FINITE ELEMENT ANALYSIS AND REINFORCED CONCRETE STAIRCASE DESIGN

Abstract

This study investigates the finite element analysis and structural design of a reinforced concrete staircase in a multi-story building using ETABS software. The staircase was modeled within the global ETABS framework, and relevant loads were applied in accordance with Vietnamese standards. Internal forces, including bending moments and shear forces, were extracted using finite element method (FEM)-based analysis. Reinforcement detailing was carried out following TCVN 5574:2018. The maximum positive bending moment of 42.6 kNm, negative support moment of 35.2 kNm, and maximum shear force of 28.4 kN were obtained. Serviceability checks showed a maximum deflection of 5.2 mm, which is below the allowable limit of L/250. Reinforcement detailing consisting of 4Ø16 bottom bars and 3Ø18 top bars satisfied TCVN 5574:2018 requirements.