Sixth International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics August 1 – 6, 2016, IIT Roorkee Extension Centre, 20 Knowledge Park II, Greater Noida, India Paper No. XXX 1 BEHAVIOR OF RC FRAMES UNDER MONOTONIC AND CYCLIC LOADING K. Senthil., K.S. Satyanarayanan., S. Rupali Department of Civil Engineering National Institute of Technology Jalandhar, Jalandhar, Punjab 144011 Department of Civil Engineering SRM University, Kattankulathur, Kancheepuram, TamilNadu 603203 Department of Civil Engineering Indian Institute of Technology Roorkee Roorkee, Uttarakhand 247667 ABSTRACT The objective of the present work is to evaluate the influence of two different methods of improving the ductility of Reinforced Concrete Frames and their influence on the full range behavior of the frames with M40 grade of concrete. For this purpose one fourth scale reinforced concrete square frames are experimentally tested subjected to static cyclic loading for three cases and monotonic loading for one case. The parameters are varied as method introducing ductility to the frame viz. (i) by using conventional concrete (ii) adding 1% of steel fibres by volume of concrete at hinging zones (iii) using self-compacting concrete with fibres at hinging zones. The behavior of frames tested under cyclic loading have revealed that there is a positive trend in improvement of ductility of frames when fibreous concrete is used along with self-compacting concrete. INTRODUCTION In recent times it is witnessed that many people have been killed during the occurrence of earthquakes. The loss of life of people is not due to earthquake but, due to lack of construction and detailing aspects to make the structure to behave in a ductile manner. Lakshmipathy (2003) has carried out investigations on reinforced concrete sub-assemblies, elements and frames with three different methods for improving ductility, namely, use of conventional reinforcement as suggested by IS code (13920 : 1993), provision of inclined bar reinforcement at the joints and use of fibrous concrete at joints. It was observed that the use of fibrous concrete at joints improves the ductile behavior of frames to the maximum level. Anitha and Jaya (2005) investigated the effect of Self Compacting Concrete in improving the ductility of reinforced concrete frames. It was concluded that the Self compacting concrete frame had more ductility than the ordinary concrete frame. Said and Nehdi (2007) carried out experiments on full scale beam column joint specimens to compare the performance of normal concrete (NC) and self-consolidated concrete (SCC). They concluded that the SCC beam column joint specimen performed adequately in terms of the mode failure and ductility requirements. Ashtiani et al. (2014) studied six beam-column joint specimens made of high- strength self-compacting concrete, conventionally vibrated high-strength concrete, and normal strength conventionally vibrated concrete. These specimens were designed, fabricated, and tested under reversed cyclic loading. All specimens showed a relatively ductile behavior as opposed to the general notion of brittle failure in high-strength concrete. Ganesan et al. (2014) carried out an experimental investigation to study the effect of steel and hybrid fibres on the strength and behavior of high performance concrete beam column joints subjected to reverse cyclic loads. They found that the combination of steel fibres and polypropylene fibres gave better performance with respect to energy dissipation capacity and stiffness degradation than the other combinations. The design recommendation (ACI-ASCE Committee 352, 1985) stipulates to provide reinforcement cage with closely spaced vertical and horizontal reinforcement in the critical zones. But this results in congestion at the joints in real three dimensional multi-storey frames where three or more members at the joints, leading to construction difficulties. Based on the literature survey, the beam column joints in a reinforced concrete frame are found to be critical. To avoid damage in the joints, closely spaced stirrups called special confined reinforcement are provided. So congestion of reinforcements occurs, resulting in poor compaction of concrete. This problem of placing and compaction of concrete in beam column joints can be solved if self-compacting concrete is used instead of conventional concrete. The objective of the present study is to investigate the influence of different materials at hinging zones of the frame