纤维编织网增强自应力混凝土梁的弯曲性能

Flexural Performance of Textile Reinforced Self-Stressing Concrete Beam

根据ASTMC1018—97规范对纤维网增强自应力混凝土梁的弯曲韧性进行了试验研究,得到了以不同混凝土基体和纤维束Tex含量为影响因素的荷载-挠度曲线.试验表明纤维网的加入以及Tex含量增加可以显著提高自应力混凝土梁的开裂荷载,但此时弯曲韧性指数I5,I10和I20随着开裂荷载的提升逐渐减小.同时建立了纤维编织网增强自应力混凝土这种复合材料受弯时开裂荷载的计算模型,并进行了有限元模拟,理论值、数值模拟结果和试验值吻合较好,表明该计算模型可以用来评价TRSSC梁受弯时的抗裂性能.

According to ASTMC1018—97 the test was carried out to study the flexural toughness of textile reinforced self-stressing concrete（ TRSSC） beam. The load-deflection curves were obtained,which are affected by the different kinds of matrix and the content of Tex in fibrous bundle. The results showthat the cracking load of self-stressing concrete beams is improved markedly owing to the textile and increase of Tex. However,with the increase cracking load,the flexural toughness index I5,I10 and I20of TRSSC decreased gradually. Meanwhile,a theoretical model of determining the cracking load was established and a computer analysis was given in this paper. The calculation results are in agreement with the experimental results,which indicates that the theoretical model can evaluate the crack resistance of TRSSC beam.