有邊界構材之鋼板混凝土複合牆之剪力行為分析研究

Analytical Study of In-Plane Shear Behavior of Steel-Plate Composite Wall with Boundary Elements

張明康(Ming-Kang Chang)

指導教授 ： 黃尹男

國立臺灣大學/工學院/土木工程學研究所/碩士(2017年)

https://doi.org/10.6342/NTU201703525

摘要

目前美國所使用之設計規範AISC N690s1-15(2015)提供鋼板混凝土複合牆平面內剪力強度之預測方法，Booth et al. (2015)以設計規範AISC N690s1-15(2015)之預測方法為基礎提出另一平面內剪力強度之預測方法，改善設計規範AISC N690s1-15(2015)對於鋼板混凝土複合牆在有邊界構材時低估之情形。然而，不論是設計規範AISC N690s1-15(2015)或是Booth et al. (2015)對於有邊界構材之鋼板混凝土複合牆改善之預測方法，兩者皆僅使用水平向斷面尺寸與材料參數，並未考慮牆體高寬比之影響，如以上述預測方法進行評估，在相同水平向斷面尺寸但高度不同之情況下，剪力強度的預測值皆會相等，此現象並不符合試驗之觀察結果。本研究以此為出發點，考慮高寬比之影響，對於評估有邊界構材之鋼板混凝土複合牆之剪力強度，提出一較具物理意義之預測方法。
為對鋼板混凝土複合牆之行為能有更多瞭解，本研究依據有限元素分析軟體LS-DYNA之分析結果，假設有邊界構材之鋼板混凝土複合牆之剪力強度可由鋼面板與混凝土壓桿所貢獻之剪力強度直接相加而得，以此推導出一預測模型。再藉由斷面分析軟體XTRACT，以較方便求得之壓力區深度取代壓桿深度代入預測模型。最後，觀察XTRACT之分析結果，對預測模型作進一步簡化。
將本研究所建議簡化後之預測模型和現有之預測方法進行比較，發現其準確性較現有之預測方法高，以此推論，對於評估有邊界構材之鋼板混凝土複合牆之剪力強度，本研究所建議簡化後之預測模型為一種較具準確性、方便性與物理意義之預測方法。

關鍵字

鋼板混凝土複合牆 ； 邊界構材 ； 剪力強度 ； 有限元素分析 ； LS-DYNA

並列摘要

Currently, AISC N690s1-15 (2015) provides the method for predicting the in-plane shear strength of steel-plate composite wall (SC wall). On the other hand, Booth et al. (2015) also provides another prediction method based on AISC N690s1-15 (2015) to improve the underestimate for predicting the in-plane shear strength of SC wall with boundary elements. Nevertheless, whether AISC N690s1-15 (2015) or Booth et al. (2015), they both simply take the dimension of horizontal cross section and the parameters of materials into consideration, neglecting the effect of aspect ratio. It means that SC walls with the same dimension of horizontal cross section but different height have the same in-plane shear strength. The prediction is different from the experimental result. This research uses above result as a starting point, taking the effect of aspect ratio, providing a method with physical meaning for predicting the in-plane shear strength of SC wall with boundary elements.
To make a further understanding of the behavior of SC wall, this research uses the finite element method software LS-DYNA as the analytical tool, developing a prediction model. The shear strength of SC wall can be calculated directly by the contribution of faceplate and concrete strut respectively. Furthermore, prediction model uses the depth of compression zone which is more convenient to get by cross-sectional analytical software XTRACT to replace the depth of concrete strut. Finally, this research simplifies the prediction model by observing the analytical result by XTRACT.
Comparing the simplified method suggested by this research with other prediction methods, simplified method is more accurate than other prediction methods. For evaluating the in-plane shear strength of SC wall with boundary elements, simplified method is a more accurate, convenient, and physically prediction method.

並列關鍵字

steel-plate composite wall ； boundary element ； shear strength ； finite element method analysis ； LS-DYNA

參考文獻

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