http://nopr.niscpr.res.in/handle/123456789/66486 Fri, 09 Oct 2026 13:41:17 GMT 2026-10-09T13:41:17Z http://nopr.niscpr.res.in/handle/123456789/66495 Title: Critical review of codal provisions on the torsional irregularity Authors: Prakashvel, Jawahar; Umarani, Chockkalingam; Sathish Kumar, Kannaiyan Abstract: Buildings with irregularities have consistently been highly vulnerable to seismic events. The earthquake events have been showing the failure patterns of the reinforced concrete buildings with various irregularities. But the large number of buildings have been existing and being constructed with irregularities both in the urban as well as rural areas of developing countries. Various irregularities have been defined in international standards. But still, there is a need to study the combined irregularities of the building. In this study, the various country codal provisions on torsional irregularities in the reinforced concrete buildings have been reviewed and compared. Most of the codes have considered the edge displacements as the measure of torsional irregularity criteria. The amplification factorshave been used for structural eccentricity and accidental eccentricity to increase the design forces. The torsional flexibility based on the ratio of the natural period of torsional mode and translational mode, stiffness eccentricity ratio, and the mass factor based on the radius of gyration of mass about the center of mass of the building have been introduced in the draft code IS 1893-2023, Part-2. The limiting value have been prescribed by the code for torsional flexibility factor to prevent the failure of buildings due to torsional flexibility. In this paper, various significant factors affecting the seismic performance of the buildings due to torsional irregularity have been reviewed. Page(s): 299-306 Sun, 01 Jun 2025 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/66495 2025-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/66494 Title: Investigation of an electroplated NixFey film for magnetometer applications Authors: Das, Supriyo; Gopal, Ram Abstract: This paper has investigated the development of a microelectromechanical system (MEMS)-based magnetometer utilizing the ultraviolet-lithographie, galvanoformung, abformung (UV-LIGA) technique, with a structural layer composed of nickel-iron (NixFey) alloy. Earlier implementations of MEMS magnetometers using pure nickel as a structural material have encountered challenges due to high residual stress, which has led to performance degradation and mechanical instability. To address this, an optimized composition of Ni (87%) and Fe (13%) has been employed to minimize residual stress and enhance the structural integrity of the device. The proposed magnetometer has been fabricated on a boro-float glass substrate, which has been chosen for its low parasitic capacitance and reduced requirement for passivation layers. The design has incorporated a novel resonant structure with support arms positioned at the extreme ends of the beam, maximizing the overlap area between movable and fixed electrodes for improved sensitivity. The device has operated based on Lorentz force transduction, where an excitation current applied at the resonant frequency has interacted with an external magnetic field, inducing vibrations. Extensive experimental investigations have been conducted to optimize the electroplating process and reduce stress. Elemental analysis of the NiFe film has been performed using energy dispersive spectroscopy (EDS) to verify the composition. The mechanical sensitivity of the device has been measured as 237 pm/Gauss at atmospheric pressure using a Laser Doppler Vibrometer (LDV), demonstrating its high-performance capabilities. This work has reported a novel MEMS-based Lorentz force magnetometer with Ni87Fe13 as the structural layer, fabricated using the UV-LIGA process. The study has established a reliable methodology for the development of stress-free, high-sensitivity magnetic sensors, contributing to advancements in miniaturized sensing technologies for applications in navigation and industrial automation. Page(s): 307-312 Sun, 01 Jun 2025 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/66494 2025-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/66493 Title: Development of porous composite matrix using fly ash, waste tyre rubber, and rice husk ash for sustainable engineering applications Authors: Bisarya, Abhishek; Bhaskaran, Krishnakumar; Vijay, Ritesh Abstract: Utilization of fly ash (FA), waste tyre rubber (WTR), and rice husk ash (RHA) has grown as research towards handling the disposal issue and its environmental degradation concerns. The present research and development has delineated a sustainable porous composite matrix utilizing industrial and agricultural wastes with minimal content of cement and water. The research study has included three phases of development such as FA-Cement; FA-WTR-Cement; and FA-WTR-RHA Cement. Two optimized matrices FA-WTR-RHA-Cement (50%+20%+10%+20% and 50%+15%+15%+20%) by weight have exhibited density of 1.4 g/cm³, compressive strength of 8.0 and 8.8 N/mm2, and system porosity of 61% and 60.5% respectively. FESEM and EDX have further validated a stable internal microstructure characterized by well-integrated waste particles, thereby improving the functionality of the matrix. A leachability study has also been carried out on the optimized matrices, with results well below the regulatory levels. Overall, the developed composite has offered a low-carbon, eco friendly alternative to traditional materials, without any chemicals/additives, pre- and post-treatment of the waste, for sustainable civil and environmental engineering applications. Page(s): 313-322 Sun, 01 Jun 2025 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/66493 2025-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/66492 Title: Non-destructive assessment of heat-damaged concrete Authors: Chaturvedi, Aparna; Gaikwad, Mahesh; Kishor Banjara, Nawal; Singh, Suvir Abstract: The damage assessment of concrete exposed to different temperatures has been essential to ensure structural safety and residual behavior. High temperatures have significantly weaken the integrity of concrete, which may have lead to partial or complete failure of concrete elements under loading conditions, posing safety risks. To investigate the extent of damage caused by high temperatures, an experimental study has been conducted involving visual inspection and non-destructive testing. Concrete cubes have been exposed to elevated temperatures under steady-state heating conditions, and the UPV test has been performed after they have been completely cooled to ambient conditions. Based on the test findings, a temperature-dependent relationship has been established for UPV velocity and transit time. The test results have indicated that cubes exposed to elevated temperatures exhibit a significant reduction in UPV values compared to unexposed cubes, with the extent of damage having increased with temperature. Developed temperature-dependent equations have aided in determining the quality of concrete after exposure to various temperature ranges. This study has aided in understanding the degree of damage at elevated temperatures. Page(s): 323-330 Sun, 01 Jun 2025 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/66492 2025-06-01T00:00:00Z