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通过对不同龄期新浇筑混凝土柱施加不同地震加速度作用的试验,以模拟新浇筑钢筋混凝土结构构件受地震作用后的影响。研究发现,处于早龄期的混凝土柱在地震作用下产生自上而下的水平裂缝,裂缝位置在柱箍筋位置附近,且越接近柱端,裂缝越宽。龄期在48h以后的混凝土柱在受到地震扰动下,柱身和柱根均未见明显水平裂缝。通过超声波探伤表明,内部损伤与外观裂缝具有紧密的联系,龄期越短,内部损伤越为严重,且越靠近柱根,内部损伤越明显。
Through the experiment of applying different earthquake accelerations to the newly poured concrete columns of different ages, the influence of post-earthquake on the components of the newly poured RC structure is simulated. It is found that the concrete column in its early age produces horizontal fractures from top to bottom under the earthquake. The crack location is near the location of the column stirrups. The closer to the column ends, the wider the fractures. Concrete columns aged 48h later under seismic disturbance did not see obvious horizontal cracks in the column and the column. Ultrasonic flaw detection showed that the internal damage and the appearance of cracks are closely linked, the shorter the age, the more serious internal damage, and the more close to the column root, the more obvious internal damage.