混杂合成纤维混凝土单轴抗拉力学特性与本构关系  

Uniaxial Tensile Properties and Constitutive Relation of Hybrid Synthetic Fiber Reinforced Concrete

作　　者：赵华[1,2] 何锐[3,4] 彭挺[1] 陈华鑫[3,4] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,西安710064 [2]江西省交通科学研究院,南昌330038 [3]长安大学材料科学与工程学院,西安710061 [4]长安大学交通铺面材料教育部工程研究中心,西安710061

出　　处：《硅酸盐通报》2015年第3期770-775,共6页Bulletin of the Chinese Ceramic Society

基　　金：教育部高等学校博士点基金项目(20130205110013);中国博士后科学基金项目(2014M552397);长安大学中央高校基本科研业务费专项资金(2013G3312018;2014G1311081);浙江省交通运输厅科研计划项目(2014H38)

摘　　要：根据混杂纤维增强原理,采用高弹模聚乙烯纤维和低弹模聚丙烯粗合成纤维制备出具有优异变形性能的混杂纤维混凝土,采用单轴拉伸试验对其单轴受力特性进行了分析,并根据测试结果建立了单轴抗拉本构关系模型。结果表明,单轴受拉应力-应变曲线可以划分为弹性阶段、应变硬化阶段和破坏阶段三个阶段;在受拉过程中出现了多缝开裂现象,微细裂缝的扩展较为曲折,在开裂过程中吸收了大量的能量,导致变形能力大幅提升;掺入硅灰后使得界面过渡区性能改善,从而导致极限抗拉强度和拉应变的增大;纤维掺量过大时不能均匀分散,结团现象出现,极限拉应变反而下降;所建立的单轴受拉分段本构关系模型能够较好的反映应力-应变曲线的发展趋势,所推荐的模型参数计算公式具有较高的准确性。Hybrid fiber reinforced concrete with excellent deformation performance was produced with the adoption of high modulus polyethylene fiber and low elastic modulus polypropylene synthetic fiber according to the enhancement principle of hybrid fiber. The uniaxial tensile properties of hybrid fiber reinforced concrete were analyzed on the basis of uniaxial tensile test, and the constitutive relation model under uniaxial tension was established. The results showed that the stress-strain curves under uniaxial tension can be divided into three stages, elastic stage, strain hardening stage and failure stage. Multiple cracks appear during the loading process. The winding micro-cracks absorb a large amount of energy in the process of cracking, leading to the high improvement of deformation capability. The addition of silica fume enhances the performance of interface transition zone, and leads to the increase of ultimate tensile strength and tensile strain. The fiber cannot be evenly dispersed and the cluster phenomenon appears when the content is too large. So the ultimate tensile strain declines. The established constitutive relation model under uniaxial tension can reflect the development trend of stress-strain curve reasonably, and the recommended calculation formula of model parameter possesses high accuracy.

关 键 词：纤维混凝土 单轴受拉 力学特性 本构关系 

分 类 号：TU528[建筑科学—建筑技术科学]