New type of friction self-centering brace with displacement amplification function and its application in double column piers
WANG Debin1，HE Jie1，SUN Zhiguo2，WANG Dongsheng3
1.School of Civil Engineering, Dalian Jiaotong University, Dalian 116028, China;
2.Key Laboratory of Building Damage Mechanism and Defense, School of Disaster Prevention and Technology, China Seismological Bureau, Beijing 101601, China;
3.College of Civil Engineering and Communications, Hebei University of Technology, Tianjin 300401, China
Abstract：The energy dissipation function could not be fully used in the traditional self-centering braces. A torsional friction self-centering brace with displacement amplification function (SC-DARFB) was proposed based on the working principle of the bridge type amplifier. The basic structure and working principle of the SC-DARFB was introduced, and its theoretical restoring force model was proposed. The mechanical properties of the braces under different initial amplification angles were studied by numerical simulation, and the seismic response of the double-column pier with SC-DARFB was analyzed. It is found that the hysteretic performance of the SC-DARFB can be effectively described by the proposed theoretical restoring force model, which is in good agreement with the numerical simulation results. With the decrease of the initial amplification angle, the slip load, the maximum load and the energy dissipation capacity of the SC-DARFB are significantly improved, and the SC-DARFB shows good self-centering ability. Reasonable design would ensure that the maximum tension/compression load ratio meets the limit of 1.3 in the American Steel Structure Code. As a result, it is suggested to use an inverted V-shaped symmetrical SC-DARFB. The maximum displacements and residual drift ratio of the double-column piers would be decreased significantly by using the SC-DARFB. The seismic dissipation capacity of the double-column piers can be further improved by reducing the initial amplification angle of the SC-DARFB.
Key words: frictional energy dissipation; displacement amplification; restoring force；seismic design of bridges; double column pier
王德斌1，何杰1，孙治国2，王东升3. 具有位移放大功能的摩擦自复位支撑及其在双柱式桥墩中的应用[J]. 振动与冲击, 2023, 42(2): 51-59.
WANG Debin1，HE Jie1，SUN Zhiguo2，WANG Dongsheng3. New type of friction self-centering brace with displacement amplification function and its application in double column piers. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(2): 51-59.
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