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本文介绍了在实验室进行的钢筋混凝土梁的静载和循环荷载(反向荷载)试验,旨在确定合成树脂灌浆修补的能力及其效果。梁按受拉及受剪两种破坏形式设计,先试验到破坏,然后修补,再进行试验。按先单向后反向的顺序施加荷载。循环荷载的目的在于确定准入混凝土裂缝内的树脂层的效果和可能的树脂疲劳。试验结果表明,如果树脂能进入裂缝(裂缝宽度不小于0.1mm),则受损伤的梁就能恢复到损伤前的荷载—挠度关系和极限承载能力。但如果钢筋和混凝土之间的粘着力已遭到破坏,或者钢筋的拉伸已超过其弹性极限,要安全恢复原有的性能就有问题了。大量的剪切裂缝可以完全修复,在剪切破坏时,其刚度和强度,都较原来有所增强。试验结果还表明,裂缝中的树脂对修补过的梁在反向荷载作用下的性能,没有不良影响。
This article describes the static and cyclic loading (reverse loading) tests of reinforced concrete beams in laboratories to determine the ability and effect of synthetic resin grouting to repair. Beam tension and shear by two forms of damage design, the first test to damage, and then repair, and then test. The load is applied in the reverse order of the first one-way. The purpose of cyclic loading is to determine the effect of the resin layer entering the concrete crack and possible resin fatigue. Test results show that if the resin can enter the crack (the crack width of not less than 0.1mm), the damaged beam can be restored to the pre-damage load-deflection relationship and the ultimate bearing capacity. However, if the bond between steel and concrete has been damaged, or if the tensile strength of the steel has exceeded its elastic limit, there is a problem in safely restoring the original performance. A large number of shear cracks can be completely repaired, in the shear failure, the stiffness and strength are more enhanced than the original. The test results also show that the resin in the crack has no adverse effect on the performance of the repaired beam under reverse loading.