双向地震作用下拉索支撑惯容系统及其在钢结构中的应用

Cable-bracing inerter system and its application in steel structure subjected to bi-directional ground motions

近年来,惯容系统作为一种高效被动减震系统被广泛关注,其中拉索支撑惯容系统得益于跨层便利,经济优势显著。为研究双向地震动作用下拉索支撑惯容系统的减震性能,提出了一种拉索支撑惯容系统的双向减震设计方法并给出了实用设计流程。采用杠杆机制模拟拉索支撑的转向特性,基于各元件的拓扑组合模拟惯容系统,在OpenSees中实现了拉索支撑惯容系统的有限元模型的建立。利用场地实测地震动数据对安装有跨层型拉索支撑惯容系统的一栋实际钢结构的双向减震性能进行了评估。有限元计算结果表明,所建立的拉索支撑惯容系统有限元模型可以很好地表达其位移传递效率及惯容元件特性;依据等效参数进行设计的拉索支撑惯容系统具有良好的双向减震性能及显著的阻尼增效性能,可用于实际拉索支撑惯容系统的钢结构设计。

Recently, the inerter systems have received widespread attention from scholars as an efficient passive damping system. Among the inerter systems, the cable-bracing inerter system(CBIS) benefits from cross-layer convenience and has significant economic advantages. In order to investigate the damping performance of the CBIS under the action of bi-directional ground motions, a bidirectional vibration control method for the CBIS and a practical design process were proposed. The lever mechanism was used to simulate the steering characteristics of the cable-bracing system, and the topological combination of the elements was used to simulate the inerter system. The finite element model of CBIS was implemented in OpenSees. The performance of the cross-layer installed CBIS used in a real-world steel structure was evaluated in both directions using ground motion data measured at the site. The finite element calculation results show that the developed finite element model of the CBIS can well represent the efficiency of displacement transfer and characteristics of inerter. The effective bi-directional damping performance and the significant damping efficiency of the CBIS designed based on equivalent parameters are verified, providing a basis for further practical use of the CBIS.