（1 郑州大学土木工程学院， 郑州 450001； 2 郑州大学综合设计研究院有限公司， 郑州 450003）

［摘要］对3根不同配筋率下采用HRB500组合封闭箍筋和纵筋的钢筋轻骨料混凝土叠合梁和3根对比试件进行了受弯性能试验，对叠合梁的正截面受弯承载力、抗裂性、挠度以及裂缝开展情况进行了分析。结果表明：采用HRB500组合封闭箍筋和纵筋的钢筋轻骨料混凝土叠合梁的破坏形态、受弯性能与整浇对比梁相近，梁正截面的平截面假定仍然适用，正截面受弯承载力、开裂荷载及挠度仍可按照现行规程JGJ 12—2006中的计算公式计算。

［关键词］HRB500钢筋； 轻骨料混凝土； 叠合梁； 受弯承载力； 挠度

中图分类号：TU375-1， TU528-2文献标识码：A文章编号：1002-848X(2019)22-0088-05

Experimental study on flexural behavior of lightweight aggregate concrete composite beams with HRB500 rebars

Sun Gangzhu1, Zhong Xiangwei1, Yu Qiubo1,2, Li Xuejia1

(1 College of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China; 2 Zhengzhou University Comprehensive Design and Research Institute Co., Ltd., Zhengzhou 450003, China)

Abstract:Flexural behavior experiments were carried out on three reinforced lightweight aggregate concrete composite beams and three comparative specimens with HRB500 combined closed stirrups and longitudinal reinforcements under different reinforcement ratios, and the normal section flexural bearing capacity of the composite beams, the crack resistance, deflection and crack development were analyzed. The results show that the failure modes and flexural behaviors of the reinforced lightweight aggregate concrete composite beams with HRB500 combined closed stirrups and longitudinal reinforcement are similar to those of the cast-in-place comparison beams. The flat section assumption of the beam normal section is still applicable, and the normal section bending capacity, cracking load and deflection can still be calculated according to the calculation formula in the current regulation JGJ 12—2006.

Keywords:HRB500 rebar; lightweight aggregate concrete; composite beam; bending capacity; deflection

*2016年河南省科技攻关（162102310190）。

作者简介：孙钢柱，博士，教授级高级工程师，硕士生导师，Email:slsyxdy@163.com。