The influence of detailing on the behavior of steel fibber reinforced concrete (SFRC) opening corners is reported. Mixed rather than one, aspect ratio of crimped-type steel fibers was used in the concrete. The variable investigated, was the amount of splay steel in the corner. The inclusion of splay steel stiffens the joint and substantially increases its effectively used in the currently recommended splay steel content could be effectively used in the corner hence the failure occurs due to formation of a hinge in one of the members framing into corner rather than a diagonal tension failure at the corner itself, as obtained in non-fiber concrete opening corners. On the basis of the results of this and another investigation on SFRC opening corners, it can be concluded that splay steel contents in excess of the hitherto recommended 50% of the main steel percentage, can be efficiently used in SFRC opening corners.

The present work aims to study the seismic performance of exterior shear wall-slab joint with non-conventional reinforcement detailing. Four joint sub assemblages were tested under reverse cyclic loading applied at the end of the slab. The specimens were sorted into two types based on the joint reinforcement detailing. Type 1 model comprises of two joint assemblages having joint detailing as per the conventional detailing of slab bars at the joint.The second set of models (Type 2) comprises of two specimens having additional cross bracing reinforcements for the joints detailed as per the provisions given for beam–column joint in IS 13920: 1993. Analytical investigations were employed to compare the experimental results. The experimental results and analytical studies indicate that additional cross bracing reinforcements improves the seismic performance.

In this paper, seismic behavior of wide beams was investigated. First, code provisions and results of previous tests on reinforcement concrete wide beam-column connections were reviewed. After precise investigation of previous test results and in order to detailed study of behavior of wide joints, 4 specimens of exterior wide beam-column connections in scale of 3: 5 were casted and tested under constant axial and cyclic lateral lateral loads. The specimens were designed and detailed in accordance with ACI 318-14 and ACI 352R-02. In tested specimens, differet geometries for columns (square, rectangular or circular) and spandre beams (wide or conventional) were considered. During the tsets, formation of full-width flexural plastic hinge of wide beams was observed in all the specimens without any shear or torsional failure. Energy absorption of specimens was relatively high and that is because of using stirrups at the joint area and axial loads apllied to columns. The width of spandrel beam and geometry of columns influenced the seismic performance of tested specimens. A comparison between experimental results and ACI provisions showed that dimentional limitations of ACI 318 on wide beams can be violated. Also, in wide joints with axial load ratio greater than 15%, the bond performance of column longitudinal bars is improved and ACI 352R provisions in this context can be relaxed.

The present work aims to study the seismic performance of exterior beam column joint with non-conventional reinforcement detailing. Four joint sub assemblages were tested under reverse cyclic loading applied at beam end. The specimens were sorted into two groups based on the joint reinforcement detailing. The first group (Group A) comprises of two joint assemblages having joint detailing as per construction code of practice in India (IS 456:2000) with two axial load cases. The second group (Group B) comprises of two specimens having additional cross bracing reinforcements for the joints detailed as per IS 456:2000 with similar axial load cases that in first group. The experimental investigations are validated with the analytical studies carried out by fmite element models using ANSYS. The experimental results and analytical study indicate that additional cross bracing reinforcements improves the seismic performance.

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This paper presents the effect of reinforced high performance concrete (HPC) in exterior beam-column joint with and without fibre under monotonic loading. In this experimental investigation, cross-diagonal bars have been provided at the joint for reducing the congestion of reinforcement in joints, and also M75 grade of concrete with optimum mix proportion of 10 % silica fume and 0.3 % glass fibre was used. Four exterior beam-column joint sub-assemblages were tested. The specimens were divided into two types based on the reinforcement detailing.Type A comprises two joint sub-assemblages with joint detailing as per construction code of practice in India (IS 456-2000), and Type B comprises two joint subassemblages with joint detailing as per ductile detailing code of practice in India (IS 13920-1993). In each group there was one specimen of control mix and the remaining one specimen of fibre-reinforced mix. All the test specimens were designed to satisfy the strong column–weak beam concept. The performances of specimens were compared with the control mix and the fibre-reinforced mix. The results show that exterior beam-column joint specimens with silica fume and glass fibre in the HPC mix showed better performance.