H型钢-再生混凝土板组合梁抗剪性能试验

Experimental Study on Shear Performance of H-Shaped Steel-Recycled Aggregate Concrete Composite Beam

目前H型钢-再生混凝土板组合梁抗剪性能的试验研究较少。进行了5个H型钢-再生混凝土板组合梁足尺试件抗剪性能试验,各试件尺寸一致:梁净跨3 000 mm,H型钢型号采用HN200×200×6×6,再生混凝土板宽300 mm、厚100 mm;H型钢与再生混凝土板通过栓钉连接。试件的再生粗骨料取代率分为0%、50%、100%,混凝土强度等级分为C30、C60。对比分析了不同设计参数试件的抗剪性能,以及设计参数对试件抗剪性能的影响,结果表明:H型钢-再生混凝土板组合梁,采用栓钉连接构造受力可靠,H型钢与再生混凝土板共同工作性能良好;不同再生粗骨料取代率下H型钢-再生混凝土板组合梁受剪性能和破坏形态接近;提高再生混凝土强度可以显著提高试件的抗剪承载力、刚度和变形能力。

At present,there are few experimental studies on the shear behavior of H-beam recycled aggregate concrete slab composite beams. The shear performance of five full-scale specimens of H-beam recycled aggregate concrete slab composite beams is tested. The size of each specimen is the same. The clear span is3 000 mm,the model of H-shaped steel is HN200×200×6×6,the width of recycled aggregate concrete slab is300 mm and the thickness is 100 mm. H-shaped steel and recycled aggregate concrete slab are connected by studs. The replacement rate of recycled coarse aggregate(RCA)is 0%,50% and 100% respectively,and the design strength grade of concrete is C30 and C60 respectively. The shear performance of the specimens with different design parameters are compared and discussed,and the influence of design parameters on the shear performance of the specimens is analyzed. The results show that the structure of the composite beam with stud connection is reliable,and the H-shaped steel and recycled aggregate concrete slab have good joint performance. The shear performance and failure mode of composite beams with different replacement ratio of RCA are similar. The stiffness,shear capacity and deformability of specimens with high strength are improved.