局部区段锈蚀的钢筋混凝土柱承载力试验研究

Experimental Study on Load Capacity of Reinforced Concrete Columns with Partial Length Corrosion

采用外加电流对位于柱拉、压区、不同局部长度的钢筋混凝土柱内纵向钢筋进行了快速锈蚀试验.结果表明:随着钢筋锈蚀率的增加,大、小偏压锈蚀柱的承载力下降,破坏发生于沿原有锈胀裂缝或集中于原有锈胀裂缝附近;拉区局部区段内的较大锈蚀使得大偏压锈蚀柱承载力降幅较大;压区局部区段内的较大锈蚀使得小偏压锈蚀柱承载力显著下降.承载力降低的主要原因是局部锈蚀区段的存在,从而破坏了柱纵向受力的完整性.

Accelerated corrosion technique was performed on the tensile or compressive longitudinal steel of the reinforced concrete （RC） columns, where only a partial length of the longitudinal steel was corroded. Experimental study was carried out on the RC columns with different partial length corrosion in tensile or compressive zone. It is showed that the load capacity of the corroded RC column decreases with the increase of the corrosion level. The failure of the corroded column occurs in the partial length, mainly developed from or located nearby the corrosion cracks. For RC column with large eccentricity, load capacity of the column is influenced by the high corrosion level in tensile zone. For RC column with small eccentricity, load capacity of the column greatly decreases due to the highly corrosion level in compressive zone. The main cause of the great reduction of the load capacity of the RC column with partial length corrosion lies in the destruction of the longitudinally mechanical integrality of the column in the partial length.