新建含挫屈束制支撐之實尺寸兩層樓鋼筋混凝土構架耐震設計、試驗與分析研究：一、試體設計與耐震測試

Seismic Design, Tests and Analysis of a Full-scale Two-story Reinforced Concrete Frame with Buckling-restrained Braces - Part I: Specimen Design and Seismic Tests

楊巽閎(Hsun-Horng Yang) ； 黃潔倫(Jie-Luen Huang) ； 吳安傑(An-Chien Wu) ； 李昭賢(Chao-Hsien Li) ； 蔡青宜(Ching-Yi Tsai) ； 王孔君(Kung-Juin Wang) ； 蔡克銓(Keh-Chyuan Tsai)

《結構工程》 31卷2期 (2016/06) Pp. 91-114

https://doi.org/10.6849/SE.201606_31(2).0005

摘要

挫屈束制支撐（buckling-restrained brace, BRB）能提升構架的勁度、強度與韌性，且以不發生挫屈為特點，已廣泛運用在鋼結構建築中。BRB雖已應用在一些鋼筋混凝土（reinforced concrete, RC）構架補強中，但應用在新建RC 構架中卻不常見，主要因為鋼與RC 構件之連接介面設計與施工較困難與複雜。本研究提出以預埋工字型鐵件作為RC 構件與BRB連接介面之耐震設計與分析方法，藉由鐵件傳遞BRB 至RC 梁柱構件表面之正向力與剪力，確保BRB及RC構架均能發揮原設計性能。本研究以一座雙層實尺寸總高7.41m、寬5m含BRB之RC構架（BRB-RCF）試驗與分析，分為兩篇探討預埋鐵件之設計和施工方法、構架整體耐震性能及接合板與RC梁柱構件之受力行為。構架試體採用A36鋼材BRB與之字形配置，接合板設計考慮BRB軸力與梁柱開合效應，梁柱構件設計滿足ACI 318-14耐震設計規範，並於國家地震工程研究中心進行四次擬動態與反覆載重試驗至試體破壞為止。本研究亦對雙層BRB-RCF試體建立PISA3D模型分析，挑選擬動態試驗之地震歷時並預測試驗反應。分析預測與試驗比對結果顯示，BRB-RCF於小震時之反應可以PISA3D預測模型合理預測。試驗結束後，本研究進一步利用試驗反應校正PISA3D分析模型，以達到更準確之模擬結果；試驗所得及模擬結果在下篇中做更詳細說明。

關鍵字

鋼筋混凝土結構 ； 挫屈束制支撐 ； 預埋鐵件 ； 擬動態試驗 ； 耐震設計 ； 軟化壓拉桿模型

並列摘要

Buckling-restrained braces (BRBs) have been widely used nowadays in steel structures as it can provide high stiffness, strength and ductility without compression buckling. Researches on using BRBs for seismic retrofit of existing reinforced concrete (RC) buildings have been reported. It is found the construction of BRB and RC member interfaces are often difficult, mostly due to the tensile and shear strengths of post-installed anchors in concrete are limited. As a result, the size and effectiveness of the BRBs are restricted. Nonetheless, researches on applying BRBs for new RC constructions are rather limited. This research investigates the seismic design and analysis methods of using the proposed I-shape steel embedment as the interface for the BRB and RC members. Steel embedment is designed to transfer the BRB normal and shear forces in order to secure the seismic performance of the RC buildings. In this study, a full-scale two-story RC frame with BRBs (BRB-RCF) is tested using hybrid and cyclic loading test procedures. The BRBs are arranged in zigzag configuration. The design of gussets incorporates the BRB axial and RC frame actions, while the beam and column members comply with ACI 318-14 seismic design provisions. The results are divided into two papers to discuss the design and construction methods of the steel embedment, seismic performance of the BRB-RCF, and seismic responses of the BRBs, gussets and RC members. A typical PISA3D numerical model of the BRB-RCF was constructed to predict the test responses and select the earthquake ground motions for hybrid tests. Analytical results indicate that the seismic responses of the BRB-RCF can be satisfactorily predicted only under the small earthquake. After all tests, a calibrated PISA3D numerical model is validated. It is illustrated with details in the Part II paper that the experimental responses of the BRB-RCF can be accurately simulated using the proposed procedures.

並列關鍵字

reinforced concrete frame ； buckling-restrained brace ； steel embedment ； hybrid test ； seismic design ； softened strut-and-tie model