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不同加载速率下钢筋与混凝土间粘结性能试验

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Keywords: 桥梁工程,钢筋混凝土,偏心拉拔试验,粘结性能,加载速率

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Abstract:

?为探索不同加载速率下变形钢筋和混凝土之间的粘结性能,通过37个试件的偏心拉拔试验,实时采集加载过程中的粘结-滑移关系数据,分析了加载速率、保护层厚度、钢筋位置、箍筋和粘结长度等因素对破坏形态、粘结强度及相对滑移的影响。研究结果表明:随着加载速率的增大,混凝土抗拉强度提高且混凝土径向裂缝发展滞后,试件由混凝土劈裂破坏向钢筋拔出破坏转变,劈裂破坏试件的粘结强度提高;在相同加载速率下,随着保护层厚度的增大,试件也会由混凝土劈裂破坏向钢筋拔出破坏转变;箍筋的配置对破坏形态影响不大,但能提高粘结强度,减小峰值滑移量。

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