预应力陶粒混凝土叠合梁疲劳性能试验研究  

Experimental Research on Fatigue Performance of Prestressed Ceramsite Concrete Composite Beams

作　　者：李鹏飞 冯楚祥 诸成烽 肖自强 贺智敏[1,2] 王建民[1] LI Pengfei;FENG Chuxiang;ZHU Chengfeng;XIAO Ziqiang;HE Zhimin;WANG Jianmin(School of Civil Engineering and Environment,Ningbo University,Ningbo 315211,China;Collaborative Innovation Center of Coastal Urban Rail Transit,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学土木与环境工程学院,浙江宁波315211 [2]宁波大学滨海城市轨道交通协同创新中心,浙江宁波315211

出　　处：《工业建筑》2022年第8期103-110,共8页Industrial Construction

基　　金：国家自然科学基金项目(51878360);宁波市自然科学基金项目(202003N4136);宁波大学滨海城市轨道交通协同创新中心开放基金(2020004)。

摘　　要：为研究预应力叠合梁施工工艺对叠合梁疲劳力学性能的影响,进行等幅疲劳试验。制作了4根预应力陶粒混凝土与普通混凝土叠合梁,其中两根进行三等分静力加载,两根进行三等分点疲劳受弯试验分析。试验结果表明,预应力陶粒混凝土T梁构件的受弯性能随着疲劳循环次数的增加在不断衰减;随着疲劳加载次数增加,同级静载作用下挠度值和钢筋应变值总体上呈现增长趋势,但变化幅度较小;最大裂缝宽度和平均裂缝宽度随着疲劳循环次数的增加而增大;对于循环加载200万次未发生疲劳破坏的试验梁,静载破坏形式仍为典型的受弯破坏,且其剩余承载能力相对于静载试验梁有一定明显降低,且后张预应力梁相比于先张预应力梁下降程度更为明显。In order to study the influence of construction technology on the fatigue performance of pre-stressed composite beams, the constant-amplitude fatigue experiment was carried out.Four pre-stressed ceramsite concrete and ordinary concrete composite beams were fabricated, two of which were subjected to two-point static loading and two were subjected to two-point fatigue bending. The experiment results showed that the flexural performance of prestressed ceramsite concrete T-beam members was continuously attenuated with the increase of the number of fatigue cycles. As the number of fatigue loading increased, the deflection value and the strain value of steel bars under the static load of the same level generally showed an increasing trend, but the magnitude of the change was small. The maximum crack width and average crack width increased with the increase of the number of fatigue cycles. For the test beams that had experienced cyclic loading 2 million times without fatigue failure, the failure mode under static loading was still typical bending failure, and its residual bearing capacity was significantly lower than that of the test beams under static loading, and the post-tensioned prestressed beam had a more obvious decline compared to the pre-tensioned prestressed beam.

关 键 词：疲劳性能 T形叠合梁 陶粒混凝土 预应力 受弯破坏 

分 类 号：TU378.2[建筑科学—结构工程]