| 研究生: |
紀惟 Chi, Wei |
|---|---|
| 論文名稱: |
剪力板彎矩強度需求比對鋼梁柱接頭耐震性影響研究 The Influence of Moment Demand-and-Capacity Ratios of Shear Tabs on the Seismic Performance of Steel Beam-to-column Connections |
| 指導教授: |
賴啟銘
Lai, Chi-Ming |
| 共同指導教授: |
張惠雲
Chang, Heui-Yung |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 土木工程學系 Department of Civil Engineering |
| 論文出版年: | 2016 |
| 畢業學年度: | 104 |
| 語文別: | 中文 |
| 論文頁數: | 98 |
| 中文關鍵詞: | 鋼梁柱接頭 、剪力板 、彎矩強度 、塑性轉角 |
| 外文關鍵詞: | steel beam-to-column connection, shear tab, moment strength, plastic rotation |
| 相關次數: | 點閱:100 下載:4 |
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本研究分析國內過去進行的28組傳統式鋼梁柱接頭耐震試驗,探討剪力板彎矩強度與需求對接頭耐震性所可能造成之影響。本研究分析之15組箱型柱接頭應變硬化因子 (eMu/Mp) 平均值為1.38,而13組H形柱的平均值為1.23,且僅少數接頭塑性變形未達過去設計要求1.5%弧度。進一步分析後發現,在剪力板彎矩強度足夠及未發生挫屈降伏的條件下,剪力板彎矩傳遞倍率 (eMwu/*Msp) 提高,應變硬化因子隨之提升,也提高了接頭韌性以及最大塑性轉角。但國內現行鋼結構設計假設彎矩全部由梁翼板傳遞,梁腹板與剪力板僅需傳遞剪力,而這樣設計的結果鋼梁柱接頭剪力板與梁腹板的彎矩理論強度比 (*Msp/*Mwp) 約0.8。另外,國內過去接頭試驗梁深以 600 mm為主,但實際鋼結構建築物所用的梁深以600到1000 mm居多,故梁腹抗彎矩能力與剪力板彎矩傳遞倍率對實際鋼梁柱接頭耐震行為可能影響更鉅。本研究因此建議,國內未來針對高樓層建築物所用的梁深超過900 mm之鋼梁柱接頭進行耐震試驗與設計研究,以掌握梁腹抗彎矩能力與剪力板彎矩傳遞倍率對實際鋼梁柱接頭耐震行為之影響。
This study investigates the effects of moment demand-and-capacity ratios of shear tabs on the seismic performance of conventional steel beam-to-column connections. The analyzed 15 connections have box columns and the connection-to-beam moment strength ratio (eMu/Mp) is 1.38 on average. The other 13 connections have H-shape columns and the strength ratio is 1.23. All the connections develop moment strength greater than the beam plastic moment strength, and few have plastic rotation capacity less than 1.5% radians. It was found that if shear tabs had enough moment strength and remained in elasticity, the connection-to-beam moment strength ratios would increase, and that would cause the accumulative and max plastic rotations to increase also. The moment capacity of beam webs and shear tabs are usually ignored in the seismic design of steel structures in Taiwan. Most of the tested connections have a beam depth of 600 mm. In practice, the beam depth ranges from 600 mm to 1000 mm. The moment strength of shear tabs is therefore expected to affect more. It is recommended to further perform connection testing with a beam depth over 900 mm, and to analyze the effects of moment strength of shear tabs on the seismic performance of steel beam-to-column connections.
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