钢板-砖砌体组合梁受剪性能试验研究

钢板-砖砌体组合结构是一种新型的托换改造技术.为了掌握钢板-砖砌体组合梁的受剪性能,完成了6根组合梁的静载试验,研究了钢板厚度及螺栓间距对受剪承载力的影响,分析了组合梁受剪破坏的机理.试验结果表明,钢板与砖砌体两者互为帮助、共同工作,剪压区砌体与钢板的破坏并无明显先后顺序.组合梁的破坏总是始于剪压区钢板的局部屈曲,受剪承载力的主要影响因素为侧向钢板的厚度,螺栓间距在一定范围内对承载力影响不大,但是螺栓的布置形式对钢板的失稳破坏形态及承载力起决定性作用.在实际工程中可以对梁两侧上端进行加强约束从而提高梁的抗剪性能.此外,本文给出了组合梁抗剪极限承载力的计算公式.

Experimental Study on Shear Behavior of Steel Plate-masonry Composite Beam

Steel plate-masonry composite(SPMC) construction is a new method for the renovation of existing masonry walled buildings. To understand the shear behavior of the SPMC beam, six composite specimens were tested. The tests took into account the influence of the bolt spacing and the thickness of the steel plate. The shear failure mechanism was also examined.The test results show that the steel-plate and masonry collaborated well, and the damage sequence of both was not obvious. The damage of the composite beams always initiated from the local buckling of the steel plate in the shear-span section. The increase of the thickness of the steel plate significantly improved the critical buckling stress of steel plate and the ductility of the composite beams. Moreover, rather than the bolt-spacing, position arrangement of the bolts in the shear-span section remarkably affected the bearing capacity. Eventually, a design equation was given to calculate the shear capacity of such composite beams.