- 摘 要
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(1 西安建筑科技大學土木工程學院,西安 710055;2 西安建筑科技大學西部綠色建筑國家重點實驗室,西安 710055;3 西安建筑科技大學結(jié)構(gòu)工程與抗震教育部重點實驗室,西安 710055)
摘要: 為提高方鋼管混凝土短柱軸壓承載力的計算精度和效率,收集了國內(nèi)外 167 個方鋼管混凝土短柱的軸壓試驗資料;探討了方鋼管混凝土短柱在兩種不同加載方式下的破壞機理,闡明了方鋼管混凝土短柱軸壓極限承載力不受加載方式影響的原因;引入“約束效應(yīng)”系數(shù),分析了混凝土強度、鋼管強度、鋼管寬厚比(B/ t)對“約束效應(yīng)”的影響;以極限平衡理論為基礎(chǔ),從方鋼管混凝土短柱的理想軸壓極限狀態(tài)出發(fā),推導(dǎo)了軸壓承載力計算公式;考慮了方鋼管對核心混凝土約束的不均勻問題,從而修正了方鋼管混凝土短柱的軸壓承載力計算公式.計算結(jié)果表明:該計算方法能夠準確計算出方鋼管混凝土短柱的軸壓承載力.將該計算方法與中、美兩國規(guī)范計算方法對比后發(fā)現(xiàn),該方法計算結(jié)果比中國規(guī)范略微保守,較美國規(guī)范經(jīng)濟.該公式可以應(yīng)用于 B/ t≥20 的方鋼管混凝土短柱軸壓承載力計算.
關(guān)鍵詞: 方鋼管混凝土短柱;軸壓承載力計算;極限平衡理論;破壞機理;公式修正
中圖分類號:TU398 文獻標志碼:A 文章編號:1002-848X(2022)18-0065-07
DOI:10.19701 / j.jzjg.20201379
Research on simplified calculation method of axial compressive bearing capacity ofconcrete-filled square steel tubular short column
MA Licheng1,SHI Qingxuan1,2,3,WANG Qiuwei1,2,3
(1 School of Civil Engineering,Xi’an University of Architecture & Technology,Xi’an 710055,China;2 State Key Laboratory of Green Building in Western China,Xi’an University of Architecture & Technology,Xi’an 710055,China;3 Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture & Technology,Xi’an 710055,China)
Abstract: To improve the calculation accuracy and efficiency of axial compressive bearing capacity of concrete-filled squaresteel tubular ( CFST) short columns,the axial compressive test data of 167 specimens of CFST short columns werecollected. The failure mechanism of CFST short columns was discussed under two different loading modes,and the reasonwas clarified why the axial compression ultimate bearing capacity of CFST short column was not affected by loading modes.The influence of concrete strength,steel tubular strength and steel tubular width thickness ratio(B/ t) on restraint effect wasanalyzed by introducing restraint effect coefficient. Based on limit equilibrium theory,the formula for calculating the axialcompressive bearing capacity was deduced from the ideal axial compression limit state of the CFST short column. Theproblem of confinement non-uniformity was considered with square steel tube to core concrete,and the formula forcalculating the axial compressive bearing capacity of CFST short column was modified. The calculation results show that themethod can accurately calculate the axial compressive bearing capacity of CFST short columns. Compared with thecalculation method of Chinese and America standard,it was found that the calculation result of the method is moreconservative than that of China and more economical than that of America. The formula could be used to calculate the axialcompressive bearing capacity of CFST short columns of B/ t≥20.
Keywords: concrete-filled square steel tubular short column;axial compressive bearing capacity calculation;limitequilibrium theory;failure mechanism;formula correction
∗國家自然科學基金面上項目(51878540,51878543),國家重點研發(fā)計劃課題(2017YFC0703406).
第一作者:馬立成,博士研究生,主要從事高層建筑結(jié)構(gòu)及其抗震研究,Email:licheng_ma@ 163. com.
[引用本文] 馬立成,史慶軒,王秋維. 方鋼管混凝土短柱的軸壓承載力簡化計算方法研究[ J]. 建筑結(jié)構(gòu),2022,52 ( 18 ): 65-71. MA Licheng,SHI Qingxuan,WANG Qiuwei. Research on simplified calculation method of axialcompressive bearing capacity of concrete-filled square steel tubular short column[ J]. Building Structure,2022,52(18):65-71.
