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首页> 外文期刊>Magazine of Concrete Research >Bond of high-strength concrete under monotonic pull-out loading
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Bond of high-strength concrete under monotonic pull-out loading

机译：高强度混凝土在单调拉拔荷载作用下的粘结

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An experimental investigation was conducted on high-strength concrete specimens to examine the bond strength characteristics under monotonic loading. The range of compressive strengths tested was between 70 and 95 MPa. The influences of load history, confining reinforcement, bar diameter, concrete strength, reinforcement spacing and rate of pull out were investigated experimentally. The internal concrete strains close to the contact surface and also the steel strain were measured. The test set-up, load application, instrumentation and measurement, and test procedure were designed to measure strains and deformations. Several specimens with reinforcement bar diameters of 20, 25 and 35 mm were tested. The test results revealed that the bond strength of high-strength concrete is higher than the corresponding normal strength concrete. However, the bond behaviour of high-strength concrete is more brittle in comparison with normal strength concrete. The concrete strains were measured around the steel reinforcement. Concrete strain measurements are useful to identify the internal crack pattern and to predict possible failure modes. The area under the curve of the bond stress-slip curve can define the bond energy. The bond energy is related to ductility and can be used along with the bond strength in evaluating the bond behaviour of high-strength concrete.
机译：对高强度混凝土试件进行了实验研究，以检查单调荷载下的粘结强度特性。测试的抗压强度范围在70到95 MPa之间。实验研究了载荷历程，围护钢筋，钢筋直径，混凝土强度，钢筋间距和拉拔速度的影响。测量了靠近接触表面的内部混凝土应变以及钢应变。测试设置，载荷应用，仪器和测量以及测试程序旨在测量应变和变形。测试了几个钢筋直径分别为20、25和35 mm的样品。试验结果表明，高强度混凝土的粘结强度高于相应的普通强度混凝土。但是，与普通强度混凝土相比，高强度混凝土的粘结性能更脆。在钢筋周围测量混凝土应变。混凝土应变测量可用于识别内部裂纹模式并预测可能的破坏模式。结合应力-滑动曲线的曲线下面积可以定义结合能。粘结能与延展性有关，可与粘结强度一起用于评估高强度混凝土的粘结性能。

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