Seismic performance and material-level damage evolution of retrofitted RC framed structures by high-performance AVED under different shear-span ratio

To upgrade the seismic performance of reinforced concrete framed structures with insufficient seismic capability, the high-performance acrylate viscoelastic dampers (AVED) are developed. A series of dynamic mechanical performance tests are carried out on high-performance AVED. A new strategy for retrofitting RC framed structures using AVED is proposed. To systematically study this new retrofitting structural system, the seismic performance of seven RC frame speci-mens and seven AVED-added RC frame specimens with different shear-span ratios of 2.0-8.0 are compared. On this basis, the influence rule of shear-span ratio on structural damage evolution is qualitatively analyzed. The structural damage evolution at material-level under different shear -span ratios is qualitatively comparted and analyzed in the whole process. The research results show that the self-developed AVED has excellent energy-consumption capability, and dynamic mechanical properties and energy-consumption capability are strongly dependent on frequency and displacement amplitude. The added AVED greatly improves the seismic performance of the retrofitted RC frame structure. At the same time, AVED effectively improves the failure mode of the structure and avoids the brittle failure mode of the beam-column joints under low shear-span ratios.

Automated summary

In order to enhance the seismic performance of reinforced concrete framed structures with insufficient seismic capability, high-performance acrylate viscoelastic dampers (AVED) have been developed. Dynamic mechanical performance tests have been carried out on high-performance AVED, and a new retrofitting strategy using AVED for RC framed structures is proposed. The seismic performance of seven RC frame specimens and seven AVED-added RC frame specimens with different shear-span ratios are compared to systematically study the new retrofitting structural system. The research results show that the self-developed AVED has excellent energy-consumption capability and greatly improves the seismic performance of the retrofitted RC frame structure.