Experimental and numerical investigation of T-joint enhanced confinement using flat steel strips
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ORIGINAL PAPER
Experimental and numerical investigation of T‑joint enhanced confinement using flat steel strips Qaiser uz Zaman Khan1 · Afaq Ahmad1 · Saqib Mehboob1 · Muhammad Nouman1 Received: 10 April 2020 / Accepted: 24 July 2020 © Springer Nature Switzerland AG 2020
Abstract In this present study, an effort has been made to investigate the performance of reinforced concrete (RC) beam-column joints (BC) sub-assemblage using flat strips (FS) as an amended technique for confinement, to enhance the shear capacity of BC sub assemblage in the RC structure. Furthermore, the finite element (FE) model for tested joint assemblage using ANSYS was also carried out to compare the effects of ductility in terms of load-carrying capacity and ultimate load. The assemblage was provided with adequate transverse reinforcement as per ACI-318. The specimens were investigated into two groups. The reference specimen, BC-SS (joint standard stirrups) detailed with conventional stirrups of 10 mm-Ø and modified specimen, BC-FS (detailed by using flat strips). The specimens were tested under vertically monotonic loading to study their behavior at the ultimate limit state (ULS). The results show the significant improvements in the BC-FS specimen referred to in terms of ductility factor, stiffness, and strength. Keywords Reinforced concrete · Flat strip · Finite element model · Ductility and strength · Confinement
Introduction Proper reinforcement anchorage is essential to enhance the performance of beam-column joints. To understand the behavior of reinforced concrete beam-column joints, extensive researches have been conducted since the early 1960s. Among the pioneers in this field, Hanson and Conner (1967), Hanson (1971) studied the behavior of joints in Portland Cement Association laboratories. In 1976, ACI-ASCE committee 352 published its first provisions on connection design (Parme 1976). Since then, the subject has gained greater popularity. Each year, the amount of research on this subject grows, providing increasing insight into joint behavior and provides the basis for the design of joints in both ordinary structures and structures required to resist heavy cyclic loading into the inelastic range. Different researchers have contributed to this area in different aspects. Paulay et al. (1978) studied the performance of bent-up bars in the stub-beams, earthquake-resistant structures, and mechanical anchorage and recommended their most effective
* Afaq Ahmad [email protected] 1
positions in the core of beam-columns joints for the exterior portions of the structures. Murty et al. (2003) studied the hair clip types bars as a transverse reinforcement for anchoring the main longitudinal bars according to the ACI and found them the most effective and recommended them to be constructed and installed easily. They also reported that these clip type bars can also be used in the structures where more ductility is required. Uma and Jain (2006) reviewed the codes of practices such as ACI-318, NZS-3101: Part-1, and Eurocode-8 EN-
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