第三十五卷第一期(期別135)(109年)
| 標題 | 鋼筋混凝土構架填充高台度磚牆之反覆載重試驗 |
|---|---|
| 作者 | 張順益、蘇柏翰、巫垂晃、婁光銘 |
| 關鍵字 | 鋼筋混凝土、反覆載重試驗、側推分析、台度磚牆剪力強度 |
| 摘要 | 台灣地區在夏天因氣溫高及濕度大，因而建築物的通風及採光就顯得非常重要，而為了能有較大的通風及採光面積，經常在窗台上方及兩邊柱間設置窗戶，因而出現了國內特有的台度磚牆，尤其是為了滿足儲藏室及廁所的隱密性更出現了高台度磚牆。國內對於台度磚牆的試驗研究相當稀少，應與缺乏大型實驗設備有關，近年台北科技大學已陸續進行相關的試驗研究，先後探討台度磚牆發生短柱破壞的臨界條件以及低台度磚牆剪力強度的反覆載重試驗研究，本文則進一步設計及製作兩座實尺寸鋼筋混凝土構架填充高台度磚牆試體進行反覆載重實驗研究，其填充台度磚牆高度分別為190公分與230公分。利用此兩座試體以及先前空構架試體的試驗結果來推估高台度磚牆的剪力強度計算公式。為了能可靠的預測高台度磚牆的剪力強度，計算公式除了考慮台度磚牆之高寬比對於剪力強度的影響之外，也納入紅磚劈裂強度對高台度磚牆剪力強度的貢獻。 |
| Title | Experimental study of reinforced concrete frame filled with high masonry window spandrel |
|---|---|
| Author | Shuenn-Yih Chang, Bo-Han Su, Tsui-Huang Wu, Kuang-Ming Lou |
| Keywords | reinforced concrete building, highmasonry window spandrel, seismic evaluation, pushover analysis |
| Abstract | Taiwan areais characterized by high temperature and high humidity in summer. Hence, light and air are important in designing a building. To permit light and air to enter, windows are designed as large as possible. As a result, a window is located below the RC concrete beam, above the masonry window spandrel and between the two adjacent RC columns. This type of window is very unique in Taiwan area. Furthermore, to meet the requirement of concealment for storage room or restroom, high masonry window spandrels appear. Experimental studies of this type of masonry window spandrels are very rare. This might be due to the lack of large laboratories for conducting prototype tests. In the recent, a series of experimental studies on this type of window spandrels have been conducted by National Taipei University of Technology. In fact, the critical condition to experience a short-column failure has been identified and the cyclic-loading test results for the reinforced concrete frame filled with low masonry window spandrelshas been completed and published. In this work, two reinforced concrete frames filled with low masonry window spandrels were designed and fabricated. A cyclically loading test was performed for each test specimen. A formula for estimating the shear strength of a masonry window spandrel was proposed. |
| 標題 | 包覆填充型箱型柱接力式繫筋對混凝土圍束的有效性 |
|---|---|
| 作者 | 陳正誠 、吳品達、許瑜麟 |
| 關鍵字 | 包覆填充型箱型柱、鋼骨鋼筋混凝土柱、填充型箱型柱、包覆型SRC柱、接力式繫筋 |
| 摘要 | 包覆填充型箱型柱的橫向鋼筋，除了外圍之圍束箍筋外通常也需要配置繫筋以滿足規範之要求。但是傳統繫筋受到鋼骨箱型柱的阻撓而無法直通，因此箱型柱外側混凝土的圍束往往無法滿足規範的要求，使用「接力式繫筋」為可能解決這個問題的方法。接力式繫筋傳遞圍束力的路徑為「第1支短繫筋-橫向箱型柱柱板-縱向箱型柱柱板-另一橫向箱型柱柱板-第2 支短繫筋」。本文完成6組大尺寸（斷面尺寸550×550以上）包覆填充型箱型柱試體之反復側向載重試驗，探討接力式繫筋之有效性。試驗試體之寬厚比在27~37之間，因此下述結論適合使用於柱板寬厚比不大於37 之情況。試驗結果發現：（1）接力式繫筋可以取代直通式繫筋；（2）接力式繫筋可以有效圍束箱型柱外側之混凝土；（3）接力式繫筋對橫向鋼筋量之貢獻可以採用短繫筋之斷面積計算之。 |
| Title | The Effectiveness of Combined Ties on the Confinement of Encased Concrete-Filled Box Columns |
|---|---|
| Author | Cheng-Cheng Chen, Pin-Da Wu, Yu-Lin Hsu |
| Keywords | Encased Concrete-Filled Box Columns, steel reinforced concrete column, concrete filled box column, SRC column, encased box column, combined tie |
| Abstract | In an encased concrete-filled box column, the concrete inside the steel box column is confined by the box column. However, the confinement of the concrete outside the box column (referred as outer concrete hereafter) need to be provided by the steel cage which is composed of main reinforcement and transverse reinforcement. Due to the existence of the steel box column, the traditional ties used in RC columns can not be implemented here. The use of so called combined tie was introduce to solve this problem. The confinement force was transferred from the first short tie bar to the box column and then to the second short tie bar located at the opposite side of the box column. In this article, six large scale (column size larger than 550×550) was tested under cyclic lateral loading to investigate the effectiveness of using the combined tie.The range of the width-to-thickness ratio of steel plate investigated was between 27 and 37, therefore the test result was applicable to column with width-to-thickness ratio less than 37. Some conclusion can be drawn based on the test results: (1) the combined tie can substitute the use of conventional tie bar, (2) the combined tie is effective in confining the outer concrete, and (3) the confinement effect contributed by combined tie can be determined using the cross section of the short tie bar. |
