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为研究冷轧带肋钢筋焊接网混凝土板的抗弯性能,通过拉伸试验,获得了CRB600H与CRB550冷轧带肋钢筋的力学性能指标;进行了32块冷轧带肋钢筋焊接网混凝土板的受弯性能试验,测定了试验板的开裂弯矩、裂缝分布情况、变形发展规律和正截面承载力.研究结果表明:焊点未对CRB600H与CRB550冷轧带肋钢筋的力学性能产生影响;横向钢筋对试验板的开裂弯矩、裂缝间距和裂缝宽度无明显影响.建立了这类板的短期刚度计算公式,与普通混凝土板相比,这类板的抗弯刚度高约10%.根据配置CRB600H和CRB550钢筋网试验板的破坏模式,提出了这两种板正截面承载力的计算方法.
In order to study the flexural behavior of cold-rolled ribbed steel bar welded square concrete slab, mechanical properties of CRB600H and CRB550 cold-rolled ribbed bar were obtained through tensile test. 32 cold-rolled ribbed steel bars welded slab concrete slab Flexural strength test, the crack initiation moment, crack distribution, deformation and regularity of the test plate were measured.The results show that the welding point has no effect on the mechanical properties of CRB600H and CRB550 cold-rolled ribbed bar; The crack moment, crack spacing and crack width have no significant effect on the test plate.The short-term stiffness of this kind of plate is calculated, which is about 10% higher than the ordinary concrete plate.According to the CRB600H And the failure mode of the CRB550 steel mesh test board, the calculation method of the bearing capacity of the normal cross section of the two kinds of boards is proposed.