18-01-2016, 03:44 PM
Generally bricks will not act as a structural element, so it may be an effective strengthening technique to keep infill walls and RC frame elements together and forcing them to work as a whole until the end of the earthquake. The purpose of the present study is to study the influence of infill and reinforced concrete strip in Two-Dimensional Four Storey and Three-bays RC framed System with central bay infill. Two RCC strips were constructed in each panel of infill bays and to find the behaviour of the frame with rcc strip present in between the brick layer, Load carrying capacity of the frame, load –deflection behaviour, Stiffness, Ductility and Comparing the results with software.
A 3-bay 4-storey two dimensional R.C frame with central bay infill are cast for M30 along with test specimens. Two RCC strips were constructed in each panel of infill bays. The reinforcement strip comprises of 8mm diameter bars in it. The frame has undergone with load test for its ultimate load carrying capacity and post cyclic loading was done. IS 10262-2009 code was used for mix design purpose, IS 1893-2002(Part I), IS 13920-1993, IS 4326-1993 code are used for aseismic design and IS 875-1887(Part I and Part II) for calculation of dead load and live load. Load was applied at the top and middle storey of the frame from the left side with the help of load cells.
A load cell of 500 kN was fixed straight to the beam column joint of the frame in the top storey and similarly 100 kN in the middle storey in the left side of the frame. LVDT have been fixed at top, middle and bottom of the right side of beam column joint in frame and displacements are measured. Cyclic loading was applied on the frame in kN with the help of load cells till the frame gets cracked out and failed . The stiffness is calculated by dividing the values of peak load and displacement. Ductility factor is calculated by ultimate load divided by peak load.
At 50kN initial cracks were found at the joints of the frame for about 3-4cm in length. At 110kN diagonal cracks have been found in the brick layer. At 120kN minor cracks have been found in the bottom of the foundation in the tension side of the frame. At 170kN the beam column joint got failed increasingly from bottom to the top storey in the 1st left side column. The width of the crack is found to be 1cm. The ultimate load carrying capacity of the frame is 170kN .After the ultimate loading of the frame, post-cyclic loading is done upto 5 number of load cycles i.e till 50kN. The ductility of the frame is higher due to the reinforcement strip in the panels. The frame sways longitudinally for about 12cm. The transverse sway has been occurred in the frame due to the presence of rcc strip in between the brick panel for about 22cm and the transverse bending for about 13.8cm. Thus the brick infill in the frame is stronger due to the presence of rcc strip.