NEW DETAILS OF HSC BEAM-COLUMN JOINTS FOR REGIONS OFLOW TO MODERATE SEISMICITY

摘要

An experimental investigation was conducted to examine the feasibility of two kinds of new jointdetailing for low to moderate seismic risk regions. Particular attention was paid to beam-column jointscast of high-strength concrete (HSC). Joints without transverse reinforcement (E detail) commonlyadopted in low to moderate seismic risk regions have been proven unsatisfactory for strength and ductilityrequirements under seismic loading, while conventional joints containing transverse reinforcement (Hdetail) commonly adopted in seismic regions cannot avoid reinforcement congestion. Two kinds of newjoint details, i.e. AD (adding diagonal steel bars in the joint) and CD (bending some of the beamlongitudinal reinforcement bars diagonally up and down in the joint) are proposed in this study to satisfythe limited ductility requirements for low to moderate seismic risk regions. Four half-scale beam-columnjoint specimens cast of HSC containing respectively E detail, H detail, AD detail and CD detail werefabricated and tested under reversed inelastic cyclic displacement excursions. The test results showedthat, depending on the reinforcement detailing within the beam-column joints, different failure modesoccurred. Units E and CD could hardly reach the limited ductility range and the joint suffered severeinelastic damage, while Units AD and H behaved excellently with the joint relatively well intact. It isconcluded that the detail of Unit AD is suitable for joints in regions of low to moderate seismicity due toease of fabrication compared to Unit H.