鋼筋混凝土高層住宅鋼造雙K型斜撐框架補強試驗

Seismic Test of a Full-Scale Steel Double K-Braced Frame for Retrofit of RC Buildings

粘評(Ping Nian)

指導教授 ： 周中哲

國立臺灣大學/工學院/土木工程學研究所/碩士(2019年)

https://doi.org/10.6342/NTU201902519

摘要

本試驗為測試浮洲合宜宅地上結構之雙K型斜撐鋼框架的剪力補強效益，共計進行一組鋼框，補強方式依設計單位(永峻工程顧問股份有限公司、信業工程顧問有限公司及台聯工程顧問股份有限公司)提供，試體由承攬商(日勝生活科技股份有限公司、泰誠營造股份有限公司及富嘉樂工程有限公司)製造，試體製造及實驗在國家地震工程研究中心進行。研究動機是希望透過試驗觀察，瞭解雙K型斜撐鋼框架之受力反應，並建立單支斜撐的ABAQUS有限元素分析模型，研究不同板厚及加勁板數量下斜撐之力學行為，目的是希望建立不同斜撐的軸力軸位移曲線，及其對應雙K型斜撐鋼框架之側向載重位移曲線，以作為後續試驗與分析參考。
本研究之試體選擇浮洲合宜宅A2區C棟建築物4樓的雙K型斜撐鋼框架進行實驗，試體由雙K型斜撐鋼框架(K-Braced Frame , KBF)、深梁(Deep Beam , DB)、短柱(Short Column , SC)及牆段(Squat Wall , SW)所組成，雙 K型斜撐鋼框架由4支平板型斜撐、鋼框和加勁板所組成。試驗之鋼框及斜撐斷面分別為PL38x350及PL32x350鋼板，鋼板材質均為ASTM A572 Gr.50，鋼材降伏強度由材料試驗所得為378 MPa。試體使用8支100噸油壓千斤頂連接傳力鋼梁，並進行反覆加載試驗。由試驗結果顯示千斤頂最大力量(7186 kN ~7498 kN)發生在側位移角±2%，且斜撐之側力貢獻約為千斤頂力之80~85%。補強試體最大側位移角為3%，千斤頂力約為最大側力的80%，滿足美國混凝土試驗規範ACI 374.2R-13 (2013)的2.2%韌性要求。由於鋼框與RC界面僅有細微裂縫產生，因此本試驗之鋼框與RC間銲道接合方式能使千斤頂力有效傳遞至KBF。

關鍵字

既存結構物 ； 雙K型斜撐鋼框架剪力補強 ； 反覆載重試驗

並列摘要

The objective of this work is to evaluate the seismic performance of retrofitted structural members of high-rise buildings in Banqiao, New Taipei City. This work presents test results of “Steel Double K-Braced Frame” conducted at the National Center for Research on Earthquake Engineering (NCREE) from 2016~2017. In general, test results showed acceptable seismic performance of retrofitted structural members based on the design requirement and ACI 374.2R (2013).
The performances of KBF is presented in this study, focusing on the investigations of the overall structure and local members. For this purpose, in the beginning this study discusses the setup and the key experimental results of the specimen, such as the peak inter-story drifts and buckling of braces. Test results show that the brace members take about 80~85% actuator force at inter-story drifts under 0.02 radians,but gradually decrease to 67% actuator force when brace compression force decrease to 0.1Pcr(3% drift ratio). ABAQUS was used to simulate the responses of the single brace. The analytical results confirm that the magnitude of the severe out-of-plane buckling of the braces and buckling force can be accurately simulated. American Institute of Steel Construction (AISC Specification 360-16 (2016)) is conservative in predicting the buckling force of braces,but Wolchuk (1963) can give good accuracy result.

並列關鍵字

Existing RC Frame ； KBF ； Buckling of Braces ； Retrofitting Braces with Framework ； Full-Scale Test

參考文獻

ABAQUS (2006), “ABAQUS Analysis User’s Manual”, ABAQUS Inc., Version 6.6.

ACI Committee 318, (2014), “Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary (ACI 318R-14),” American Concrete Institute, Farmington Hills, Mich., 520 pp.

ACI 374.2R-13 (2013), “Guide for Testing Reinforced Concrete Structural Elements under Slowly Applied Simulated Seismic Loads,” American Concrete Institute,USA.

AISC 360-16 (2016), “Specification for Structural Steel Building,” American Institute of Steel Construction (AISC), Chicago, Illinois.

AISC 341-16 (2016), “Seismic Provisions for Structural Steel Buildings,” American Institute of Steel Construction (AISC), Chicago, Illinois.