- 摘 要
-
(武漢理工大學(xué)土木工程與建筑學(xué)院， 武漢 430070)
［摘要］為了研究圓端形鋼管混凝土中長柱軸壓性能，考慮長細(xì)比、含鋼率、高寬比3個變化參數(shù)，設(shè)計了6個試件進(jìn)行軸壓靜力單調(diào)加載試驗(yàn)，得到了試件的破壞形態(tài)、極限承載力、荷載-位移曲線、荷載-應(yīng)變曲線等數(shù)據(jù)，并分析參數(shù)變化對承載力的影響。試驗(yàn)結(jié)果表明：圓端形鋼管混凝土中長柱受力過程經(jīng)歷彈性階段、屈服階段與破壞階段，破壞形態(tài)為彈塑性失穩(wěn)破壞；試件承載力與含鋼率呈正相關(guān)，與長細(xì)比呈負(fù)相關(guān)，對于高寬比較大的試件，含鋼率對承載力的影響更大?；谟邢拊浖嗀BAQUS的參數(shù)分析，建立圓端形鋼管混凝土中長柱軸心受壓承載力簡化公式，計算結(jié)果與試驗(yàn)結(jié)果吻合良好。
［關(guān)鍵詞］圓端形鋼管混凝土；中長柱；軸壓試驗(yàn)；承載性能
中圖分類號：TU398 文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)14-0062-07
Experimental study on behavior of intermediate long RCFST columns under axial loads
REN Zhigang, ZHANG Ming, LIU Chuang, WANG Dandan
(School of Civil Engineering and Architecture，Wuhan University of Technology, Wuhan 430070，China)
Abstract: In order to study the axial compressive performance of intermediate long round-ended concrete-filled steel tube (RCFST) columns, the slenderness ratio, steel content ratio and aspect ratio were considered to conduct axial compressive static monotonic loading tests on six designed specimens. The data of failure mode, ultimate bearing capacity, load-displacement curve, load-strain curve and other data of the specimen were obtained, and the influence of parameter variation on bearing capacity was analyzed. The experimental results show that the mechanical process of the intermediate long RCFST columns goes through elastic stage, yield stage and failure stage, and the failure mode is elastoplastic instability failure. The bearing capacity of the specimens is positively correlated with the steel content ratio and negatively correlated with the slenderness ratio. For the specimens with larger height-width-ratio, the steel content ratio has a greater effect on the bearing capacity. Based on the parameter analysis of finite element software ABAQUS, a simplified formula for axial compression capacity of intermediate long RCFST columns was established, and the calculated results were in good agreement with the experimental results.
Keywords:round-ended concrete-filled steel tube (RCFST)； intermediate long column； axial compression test； bearing behavior
*國家自然科學(xué)基金項(xiàng)目(51778512)。
作者簡介：任志剛，博士，教授，博士生導(dǎo)師，Email:whut.ren@163.com。
- 下載地址
-
