Experimental and theoretical study on bending behavior of prestressed concrete composite slabs with steel trusses

被引：0
|
作者：
Liu W. [1 ]
Cui S. [1 ]
Liu C. [1 ]
Shi L. [1 ]
机构：
[1] Shandong Academy of Building Research Co., Ltd, Jinan
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷 / 08期
关键词：
Bending behavior; Composite slab; Prestressed concrete; Static test; Steel truss;
D O I：
10.14006/j.jzjgxb.2019.0289
中图分类号：
学科分类号：
摘要：
A composite slab was developed which added steel trusses above the prestressed concrete panels to slove the problems of the current precast panels with low cracking loads and serried supports. Ten specimens, including six precast panels and four composite slabs, were tested to investigate the influence of the type of trusses on the bending behavior of the slabs. The failure modes, cracking loads, load-deflection curves and strain distributions were obtained. The test results show that the cracking loads of precast panels are significantly improved due to the presence of the steel trusses. The crack resistance of the precast panels with steel tube trusses are the highest, which is about 194% of the panel specimens, and the maximum span reaches 9 m. In addition, different failure modes are observed when the various types of steel trusses are used. The failure modes of the plate truss, pipe truss and bar truss are buckling, weld fracture and bar bending, respectively. The collaborative mechanical behavior of the bottom panels and the concrete in composite layers are enhanced by the steel trusses. The bending behavior of the composite slabs is less sensitive to the type of trusses. The cracking loads are the same for the specimens with the different steel trusses, and the difference of the cracking deflection is less than 10%. Based on the testing results, the design formulas for buckling of the trusses were developed. It is recommended that the ultimate load should be the smaller value of that calculated from the cracking moment and the buckling moment. The calculated results are in good agreement with the test results. © 2021, Editorial Office of Journal of Building Structures. All right reserved.
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页码：95 / 106
页数：11
相关论文
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