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  • 學位論文

非韌性配筋鋼筋混凝土構架振動台實驗研究

Shaking Table Tests of RC Frames with Non-ductile Detailing of Columns and Joints

指導教授 : 黃世建
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摘要


1999年發生的921集集大地震中,許多老舊建築物於強震中倒塌了,其中更是不乏高樓層建築物,高樓層建築物的倒塌不僅造成其內部的財產損失,相較於低矮形建築物更容易造成周邊區域的傷亡。倒塌的建築物大多是因為柱之垂直承載能力喪失,檢視災損照片發現這些柱多數為非韌性配筋,即為柱箍筋彎勾非135度耐震彎勾,箍筋間距過大等圍束能力不佳的情形,如此配筋設計將導致建築物之消能與變形能力大幅降低,提高了建築物崩塌的機率。 因此,本研究為了探究老舊高樓層建築物之動態倒塌行為,遂參考80年代之醫院建築物,建構四座2.25縮尺之兩層兩跨鋼筋混凝土構架,在2009年三月於台灣國家地震工程研究中心(NCREE)執行振動台倒塌實驗,實驗採用921地震歷時作為地震力輸入。試體設計有別於以往之鋼筋混凝土倒塌實驗,關注焦點在混凝土柱之破壞行為,本實驗除了可以觀察到鋼筋混凝土構架之倒塌行為之外,亦可觀察到結構之梁,柱和梁柱接頭的互制作用等。四座試體設計變化參數分別包括柱之配筋形式、接頭圍束情形以及軸力加載大小。同時,透過實驗配置中之預軸力加載以及側向慣性力的加載,我們可以觀察到高樓層建築物一、二樓構架之動態倒塌行為,以模擬高樓層受震崩塌之行為。 本文將著重於實驗結果與數據討論,同時也將探討試體構架之整體破壞模式。在振動台測試後,未來將針對分析模型的結果與實驗數據進行比較,比較結果將可以凸顯出分析模型的受限和不足之處。本研究實驗結果將可以提供豐富的鋼筋混凝土結構物倒塌資訊,以協助修正現有分析模型,對現有的鋼筋混凝土構架的受震行為有更好的預測,並且可以提出更經濟的改進對策。

並列摘要


In 1999, many old buildings collapsed during the Chi-Chi Earthquake, among those buildings, there are so many mid to high-rise buildings. The collapse of those buildings not only caused damage to itself, but also to the surrounding area. The main reason for the building collapse is lost of vertical load resisting capacity of the vertical element, columns, so that the whole building cannot stand anymore. After inspecting those damage photos, we find out that most parts of the columns detailing were non-ductile detailing, including 90 degrees hook, large stirrup spacing, etc. Those design cause poor column confinement, decrease the building’s energy dissipation, deformation ability, and increase the collapse probability. Therefore, we are going to investigate the collapse behavior of mid, high-rise existing building, four specimens which are referring to the existing hospital building in Taiwan built in 1980s were designed and tested in lab. Those four RC specimens are 2.25 scaling down and tested by using shake table in NCREE. We chose the Chi-Chi earthquake to be the test program. Comparing with previous RC collapse tests which only concerned about RC columns’ behavior, this experiment can observe not only single elements, but also including whole frame’s behavior and elements’ interaction. There are several parameters in this research, including column detailing, beam-column joint’s confinement and also the pre-axial load level. Also, we can observe the dynamic collapse behavior of 1st and 2nd floors’ columns of building subjected to axial load and lateral inertia force.. For this thesis, it focuses on the experimental result and also discusses the whole frames’ failure type. After the shake table tests, the test result is compared with the existing analytical models. The comparison result can reveal the insufficiency of the existing analytical models. This experiment can offer abundant information of RC frames collapse behavior and help the researchers to upgrade existing analytical models to make better prediction for RC buildings’ seismic behavior, also, to raise up the more economical improvement.

參考文獻


8. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05),”American Concrete Institute, Farmington Hills, 2005.
9. Joint ACI-ASCE Committee 352, “Recommendations for Design of Beam-Column Connections in Monolithic Reinforced Concrete Structures (ACI 352R-02),” American Concrete Institute, Farmington Hills, Mich., 40 pp (2002).
1. 內政部,建築研究所,「921集集大地震建築物震害調查初步報告」,內政部建築研究所,台北,民國八十八年。
2. Elwood, K., Shake Table Tests and Analytical Studies on the Gravity Load Collapse of Reinforced Concrete Frames, PhD dissertation, Department of Civil and Environmental Engineering, University of California, Berkeley (2002).
3. Elwood, K.J., and Moehle, J.P., “Shake Table Tests and Analytical Studies on the Gravity Load Collapse of Reinforced Concrete Frames,” PEER report 2003/01. Berkeley, Calif.: Pacific Earthquake Engineering Research Center, University of California (2003).

被引用紀錄


李政達(2011)。鋼筋混凝土非線性結構動力分析之數值雜訊探討〔碩士論文,國立臺北科技大學〕。華藝線上圖書館。https://doi.org/10.6841%2fNTUT.2011.00382
洪宗盟(2011)。多自由度鋼筋混凝土結構物損傷指標的研究〔碩士論文,國立臺灣大學〕。華藝線上圖書館。https://doi.org/10.6342%2fNTU.2011.03247

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