No abstract

Concrete is one of the most resourceful and environmental friendly building materials. It can be cast to fit any structural shape from a cylindrical water storage tank to a rectangular beam, slabs and column in a high-rise building. In RC buildings, portions of columns that are common to beams at their intersections are called beam column joints. Beam-column joints have a crucial role in the structural integrity of the buildings. Review of literature indicates that numerous studies were conducted in the past to study the behaviour of beam-column joints with normal concrete. However, those recommendations are not intended for the fibre reinforced concrete. Some indicates that this material is an alternative to the confining reinforcement in the joint region. So the comparative study of the performance of different fibres in beam column joint has a greater importance and relevance in the field of RCC framed structures. This thesis aims to study the behaviour of beam column joint by evaluating the performance of fibre reinforced concrete. The incorporation of fibres in beam column joint is analysed in this study. The use of different types of fibres such as steel and polypropylene are evaluated.

Shrinkage cracking is a common source of distress in concrete structures. In addition to being unsightly, these cracks serve to accelerate other forms of damage in concrete, thereby shortening the service life of structures. One solution to reduce the potential for shrinkage cracking is to incorporate a shrinkage reducing admixture (SRA) in concrete mixtures. SRAs belong to a special type of organic chemicals (i.e., surfactants) that when mixed in water, reduce the surface tension of the liquid, and thereby reduce the magnitude of capillary stresses and shrinkage strains that occur when concrete is losing moisture. Various studies show that SRAs have proven to reduce drying, autogenous, and plastic shrinkage, which has been summarized in this literature. Keywords—Shrinkage Reducing Admixtures, Surfactants, Drying shrinkage, Plastic shrinkage, Autogenous shrinkage.

No abstract

Concrete-Filled Steel Tubes (CFST) are composite members consisting of a steel tube infilled with concrete. The behavior of the composite member will be better than the simple combination of two materials. In the construction of high rise buildings, CFST is one of such innovative new building material, which provides not only an increase in the load carrying capacity but also economy and rapid construction, and thus results in cost saving. Earlier works carried out on CFST have indicated that these sections possess high ductility, fire resistance, strength, resist bending moment, prevents local buckling of steel, spalling of concrete and stiffness properties. The tube acts as a formwork in construction hence decreases its labor and material costs. In earthquake prone areas multi-storied buildings are erected by considering the above properties. This paper portrayed the flexural behavior of CFST structural members with and without reinforcement. Keywords-Concrete filled steel tubes, finite element analysis, flexural behavior.