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CFRP筋粘结式锚具锚固性能试验

, PP. 68-77

Keywords: 桥梁工程,CFRP筋,静载试验,粘结式锚具,活性粉末混凝土

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Abstract:

?针对碳纤维增强塑料(CFRP)作为预应力筋或拉索时出现的锚固问题,开发了一种以活性粉末混凝土(RPC)作为粘结介质的粘结式锚具。建立了平均粘结强度及其对应的滑移量、临界锚固长度以及粘结滑移本构模型等计算公式。通过静载试验研究了筋材表面形状、锚固长度、根数、间距、套筒内壁倾角以及筋材预张拉等对锚固性能的影响。结果表明:CFRP筋的表面形状对以RPC作为粘结介质的粘结式锚具的锚固性能有着决定性影响;当表面压纹CFRP筋的抗拉强度不大于3000MPa,RPC抗压强度不小于130MPa时,对于普通粘结试件,临界锚固长度为20倍筋材直径;对于预张拉粘结试件,当预张比为56%时,锚固系统具有最短的临界锚固长度为13倍筋材直径;多筋同时锚固时,其间距不宜小于1倍筋材直径。

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