懸臂式擋土牆設計：112 年版規範下要檢核哪些項目

1設計依據

現行設計依民國 112 年版《建築物基礎構造設計規範》與《建築物混凝土結構設計規範》[5, 6]。外部穩定以安全係數檢核，牆身與底版等構材以強度設計。

2外部穩定：常時與地震

外部穩定要分別在常時與地震兩種情況下檢核：

• 傾覆：抵抗彎矩與傾覆彎矩的比值
• 滑動：底版摩擦與附著力，必要時計入牆前被動土壓與止滑榫
• 偏心：合力作用點是否落在底版容許範圍內
• 承載：基底最大壓力是否小於地層容許承載力

3土壓與水

常時主動土壓之外，地震時要計入地震土壓，常用 Mononobe–Okabe 理論 [7]。牆背與牆前有地下水時，還要考慮水壓、底版上浮力與地震時的動水壓。

4構材設計

牆身、前趾、後踵與止滑榫都要檢核撓曲與剪力強度，並配置溫度筋、確認伸展長度。牆身彎矩沿高度遞減，主筋常在適當高度截斷以節省材料。

5在 StructFlow 中完成

StructFlow 的懸臂式擋土牆工具涵蓋上述全部項目，並自動挑選全部通過且最省的配筋，產出可列印的計算書。

參考文獻

1. Mander, J. B., Priestley, M. J. N., & Park, R. (1988). Theoretical stress-strain model for confined concrete. Journal of Structural Engineering, 114(8), 1804–1826. doi:10.1061/(ASCE)0733-9445(1988)114:8(1804)
2. Popovics, S. (1973). A numerical approach to the complete stress-strain curve of concrete. Cement and Concrete Research, 3(5), 583–599. doi:10.1016/0008-8846(73)90096-3
3. Whitney, C. S. (1937). Design of reinforced concrete members under flexure or combined flexure and direct compression. ACI Journal Proceedings, 33(3), 483–498. doi:10.14359/8429
4. ACI Committee 318. (2019). Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19). American Concrete Institute. doi:10.14359/51716937
5. 內政部（Ministry of the Interior, Taiwan）. (2023). 建築物混凝土結構設計規範（Design Specifications for Concrete Structures of Buildings），112 年 8 月 10 日修正發布，113 年 1 月 1 日生效. nlma.gov.tw
6. 內政部（Ministry of the Interior, Taiwan）. (2023). 建築物基礎構造設計規範（Design Specifications for Foundations of Buildings），112 年 6 月 20 日修正發布，113 年 1 月 1 日生效. nlma.gov.tw
7. Mononobe, N., & Matsuo, H. (1929). On the determination of earth pressure during earthquakes. Proceedings of the World Engineering Congress, Vol. 9, Tokyo, 177–185.
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9. National Center for Research on Earthquake Engineering (NCREE). 台灣新型高強度鋼筋混凝土（Taiwan New RC）專區. ncree.niar.org.tw/service/newrc
10. Chiu, C.-K., Hung, C.-C., Lin, K.-C., Liu, K.-Y., Lee, H.-J., Cheng, M.-Y., et al. (2019). Design Guideline for Building of High-Strength Reinforced Concrete Structures (Draft), NCREE-19-001. National Center for Research on Earthquake Engineering.
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13. Shao, Y., Kuo, C.-W., & Hung, C.-C. (2021). Seismic performance of full-scale UHPC-jacket-strengthened RC columns under high axial loads. Engineering Structures, 243, 112657. doi:10.1016/j.engstruct.2021.112657
14. Hung, C.-C., Kuo, C.-W., & Shao, Y. (2021). Cast-in-place and prefabricated UHPC jackets for retrofitting shear-deficient RC columns with different axial load levels. Journal of Building Engineering, 44, 103305. doi:10.1016/j.jobe.2021.103305
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16. Shen, W.-C., & Hwang, S.-J. (2023). Confinement reinforcement of high-strength reinforced concrete tied columns under high axial load. ACI Structural Journal, 120(3), 145–155. doi:10.14359/51738505

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