双向预应力混凝土钢桁架叠合板抗弯性能试验研究与参数分析  

EXPERIMENTAL STUDY AND PARAMETRIC ANALYSIS ON FLEXURAL PROPERTIES OF BILATERAL PRESTRESSED COMPOSITE CONCRETE SLABS WITH STEEL TRUSSES

作　　者：刘文政 崔士起 LIU Wenzheng;CUI Shiqi(Shandong Academy of Building Research Co.,Ltd.,Jinan 250031,China)

机构地区：[1]山东省建筑科学研究院有限公司,济南250031

出　　处：《工业建筑》2021年第2期32-39,31,共9页Industrial Construction

基　　金：住房和城乡建设部科学技术项目(2017-K9-056);山东省墙材专项基金项目(鲁财建指(2014)139号)。

摘　　要：通过双向施加预应力和增设钢桁架方式,提出了一种新型双向预应力混凝土钢桁架叠合板。为研究不同类型桁架对预制底板抗弯性能的影响,对4块预制底板试件开展了静力荷载试验,得到了其破坏特征、开裂荷载、挠度曲线及应变分布等。试验结果表明:双向预应力混凝土钢桁架预制底板呈现双向受力特征,钢桁架能够显著提高预制底板的抗弯刚度、抗裂性能及承载能力,并有效改善底板试件的延性破坏特征;钢板桁架、钢管桁架及钢筋桁架底板试件均能满足施工阶段不设置竖向支撑的要求。通过参数化有限元分析得出,桁架高度、底板厚度对预制底板抗弯刚度、抗裂性能影响显著,增加预应力筋数量有助于提高预制底板的抗裂性能,对增强抗弯刚度影响较小。A novel concrete composite slab was put forward by means of adding steel trusses and applying bilateral prestresses.The four specimens were tested to investigate the flexural behaviors of slabs influenced by the types of trusses.The failure modes,cracking loadings,loading deflection relationships and strain distributions,etc.were obtained by contrast experiments.The test results showed that the bilateral prestressed concrete precast panels present obviously bidirectional bending characteristics,and the bending stiffness,the cracking resistance,the bearing capacity and the ductile failure of precast panels were significantly improved due to adding steel trusses.In addition,precast panels with steel plate trusses,steel tube trusses and steel bar trusses all could meet the requirements of no supporting.By finite element parameter analysis,it was concluded that the height of trusses and the thickness of concrete had significant influence on the bending stiffness and the cracking resistance of precast panels.Meanwhile,the number of prestressing tendons had great effects on the cracking resistance but little influence on the bending stiffness.

关 键 词：叠合板 双向预应力 钢桁架 静力试验 抗弯性能 

分 类 号：TU378[建筑科学—结构工程]