Progressive collapse of asymmetrical reinforced concrete frames under corner column removal: Experimental investigation M. Prakash, K.S. Satyanarayanan, N. Parthasarathi Results in Engineering, 2025 • The Progressive collapse of two bay five storey RC frame buildings under corner column removal were assessed. • The failure pattern of the buildings verified both bare and Infilled frame. • Infilled frame significantly improves the progressive collapse of RC frame. This study investigates the progressive collapse behavior of asymmetrical reinforced concrete (RC) frames, comparing bare and infilled frame configurations. Experimental and analytical results are evaluated under a 50 % working load with a focus on load-deflection behavior, displacement, and crack development. The collapse process is classified into three primary stages: initial (elastic), compressive, and catenary stages. For the bare frame, the initial stage shows elastic behavior up to 2 Tons with a displacement of 0.44 mm. The compressive stage is characterized by plastic hinge formation at beam ends, leading to increased deflection. Maximum horizontal deflection reaches 8 mm at 16 Tons before the frame returns to its original position. After corner column removal, the vertical displacement increases from 4 mm to 7 mm in the fifth storey. Several load drops observed in the deflection curve are attributed to rebar fractures. In the infilled frame, the elastic stage persists up to 2 Tons with a displacement of 0.3 mm. Maximum horizontal displacement is reduced to 3 mm at 8 Tons due to the infill's contribution to structural resistance. After corner column removal, vertical displacement increases slightly from 2 mm to 3 mm on the fifth storey. Ultimate load tests reveal a marked difference in deflection behavior between the two configurations. The bare frame reaches a maximum deflection of 5 mm at 25 Tons before entering the catenary stage, where beam failure dominates. In contrast, the infilled frame achieves greater ultimate load resistance, with a maximum deflection of 4 mm at 43Tons. The bare frame exhibits a shear mode of bending at the column removal location, while the infilled frame transitions to a bending-dominant failure mode. Crack propagation patterns align with the progressive collapse stages. In the bare frame, initial cracks develop above the removed column bay, intensify during the compressive stage, and propagate to adjacent bays during the catenary stage. Final damage is concentrated at beam ends near the column removal area. Infilled frames exhibit limited cracking in the initial and compressive stages, with minor cracks forming only near the column removal area at higher loads, demonstrating enhanced resilience. This study shows that infilled frames are better at resisting collapse than bare frames because they can handle higher loads and have smaller deflections. Understanding how these frames behave and fail helps in designing stronger and safer structures that can resist progressive collapse more effectively.
Development and testing of a thermal self-straining preloading test setup for reinforced concrete beams and slabs to perform thermomechanical action M. Vishal, К.С. Satyanarayanan, M. Prakash, Rakshit Srivastava, V. Thirumurugan International Journal of Structural Integrity, 2024 Purpose At this moment, there is substantial anxiety surrounding the fire safety of huge reinforced concrete (RC) constructions. The limitations enforced by test facilities, technology, and high costs have significantly limited both full-scale and scaled-down structural fire experiments. The behavior of an individual structural component can have an impact on the entire structural system when it is connected to it. This paper addresses the development and testing of a self-straining preloading setup that is used to perform thermomechanical action in RC beams and slabs. Design/methodology/approach Thermomechanical action is a combination of both structural loads and a high-temperature effect. Buildings undergo thermomechanical action when it is exposed to fire. RC beams and slabs are one of the predominant structural members. The conventional method of testing the beams and slabs under high temperatures will be performed by heating the specimens separately under the desired temperature, and then mechanical loading will be performed. This gives the residual strength of the beams and slabs under high temperatures. This method does not show the real-time behavior of the element under fire. In real-time, a fire occurs simultaneously when the structure is subjected to desired loads and this condition is called thermomechanical action. To satisfy this condition, a unique self-training test setup was prepared. The setup is based on the concept of a prestressing condition where the load is applied through the bolts. Findings To validate the test setup, two RC beams and slabs were used. The test setup was tested in service load range and a temperature of 300 °C. One of the beams and slabs was tested conventionally with four-point bending and point loading on the slab, and another beam and slab were tested using the preloading setup. The results indicate the successful operation of the developed self-strain preloading setup under thermomechanical action. Research limitations/implications Gaining insight into the unpredictable reaction of structural systems to fire is crucial for designing resilient structures that can withstand disasters. However, comprehending the instantaneous behavior might be a daunting undertaking as it necessitates extensive testing resources. Therefore, a thorough quantitative and qualitative numerical analysis could effectively evaluate the significance of this research. Originality/value The study was performed to validate the thermomechanical load setup for beams and slabs on a single-bay single-storey RC frame with and without slab under various fire possible scenarios. The thermomechanical load setup for RC members is found to be scarce.
Thermal behaviour of reinforced concrete beam with static loading condition Department of Civil Engineering, SRM Institute of Science, Technology, Chennai, India., N. Parthasarathi*, K.S. Satyanarayanan, Department of Civil Engineering, SRM Institute of Science, Technology, Chennai, India., V. Thamilarasu, Department of Civil Engineering, SRM Institute of Science, Technology, Chennai, India. International Journal of Recent Technology and Engineering, 2019
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