Applications of Shape Memory Alloys in Control of Buildings Under Seismic Loads

摘要

Shape memory alloys(SMAs)are a class of materials that possess the ability to undergo large deformations,while returning to their original undeformed shape.These materials also have a highly reliable energy dissipation mechanism,based on a repeatable solid state phase transformation.Recent advances in materials science and metallurgy have resulted in greatly improved properties for shape memory alloys,particularly for material sizes required for applications in control of structural systems,such as buildings or bridges.In this study,the properties of shape memory alloys are optimized for applications in earthquake control of building structures.Using shape memory alloys in the form of bars,a combination of analytical and experimental studies are performed on building systems with shape memory alloy components in their superelastic form.Reduced scale testing and analysis of an SMA bracing system illustrates the effectiveness of SMAs to reduce the peak displacements in typical buildings.