Srivastava, GauravGauravSrivastavaRavi Prakash, P.P.Ravi Prakash2025-08-302025-08-302017-10-0110.1016/j.compstruc.2017.05.0132-s2.0-85020855049https://repository.iitgn.ac.in/handle/IITG2025/22380A novel coupled framework for analysis of reinforced concrete (RC) and steel planar frames subjected to fire is developed with three-way coupling between heat transfer, mechanical deformations and pore pressure build-up. Structural members are discretized in space using a two-level scheme where the mechanical solver utilizes 1D line elements, and the thermal and the pore pressure solvers work on 2D finite element (FE) meshes for each sub-span used by the mechanical solver. Such a strategy enables consideration of effects of large deformations, temperature-dependent material properties (thermal, moisture transport and mechanical), and spalling. None of the earlier developed frameworks considered a three-way coupling between mechanical, thermal and pore pressure solvers without employing a full-fledged 3D FE scheme. A matrix method type approach, developed herein, enables modeling of the three main physical processes taking place in RC members during fire without the need to consider full-fidelity 3D FEM. Several numerical examples are presented to demonstrate the accuracy and applicability of the developed framework in fire analysis of normal and high strength RC and steel structures.en-USfalseHigh strength concrete (HSC) | Normal strength concrete (NSC) | Spalling | Steel structures | Thermo-hydro-mechanical analysis | Three-way couplingArticle173-1851 October 20171314WOS:000405974600011