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通过对1榀转换梁下部1根碳纤维复材筋施加预应力的框支转换梁结构进行拟静力试验,分析部分预应力混合配筋框支转换梁结构在竖向和水平荷载作用下的裂缝发展规律、筋材应变规律,研究试件的承载能力、延性和滞回曲线等抗震性能。试验结果表明:对转换梁施加预应力能够有效抑制转换梁在跨中区域裂缝开展,使试件有较高的承载力;试件延性系数大于3,强屈比达到1.31以及滞回曲线较为丰满,说明部分预应力混合配筋框支转换梁结构具有较好的延性和抗震性能。
The quasi-static test was carried out on the box-girder conversion beam prestressed with one carbon fiber reinforced composite bar under the 1 榀 conversion beam, and the fractures under the vertical and horizontal loads were analyzed The law of development, the law of tendon strain, the bearing capacity of specimens, ductility and hysteresis curves and other seismic performance. The test results show that the prestressing of the conversion beam can effectively restrain the conversion beam from cracking in the midspan region and make the specimen have a higher bearing capacity; the ductility coefficient of the specimen is greater than 3, the flexural yield ratio reaches 1.31 and the hysteresis curve is relatively full , Which shows that the structure of partially converted prestressed mixed frame-supported beam has good ductility and seismic performance.