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（1 同濟(jì)大學(xué)建筑設(shè)計(jì)研究院（集團(tuán)）有限公司， 上海 200092；2 同濟(jì)大學(xué)土木工程學(xué)院， 上海 200092； 3 上海杉達(dá)學(xué)院， 上海 201209）

［摘要］針對(duì)不同剪跨比、翼緣寬厚比、混凝土類型（普通混凝土及輕骨料混凝土）及連桿形式（C型及X型）的部分包覆組合梁，進(jìn)行了純彎與剪彎受力狀態(tài)下的靜力性能試驗(yàn)，分析了梁的彈性及塑性承載能力和延性。試驗(yàn)結(jié)果表明：部分包覆組合梁的受彎承載能力試驗(yàn)值與采用邊緣屈服及全截面塑性理論計(jì)算得到的理論值較為接近；試件的位移延性系數(shù)在9.84～21.32間，具有較好的變形能力；采用了較小翼緣寬厚比的試件延性較好；配置了輕骨料混凝土的試件延性稍低；配置了不同連桿形式的試件延性相近。

［關(guān)鍵詞］部分包覆鋼-混凝土組合梁；受彎承載能力；延性；靜力試驗(yàn)

中圖分類號(hào)：TU398+.9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2021)07-0030-08

Experimental study on bending capacity and ductility of partially-encased composite steel and concrete beams

LI Wei1, CHEN Yiyi2,3

(1 Tongji Architectural Design(Group) Co., Ltd., Shanghai 200092, China; 2 College of Civil Engineering, Tongji University, Shanghai 200092, China; 3 Sanda University, Shanghai 201209, China)

Abstract:To investigate the bending capacity and ductility of partially-encased composite steel and concrete (PEC) beam, specimens with different shear span ratios, flange width-thickness ratios, concrete types (ordinary concrete and light-weight aggregate concrete) and link types (C-shaped and X-shaped) were designed and tested under the condition of pure bending and shear bending. Experiment results show that the experimental value of the bending capacity of the partially-encased composite beam is relatively close to the theoretical value calculated by the margin yielding and full-section plastic theory. The displacement ductility coefficient of specimens can reach about 9.84～21.32, which indicate that PEC beams have good ductility. Specimens with smaller flange width-thickness ratio perform better on ductility. Specimens with light-weight aggregate concrete perform not so good as common concrete on ductility. Specimens with different types of link perform almost the same on ductility.

Keywords:partially-encased composite steel and concrete beam;bending capacity;ductility;static experiment

*科技部重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2016YFC0701603）。

作者簡(jiǎn)介：李煒，碩士，工程師，Email:12lw@tjad.cn；通信作者：陳以一，博士，教授，博士生導(dǎo)師，Email: yiyichen@#edu.cn。