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为研究埋入深度与基材密度对钢丝拔出力的影响,试验制备3种不同容重泡沫混凝土,将3种埋入深度的镀锌钢丝垂直埋置在3种基材中.养护7 d,进行钢丝从泡沫混凝土中拔出试验,得到拔出力与拔出位移的关系曲线.结果分析表明:同容重等级泡沫混凝土,钢丝埋入深度越长,拔出力越大,拔出位移也越大;相同埋入深度下,泡沫混凝土容重等级越大,钢丝拔出力也越大,拔出位移也越大.为模拟钢丝拔出行为,基于试验数据建立了钢丝从泡沫混凝土中拔出的3阶段模型,模型计算结果与实测试验结果吻合良好.用该模型可模拟不同埋入深度的钢丝从不同容重的泡沫混凝土中拔出行为.基于模型计算,得到不同容重泡沫混凝土钢丝拔出力峰值与埋深的对应关系,以及钢丝数量与所能提供粘结强度的对应关系.
In order to study the effect of embedment depth and substrate density on the pull-out force of steel wire, three kinds of foam concrete with different bulk density were prepared and buried in three kinds of substrates with three kinds of buried depth galvanized steel wires. The results show that: with the same weight heavy grade foam concrete, the longer the wire buried depth, the greater the pull-out force, the more the pull-out displacement In the same depth of embedment, the greater the bulk density of foam concrete, the larger the pull-out force of steel wire and the larger the pull-out displacement. To simulate the pull-out behavior of steel wire, the steel wire drawn from the foam concrete was established based on the experimental data The phase model and the model calculation results are in good agreement with the experimental results.The model can simulate the pull-out behavior of steel wires with different embedment depth from foam concrete with different bulk density.Based on the model calculation, The corresponding relationship between the buried depth, as well as the corresponding relationship between the number of wires and the bond strength that can be provided.