全轻纤维混凝土的增强增韧与耗能效果分析  

Analysis on Reinforcing and Toughening and Energy Consumption Effects of All Lightweight Fiber Reinforced Concrete

作　　者：杨健辉[1,2] 吕芹[1,2] 叶亚齐[1,2] 张涵[3] 

机构地区：[1]河南理工大学生态建筑与环境构建河南省工程实验室,焦作454000 [2]河南理工大学土木工程学院,焦作454000 [3]郑州大学土木工程学院,450002

出　　处：《混凝土与水泥制品》2016年第6期50-54,共5页China Concrete and Cement Products

基　　金：国家自然科学基金资助项目(41172317)

摘　　要：为了改善全轻混凝土低强度、脆性和韧性差等缺陷,对几种纤维单掺与混掺时的效果进行了分析。结果表明,各种全轻纤维混凝土的增强系数均大于1,比强度、弹性模量和泊松比也均大于基体混凝土,且破坏形态由脆性转变为塑性,从而证明了全轻纤维混凝土的轻质、高强、高韧性特性。通过基于应力-应变曲线的耗能分析发现,各种纤维均能提高峰值特征量,以及均能使下降段更平缓、更长,从而证明其具有更高的耗能水平;但纤维种类与掺入方式不同,对峰前、峰后和总体韧性的影响程度均不同,以峰后韧性影响为最大,这为相关试验研究与工程设计提供了分析依据。In order to improve such defects of all-lightweight concrete （ALWC） as lower strength and brittleness and worse toughness, the effects on single mixed and mixed with fibers are analyzed. The results show that, the reinforcement coefficients of ALWC are greater than 1, specific strength, elastic modulus and Poisson＇s ratio are all bigger than matrix concrete, the failure modes are changed from plasticity to brittleness, which proves the all-lightweight fiber reinforced concrete （ALWFRC） has lower weight, higher strength and high toughness, the energy consumption is analyzed by stress-strain curve, which all kinds of fiber can improve peak characteristics, and make the decline curve more gently and longer, so ALWFRC has a higher energy consumption level. The influence degree of pre-peak, post-peak and total toughness are different by fiber types and adding method, the effects on toughness of post-peak is biggest, which can be used a basis for relevant experiment and engineering design.

关 键 词：全轻纤维混凝土 增强系数 韧性 应力-应变曲线 耗能效应 

分 类 号：TU528.2[建筑科学—建筑技术科学]