自密实纤维细石混凝土连续板的力学性能试验研究

Experimental study on mechanical performance of self-compacting fiber fine stone concrete continuous slabs

以杭州市某快速路高架桥梁连续板结构为原型,进行了9块桥面连续板比例模型的三点弯曲试验研究。试件的部分区域采用纤维细石高强混凝土代替普通混凝土,以配筋率和纤维细石高强混凝土替代宽度为参数,对连续板的起裂荷载、承载力、变形、钢筋应变、中和轴高度等力学特性进行了研究。结果表明,相同配筋率条件下,纤维细石高强混凝土的替换可一定程度控制裂缝的扩展,提升试件的延性,且与普通混凝土界面黏结良好,协调变形。

Based on the continuous slab structure of the fast road bridge in Hangzhou,it carried out the three-point bending tests of 9 continuous plate scale specimens.In some parts of the specimen,high-strength fiber fine stone concrete was used instead of ordinary concrete.Taking reinforcement ratio and fiber fine stone high-strength concrete replacement width as parameters,the mechanical properties of continuous plate cracking load,bearing capacity,deformation,steel strain and neutral axis height were studied.The results show that under the same reinforcement ratio,the replacement of fiber fine stone high-strength concrete can control the expansion of crack to a certain extent,improve the ductility of the specimen,and bond well with the common concrete interface and coordinate.