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利用MTS电液伺服试验系统对钢筋混凝土梁进行不同加载速率下的力学性能试验,采用位移控制的单调加载方式,加载速率分别为0.1 mm/s、0.5 mm/s、1.0 mm/s、5.0 mm/s和10.0 mm/s,研究加载速率对钢筋混凝土梁力学性能的影响,分析加载速率对钢筋混凝土梁破坏形式、荷载-变形曲线的影响,及加载速率对钢筋混凝土梁的开裂、极限、破坏荷载,开裂、极限、破坏位移以及延性和耗能能力的影响。结果表明:随着加载速率的提高,钢筋混凝土梁的裂纹分布更加均匀,且宽度逐渐减小;钢筋混凝土梁的开裂、极限、破坏荷载,开裂、屈服、极限位移和位移延性系数都随着加载速率的增加明显增大;随着加载速率的增加,钢筋混凝土梁的耗能能力得到显著提高。
The mechanical properties of RC beams under different loading rates were tested by MTS electro-hydraulic servo test system. The displacement was controlled by a monotonic loading method at loading rates of 0.1 mm / s, 0.5 mm / s, 1.0 mm / s and 5.0 mm / s and 10.0 mm / s, the influence of loading rate on the mechanical properties of reinforced concrete beams was studied. The influence of loading rate on the failure modes and load-deformation curves of reinforced concrete beams and the cracking, Load, cracking, limit, damage displacement and ductility and energy consumption. The results show that the crack distribution of RC beams is more uniform and the width decreases with the increase of loading rate. The cracking, ultimate strength, failure load, cracking, yield, ultimate displacement and displacement ductility of reinforced concrete beams are both dependent on the loading The rate of increase significantly increased; with the increase of loading rate, the energy consumption of reinforced concrete beams have been significantly improved.