Abstract
Traditional steel structure joints are prone to brittle failure under seismic excitation, and it is difficult to precisely control the location of the resulting plastic hinge or repair these joints after an earthquake. Therefore, based on the energy dissipation principle of the friction pendulum isolation bearing and automobile braking device, a low-cost friction-based plastic hinge (PH) joint is proposed to provide predictable energy dissipation and realize quickly repairable structures. The proposed PH was analysed theoretically, and five half-scale specimens using different bolt and friction materials were tested using cyclic reversing load. The test results showed that models PH-1 and PH-2 with Grade 4.8 and 8.8 limiting bolts, respectively, both provided a plastic rotation angle greater than 0.03 rad, exhibited experimental moment capacities of 0.91 and 0.93 times their theoretical capacities, and exhibited ductility coefficients of 2.75 and 3.14, respectively. It was found that high-strength limiting bolts were unsuitable as they damaged difficult-to-replace PH components. The selected PH configuration experienced damage to only the limiting bolts and friction plates and exhibited good plastic deformation capacity and hysteretic energy dissipation performance that met the plastic rotation, ductility, and friction energy dissipation requirements. Thus, the proposed PH can be used to improve the seismic performance of beam-to-column joints and the frames they form.
Highlights
Ever since large area brittle failures of beam-to-column joints were observed following the 1994 Northridge earthquake in California, USA, and the 1995 Kobe earthquake in Japan, many scholars have conducted experimental and theoretical studies on the seismic and ductile properties of beam-to-column joints in steel structures [1,2,3,4,5,6]
For models plastic hinge (PH)-1 and PH-3, which were chosen as exemplary of the PH joint behaviour, the four limiting bolts were Grade 4.8 M10 ordinary bolts, the tightening torque of the loading rotary bolt was 250 N m, and the friction materials were rubber plates and composite resin plates, respectively
Under the displacement load applied to the end of the test model beam, the limiting shears of the Grade 4.8 ordinary bolts and Grade 8.8 high-strength bolts were selected as the working conditions of test models PH-1 and PH-2, respectively
Summary
Ever since large area brittle failures of beam-to-column joints were observed following the 1994 Northridge earthquake in California, USA, and the 1995 Kobe earthquake in Japan, many scholars have conducted experimental and theoretical studies on the seismic and ductile properties of beam-to-column joints in steel structures [1,2,3,4,5,6]. The results of these studies indicate that an effective way to prevent the brittle failure of beam-to-column joints is to move the plastic hinges out of the columns. It is easy to repair or replace after the earthquake
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