MUMBAI, India, July 7 -- Intellectual Property India has published a patent application (202641060285 A) filed by Dr. Sathyakumar. N on May 12, 2026, for A Comparative Study On Effectiveness Of Rigid And Semi Rigid Diaphragm On Rc Structures.
Inventors include Dr. Sathyakumar. N; and Mathivathani P.
The application for the patent was published on July 03, 2026, under issue no. 27/2026.
Abstract: The horizontal diaphragm is a fundamental component of a building's seismic force-resisting system, governing the transmission of inertial forces to vertical lateral load-resisting elements. However, the influence of diaphragm in-plane flexibility on the overall seismic response of reinforced concrete (RC) frame buildings—particularly when combined with different supplementary lateral load- resisting (LLR) mechanisms—remains insufficiently quantified in design practice. This study presents a comparative seismic performance evaluation of eight RC frame structural configurations encompassing rigid diaphragm (RD) and semi-rigid diaphragm (SRD) assumptions, each combined with three classes of LLR systems: corner shear walls, masonry infill walls, and X-type steel bracings, A G+10-storey OMRF building (plan; 18.288 m x 12.192 m) located in seismic Zone V was modelled and analyzed in ETABS 2020 using the Response Spectrum Method in accordance with TS 1893 (Part 1): 2016. Key seismic performance indices nainely inter-storey drift ratio, storey shear, lateral displacement, and modal periods and frequencies—were extracted and compared across all eight models. Results demonstrate that all configurations satisfy the permissible drift limit of 0.004H prescribed by IS 1893. The rigid diaphragm with comer shear walls (Model 2) yielded the minimum drift (0.001274 in the X-direction), while masonry- infilled frames produced the highest lateral stiffness and the lowest maximum displacement (4.97 mm). Modal analysis revealed that semi-rigid diaphragm models exhibit marginally longer fundamental periods than their rigid counterparts, confirming the stiffness- reducing effect of in-plane flexibility. The findings provide quantitative guidance for selecting optimal diaphragm-LLR system combinations for RC buildings in high- seismicity regions.
Disclaimer: Curated by HT Syndication.
