http://localhost:8081/jspui/handle/123456789/5 Fri, 18 Jul 2025 02:54:41 GMT 2025-07-18T02:54:41Z http://localhost:8081/jspui/handle/123456789/18004 Title: BOND BEHAVIOUR OF RCA CONCRETE Authors: Singh, Prabhjot Abstract: Bond strength of deformed steel bar embedded in RCA concrete containing RCA replacement levels in the range of 0-100% has been experimentally investigated using splice beam specimens for the splice length of 15 and 25 rebar diameter. The mechanical properties of RCA concrete mixtures were seen to be influenced by the RCA source and the parameter brittleness index was used to characterise the relative magnitude of concrete compressive and tensile strength. The brittleness index of the RCA concrete containing RCA of unknown sources was observed to increase with increase in replacement ratio whereas that of the RCA concrete containing RCA obtained from known source was relatively unaffected by the replacement ratio. Splitting bond failure were observed with the splice lengths and the normalised bond strength was observed to decrease with increase in replacement for the RCA concrete containing RCA from unknown source which mirrors the trends observed for the brittleness index for this concrete. In the RCA concrete containing RCA from known source, like the brittleness index the bond strength was relatively insensitive to the aggregate replacement ratio. Based on the limited data base, the bond strength of 12 mm diameter deformed bars embedded in RCA concrete has been suggested to be equal to 75% of the value for natural aggregate concrete. Sat, 01 Jun 2013 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/18004 2013-06-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/18003 Title: DISCHARGE CHARACTERISTICS OF ORIFICE TYPE p SPILLWAY UNDER OBLIQUE APPROACH FLOW Authors: Hussain, Sabir Abstract: An orifice spiliway is a structure constructed at or near the dam site to dispose of surplus vater from the reservoir to the channel downstream. Orifice spiliways are provided for all darns as a safety measure against Overtopping and the consequent damages and failure. The purpose of this study is to examine the discharge characteristics of orifice spiliway under different approach flow conditions (with straight approach flow, oblique flow (r = 3.72 m) and oblique (r = 2 m) approach flow). For each approach flow condition, we had nine stages for performed whole experimental work. The whole experiments were performed for investigation of discharge characteristics of orifice type spiliway under oblique approach flow, and to study the variation of longitudinal velocity across the width of approach channel for different opening of gates & approach flow condition. It has been observed through analysis the flow characteristics of each hay are different for each approach flow condition. It also have been observed that for operation of same bay with different approach flow condition the discharge found to be highest for straight approach flow and lower for oblique approach flow (r = 2 m). It also has been observed that velocity variation across the channel found to be non uniform throughout the channel width for all approach flow conditions and it has been found that in straight approach the velocity variation across the channel was less non uniform as compare to oblique approach. Sat, 01 Jun 2013 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/18003 2013-06-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/18002 Title: STRUT-AND-TIE MODELLING OF DEEP BEAMS -AN APPRAISAL Authors: Vimal, Abhishek Abstract: The effect of the amount of transverse reinforcement on the efficiency factors of steeply inclined bottle-shaped struts made of normal-strength and high-strength concrete have been experimentally investigated. The amount of transverse reinforcement provided in the form of horizontally oriented rebars was taken as zero, 0.0031, 0.0046 and 0.0069 when expressed in terms of reinforcement ratio. The results show that efficiency factor was influenced by transverse reinforcement content and the steepest increase of 25% and 30% for the normal-strength and high-strength concrete bottle-shaped struts respectively was observed when the transverse steel was increased from zero to 0.003 1. The increase in strut efficiency factor for transverse reinforcement contents beyond 0.0031 was relatively small. Service load crack widths in all the bottle-shaped struts across all the transverse reinforcement contents under investigation were less than 0.3 mm. An optimum 0.003 transverse reinforcement ratio was confirmed for both normal-strength and high-strength bottle-shaped struts. Sat, 01 Jun 2013 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/18002 2013-06-01T00:00:00Z http://localhost:8081/jspui/handle/123456789/18001 Title: EFFECTS OF STEPS ON WIND LOADS ON TALL BUILDINGS Authors: Shiva Abstract: The aim of present study is to carry out extensive wind tunnel test on rigid models of ta buildings with various steps configuration for evaluating force coefficients, pressure 10 coefficient on different faces of building model. To carry out research work five building models are used which are made of plywood for force measurements and two models are of perspex sheet which is used for pressure measurement. The building models are made in the geometrical model scale ratio of 1:100. The models are tested under the boundary layer flow in an open circuit wind tunnel with a cross-section of 2 m (width) x 2 m (height) and the length of the section as 15 in. Floor roughing devices namely vortex generators, barrier wall, cubical blocks of size ISO mm. 100 mm and 50 mm are used on the upstream end of the test sections to achieve the mean wind velocity profile corresponding to terrain category 2 as per Indian Standard on wind loads. Various instruments are also used along with the data acquisition system for the base force f measurement and the surface pressure measurement over entire building models in the wind tunnel. The area of research in this report is to study wind loads on steps in tall building. The research contains experiment analysis of the various tall building models with various pattern of steps while keeping the floor area same in Boundary Layer Wind Tunnel. 'I'his report describes various alterations in the elevation of building and the wind load effect on these changes. It is observed that both base shear and base moments developed due to wind loads are not only influenced by wind directions, but these are also highly affected by steps. The research work also help us to guide to choose for suitable changes in building elevation which should be incorporated in the design so it will economize in terms of wind loads giving architects a better design opportunity. Sat, 01 Jun 2013 00:00:00 GMT http://localhost:8081/jspui/handle/123456789/18001 2013-06-01T00:00:00Z