Browsing by Author "Betelhem Desalegn"

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    Shear Strength Analysis of RC Exterior Wide-Beam-Column Joint
    (Addis Ababa University, 2024-02) Betelhem Desalegn; Abrham Gebre (PhD)
    In seismically active areas where lightweight constructions are recommended, buildings with long-span floors and heavy self-weight create huge platforms. Ribbed slabs are commonly used to address this issue. Unlike conventional beams, wide beams in ribbed slab supporting frames often exceed framing column widths. Most design codes generally allow following a similar approach to the conventional beam-column joint with some additional beam width limitation which varies among those codes. Research suggests that relying solely on these limitations cannot guarantee adequate joint performance, as the seismic behavior of the joint is significantly influenced by the torsional behavior of transverse beams. This research analytically investigates the structural performance of RC wide beam-column joints with shallow transverse beams under cyclic loading. The accuracy of the FE model in predicting shear capacity performance was validated through comparison with experimental data. A parametric study using finite element analysis was conducted on 48 specimens with different LHS representative combination samples. The study primarily analyzed shear strength of the joints. Using regression analysis for specified range of values, a suggested formula considering transverse beam factors was proposed to be incorporated into the existing expected shear strength equation provided by ACI. An influential parameters of transverse beam were identified by sensitivity analysis. Concrete strength, longitudinal reinforcement ratio, stirrup yield strength, and spacing significantly affected the joint capacity. The shear capacity of the joint showed low sensitivity to changes in the yield strength of longitudinal bars. Smaller diameter bars in the transverse beam showed relatively reduced concrete damage. The study emphasized the importance of incorporating shallow RC transverse beams in the design process of wide beam-column joints. The study presents a systematic approach to improve and quantify shear capacity by considering various combinations of transverse beam parameters. The increased design options for improving shear capacity broaden the scope for practical decision-making, taking into account the availability of parameters and the ease of implementation.