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钢筋混凝土T梁疲劳性能试验研究

, PP. 53-58

Keywords: 桥梁工程,损伤规律,疲劳试验,钢筋混凝土,T梁,S-N曲线

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Abstract:

为了获取钢筋混凝土T梁的疲劳损伤发展规律,在实验室对5片试验梁进行了等幅疲劳加载试验研究。试验梁呈现出明显的疲劳损伤3阶段规律疲劳试验前期和后期损伤发展均较快,但疲劳试验中期损伤发展相对稳定。疲劳损伤破坏为钢筋突然的脆性破坏。裂缝数目、宽度及高度发展可划分为快速发展、稳定和破坏3个阶段。接近疲劳破坏时除一至两条主裂缝继续扩展外其余裂缝停止增长并逐渐闭合,最终在主裂缝处疲劳断裂。试验梁的挠度发展、钢筋与混凝土的应变发展增量在疲劳循环初期时增长比较显著,随着疲劳荷载循环次数的增加,增长速率趋缓而进入相对稳定的发展阶段;临近破坏时又发生了较大幅度的增长。得到了钢筋混凝土T梁的S-N曲线。

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