| 標題 | 玻璃纖維包覆金屬螺紋管圍束混凝土之軸壓試驗與力學模型 |
|---|---|
| 作者 | 李中生、周中哲、譚皓翔、陳威霖 |
| 關鍵字 | 螺紋鋼管、玻璃纖維、圍束混凝土、軸壓試驗 |
| 摘要 | 本文探討新發展之玻璃纖維包覆金屬螺紋鋼管圍束混凝土軸壓試驗結果與力學模型，此複合式圍束管的組成是以螺紋鋼管做為模具，於螺紋管外的凹槽中纏繞玻璃纖維紗束，形成環肋式加勁，再以預浸玻璃纖維布包覆加勁金屬螺紋管。本研究共進行36組圍束混凝土軸壓試驗，其中包含不同之圍束與斷面形式，目的為探討在不同圍束條件下之混凝土行為，以及混凝土圓柱中空斷面對於圍束效果的影響。本研究將中空斷面以面積比形式分成圍束與未圍束區域，利用試驗結果回歸出面積比與軸應變的關係式，利用所提出的面積比公式，可預測圍束中空混凝土圓柱的軸壓行為。 |
| Title | Axial Behavior and Test of Concrete-Filled Spiral Corrugated Steel Tubes Wrapped with Glass Fiber Reinforced Polymer |
|---|---|
| Author | Chung-Sheng Lee, Chung-Che Chou, Hao-Hsiang Tan, V-Liam Chin |
| Keywords | Steel Corrugated Tube, Glass Fiber Reinforced Polymer (GFRP), Confined Concrete, Axial Compression |
| Abstract | This paper presents the axial behavior of concrete cylinders confined by a novel composite tube. This composite tube consists of a spiral corrugated steel tube and Glass Fiber Reinforced Polymer (GFRP) shell. The spiral corrugated steel tube serves as a mold for wrapping GFRP shell. The concave area of spiral corrugated tube are filled with pre-preg fiber strands and epoxy resins to form an enhanced flat tube, and a multilayer GFRP jacket are wrapped around the enhanced steel tube. Thirty-six cylinder specimens were designed and tested under uniaxial compression. The test parameters included different types of confinement tube and cross section. This paper proposes an analytical method to predict the axial behavior of concrete filled GFRP-wrapped spiral corrugated tube, and a calculation method for the ratio of effective confined area to predict the axial behavior of hollow section specimens. |
| 標題 | 利用虛擬側力與破壞機制探討挫屈束制支撐面外穩定性及案例評估分析 |
|---|---|
| 作者 | 歐易佳、陳力維、蔡青宜、吳安傑、蔡克銓 |
| 關鍵字 | 挫屈束制支撐、撓曲效應、面外穩定性、虛擬側向力、破壞機制、二次效應 |
| 摘要 | 當BRB或端部接合發生面外不穩定時，其軸向勁度與強度將大幅降低，喪失消散能量之功能。本研究提出一套穩定性評估模型，考慮圍束單元撓曲效應及接合板旋轉效應，並利用虛擬側向力及破壞機制探討BRB及接合之面外穩定性。為驗證所提方法之有效性，本研究設計六組不同長度、外管尺寸及接合板勁度之實尺寸WES-BRB進行於不同初始缺陷及端部面外位移下之反覆載重試驗。試驗結果顯示，分析模型可確實反應初始缺陷、端部面外位移及接合板勁度效應對BRB整體穩定性之影響。本文另利用該評估模型對業界常用之BRB設計強度、構架尺寸與配置型式，以國震中心BOD雲端設計軟體規劃的581組BRB設計例進行挫屈強度分析。分析結果顯示，當BRB端部面外位移角由1%增至2%時，挫屈強度減損幅度約介於12%至15%，對整體穩定性影響非常顯著；若接合板緣無加勁，其挫屈強度較有加勁時減少約5%至20%，顯見工程應用時接合板加勁之重要性。案例分析亦顯示，外鋼管設計之需求容量比若控制在0.9以下，可使其面外穩定性更有保障。 |
| Title | Buckling-Restrained Brace Out-of-Plane StabilityAssessment Using Notional Load and Failure Mechanism Analysis with Multi-Case Study |
|---|---|
| Author | I-Chia Ou, Li-Wei Chen, Ching-Yu Tsai, An-Chien Wu, Keh-Chyuan Tsai |
| Keywords | buckling-restrained brace, flexural effect, out-of-plane stability, notional load, failure mechanism, second-order effects |
| Abstract | When the out-of-plane (OOP) instability of the BRB and the end gusset connections occurs, the energy dissipation capability of the BRB will be significantly reduced. This study develops a simplified analytical model using the concept of the notional load and considering the flexural restrainer to assess the BRB global stability. Cyclic loading tests on six full-scale BRBs with different lengths, steel casing sizes, and gusset connection stiffness were conducted under various initial imperfections and OOP drifts to demonstrate the effectiveness of the proposed method. Test results indicate that the effects of the initial imperfection, OOP drift, and gusset edge stiffener on the BRB stability are reasonably captured. Moreover, parametric analyses were conducted using the proposed method on 581 BRB and connection cases, detail designed by the Brace-on-Demand cloud service, with varying frame span-to-height ratios and brace yield strengths. Analytical results suggest that the stability limit strength is reduced by 12% to 15% with the OOP drift ratio increased from 1% to 2%,while it is reduced by 5% to 20% without the presence of gusset edge stiffeners.It is concluded that the global stability is vulnerable to the OOP drift and adequately stiffening the gusset is recommended in BRB practices. It also shows that as long as the demand-to-capacity ratio (DCR) is less than 0.9 for steel casing stability calculated by using the practical evaluation method, the overall stability can be effectively conserved. |