Seismic Rehabilitation of Existing Buildings

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Seismic Design Of Reinforced Concrete And Masonry Buildings

Mechanisms of interfacial bond in steel and polypropylene fiber reinforced geopolymer composites

Performance-based seismic design of self-centering steel frames with SMA-based braces

Shear strength of steel fibre reinforced concrete beams with stirrups

Performance-based plastic design method for buckling restrained braced frames

Cyclic behavior of shear-and-flexural yielding metallic dampers

This paper presents an experimental investigation on the effect of varying volume fractions of chopped basalt fibres on the mechanical properties of fibre-reinforced concrete (FRC) The fibre content is varied in the range of 0-2% The main parameters investigated are workability, compressive strength, splitting tensile strength, flexural strength, and flexural toughness Test results showed that the compression strength of concrete is marginally decreased with the addition of basalt fibers as compared to the plain concrete However, the mode of failure of FRC under compression is changed from brittle to ductile Splitting tensile strength of concrete is improved by 15% when the basalt fibres of 2% volume fraction is added to the concrete mix A significant increase up to 75% is noticed in the flexural tensile strength of basalt fibre-reinforced concrete with better post-peak residual strengths as compared to the plain concrete Further, the flexural toughness of BFRC is increased by nearly three times of the plain concrete based on the round panel tests

Experimental investigation on mechanical properties of basalt fibre-reinforced concrete

Steel caging technique is commonly used for the seismic strengthening of reinforced concrete (RC) columns of rectangular cross-section. The steel cage consists of angle sections placed at corners and held together by battens at intervals along the height. In the present study, a rational design method is developed to proportion the steel cage considering its confinement effect on the column concrete. An experimental study was carried out to verify the effectiveness of the proposed design method and detailing of steel cage battens within potential plastic hinge regions. One ordinary RC column and two strengthened columns were investigated experimentally under constant axial compressive load and gradually increasing reversed cyclic lateral displacements. Both strengthened columns showed excellent behavior in terms of flexural strength, lateral stiffness, energy dissipation and ductility due to the external confinement of the column concrete. The proposed model for confinement effect due to steel cage reasonably predicted moment capacities of the strengthened sections, which matched with the observed experimental values.

Seismic strengthening of RC columns using external steel cage

An experimental study is conducted on a series of 12 reinforced concrete (RC) and steel fiber-reinforced concrete (SFRC) beam specimens to study their shear and flexural strengths, failure mechanisms, and ductility response under monotonic loadings. The main parameters varied in this study are the concrete compressive strength, percentage of longitudinal reinforcement, fiber content, shear span-depth ratio, and amount of transverse stirrups. End-hooked steel fibers of volume fraction ranging from 0.5 to 1.5% are used in the specimens. Test results showed that the addition of steel fibers enhanced the flexural and shear strengths and the ductility of the flexural members. The addition of a minimum of 0.5% fiber content in the beams with shear stirrups changed the mode of failure from brittle to ductile, whereas a minimum fiber content of 1.0% is required to achieve the ductile response of the beams without shear stirrups. Using a curve-fitting method on the available test data, simple expressions are also derived to predict the shear strengths of medium- to large-scale flexural members with varying fiber contents.

Dipti Ranjan Sahoo

Papers

Performance-based plastic design method for buckling restrained braced frames

Cyclic behavior of shear-and-flexural yielding metallic dampers

Experimental investigation on mechanical properties of basalt fibre-reinforced concrete

Seismic strengthening of RC columns using external steel cage

Effect of Steel Fiber Content on Behavior of Concrete Beams with and without Stirrups