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In the past decades, widespread experimental research had conducted to understand the structural strengthening performance of carbon and glass fibre reinforced polymer (FRP) laminated / bonded reinforced concrete (RC) beams under static loading. Various studies include bond, flexural and shear strengths, debonding, durability properties like resistance to chloride ion penetration, the behaviour of FRP lamination at an elevated temperature and freeze-thaw exposure, corrosion resistance, and seismic behaviour, have been carried out. This paper reviews 415 beam specimens from the existing studies, especially on flexural strengthened RC beams using externally bonded FRP laminates. Critical observations were made, on the various aspects, like beam dimension, concrete strength, area of tensile steel reinforcement, FRP type, load-carrying capacity, and failure mode. The paper also suggests a proficient method for the externally FRP strengthening RC beams by incorporating different volume fractions of randomly oriented discrete short-fibres into the fresh-state of a concrete matrix to sort out the common (i.e., ductility depletion, debonding) issues. [ABSTRACT FROM AUTHOR]

Dhaka is one of the most seismic vulnerable regions in Bangladesh. Before constructing any building in this area, it has to be made sure that the building is earthquake resistant. The ability of resistance is highly dependent on the shape and structural system of the building. The objective of the study is to conduct an analysis on different regular and irregular shaped reinforced building considering the same dimension for each beam, column and slab following Bangladesh National Building Code (BNBC), 2020. Ten storied (G+9) building structures of six different shapes have been analyzed by using ETABS 2016 program for Dhaka (seismic zone 2). Out of these six different shapes, two are of regular plans (square & rectangle). Rest of the four shapes are with plan irregularity (W-shape, T-shape, L-shape & I-shape). Plan irregularities, vertical irregularities, storey displacement, storey drift and storey shear have been inspected for all models. Results show that in most cases, the buildings with irregularities have larger value of storey displacement and storey drift. The highest value for storey drift and displacement come for L and W shape model while the least value come for Rectangle shape model. On the other hand, storey shear changes little for irregular buildings. Besides, irregular buildings tend to fail more than buildings of regular shape. L shape model have not been able to pass the criteria of sway limitation, storey drift and torsion irregularity. W shape model has also crossed the sway limitation threshold. Shear walls have been introduced to the buildings who fail to make these buildings resistant towards earthquake. Results show that shear walls reduce the value of aforementioned three parameters. This research can be useful for the construction of buildings with different shapes and irregularities to take proper measurements for safety in Dhaka City. [ABSTRACT FROM AUTHOR]

Multi story Reinforced concrete cement Structure exposed to hazardous earthquakes. It was discovered that main reason behind failure of RC building is irregular distribution of mass, stiffness and strength or because of irregular geometrical arrangements. In reality, many existing structures contain irregularity because of useful and stylish prerequisites. However, past earthquake records show the poor seismic behaviour of this structure. The contextual analysis right now stresses onauxiliary conduct of multi-story working for various arrangement shapes like rectangular shape, H, U, L and plus shape. Demonstrating of 12-stories reinforced concrete frame structure is done on the ETABS programming for analysis. Post analysis of the structure of bending moments, maximum storey displacement and maximum shear force are computed and then compared for all the analysis result cases. For analysis of the structure response spectrum analysis is used. [ABSTRACT FROM AUTHOR]