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（武漢理工大學(xué)土木與建筑學(xué)院， 武漢 430070）

［摘要］圓端形鋼管混凝土短柱受力機(jī)理相較于圓形和矩形截面更加復(fù)雜，目前還沒有一個(gè)定量的表達(dá)式用于計(jì)算圓端形鋼管混凝土短柱軸壓和偏壓的承載力。為分析研究圓端形鋼管混凝土短柱軸壓和偏壓的承載力性能，進(jìn)行了8個(gè)圓端形鋼管混凝土短柱軸壓試驗(yàn)和6個(gè)圓端形鋼管混凝土短柱偏壓試驗(yàn)，分別基于雙剪切統(tǒng)一強(qiáng)度理論和極限平衡理論推導(dǎo)出相對應(yīng)的圓端形鋼管混凝土短柱軸壓承載力計(jì)算公式，用Python語言編制基于纖維模型法的承載力計(jì)算程序，最后提出了適用于圓端形鋼管混凝土短柱軸壓和偏壓的統(tǒng)一承載力公式，并用試驗(yàn)數(shù)據(jù)對公式進(jìn)行驗(yàn)證。結(jié)果表明：基于雙剪切統(tǒng)一強(qiáng)度理論、極限平衡理論及纖維模型法推導(dǎo)的三種軸壓承載力計(jì)算理論公式均具有較好的精度，滿足工程要求，DBJ/T 13-51規(guī)范所計(jì)算的承載力偏小，計(jì)算結(jié)果精確度最差。推導(dǎo)的三種理論公式中基于雙剪切統(tǒng)一強(qiáng)度理論推導(dǎo)的承載力計(jì)算公式精度最高，更適用于圓端形鋼管混凝土短柱軸壓承載力計(jì)算。最后驗(yàn)證了修正的圓端形鋼管混凝土短柱軸壓和偏壓承載力統(tǒng)一公式的準(zhǔn)確性，計(jì)算偏壓的適用范圍為e/R≤1.55。

［關(guān)鍵詞］圓端形鋼管混凝土；雙剪切統(tǒng)一強(qiáng)度理論；極限平衡理論；纖維模型法；極限承載力

中圖分類號：TU398文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)07-0038-08

Study on calculating method of ultimate bearing capacity of round-ended concrete filled steel tube short columns 

REN Zhigang, LIU Chuang, WANG Dandan, WEI Wei

(School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China)

Abstract:The mechanical behavior of round-ended concrete filled steel tube (RCFST) short column is more complex than that of short columns with circular and rectangular sections. At present, there is no quantitative expression for calculating the bearing capacity of RCFST short columns under axial and eccentric loads. In order to analyze and study the axial and eccentric load bearing capacity performance of the RCFST short columns, axial compression tests were carried out on 8 RCFST short columns and eccentric compression tests were carried out on 6 RCFST short columns. Based on the double-shear unified strength theory and the limit equilibrium theory, the corresponding calculation formulas for the axial compression bearing capacity of RCFST short columns were derived. Python language was used to compile the calculation program of bearing capacity based on fiber model method. Finally, a unified bearing capacity formula suitable for RCFST short columns under axial and eccentric loads was proposed, and the formula was verified by experimental data. The results show that the three theoretical formulas for calculating the axial compression bearing capacity derived based on the double-shear unified strength theory, the limit equilibrium theory and the fiber model method all have good accuracy and meet the engineering requirements. The bearing capacity calculated by the DBJ/T 13-51 code is small, and the calculation result has the worst accuracy. Among the three theoretical formulas derived, the bearing capacity calculation formula derived based on the double-shear unified strength theory has the highest accuracy, and is more suitable for calculation of the axial compression bearing capacity of RCFST short columns. Finally, the accuracy of the revised uniform formula for the bearing capacity of RCFST short columns was verified, and the applicable range for calculating the bias was e/R≤1.55.

Keywords:round-ended concrete filled steel tube;double-shear unified strength theory;limit equilibrium method;fiber model method;ultimate bearing capacity

*國家自然科學(xué)基金（51778512），武漢理工大學(xué)研究生優(yōu)秀學(xué)位論文培育項(xiàng)目資助（2018-YS-046）。

作者簡介：任志剛，博士，教授，博士生導(dǎo)師，Email: renzg@163.com；通信作者：劉闖，碩士研究生，Email: 371087914@qq.com。