Abstract- The rapid growth of urban population and increasing demand for efficient transportation systems have led to the development of modern metro rail networks in metropolitan cities. Elevated metro bridge structures are widely adopted due to their advantages such as reduced land acquisition, faster construction, and minimal disturbance to existing traffic. Among various structural systems, prestressed concrete (PSC) box girder bridges are commonly used in elevated metro structures because of their high strength, durability, better load distribution, and excellent torsional rigidity. However, these structures are subjected to different types of loads during their service life, such as dead load, live load, wind load, temperature effects, and dynamic loads due to moving trains. Among these, seismic load is one of the most critical factors, especially in earthquake-prone regions. Earthquake forces can induce significant stresses, displacements, and vibrations in bridge structures, which may affect their safety, stability, and serviceability. Therefore, it is essential to study the seismic performance of elevated metro bridge structures to ensure safe and economical design. The present study focuses on the seismic performance assessment of prestressed concrete box girder bridges used in elevated metro systems. Two different types of box girder configurations, namely rectangular box girder and trapezoidal box girder, are considered for analysis. These configurations are selected because they are widely used in practical bridge construction and exhibit different structural characteristics. The study aims to compare their performance under both static and dynamic loading conditions and to identify the most efficient and suitable girder configuration. The analysis of the bridge superstructure is carried out using SAP2000 software, which is based on the Finite Element Method (FEM). The modeling includes realistic geometry, material properties, boundary conditions, and loading conditions as per Indian Standard codes such as IRC and IS 1893. Static analysis is performed to evaluate parameters such as bending moment, shear force, and deflection under dead load, live load, and prestressing force. Dynamic analysis is carried out using response spectrum method to assess the seismic behavior of the structure. Keywords: Prestressed Concrete, Box Girder Bridge, Elevated Metro Structure, Seismic Analysis, Response Spectrum Method, SAP2000.
Meshram et al. (Sat,) studied this question.