Comparison of Seismic Response Corner Beam-Column Joint with and without Fuse Bars Under In-Plane Lateral Cyclic Loading

Nurfarhana Diyana Hadi,Nor Hayati Abdul Hamid,Yeri Sutopo,Bao Chao,Nurul Azmi Zainuddin,Rohana Hassan,Ili Farhana Azmi

doi:10.1590/1679-78256581

Abstract

Two full-scale corner beam-column joints with and without fuse bars were designed, constructed, tested, analyzed and modeled under in-plane lateral cyclic loading presented herein. The first specimen was designed using Eurocode 8 and equipped with four fuse bars. Second specimen was designed using BS8110 (non-seismic code of practice) with corbel. All the specimens have similar size of foundation beams, columns and beams. Visual observation during testing showed that specimen with fuse bars suffered less damage as compare with specimen without fuse bars. Furthermore, specimen with fuse bars has higher lateral strength capacity, stiffness, ductility and equivalent viscous damping than specimen without fuse bars. Finally, there is good agreement of lateral strength capacity, ductility, stiffness and equivalent viscous damping which lies between 2% and 20% between experiment and modeling hysteresis loops. Thus, it is recommended that fuse bar as a green structural material can be installed inside the corner beam-column joint for RC buildings to cater strong earthquakes in high seismic regions.

Highlights

The ability of a seismic structure to withstand earthquake load relies heavily on the design of the structure itself using seismic code of practice
The input parameters were used to model these hysteresis loops and calculate the seismic performance parameters known as ultimate lateral strength capacity, ductility, stiffness and equivalent viscous damping
Based on the comparison of seismic behaviour and hysteretic response of CJ-2B Specimen with fuse bars and BC12C Specimen without fuse bars under in-plane lateral cyclic loading, the following conclusions and recommendation can be drawn as follows: 1. CJ-2B Specimen can withstand an ultimate load of up to 88.85kN in pushing direction and -100.37kN in pulling direction before experiencing strength degradation and these values are bigger than BC1-2C Specimen

Summary

Introduction

The ability of a seismic structure to withstand earthquake load relies heavily on the design of the structure itself using seismic code of practice. Seismic design focuses on optimizing the global ductile behavior of a structure. Ductile design enables the structure to undergo inelastic deformations while most of the energy is dissipated through hysteretic behavior. Some researchers argued that it is necessary for such requirement when there are more economical and better solutions available [1]. This applies especially to regions with low to medium magnitude of earthquake in moderate seismic regions. Seismic fuse bars known as mechanical energy dissipators are made from high yield reinforcement bars by trimming and reduce the diameter at mid-span which classified as Passive Protective Systems. Most common structural fuse were used in frame and connections are plates [7,8] and bars to resist the earthquake loads [9,10]

Methods

Results

Conclusion