- 學位論文
鋼板混凝土複合牆耐震行為數值模擬與剪力強度預估研究
Analytical Studies on Seismic Behavior and Shear Strength of Steel-Plate Composite Walls
摘要
鋼板混凝土複合牆是由兩面鋼面板(Surface Steel Plate或稱Faceplate)與澆置於兩片鋼面板之間的內填混凝土(Infilled Concrete)，以及焊接於鋼板內側之剪力釘(Shear Stud)、橫向螺桿(Tie Rod)與隔板(Partitioning Web)等剪力連接器所共同形成之結構牆，且具有高強度、高勁度之特性。鋼板混凝土複合牆早期主要應用於核能設施結構，近幾年開始被應用於超高樓核心筒系統，當此類牆體應用於超高樓層的建築物中，會承受極大的軸力，而現今設計規範AISC N690s1-15 (2015)以及AISC 341-16 (2016)是基於牆體受純剪作用下的行為所推導而得，並未考慮軸力對牆體剪力強度之影響。 目前針對含邊界構材之鋼板混凝土複合牆平面內剪力強度預測模型發展尚未完善，且不同文獻研究對於軸力參數影響牆體剪力強度發展的看法不一，因此本研究將針對「高寬比」以及「軸壓比」對牆體剪力強度之影響，利用六座剪力破壞主控之鋼板混凝土複合牆試驗結果與有限元素分析結果進行觀察、比較及參數分析，最終發展一套能夠有效掌握高寬比、軸壓比、鋼材比與混凝土抗壓強度參數之剪力強度預測模型。 本研究透過參數分析觀察出牆體中鋼面板剪力強度發展僅和鋼材比呈正相關，且可忽略其他參數之影響；在內填混凝土的部分，剪力強度發展則採用迴歸分析的方式進行簡化，並將本研究建議之預測模型與現有之預測模型進行比較，驗證結果顯示本研究建議之預測模型可合理保守估計且能夠有效掌握各參數之影響。此外，本研究亦利用影像量測分析系統針對牆體表面應變場進行探討，並比較分析結果和三軸應變計讀數之差異，以驗證影像分析結果之可靠性。
並列摘要
Steel-Plate Composite Wall (SC Wall) is a structural wall composed of two sheets of steel faceplates, infilled concrete and shear connectors such as shear stud, tie rod and partitioning web welded on the inner side of steel faceplates. It has the characteristics of high strength and high stiffness. SC wall was mainly used in safety-related nuclear facilities at first. In recent years, it has been applied to the core of super-high-rise buildings, which is subjected to significant axial force. The design equations for SC wall in current design specifications, namely, AISC n690s1-15 and AISC 341-16 were developed based on the behavior of SC wall subjected to pure in-plane shear and without axial force. Impact of axial force on the in-plane shear strength of SC wall with boundary members requires more research. This study focuses on the influence of "aspect ratio" and "axial-force ratio" on shear strength of SC wall. Firstly, finite element models were validated using experimental results of 6 SC-wall specimens with two different aspect ratios and three axial-force ratios. Secondly, a set of parametric study were conducted using the validated modeling techniques. Finally, a shear-strength prediction model was proposed to explicitly include the influence of aspect ratio, axial-force ratio, reinforcement ratio and concrete compressive strength on shear strength of SC wall. Through parameter analysis, it was found that the shear strength of steel plates in the SC wall was only positively correlated with the reinforcement ratio, and the influence of other parameters can be ignored. In the part of infilled concrete, the shear strength development was simplified by regression analysis. The verification results showed that the prediction model proposed in this study was more accurate than any other prediction models from selected literatures. In addition, image-based measurement method was applied to the test data of the 6 SC-wall specimens to compute the strain field in the steel surface plates under displacement-controlled cyclic loading. The results were compared with those obtained from strain-gauge data to verify the reliability of image-based measurement results.
參考文獻
延伸閱讀
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