混杂钢纤维混凝土铺装层增强梁顶抗裂性试验研究  

Experimental Study on Enhancing Crack Resistance of Beam Top with Hybrid Steel Fiber Concrete Pavement Layer

作　　者：雷杨崑 周志祥[1] 魏文龙[1] LEI Yangkun;ZHOU Zhixiang;WEI Wenlong(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074

出　　处：《施工技术》2018年第21期56-60,117,共6页Construction Technology

基　　金：国家自然科学基金青年基金项目:基于桥面形态变化的桥梁安全状态监测方法与预警理论研究(51708068);国家自然科学基金面上项目:影像轮廓线叠差分析获取桥梁全息变形及结构状态演绎方法研究(51778094)

摘　　要：针对混凝土连续梁负弯矩区段拉应力过大问题,提出了一种能有效提高抗裂能力和阻止裂缝发展的混杂钢纤维混凝土结构。钢筋混凝土工形梁加载试验破坏后,在此基础上进行了修复处理,设计制作3片高掺量混杂钢纤维混凝土铺装层结构受弯构件,并设置普通混凝土铺装层做对比。试验结果表明:高掺量混杂钢纤维混凝土铺装层能够有效提高构件自身开裂弯矩,显著改善梁体抗裂性能,减小裂缝开展宽度。依据变形协调和静力平衡条件建立了加固工形梁的开裂弯矩计算模式,研究了用高掺量混杂钢纤维混凝土铺装层工形梁的开裂机理。For the problem of excessive tensile stress in the concrete continuous beam negative bending section, this paper proposes a hybrid steel fiber reinforced concrete structure which can effectively improve anti-cracking ability and prevent the fracture development. After the reinforced concrete beam destruction, through repairing the beam, it designs three flexural members of high content hybrid steel fiber concrete pavement structure, and contrasts the common concrete pavement. Experimental results show that high content hybrid steel fiber concrete pavement can effectively improve the cracking moment of flexural member, and improve anti-cracking performance of beam body, decrease the crack width. According to the deformation coordination and static equilibrium conditions, this paper establishes the crack bending moment calculation model, and researches the mechanism of beam with high content of steel fiber concrete pavement.

关 键 词：混凝土 混杂钢纤维 开裂 抗裂性能 试验 研究 

分 类 号：U443.33[建筑科学—桥梁与隧道工程]