Pseudo-static topology optimization using the evolutionary-type method for reinforced concrete shear walls

Abstract

For improved ductility in seismic-design reinforced concrete shear walls, a methodology referred to as pseudo-static topology optimization is incorporated to guide the design process. This approach involves a stepwise elimination of elements from the initial structural configuration, under specified conditions such as reciprocating loads, displacement constraints and volume limitations. The primary objective of this optimization is to maximize the structural capacity for energy dissipation. This is achieved by creating a sensitivity analysis based on variations in cumulative plastic strain energy resulting from element deletions. The final optimized topologies exhibit bar structures with exceptional capacity for energy dissipation. These optimized configurations evolve with changes in height–width ratios and axial compression ratios, shifting from structures with uniform energy dissipation to those with a two-level distribution. Furthermore, the orientation of the main bars changes from folded bars on both sides to inclined straight bars, depending on the specific conditions.