Behaviour of RC Structural Elements With Laced Reinforcement

Abstract

Reinforced concrete due to its special properties like high compressive strength, fire resistant, durability etc., is considered as most widely accepted construction material in construction industry, but by placing reinforcement in some conventional forms, the properties of reinforced concrete elements showing significant poor results compared to some other alternative techniques of placing reinforcement. By using same percentage of steel and by altering pattern or position of reinforcement, the behaviour of reinforced concrete elements differ which will give significant upper bound results. Among the alternative techniques, Laced Reinforced Concrete (LRC) is most adaptable method of placing reinforcement and can be implemented in the structural RC elements like slabs, beams and floors. By introducing these inclined laced bars the concrete confinement area increases and this maintains structural integrity. By providing these inclined bars perpendicular to the

direction of propagation of crack, formation of cracks are arrested.  RC element incorporated with LRC can resist impact loads, earthquake loads and blast loads.  This dissertation work deals with two types of structural elements and describes the behaviour of parameters like ultimate load carrying capacity, deflections, and crack width by adopting the RC elements with LRC. In first series the investigations conducted on four beam elements of 1.5m length, 0.15m x 0.3m cross section area.. The deflections and crack width are taken at each and every step load by using dial gauge having least count of 0.01mm and hand hold microscope having least count of 0.02mm. The test results are tabulated and the graphs are drawn between load vs. deflection and moment vs. crack width and are compared with their companion specimens. The aim, by adopting LRC had fulfilled by attaining improved ductility, high member strength, reduced crack width and deflection.