Parametric Study and Optimization of SMA U-Shaped Dampers with Varying U-Plate Cross-Sectional Shapes Anant Parghi, Apurwa Rastogi, Jay Gohel, Arefeh Emami Journal of Structural Design and Construction Practice, 2025 This research presents the seismic performance of shape memory alloy (SMA) U-dampers (SMA-UDs) by modifying the cross-sectional design of the U-plates while maintaining their area constant. Three-dimensional finite-element analyses are performed to investigate the modified SMA-U-plate designs’ cyclic response and deformation mechanism. Firstly, the simulation results of the reference SMA-UD model are initially verified using preexisting experimental data. Then, the mechanical properties of all modified SMA-U-plate designs are evaluated at 0° and 90° loading directions. In addition, the technique for order of preference by similarity to the ideal solution, the TOPSIS method, is employed to rank the most favorable alternative among all modified U-plate designs, depending on their mechanical properties. A parametric study is conducted on the best-ranked SMA-UD to evaluate the effects of variation in geometrical properties, including its unfastened straight length, thickness, width, and height as design variables. The results show that the mechanical properties are impacted by the loosened straight section’s size and the U-plate’s thickness. The results further reveal that changing the SMA-UD cross-sectional form from a rectangle to trapezium boosted the ultimate load and energy dissipation capabilities under in-plane load to 37.14% and 25.58%, respectively, while maintaining equal area. Similarly, when subjected to out-of-plane stress, the ultimate load and energy dissipation capacities increased by 8.34% and 9.52%, respectively.
Numerical Investigation of Wave Overtopping in Impermeable Seawalls Coated with Sand-Based Porous Media Arefeh Emami, Elaheh Elahian, Anant Parghı, Meisam Qorbani Fouladi Numerical Methods in Civil Engineering, 2025 A seawall's structural integrity can be damaged by wave overtopping. To mitigate wave overtopping, this study investigates the effectiveness of incorporating a porous layer into impermeable seawalls. A numerical model wave was developed using a finite volume method and first validated by simulating an impermeable seawall without a porous layer, showing a 90% agreement with laboratory data. Applying a porous sandstone layer on the seaward face of the impermeable seawall followed this validation. A study was conducted to investigate the impact of various characteristics of the porous layer on the reduction of overtopping discharge, including thickness, porosity, and grain size. It was found that increasing the thickness of the porous layer (up to 2 m) resulted in a 60% reduction in overtopping discharge, while all other parameters remained constant. Moreover, increasing the porosity of the sand layer improved the reduction rate by 67%, indicating enhanced energy dissipation and absorption capacities. Using grain sizes of 0.2–1 mm and 2–3 mm reduces overtopping discharge by 35.57% and 66.2%, respectively. The results of this study demonstrate that the proposed approach is a viable and practical method of reducing wave overtopping.
Physical and mechanical properties of mortars containing incinerated sludge ash and silica fume American Concrete Institute ACI Special Publication, 2017
Axial stress-strain behavior model of frp-confined concrete: A state of the art review Proceedings Annual Conference Canadian Society for Civil Engineering, 2015
Analysis of RC circular bridge columns retrofitted with fiber reinforced polymer under axial and lateral cyclic loading Proceedings Annual Conference Canadian Society for Civil Engineering, 2015
Influence of steel fiber variation on impact strength of reactive powder concrete International Journal of Earth Sciences and Engineering, 2010