破损大型屋面板受弯承载力试验研究

Experimental Study on Bending Capacity of Large-size Ribbed Roof Slabs in Disrepair

破损构件承载力计算是钢筋混凝土结构耐久性评估的关键问题。对6块从工业厂房中拆卸的大型屋面板进行试验研究,试验和理论分析结果表明,构件破损程度对板的承载力有明显影响,锈蚀钢筋的力学性能退化及由此引起的钢筋和混凝土之间粘结性能的退化是承载力下降的内在原因。立足于现行规范的承载力计算公式,提出了破损屋面板受弯承载力计算模型。

Calculation of bearing capacity of members in disrepair is the key of evaluating the durability of reinforced concrete structures. Six large-size ribbed roof slabs in disrepair are tested. The experiment and rational analysis results show that, the damage of members has effect on the bearing capacity of slabs, and the deterioration of mechanical properties of corroded reinforcement and bond behavior with concrete result in the reduction of capacity. Based on the formulas of bearing capacity of the code, the calculating model of bending capacity of roof slabs in disrepair is proposed.