Rotational inertia damper, a novel damper, possessing the advantage of displacement amplification, has been employed in outrigger system for seismic mitigation. The equivalent analysis model composed by a uniform cantilever beam and an equivalent spring was proposed to simulate the rotational inertia damper outrigger system, by which the corresponding dynamic characteristic equation was derived based on numerical assembly technique. To gain the response of the damped system, finite element method and state space method have been utilized. Finally, the results show that the pseudo-undamped natural frequency ratios and system modal damping ratios are significantly influenced by stiffness parameter of the exterior column, while the mass parameter of the rotational inertia damper has little effect on them. The optimal damping ratio can be acquired for one mode, but it may be worse for the other mode in the same position equipping rotational inertia damper. Furthermore, numerical simulation results for the typical earthquake records have verified that the rotational inertia damper outrigger has excellent control performance in displacement as well as acceleration. A good agreement between damping force and equivalent force also suggests that the damping force of rotational inertia damper is predominant and the inertial force has no significant effect on the structure.

Liangkun Liu

Ping Tan

Haitao Ma

Weiming Yan

Fulin Zhou

Advances in Structural Engineering

ADVANCES IN STRUCTURAL ENGINEERING创刊于1997年，已成为结构工程领域主要的同行评审期刊之一。为了更好地履行期刊的使命，我们最近决定为期刊推出两项新功能：(A) 邀请评论论文，对当前重要的主题进行深入阐述； (B) 报告结构工程中真正新技术的短篇论文。

Advances in Structural Engineering, established in 1997, has become one of the leading peer-reviewed journals in the field of structural engineering. To better fulfill the journal's mission, we have recently decided to introduce two new features: (A) invited review papers that provide in-depth discussions on current important topics; (B) short papers reporting truly new technologies in structural engineering.

《Advances in Structural Engineering》创刊于1997年，已成为结构工程领域主要的同行评审期刊之一。为了更好地履行期刊的使命，我们最近决定为期刊推出两项新功能：(A) 邀请评论论文，深入探讨当前重要主题；(B) 报告结构工程中真正新技术的短篇论文。

Category	Quartile
工程技术	4
工程技术, 结构与建筑技术	4
工程技术, 工程土木	4

A novel energy dissipation outrigger system with rotational inertia damper

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Category	Quartile
ENGINEERING, CIVIL	2