Abstract
A passive damper with a wire-woven bulk Kagome truss design was recently developed; its applicability as a passive damper to improve the seismic performance of building systems, including shear hysteresis behavior, energy dissipation capacity, and fatigue, was confirmed by material tests. The Kagome truss, a periodic cellular metal type, is composed of evenly distributed helical wires with a constant pitch and helical radius in six directions. The purpose of this study was to develop a new passive damper system for seismic strengthening of existing reinforced concrete (RC) frames. The proposed external connection methodology uses a wire-woven bulk Kagome truss (i.e., a Kagome damper external connection (KDEC) system), to dissipate earthquake energy using the dynamic interaction among an existing building, a support structure, and the Kagome damper installed between them. Four test specimens were designed and then strengthened with the KDEC system. Cyclic loading and pseudodynamic tests were conducted; lateral load-carrying capacity, deformation, and hysteresis characteristics were investigated, as well as the maximum response strength, response ductility, and earthquake damage degree, and compared to a control sample. Test results revealed that the KDEC system effectively dissipated the earthquake energy, showing considerable resilience under large-scale earthquake conditions.
Highlights
It has been widely recognized that the earthquake load is the most important factor in the structural design of building systems
We have described a new seismic retrofitting approach, which is an external connection methodology using a wirewoven bulk Kagome truss (KDEC system) that dissipates earthquake energy by a dynamic interaction among an existing building structure, a support structure, and a wirewoven bulk Kagome damper installed between them
An existing reinforced concrete (RC) frame building was selected to assess the seismic strengthening effect of the KDEC system proposed in this study
Summary
It has been widely recognized that the earthquake load is the most important factor in the structural design of building systems. Calculation procedures for shear forces and dynamic responses based on those research results have been developed and adopted in seismic design codes and standards over recent decades, including ASCE 710 [1], AIJ 2010 [2], ACI 318-14, and ACI 318R-14 [3]. Progress in the art of seismic design has resulted in new buildings with improved prospects of satisfactory behavior during an earthquake. Techniques to improve the deformation capacity of existing structural members include jacketing with steel plates, jacketing with steel bands, and jacketing with welded wire fabric and covering concrete. These conventional methods have several disadvantages, such as an increase in mass, the requirement for precise construction, and foundation reinforcement problems.
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