對傳統鋼筋混凝土橋柱來說，橫向鋼筋扮演的角色是提供剪力強度及圍束力。在橋梁耐震設計中，為了滿足強度與韌性需求，鋼筋混凝土橋柱需要大量的橫向鋼筋且規定許多配筋細節。舉例來說:一般橋柱的橫向箍筋若依現行規範設計，則箍筋間距通常約在 。然而大量的橫向鋼筋不僅僅施工不易亦增加混凝土橋柱的造價。本研究嘗試開發一個新的橋柱結構系統，利用鋼管提供混凝土良好的圍束作用及剪力強度的特性，經由試驗來探討矩形複合式橋柱之結構行為。試驗參數規劃鋼管厚度、剪力釘的影響及跨深比。研究結果顯示:(1)以R.C.剪力強度與鋼管剪力強度疊加來估計複合式橋柱剪力強度較為保守，(2)剪力釘對複合式橋柱強度與勁度沒有明顯影響，約可以增加15%的韌性，(3)複合式橋柱桿件的極限強度與剪力韌性皆比傳統R.C.柱桿件為佳。

The transverse reinforcement provides shear resistance and confinement of reinforced concrete bridge piers. However, due to the requirements of strength and ductility in seismic resistant design, large amount of transverse reinforcements are usually required for reinforced concrete bridge piers. For example, the spacing of transverse reinforcements of bridge pier in seismic active area is usually between 10 centimeters to 20 centimeters. These transverse reinforcements not only complicate the construction works but also interfere the quality of concrete casting severely. This reported research examined a newly developed system which adopts the steel tube to provide shear resistance and ductility through the excellent confinement of concrete provided by the steel tube. A series of experimental studies were carried out to examine the behavior of the proposed composite bridge piers. The effect of the thickness of steel tube, shear stud, and shear span of the member were examined. It is found that the shear strength of the proposed composite bridges pier can be calculated based on the summation of the shear strength of concrete section and the tubular steel section. The application of shear studs on the steel tubes will increase the ductility of the bridge pier about 15% as compared with those members without shear studs. The experimental studies also demonstrated that the proposed composite type bridge pier is able to provide not only better strength but also superior ductility as compared with that of conventional reinforced concrete bridge piers.

[1] 林科銘，「複合式混凝土橋柱之耐震行為」，國立台灣科技大學營建工程系，碩士論文，民國93年6月。
[2] Aboutaha, R.S.，「Seismic resistance of steel-tubed high-strength reinforced-concrete columns」，Journal of Structural Engineering, v 125, n 5, 1999, p 485-494
[3] Aboutaha, R.S，「SEISMIC RESISTANCE OF STEEL CONFINED REINFORCED CONCRETE (SCRC) COLUMNS」，Georgia Institute of Technology, School of Civil and Environmental Engineering, Atlanta, GA 30332-0355, U.S.A
[4] R. S. Aboutaha，「Seismic Retrofit of Non-Ductile Reinforced Concrete Columns Using Rectangular Steel Jackets」， Ph.D. dissertation, University of Texas at Austin, December，1994， p. 373.
[5] R. S. Aboutaha， M. D. Engelhardt, J. O. Jirsa and M. E. Kreger，「Retrofit of concrete columns with inadequate
lap splices by the use of rectangular steel jackets」， Earthquake Spectra， November 1996， EERI， California.
[6] M. J. Priestley, F. Seible，Y. Xiao and R. Verma, 「Steel jacket retrofitting of reinforced concrete bridge
columns for enhanced shear strength—Part 1: Theoretical considerations and test design」， J. American
Concrete Institute, 91(4), Detroit, Michigan, 394–405 (July–August 1994).
[7] R. S. Aboutaha，「 Rehabilitation of shear critical concrete columns by use of rectangular steel jackets」，ACI Structural Journal, v 96, n 1, Jan-Feb, 1999, p 68-78
[8] 林草英，「鋼管內填注混凝土柱之軸向承壓強度」，國科會研究報告，1989
[9] Philip F.Boyd, William F.Cofer,and David I.Mclean`，「Seismic Performance of Steel-Encased Concrete Columns under Flexural Loading」，ACI Structural Joumal,Vol.92,No.3,pp355-364，Inc,1995
[10] ACI Committee 318, 「Building Code Requirements for Structural Concrete (ACI 318-02) and Commentary (ACI 318-02)」，American Concrete Institute,Farmington Hills,Michigan,2002
[11] 莊俊賢，「鋼筋混凝土橋柱之耐震評估與補強」，台灣科技大學營建工程系，碩士論文，民國93年6月。
[12] 謝有明，「RC橋柱之鋼板包覆耐震補強」，台灣科技大學營建工程系，碩士論文，民國88年六月。
[13]Aschheim,M., and Moehle, J.P.,(1992)「Shear Strength and Deformability of Reinforced Concrete Bridge Columns Subjected to Inelastic Cyclic Displacement 」，Report No. UCB/EERC-92/04,Earthquake Engineering Research Center,University of California at Berkeley,March.
[14] Priestley, M.J. Nigel Verma, Ravindra; Xiao, Yan，「Seismic shear strength of reinforced concrete columns」，Journal of Structural Engineering, v 120, n 8, Aug, 1994, p 2310-2328
[15] 林草英，「鋼管內部填注鋼筋混凝土結構行為期末報告(III)」，國科會研究報告，1992
[16]羅俊雄，「公路橋梁耐震設計規範修訂草案之研究」，交通部，民國90年。
[17]陳誌良，「鋼管混凝土柱受軸壓與彎矩之行為分析」，成功大學土木工程學系，碩士論文，民國91年六月。
[18]Yue Qing and D.J.Laurie Kennedy，「The flexural behaviour of concrete-filled hollow structural sections」，Department of Civil Engineering,University of Alberta,Edmonton,AB T6G 2G7,Canada，Received August 4, 1993
[19]ATC-40, 「Seismic Evaluation and Retrofit of Concrete Buildings」，Volime1,Volume2,California Seismic Safety Commission,1996
[20]陳生金、鄭明淵、楊國珍，「災時高效率及高經濟型橋梁補強及檢核技術之技術」，交通部公路總局，民國九十三年十二月
[21]Yue Qing Lu and D.J. Laurie Kennedy，「The flexural behaviour of concrete-filled hollow structural sections」，Revised manuscript accepted July 13,1993
[22] Susantha, K.A.S.，「Uniaxial stress-strain relationship of concrete confined by various shaped steel tubes」，Engineering Structures, v 23, n 10, October, 2001, p 1331-134
[23] J. Tang, S. Hino, I. Kuroda and T. Ohta，「Modeling of stress–strain relationships for steel and concrete in concrete filled circular steel tubular columns」. Steel Constr. Eng., JSSC 3 11 (1996), pp. 35–46.
[24] Mander, J. B. ; Priestley, M. J. N. and Park, R.，「THEORETICAL STRESS-STRAIN MODEL FOR CONFINED CONCRETE」，Journal of Structural Engineering, v 114, n 8, Aug, 1988, p 1804-1826