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钢筋混凝土结构通常承受使用荷载且带裂缝工作,持续荷载和裂缝对钢筋混凝土结构滞回性能影响的情况尚不清楚。通过对养护28 d后的钢筋混凝土柱施加不同比例的大偏心受压持续荷载,在大气环境下养护100 d(总计128 d),卸掉持续荷载,进行低周期反复加载试验,以探讨持续荷载和裂缝对滞回性能的影响。结果表明,当持续荷载与低周反复荷载产生的应力分布一致时,钢筋混凝土柱的初始加载刚度、极限荷载和延性随持续荷载增大而降低;反之,极限荷载随持续荷载增大而降低,初始加载刚度和延性随持续荷载增大呈增大的趋势,但不够显著。说明持续荷载对钢筋混凝土柱的滞回性能有一定影响。
Reinforced concrete structures are usually subjected to load with cracks, and the effect of sustained loads and cracks on the hysteretic behavior of reinforced concrete structures is not clear. By applying a large eccentric compression sustained load with different proportions to the reinforced concrete columns after curing for 28 days, the specimens were maintained in the atmosphere for 100 days (totaling 128 days), and the sustained loads were removed and the low-cycle repeated loading tests were conducted to investigate the effects of the sustained loads And crack on hysteretic performance. The results show that the initial load stiffness, ultimate load and ductility of reinforced concrete columns decrease with the increase of continuous loads, while the ultimate loads decrease with the increase of sustained loads, The initial load stiffness and ductility tend to increase with increasing continuous load, but not significant enough. It indicates that the sustained load has some influence on the hysteretic behavior of reinforced concrete columns.