Composite construction method has been mainly popular due to its faster, lighter and economical methods in high rise buildings. Composite deck slab consisting of two different components, concrete being good in compression placed at the upper portion and the cold form profiled sheeting being good in resistance to tension is placed at the bottom of the deck slab. Composite slab being a combination of two different components, wide researches have been carried out to enhance the structural behavior and material properties. In this paper, trapezoidal profiled sheeting is utilized and constant geometrical dimensions are preferred throughout the study. Specimen consists of totally six numbers of trapezoidal profiled composite slabs cast using M20 grade concrete according to the recommendations of Euro code 4. Load-deflection behavior is keenly observed and recorded using the dial gauges and LVDT’s (Linear Variable differential Transducers) for comparison. When subjected to monotonic loading the composite slab specimens showed different behavioral changes in the structure at various load intervals. Out of the six specimens tested, three slabs at shorter shear spans exhibited failure at shear mode and three slabs tested at longer shear spans exhibited failure at flexure mode.
Nowadays, Composite sections of the steel and concrete have been utilized and considered around the world, yet filled tubular columns require more consideration. Broad examination work has been done in Japan in the most recent 15 years on this. This present attempt shows a trial study on the performance of Concrete Filled steel Tubular columns (CFT).The present research work depicts about signifying the utilization of Concrete Filled steel Tubular columns (CFT) instead of Reinforced Columns & to determine the conduct of composite columns. For this purpose sixteen numbers of columns with various cross area and different thickness of steel tube (8 short columns and 8 long columns) is subjected to external axial prestress and lateral loads. The circular and square composite columns are casted with different L/D apportion and wall thickness. The concrete used is M20.It is observed that Circular composite columns has less deflection and high load bearing capacity with deferred buckling while compared to the square composite columns.
In India, the construction field streams towards the hike with the advent of new innovative technologies. The increase in the quantity of construction seeks the superior quality from the researchers in terms of effective methodologies which reduce the requirement of manpower and material with increased efficiency and pace of construction. One of the most promising solutions for this issue suggested by the researchers is the precast construction. Precast construction entirely restructures the conventional construction process to improve the quality and pace of the construction. The predicaments with precast construction are shrinkage of filling material between the wall which leads to crack formation and also cause leakage of water. The occurrence of shrinkage is initiated and leaded by the compacting or filling problem in filling materials up to ground level due to the use of coarse aggregate and the usage of non flexible and improper bonding of sealant in the wall joints. In order to reduce these structural problems, we investigated the method of SIFCON (slurry infiltrated fibre concrete) with varies mix proportion 1: 1, 1:1.5 and 1:2 with the replacement of coarse aggregate by perlite. The sealant we used is poly sulphide sealant and the watercement ratio of the filling material varies between 0.3 and 0.4. Even though the conventional practical way of using fibres in SIFCON is limited up to 12%, we investigated the usage of fibres up to 20% in this experiment. The results obtained from the experiment shows that the filling material with the cement mortar ratio of 1:1.5 with 5% glass fibre applied in the method of Slurry Infiltrated Fibre Concrete successfully arrests the leakage of water between the wall joints.
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