蒸压加气混凝土砌块砌体水平灰缝钢筋锚固试验

摘要

目的 研究钢筋在不同砂浆中的粘结锚固机理及钢筋应力沿锚固长度方向的变化,确定钢筋在蒸压加气混凝土砌块砌体水平灰缝中的锚固长度.方法 通过蒸压加气混凝土砌块砌体水平灰缝钢筋锚固试验,对11个试件44根钢筋进行拉拔试验,分析钢筋直径、截面正应力、砌筑砂浆强度等级及截面刻槽等因素对钢筋锚固的影响.结果 在实际工程中,加气混凝土砌块在采用专用砂浆砌筑截面有刻槽、专用砂浆无刻槽、普通砂浆有刻槽三类形式构件时,砌体水平灰缝中钢筋锚固长度可分别取400 mm、460 mm、490 mm,具有一定安全储备.结论 不同类型试件对构件粘结力的影响存在很大差别,砂浆强度对粘结力具有显著影响.%This paper studies the bond anchorage mechanism of reinforcement bar in mortar and the changes of reinforced internal force along the anchor length and determine the anchor length of reinforced in concrete porous brick level crack monotomic ash. Towards the 11 specimens 44 reinforcing steel bar pull out tests were analyzed on the basis of reinforced diameter,section normal stress,laying mortar strength level and other factors on the section groove reinforced the anchoring effect. Reinforced in proposed autoclaved aerated concrete block masonry horizontal gray crack in the suggestion anchor length. To prevent the occurrence of mortar and block the bond between destruction to groove section depth for 400 mm、460 mm 、490 mm. In practical projects need minimum groove section depth 20mm,have certain take safety stock.