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目的研究钢筋在砂浆中的粘结锚固机理及钢筋内力沿锚固长度的变化,确定钢筋在混凝土多孔砖水平灰缝中的锚固长度.方法通过对17个试件51根钢筋的拉拔试验,采用改变其中一个参数而固定其余参数的方法,研究分析钢筋直径、竖向正应力、砂浆强度、钢筋埋置长度等因素对试验结果的影响.结果随着正应力的增加界限锚固长度逐渐变短,当正应力为零时界限锚固长度最长,其值为390 mm,由此可建议在实际工程中钢筋在砂浆的锚固长度可取400 mm.结论混凝土多孔砖砌体水平灰缝钢筋的粘结强度比实心黏土砖的有较大下降,验证了现行规范中关于砌体钢筋锚固长度已不适合于混凝土多孔砖砌体.
Aim To study the bonding and anchoring mechanism of rebar in mortar and the variation of internal force of rebar along the length of anchorage to determine the anchorage length of rebar in horizontal grout of concrete perforated bricks.Methods The tensile tests of 51 rebar Changing one of the parameters and fixing the remaining parameters, the influence of the factors such as the diameter of reinforcement, the vertical normal stress, the strength of mortar and the embedded length of reinforcing steel on the test results was studied.Results With the increase of normal stress, the anchoring length became shorter, When the normal stress is zero, the limit anchoring length is the longest and the value is 390 mm, so it can be suggested that the actual anchorage length of reinforcing steel in mortar should be 400 mm.Conclusion The bond strength of horizontal grout reinforcement in concrete perforated brick masonry Which is larger than that of solid clay brick. It is verified that the anchoring length of masonry reinforced concrete is not suitable for concrete porous brick masonry in current codes.