The load-bearing capacity of bridges is critical to their structural integrity and longevity. In this work this capability is assessed using an integrated method combining computational calculations and experimental testing, with focus on static and dynamic loading situations. The numerical part relies on finite element modelling (FEM) to simulate the behaviour of bridges under different load situations, investigating characteristics such as stress distribution, deflection patterns, and modal frequencies. Experimental validation is performed using static load application and dynamic excitation methods, such as impact hammer testing and ambient vibration monitoring. The combination of these alternative methodologies offers a thorough view of structural response, pinpointing important failure causes and serviceability constraints. Static response characteristics, e.g. deformation and strain behaviour, are determined under a controlled loading regime to define the immediate structural responses. Dynamic metrics like frequency response and energy dissipation ratios are analysed to evaluate sustained performance and to identify underlying defects. The reliability of the evaluation is enhanced when the computational predictions agree with the experimental observations. Any differences are corrected via model calibration, therefore enhancing the accuracy of the future predictions. The study evidences the need for the use of both analytical and physical testing techniques for a comprehensive evaluation of the capacity, so as to improve the safety of infrastructure management and the operational efficiency. The results show that dynamic assessment complements static evaluation by revealing small structural alterations that static testing alone may ignore. The suggested framework provides a realistic way for engineers to improve the prediction of load-bearing capacity and enable informed maintenance and retrofitting choices. This study promotes bridge evaluation procedures and contributes to sustainable infrastructure development via hazard avoidance and the effective allocation of resources. This is especially true for the aging bridge fleet, where accurate assessment of capacity is critical to prolonging the remaining service life.
Junaid Farooq, Dr. V.K Saini, Dr. S.K Chandel· International research journ...· 0 citations
The relationship between the ground and structural system is crucial for the seismic performance of high-rise reinforced concrete edifices. Traditional seismic design approaches typically assume a fixed-base condition, overlooking the flexibility of the underlying soil layers. Soil-structure interaction (SSI) can significantly affect the seismic response by altering natural frequencies, damping ratios, and the overall dynamic behaviour of the structure. This study investigates the influence of soil-structure interaction (SSI) on the seismic performance of high-rise reinforced concrete (RC) edifices, highlighting various soil conditions, structural configurations, and ground motion characteristics. Finite element modelling and time history analyses are employed to simulate real seismic events, highlighting the necessity of including soil flexibility into design approaches to improve structural safety. A thorough parametric analysis is conducted by modelling high-rise reinforced concrete structures of varying heights and stiffness on multiple soil types, including soft clay, medium-dense sand, and hard rock. The results demonstrate that structures on softer soils experience increased lateral displacements, prolonged fundamental periods, and elevated base shear demands relative to those on stronger soils. Moreover, the extent of soil-structure interaction escalates with taller and more flexible structures. The study investigates the critical role of foundation system types—namely shallow vs deep foundations—in mitigating adverse soil-structure interaction impacts. Critical findings indicate that neglecting SSI may lead to an underestimation of seismic demands, hence compromising structural integrity during major earthquakes. Recommendations are provided for incorporating SSI considerations into the seismic design of high-rise reinforced concrete structures based on the findings. The study emphasises the necessity for integrated modelling approaches that account for the interdependent impacts of soil and structure under dynamic loading situations. It advocates for performance-oriented design solutions that incorporate site-specific soil properties to enhance resilience against seismic events. Understanding soil-structure interaction allows engineers to generate more accurate predictions of building performance, leading to safer, more economical, and sustainable designs in seismically active regions.
Showkat Ahmad Shah, Dr. V.K Saini, Dr. S.K Chandel· International research journ...· 0 citations
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