（广西科技大学土木建筑工程学院， 柳州 545006）

［摘要］部分外包钢预应力组合梁是一种预应力新型结构，在施加单调荷载条件下，对8根部分外包钢预应力组合梁进行试验研究，其中1根为未施加预应力的普通组合梁，7根为施加不同张拉控制应力的部分外包钢预应力组合梁，通过变换预应力大小来研究该类型组合梁承载力性能。结合理论分析、公式推导以及国内外的研究文献，计算并推导其构件的承载力公式，对构件的开裂荷载、极限荷载进行了详细计算。其最终的理论计算值均与试验结果吻合良好，为该新型组合梁在实际工程中的应用与推广提供了理论基础。

［关键词］部分外包钢预应力组合梁； 预应力； 开裂荷载； 极限荷载

中图分类号：TU378文献标识码：A文章编号：1002-848X(2019)23-0060-04

Test and research on design method of bearing capacity of  partially-encased steel prestressed composite beam

Zhang Peng, Shen Minhe, Deng Yu, Qin Xuansheng

(Department of Civil Engineering and Architecture， Guangxi University of Science and Technology， Liuzhou 545006， China)

Abstract:The partially-encased steel prestressed composite  beam is a new type of prestressed structure. Under the condition of monotonic loading, eight partially-encased steel prestressed composite  beams were tested. One of them was an ordinary composite beam without prestress force, and the other seven beams were a prestressed composite beam with different tension control stresses. The bearing capacity of this type of composite beam was studied by changing the prestress force. Combining with theoretical analysis, formula derivation and domestic and foreign research literature, the bearing capacity formula of the component was calculated and deduced, and the cracking load and ultimate load of the component were calculated in detail. The final theoretical calculation results were in good agreement with the experimental results, providing a theoretical basis for the application and popularization of this new composite beam in the practical engineering.

Keywords:partially-encased steel prestressed composite beam; prestress force; cracking load; ultimate load

*国家自然科学基金资助项目（51568008），广西自然科学基金项目(2015GXNSFAA139263)，广西科技大学研究生教育创新计划项目（GKYC201814），2018广西高校中青年教师基础能力提升项目（2018KY0315）。

作者简介：张鹏，博士，教授，Email:gxutzp@126.com。