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[提要]  通過(guò)對(duì)72根冷拔螺旋肋鋼筋拔出試驗(yàn)的研究，分析了冷拔螺旋肋鋼筋的粘結(jié)錨固特點(diǎn)和各主要因素對(duì)平均粘結(jié)強(qiáng)度的影響，回歸了平均粘結(jié)強(qiáng)度的計(jì)算公式，推導(dǎo)了在拉拔狀態(tài)下臨界錨固長(zhǎng)度的計(jì)算公式，并給出了在各種情況下的臨界錨固長(zhǎng)度值。
[關(guān)鍵詞]  冷拔螺旋肋鋼筋  粘結(jié)錨固

Based on the results of pull-out test of 72 cold-draw spiral bars, the bond and anchor property between the bar and concrete and the factor such as the tensile strength of concrete, the thickness of relative protective layer and the relative anchoring length that influence the average bond strength are discussed in detail. The formulas to calculate the average bond strength and the minlmum anchoring length and the value of minimum anchoring length are given.
Keywords:  cold-draw spira! bar; bond; anchor; property