（1 宁波大学土木与环境工程学院， 宁波 315211； 2  平湖市住房和城乡建设局建筑工程管理处， 嘉兴 314000；  3  宁波市房屋建筑设计研究院有限公司， 宁波 315000）

［摘要］综合利用普通混凝土的高抗压性能及陶粒混凝土良好延性及自重轻的优点，研究上部采用普通混凝土、下部采用陶粒混凝土的新型叠浇梁的抗剪力学性能。通过制作5根下部采用陶粒混凝土、上部采用普通混凝土叠浇而成的简支梁和1根全陶粒混凝土简支梁，并进行抗剪性能试验研究，分析不同配箍率和叠浇间隔时间对叠浇梁的挠度、最大斜裂缝宽度、箍筋应变和极限承载力的影响，研究叠浇梁的破坏形态及叠浇梁的整体性。结果表明，随着配箍率的增大，跨中挠度和最大斜裂缝宽度减小，极限承载力增大。适当增长叠浇间隔时间，能够提高叠浇梁抗剪性能。叠浇梁的工作整体性良好，具有可推广性。

［关键词］陶粒混凝土； 抗剪性能； 配箍率； 叠浇梁

中图分类号：TU375文献标识码：A文章编号：1002-848X(2019)17-0098-05

Experimental study on shear performance of stack-poured beams made from different characteristic concrete

Wang Yiming1，2， Wang Jianmin1， Liu Anqing1， Cheng Bo3

(1 College of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, China； 2 Architectural Engineering Management Office of  Pinghu Housing and Construction Burea, Jiaxing 314000, China； 3  Architectural Design & Research Institute of Ningbo Housing Co., Ltd., Ningbo 315000, China)

Abstract:Based on the high compressive strength of ordinary concrete and the good ductility and light weight of ceramsite concrete, the shear performance of new stack-poured beams with ordinary concrete at the top and ceramsite concrete at the bottom was studied. Five simply supported  beams with full ceramsite concrete at the lower part, ordinary concrete at the upper part and one simply supported  beam with full ceramsite concrete were fabricated to carry out shear performance experiments. The effects of different stirrup ratios and stack-poured time intervals on the deflection, maximum inclined crack width, stirrup strain and ultimate bearing capacity of the stack-poured beams were analyzed. The failure modes and the integrity of the stack-poured beams were investigated. The results show that with the increase of stirrup ratio, the mid-span deflection and maximum inclined crack width decrease, and the ultimate bearing capacity increases. Increasing the stack-poured time interval is beneficial to the shear resistance of stack-poured beams. The working integrity of the stack-poured beams is good and can be popularized.

Keywords:ceramsite concrete; shear performance; stirrup ratio; stack-poured beam

*国家自然科学基金(51878360,51778302),浙江省自然科学基金(LY18E080008)。

通讯作者：王建民，副教授，硕士生导师，Email: wangjianmin@nbu.edu.cn。