摘要
为解决装配式建筑中普通混凝土叠合梁因自重大不利于抗震的问题,提出了预应力次轻混凝土叠合梁。首先,开展了次轻混凝土的配合比设计与优化工作。随后,对试件进行了受弯性能试验,研究预制叠合高度比、受拉钢筋配筋率和混凝土材料种类对叠合梁破坏机理、受弯承载力、短期刚度等性能的影响,并将次轻混凝土叠合梁的受力性能与整浇梁进行对比。结果表明:次轻混凝土叠合梁与普通混凝土叠合梁的极限承载力较为接近,但前者的平均裂缝间距更小;叠合高度比对次轻混凝土叠合梁受弯性能的影响并不显著,但提高配筋率最大可使叠合梁的极限承载力提高35.6%;次轻混凝土叠合梁的力学性能和变形规律与整浇梁基本一致,对该类叠合梁的开裂荷载、极限承载力及平均裂缝间距进行了计算,理论计算值与试验数据吻合较好,计算次轻混凝土叠合梁短期刚度时建议乘以0.9的系数。
To address the drawback that the heavy self-weight of ordinary concrete composite beams in prefabricated buildings was not conducive to seismic resistance,prestressed sublightweight concrete composite beams were proposed.Firstly,the mix proportion design and optimization work of sub-lightweight concrete was carried out.Subsequently,flexural performance tests were conducted on the specimens to study the effects of the prefabricated composite height ratio,the reinforcement ratio of tensile reinforcement bars,and the type of concrete material on the failure mechanism,flexural bearing capacity,short-term stiffness and other properties of the composite beam.The mechanical performance of the sublightweight concrete composite beam was compared with that of the integral cast beam.The results show that the ultimate bearing capacity of sub-lightweight concrete composite beams is relatively close to that of ordinary concrete composite beams,but the average crack spacing of the former is smaller.The composite height ratio has no significant influence on the flexural performance of the sublightweight concrete composite beam,but increasing the reinforcement ratio can increase the ultimate bearing capacity of the composite beam by up to 35.6%.The mechanical properties and deformation laws of sublightweight concrete composite beams are basically the same as those of integral cast beams.The cracking load,ultimate bearing capacity and average crack spacing of this type of composite beam were calculated.The theoretical calculation values are in good agreement with the test data.When calculating the short-term stiffness of sublightweight concrete composite beams,it is recommended to multiply by a coefficient of 0.9.
作者
宋兴禹
刘雁
邹新兴
魏春明
SONG Xing-yu;LIU Yan;ZOU Xin-xing;WEI Chun-ming(College of Civil Engineering and Transportation,Yangzhou University,225000,Yangzhou,Jiangsu,China;Jiangsu Huajian Construction Co.,Ltd.,225002,Yangzhou,Jiangsu,China)
出处
《建筑技术》
2025年第20期2497-2502,共6页
Architecture Technology
基金
国家自然科学基金资助项目(51878590)。
关键词
次轻混凝土
叠合梁
受弯性能
设计计算
semi-lightweight concrete
composite beam
bending performance
design calculation
