循环荷载作用下纤维增强蒸压加气混凝土力学性能试验  

Experimental research on the mechanical properties of fiber-reinforced autoclaved aerated concrete under cyclic loading

作　　者：权文立 黄炜[1] 毛文桢 苗欣蔚 侯莉娜[3] 郝利军 QUAN Wenli;HUANG Wei;MAO Wenzhen;MIAO Xinwei;HOU Lina;HAO Lijun(School of Civil Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,China;School of Science,Xi'an University of Architecture&Technology,Xi'an 710055,China;College of Architecture Engineering,Xi'an Technological University,Xi'an 710021,China;Hanzhong Derun Environmental Protection Technology Co.,Ltd.,Hanzhong 724200,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学理学院,西安710055 [3]西安工业大学建筑工程学院,西安710021 [4]汉中德润环保科技有限公司,汉中724200

出　　处：《复合材料学报》2025年第2期1049-1060,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52378193);国家自然科学基金青年项目(52308203);西安建筑科技大学优秀博士学位论文培育基金(2023XYBPY0010);陕西省杰出青年科学基金项目(2018JC-025);陕西省科技计划项目(2021JM-435)。

摘　　要：为研究纤维增强蒸压加气混凝土(FAAC)循环受压力学行为,共设计11组棱柱体试件进行单调及循环受压试验,分析纤维种类(玄武岩纤维(BF)、碳纤维(CF))和纤维掺量对FAAC破坏形态、应力-应变全曲线特征、塑性应变、刚度退化率、应力退化率等力学性能指标的影响规律。研究结果表明:循环荷载作用下FAAC的破坏模式主要为剪切破坏和竖向劈裂破坏,随纤维掺量增加,试件破坏模式由剪切破坏转向竖向劈裂破坏;纤维掺量为0.4wt%时,FAAC的峰值应力增幅最大,BF/蒸压加气混凝土(AAC)的单调加载曲线和循环加载曲线峰值应力分别增加了24.29%、29.16%,CF/AAC的单调加载曲线和循环加载曲线峰值应力则分别增加了31.45%、37.81%;纤维掺量为0.5wt%时,FAAC的峰值应变增幅最大,BF/AAC的单调加载曲线和循环加载曲线峰值应变分别增加了28.12%、28.77%,CF/AAC的单调加载曲线和循环加载曲线峰值应变则分别增加了37.17%、41.50%;两种纤维均小幅度增加了AAC的累积塑性应变,但纤维掺量与卸载刚度及应力退化率之间未表现出明显的规律。基于试验结果,采用幂函数对FAAC标准化塑性应变与卸载点之间的关系进行拟合;提出应力退化率及加、卸载曲线双折线简化模型;最后,建立了循环荷载作用下FAAC的应力-应变曲线计算方程。In order to investigate the compressive mechanical properties of fiber-reinforced autoclaved aerated concrete(FAAC)under cyclic loading,a total of 11 sets of prismatic specimens were designed for uniaxial monotonic and cyclic compression tests.The effects of fiber types(basalt fiber(BF),carbon fiber(CF))and fiber content on the mechanical performance indicators of FAAC such as failure mode,stress-strain curve characteristics,plastic strain,stiffness degradation rate,and stress degradation rate,were analyzed.The research results indicate that the failure mode of FAAC under cyclic loading contains oblique shear failure and vertical splitting failure,and with the fiber content increasing,the failure mode of FAAC turns from shear failure to splitting failure.When the fiber content is 0.4%,the peak stresses of FAAC reach their maximum values,the peak stresses of BF/autoclaved aerated concrete(AAC)under monotonic and cyclic loading increase 24.29% and 29.16%,respectively,while that of CF/AAC increase 31.45% and 37.81%,respectively.When the fiber content is 0.5%,the peak strains of FAAC reach their maximum values,the peak strains of BF/AAC under monotonic and cyclic loading increase 28.12% and 28.77%,respectively,while that of CF/AAC increase 37.17% and 41.50%,respectively.Both BF and CF slightly improve the cumulative plastic strain of AAC,but there is no significant relationship between fiber content,unloading stiffness,and stress degradation rate.Based on the experimental results,a power function is used to fit the relationship between the standardized plastic stain and unloading strain.Simplified double line models for stress degradation rate,unloading and reloading curves are proposed.Finally,the stress-strain curve calculation equation for FAAC under cyclic loading is established.

关 键 词：蒸压加气混凝土 纤维 循环荷载 应力-应变曲线 塑性应变 计算方程 

分 类 号：TU528[建筑科学—建筑技术科学] TB332[一般工业技术—材料科学与工程]