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   伍云天^1,2，  姜?jiǎng)P旋²
   （1 重慶大學(xué)山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室，重慶 400045； 2 重慶大學(xué)土木工程學(xué)院，重慶400045）

[摘要] 為了將鋼套管約束技術(shù)合理應(yīng)用于新建橋梁柱，以部分或完全取代柱底塑性鉸區(qū)域傳統(tǒng)的加密箍筋約束做法，從而提高橋梁柱的施工簡易性、震后可修復(fù)性并充分發(fā)揮約束混凝土的優(yōu)勢(shì)，提出了局部鋼套管約束RC柱的等效化設(shè)計(jì)方法及相應(yīng)的施工過程，進(jìn)行了一組傳統(tǒng)箍筋約束RC柱與局部鋼套管約束RC柱在恒定軸壓力和水平低周往復(fù)加載下的初步對(duì)比試驗(yàn)，并利用OpenSEES程序?qū)筛嚰M(jìn)行了數(shù)值模擬分析。試驗(yàn)結(jié)果表明，局部鋼套管約束柱試件與傳統(tǒng)箍筋約束RC柱試件具有相似的剛度、承載力與延性性能，數(shù)值模擬結(jié)果與試驗(yàn)結(jié)果符合較好。通過對(duì)兩根柱試件試驗(yàn)現(xiàn)象及理論分析結(jié)果進(jìn)行對(duì)比，證明了約束效應(yīng)等效化原則設(shè)計(jì)方法的有效性，局部鋼套管約束RC柱能夠通過合理設(shè)計(jì)取得與傳統(tǒng)箍筋約束RC柱相似的抗震表現(xiàn)。最后對(duì)進(jìn)一步研究提出了建議。
[關(guān)鍵詞] 鋼套管；約束混凝土；試驗(yàn)；數(shù)值模擬
中圖分類號(hào)：TU398+.9    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2012) Sl-0742-04

Experimental study on partially steel tube-confined RC column
Wu Yuntian^1,2, Jiang Kaixuan²
(1 Key Lab of Clunese Education Miustry for Construction and New Technology of Mountain Cities, Chongqing University, Chongqing 400045, China; 2 College of Civil Engineering, Chongqing University, Chongqing 400045, China)

Abstract: In tlus study the steel jacketing technology was proposed to be used in new design bridge columns. By partially or completely replacing the transverse hoops conventionally used for confinement at the plastic hinge regions at column ends with extemally installed steel tube, the constructability and post-earthquake repairability of bridge columns can be improved and better confinement effect can be achieved. The design approach for the proposed partially tube confmed RC (PTCRC) column based on confinement effect equivalence principle and the corresponding construction process were suggested. A pair of specimens consisting of a conventional RC column and a PTCRC column was tested under constant axial load and low cycle reversed horizontalload. The OpenSEES program was used to numerically simulate the behavior of the tested specimens. Test results show that the PTCRC column exhibits sinular performance to the conventional RC column in terms of stiffness, strength and deformation characteristics. The numerical simulation results agree well with the test results. Based on the comparison of experimental and theoretical results between the two specimens, it is verified that the design approach following the confinement effect equivalence principle is effective. The proposed partially tube confined RC column can be designed to have similar seismic behavior to the conventional RC column. Further research needs are also pointed out in tlus paper.
Keywords: steel tube; confined concrete; experiment; numerical simulation