Lightweight concrete filled steel tubular beam under bending-shear

Lightweight concrete filled steel tubular (L-CFT) member is the new type of concrete filled steel tubular consisting of hollow steel tube and lightweight concrete. This study aims to investigate bending-shear behavior of the new type of lightweight concrete filled steel tubular, L-CFT, member, which is lighter than normal concrete filled steel tubular, N-CFT, member. The two test parameters, large diameter-to-thickness and shear span ratios are selected. The influence of diameter-to-thickness ratio on L-CFT deep beam under bending-shear through asymmetric four-point loading is discussed. Moreover, methods to predict two types of bending-shear capacities of L-CFT deep beam are provided. The elasto-plastic biaxial stress behavior of the steel tube under plane stress condition is also mentioned. The obtained experimental strengths agreed with proposed strength based upon RC deep beam theory.

Automated summary

This study investigates the bending-shear behavior of lightweight concrete filled steel tubular (L-CFT) compared to normal concrete filled steel tubular (N-CFT) and provides methods to predict the bending-shear capacities of L-CFT deep beams. The experimental strengths obtained agree with proposed strength based upon RC deep beam theory.