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（1 湖北工程學(xué)院土木工程學(xué)院， 孝感 432000； 2 武漢大學(xué)土木建筑工程學(xué)院， 武漢 430072）

［摘要］鋼管RPC結(jié)構(gòu)是一種承載力極高延性優(yōu)良的新型結(jié)構(gòu)，鋼管對(duì)RPC的約束效果與普通鋼管混凝土有差別。為建立適合于鋼管RPC短柱軸壓承載力計(jì)算公式，收集相關(guān)文獻(xiàn)數(shù)據(jù)，基于極限平衡理論選用不同的核心RPC約束強(qiáng)度準(zhǔn)則對(duì)鋼管RPC短柱軸壓承載力進(jìn)行了計(jì)算分析。結(jié)果表明：極限平衡理論可用于鋼管RPC短柱軸壓承載力計(jì)算，但其計(jì)算精度依賴于RPC常規(guī)三軸強(qiáng)度屈服準(zhǔn)則；鋼管對(duì)RPC的強(qiáng)度約束效果相比普通混凝土弱，現(xiàn)階段采用極限平衡理論求解鋼管RPC短柱軸壓承載力時(shí)，建議核心RPC采用k=3的線模型屈服準(zhǔn)則，而高圍壓的核心RPC屈服準(zhǔn)則還有待進(jìn)一步的研究與探討。研究成果可為鋼管RPC柱的工程設(shè)計(jì)和相關(guān)規(guī)范修訂提供理論依據(jù)。

［關(guān)鍵詞］極限平衡理論； 鋼管RPC短柱； 約束強(qiáng)度準(zhǔn)則； 軸壓承載力

中圖分類號(hào)：TU375-3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)05-0135-05

Analysis of axial compressive bearing capacity for RPC filled steel stub columns based on the limit equilibrium theory

Yan Yanxiang1, Li Biao2, Tong Youzhi1, Li Xiaomu1, Liu Jinjun1

(1 School of Civil Engineering， Hubei Engineering University， Xiaogan 432000, China；2 School of Civil ＆ Architecture Engineering， Wuhan University, Wuhan 430072, China)

Abstract:Reactive powder concrete（RPC）filled steel tube structure is a new structure with extremely high bearing capacity and excellent ductility. The confinement effect of steel tube on RPC is different from ordinary concrete. In order to establish the calculation formula for the axial bearing capacity of RPC filled steel stub columns, the relevant literature data was collected for formula verification, and the strength of RPC filled steel stub columns under axial compression was analyzed according to the limit equilibrium theory of concrete filled steel tube and different  constraint strength criteria of core RPC. The results show that the limit equilibrium theory can be used to calculate the axial bearing capacity of RPC filled steel stub columns, but its computational accuracy depends on the conventional tri-axial strength yield criterion of RPC. The constraint strength of steel tube on RPC is weaker than that of ordinary concrete. At the present stage, when the limit equilibrium theory is used to calculate the axial bearing capacity of RPC filled steel stub columns, it is suggested that the line model yield criterion of k=3 is adopt for the core RPC, and further research and discussion is needed for the yield criterion of core RPC with high confining pressure. The research results can provide references for engineering design and theoretical support for specifications revision of RPC filled steel stub columns.

Keywords:limit equilibrium theory; RPC filled steel stub column; constraint strength criterion; axial bearing capacity

*孝感市自然科學(xué)計(jì)劃項(xiàng)目（XGKJ2019010049），湖北省教育廳科學(xué)技術(shù)研究項(xiàng)目（Q20182706）。

作者簡介：顏燕祥，博士研究生，講師，Email：yyxtm@163.com。