（1 同济大学建筑设计研究院（集团）有限公司， 上海 200092；2 同济大学土木工程学院， 上海 200092； 3 上海杉达学院， 上海 201209）

［摘要］针对不同剪跨比、翼缘宽厚比、混凝土类型（普通混凝土及轻骨料混凝土）及连杆形式（C型及X型）的部分包覆组合梁，进行了纯弯与剪弯受力状态下的静力性能试验，分析了梁的弹性及塑性承载能力和延性。试验结果表明：部分包覆组合梁的受弯承载能力试验值与采用边缘屈服及全截面塑性理论计算得到的理论值较为接近；试件的位移延性系数在9.84～21.32间，具有较好的变形能力；采用了较小翼缘宽厚比的试件延性较好；配置了轻骨料混凝土的试件延性稍低；配置了不同连杆形式的试件延性相近。

［关键词］部分包覆钢-混凝土组合梁；受弯承载能力；延性；静力试验

中图分类号：TU398+.9文献标识码：A文章编号：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

*科技部重点研发计划项目（2016YFC0701603）。

作者简介：李炜，硕士，工程师，Email:12lw@tjad.cn；通信作者：陈以一，博士，教授，博士生导师，Email: yiyichen@tongji.edu.cn。