含挫屈束制支撐外伸臂系統耐震性能分析與設計

Seismic performance and design of high-rise building incorporating buckling-restrained brace outrigger system

10.6849/SE.202306_38(2).0005

蔡守榕(Shou-June Tsai)；林保均(Pao-Chun Lin)

高樓層結構 ； 外伸臂桁架系統 ； 挫屈束制支撐 ； 非線性反應譜分析 ； 非線性動力歷時分析

結構工程

38卷2期（2023 / 06 / 01）

107 - 137

繁體中文;英文

此研究主要目的為進行含阻尼器外伸臂系統結構最佳化設計與探討高樓層建築之耐震性能，重點為利用外伸臂桁架系統以降低結構物之受震反應。相較於傳統型外伸臂，特別對加裝阻尼器之外伸臂系統結構進行探討，藉由阻尼器以增加結構物阻尼比達到消能效果。而此研究所使用阻尼器為挫屈束制支撐（buckling-restrained brace, BRB），因BRB具有良好的軸拉與軸壓力發展強度，受壓時無須考量挫屈問題與良好的消能行為，故將其特殊的力學行為加入外伸臂桁架系統中，預期在小地震下因較大的彈性勁度以及面臨大地震時透過BRB的能量消散機制以減緩結構物受震反應。此研究利用OpenSees軟體建立二維分析模型，主要以配置兩組外伸臂系統做為探討目標，並將分析模型加以簡化，分別建立四種不同樓高之72、144、216、288m之簡化模型，為了參數研究的目的，簡化模型使用Timoshenko beamcolumn element，以便模擬出模型從低到高，由剪力到撓曲變形的行為。分析方法主要藉由非線性反應譜分析（Response spectral analysis, RSA）進行多種結構參數組合之參數分析，包含不同的外伸臂高程及BRB與外周柱的勁度比例，且參數值皆有一定的限制，以貼近實務上的設計。並以非線性歷時分析（Nonlinear response history analysis, NLRHA）驗證其受震反應結果。探討不同樓高含阻尼器外伸臂桁架系統，滿足不同最佳化目標包括最大頂層側位移角、層間側位移角、核心結構基底剪力、核心結構傾覆彎矩和BRB消能表現，最佳設計時結構參數的組合。

The keen purpose of this study is to investigate the seismic performance of buildings equipped with damped-outrigger system using the buckling-restrained brace (BRB) system (BRB-outrigger) and to propose the optimal design recommendation for buildings with a different height. The numerical models with building heights of 72, 144, 216 and 288m, each contains two layers of BRB-outrigger and a 40m by 40m structural plan are analyzed using response spectral analysis (RSA) and nonlinear response history analysis (NLRHA) procedures. To get more closer to the actual reality, the member-by-member benchmark models are designed based on the seismic code requirement. In the response spectral analysis procedure, the equivalent damping ratio is computed in order to include the BRB's inelastic response. For the main purpose of parametric study, a simplified model which will be using a Timoshenko beamcolumn element in order to capture shear-type to flexural-type lateral deformation for a lower to higher raising buildings are proposed. The dimensionless parameters that actually describe the relationships between the core structure stiffness, outrigger flexural stiffness, the axial stiffness of BRB and perimeter column in the parameter study are considered based on practical design and allowable structural sections. The optimization targets include the maximum roof drift, inter-story drift ratio, core structure base shear, core structure overturning moment and the BRB energy dissipation performance. Based on the analyzed result, the ranges of optimal design parameters vary in the different optimization targets and building heights. This study concludes with a design recommendation for building equipped with BRB-outrigger system with different building heights.

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