Abstract
This study shows the torsional conduct of aggregate streaming beams of reinforced concrete recycling. Pure torsion was perceived for 15 reinforced concrete beams containing recycled concrete aggregates. The beams were grouped into five lengths and cross-sectional groups. The study’s principal parameters were the various percentages of longitudinal steel reinforcement and the proportions of recycled aggregates. The beams were purely twisted until failure and investigated for torsional and crack behaviour. The findings show that the beams with maximum steel enhancement and standard aggregate exhibited maximum cracking power and ultimate torsional strength. Recycled aggregates increased the presence of splitting and the ultimate strength, and the effects of steel strengthening in recycled beams were apparent. In a second analysis, the whole torsional reaction of the beams was analytically predicted. A soft truss model was used and matched with test results for standard beams. A strong compromise was generally reached.
Highlights
E softened membrane model (SMM) for predicting the behaviour of reinforced concrete (RC) membrane elements under shear was expanded by Chyuan-Hwan and Hsub [1] to predict the behaviour of RC members subjected to torsion. e softened membrane model for torsion (SMMT) is a new analytical method that accounts for the strain gradient of concrete struts in the shear flow zone by making two changes to the constitutive relationships of concrete. e SMMT may produce a reasonable forecast of torque-twist curves until reaching a peak, but it is not a decent simulation of postpeak curves according to Peng and Wong [2]
In this research, we developed the “softened membrane model for torsion (SMMT)” theory for predicting a torque twist curve, including precracking and postcracking, as well as posttorsion reactions to the torque beam with recycled concrete as a coarse aggregate flowing concrete, by adding a factor that changes the tensile strength [24]
During the first loading stages, the checked beam was free of cracks at a slight twisting angle (AD) before its application hit the moment of torsional cracking (Tcr), which was the torque of a cracking process
Summary
Due to safety considerations and the renovation of old buildings, the use of horticulture in concrete production has increased over the past few years, with a consequence that the number of dilapidated materials has risen and that natural aggregates have been increasingly used, leading to a depletion of natural resources, which has required the use of recycled aggregates. E softened membrane model for torsion (SMMT) is a new analytical method that accounts for the strain gradient of concrete struts in the shear flow zone by making two changes to the constitutive relationships of concrete. Karayannis and Chalioris [9] proposed a new approach in which a bilinear stress-strain relationship was used to predict the capacity of prestressed concrete beams under pure torsion and torsion combined with shear and flexure, with a postcracking tension softening branch for the concrete in tension and special failure criteria for biaxial stress states. In this research, we developed the “softened membrane model for torsion (SMMT)” theory for predicting a torque twist curve, including precracking and postcracking, as well as posttorsion reactions to the torque beam with recycled concrete as a coarse aggregate flowing concrete, by adding a factor that changes the tensile strength [24]. Note that one of the differences between the algorithms of the SMMT and the SMM is the variable td (and so are the reinforcement ratios σl and σt) in the SMMT
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