砌块专用砂浆与钢筋黏结性能试验研究

通过12组试件的拉拔试验,建立黏结应力与滑移(τ S)关系曲线,确定了锚固钢筋受力破坏的各个阶段(微滑移、内裂滑移、劈裂、下降和残余五个阶段),综合分析了砂浆强度、锚固长度和钢筋直径对黏结锚固性能的影响·试验结果表明:在给定的l/d的条件下,黏结强度随砂浆强度增加而提高,随相对锚固长度和钢筋直径的增大而降低·最后,考虑砂浆的劈拉强度和相对锚长,利用最小二乘法,通过统计回归提出了黏结特征强度的统计公式·

Tests and Reseach on Behaviour of Reinforced Bond in Reinforced Block Masonry

Based on the results of 12 sets of pull-out tests of mortar specimens, the relationship between bond stress and slip is obtained to determine each and every phase of the failure process of anchoring bars,including microslip,crack-oriented slip,splitting,slip reducing and residual slip. The effects of mortar strength, anchorage length and bar diameter on the performance of the reinforced bond specially used in the tests are discussed. Testing results indicated that, under the condition the ratio l/d is given, the bond strength increases with mortar strength, and decreases with increasing anchorage length/bar diameter. In view of the pull-out splitting strength of the mortar used and relative anchorage length, the least square method is used in combination with statistical regression to give a formula characterizing the bond strength.