钢板-砖砌体组合梁弯剪扭复合受力性能试验研究

Experimental study of steel plate-masonry composite beams under hybrid forces of bending,shear and torsion

钢板-砖砌体组合结构托换是一种新型的、对既有砌体房屋进行大空间改造加固的技术。为了掌握钢板-砖砌体组合梁的弯剪扭复合受力性能,共完成了6根钢板-砖砌体组合梁在弯剪扭复合作用下的静载试验;考虑了外包钢板厚度、螺栓间距与设置钢盖板对钢板-砖砌体组合梁的影响,得到其破坏形态、极限承载力、扭矩-扭率曲线以及钢板的应变。试验结果表明:钢板厚度以及设置钢盖板对钢板-砖砌体组合梁的承载力与刚度的影响较大,螺栓间距对承载力的影响较小。此外,在工程应用中应加强梁间节点设计。

Steel plate-masonry composite structure is a new type of strengthening technique applied to reconstruct and strengthen existing masonry buildings with large space. To investigate the behavior of steel plate-masonry composite beams under bending, shear and torison, a total of six specimens were fabricated and tested. Influences of thickness of steel plate, spacing of binding bolts and covered steel plate were considered to obtain the results of failure mode, ultimate load-carrying capacity, torque-torsion rate curves and strain of steel plate. The experimental results show that the thickness of steel plate and the covered steel plate have great effect on the uhimate bearing capacity and stiffness of composite beams, while the spacing of binding bolts has little effects. Furthermore, the design of joint between beams should be strengthened in practical applications.