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［提要］  混凝土矩形柱在FRP側(cè)向強約束作用下，極限應(yīng)力、極限應(yīng)變的提高系數(shù)與FRP的包裹量及截面形狀、特征有關(guān)。在對國內(nèi)外大量試驗結(jié)果分析的基礎(chǔ)上，提出了FRP強約束混凝土矩形柱極限應(yīng)力、極限應(yīng)變的計算方法；FRP強約束矩形混凝土柱的應(yīng)力應(yīng)變?nèi)^程曲線可分為三段，第一、三段表現(xiàn)為線性特性，第二段為過渡區(qū)域，呈現(xiàn)非線性特性，但非常短暫，給出了兩個能夠反映曲線特征的應(yīng)力應(yīng)變關(guān)系模型，其預(yù)測結(jié)果與相關(guān)文獻(xiàn)試驗曲線符合很好；對影響FRP強約束矩形截面混凝土應(yīng)力應(yīng)變關(guān)系的參數(shù)進(jìn)行了研究。

［關(guān)鍵詞］  FRP  約束  矩形柱  應(yīng)力應(yīng)變  模型

Study on Stressstrain Relationship for Concrete Rectangular Columns Sufficiently Confined with FRP/Wei Yang1, Wu Gang1，2, Wu Zhishen2，3,Lü Zhitao1, Guo Zhengxing1(1 College of Civil Engineering, Southeast University, Nanjing 210096, China; 2 International Institute for Urban Systems Engineering, SEU, Nanjing 210096, China; 3 Department of Urban & Civil Engineering, Ibaraki University, Hitachi 3168511, Japan)

Abstract:For rectangular columns sufficiently confined with external FRP, the improvement of ultimate stress and stain is related to the amount of FRP and the shape and characteristics of the cross section. Based on the investigation on a large number of test results, equations predicting ultimate stress and stain were proposed. The stress strain curves of concrete rectangular columns sufficiently confined with FRP can be divided into three successive regions. The first and third regions are linear and the second region for the transition region shows nonlinear nature with very short extent. Two models which could reflect the characteristics of stress strain response were suggested. The predictions of the models are shown to agree well with test curves available in literatures. Finally, the parameters in the models were discussed.

Keywords:FRP; confinement; rectangular columns; stressstrain; models

1)東南大學(xué)土木工程學(xué)院，南京，210096；2)東南大學(xué)城市工程科學(xué)國際研究中心，南京

，210096；3)日本茨城大學(xué)工學(xué)部，日立 316.8511。