论文部分内容阅读
采用四点弯曲加载的方式研究冻融循环作用下冻融循环次数、纤维编织网增强混凝土(TRC)黏结剂、TRC型式和弯曲应力水平等因素对TRC加固梁性能的影响。结果表明:冻融次数越多,承载力下降幅度越大,梁越容易发生剪切破坏;用细粒混凝土将预制TRC板粘贴到梁底,在限制裂缝、承载力及挠度变形方面所表现出来的性能与现浇TRC加固很接近,而用结构胶粘结预制TRC板在各方面性能的表现不甚理想;弯曲应力水平越大,试验梁经过冻融循环的极限承载力下降越多,梁的变形越大。冻融循环对TRC加固梁有较大影响,使得梁的破坏模式、极限承载力和挠度有所改变,但在整个试验过程中,TRC对梁的加固保持较好的作用,使梁的裂缝发展得到了较好的控制。
The effect of freeze-thaw cycles, the effect of fiber braided wire reinforced concrete (TRC) binder, TRC type and bending stress on the properties of TRC strengthened beams were investigated by four-point bending loading. The results show that the more the number of freeze-thaw cycles, the greater the decrease of bearing capacity is, the more prone to shearing failure of the beam. The prefabricated TRC board is attached to the bottom of the beam with fine-grained concrete, which is shown in the aspects of limiting cracks, bearing capacity and deflection Performance is very close to that of cast-in-situ (TRC) reinforcement, while the performance of pre-fabricated TRC sheets bonded with structural adhesive is not satisfactory. The greater the bending stress, the more the ultimate bearing capacity of the test beam decreases after freeze-thaw cycles. The larger the deformation. The freeze-thaw cycle has a great influence on the TRC reinforcement beam, which makes the failure mode, ultimate bearing capacity and deflection of the beam change. However, during the whole experiment, the TRC maintains a good effect on the reinforcement of the beam, Got better control.