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

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (2) : 51-59.

论文

王德斌1，何杰1，孙治国2，王东升3

作者信息 +

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

Author information +

文章历史 +

摘要

针对传统自复位支撑在低强度地震作用下难以充分耗能的问题，基于桥式放大工作机理提出了一种具有位移放大功能的扭转摩擦自复位支撑（SC-DARFB）。介绍了其基本构造、工作原理，给出了其理论恢复力模型，通过数值模拟研究了不同初始放大角度下支撑的力学性能，并对附加SC-DARFB的双柱式桥墩结构进行地震响应分析。结果表明：理论恢复力模型能够有效描述SC-DARFB的滞回性能，与数值模拟结果吻合较好；随着初始放大角度的减小，SC-DARFB起滑荷载、最大荷载和耗能能力均有显著提高，且具有较强的自复位能力；合理的设计能够确保支撑的拉、压最大荷载比满足美国钢结构规范限值1.3，基于此原因建议SC-DARFB采用倒V型对称布置形式；将SC-DARFB应用于双柱式桥墩结构，能够有效减小双柱式桥墩结构的最大墩顶位移及震后桥墩残余位移角，通过减小SC-DARFB初始放大角度能够进一步提高双柱式桥墩的减震耗能能力。

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

导出引用

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[J]. Journal of Vibration and Shock, 2023, 42(2): 51-59

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