equations were proposed for predicting shear strength at cracking and ultimate loads.

These proposed equations show good agreement and they are conservative when compared with equations given by Codes of practice.