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为研究纤维编织网增强混凝土(Textile reinforced concrete,简称TRC)加固偏心受压水工结构的抗裂性能,对6根偏压短柱进行试验,研究了配网率和前期受力对TRC控制偏心受压结构裂缝的影响,在此基础上,建立了TRC加固下的偏心受压结构的裂缝扩展理论,进一步分析了裂缝的扩展规律。研究结果表明:对于一次受力结构,以基体材料开裂、受拉钢筋屈服为界限点裂缝呈现出3个扩展阶段;对于二次受力结构,滞后应变(前期受力历史造成)小于基体材料开裂应变时,裂缝扩展以加固点、基体材料开裂和受拉钢筋屈服为界限点呈现出4个扩展阶段,而当滞后应变大于基体材料开裂应变时,裂缝扩展以加固点、受拉钢筋屈服为界限点呈现出3个扩展阶段;在扩展阶段转变处,裂缝扩展速率(偏压荷载与裂缝扩展深度的比值)突增,但是在同一阶段内裂缝扩展速率逐渐减小;采用TRC可以有效地控制偏心受压结构主裂缝的发展,配网率越高,裂缝分布越均匀,条数越多,间距和扩展速率越小;前期受力对采用TRC抑制裂缝深度扩展的影响明显,而对抑制裂缝宽度扩展的影响较轻,总体而言前期受力历史越大,效果越差。
In order to study the crack resistance of Eccentric Compression Hydraulic Structures reinforced with Textile Reinforced Concrete (TRC), six columns of bias columns were tested. The effects of distribution ration and pre-stress on the eccentricity of TRC On the basis of this, the crack propagation theory of eccentric compression structure strengthened by TRC is established, and the propagation rule of cracks is further analyzed. The results show that for the first stress structure, the base material cracks, the yield stress of the tensile reinforcement presents three stages of expansion; for the second force structure, the hysteresis strain (previous force history) is less than the base material cracking In the case of strain, the crack propagation has four stages of expansion at the points of reinforcement, cracking of the base material and yielding of the tensioned steel. When the hysteresis strain is greater than the delamination strain of the base material, the crack propagates to the point of reinforcement, Point shows three expansion stages. At the transitional stage, the crack propagation rate (the ratio of the bias load to the crack propagation depth) suddenly increases, but the crack propagation rate decreases gradually in the same stage. The use of TRC can effectively control the eccentricity With the development of the main cracks in the compression structure, the higher the distribution rate is, the more homogeneous the fractures are, the more the number of the fractures is, the smaller the spacing and the expansion rate are. The early loading has a significant effect on the TRC crack depth expansion inhibition, The impact of expansion is lighter. In general, the larger the previous history of stress, the worse the effect.