28In this study new types of advanced hybrid shear wall systems using steel/fibre reinforced 29 polymer (FRP) composites are being developed for deployment in the construction of 30 buildings. The hybrid steel/FRP shear walls made from laminates of steel with either carbon 31 FRP (CFRP) or glass FRP (GFRP) materials. In total six medium-scaled shear wall 32 specimens were manufactured. In the first phase of the study three pristine specimens: steel 33 shear wall (SSW-P), hybrid steel /CFRP shear wall (HSCSW-P) and hybrid steel/GFRP 34 shear wall (HSGSW-P) were tested. In the second phase of the project, the specimens 35 tested in phase one were retrofitted and retested; these specimens were identified as SSW-36 R, HSCSW-R and HSGSW-R. The structural repair and strengthening of specimens in the 37 second phase was achieved by replacing the damaged infill plates with new infill plates of the 38 same type, strengthening of the vertical steel frame elements with CFRP laminates and 39

Introducing of lightweight lateral load resisting systems, such as steel shear walls (SSW) is very beneficial for multi-storey buildings. Further improvement of such elements via introducing fibre reinforced polymer (FRP) materials is expected to allow increasing of their ultimate load capacity, stiffness and energy absorption. The aim of presented research is to compare the behaviour of modified SSW via inclusion of FRP in infill plate design. Produced and tested samples are three different types: with steel infill plate (control), with FRP infillplate and with hybrid steel/FRP infill plate. All samples are loaded under quasi-static cyclic seismic testing load as defined in ATC 24 protocol (ATC 24, 1992). The highest ultimate load capacity and lowest stiffness degradation is achieved for sample with glass FRP infill plate, followed by hybrid (carbon FRP/steel and glass FRP/steel) samples. Highest cumulative energy absorption for predominant part of the investigated amplitudes was achieved forhybrid samples. The obtained results indicate that the innovative shear walls with FRP and hybrid infill plates offer excellent load capacity and energy absorption, relatively small loss of stiffness and potential for increased durability in comparison with conventional SSW systems.

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