废弃纤维再生混凝土受弯构件裂缝宽度计算方法  

Calculation Method for Crack Width of Waste FiberRecycled Concrete Flexural Components

作　　者：周静海[1,2] 赵冰野 梁意博 康天蓓[1] ZHOU Jinghai;ZHAO Bingye;LIANG Yibo;KANG Tianbei(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Green and Livable Rural Construction Institute,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]沈阳建筑大学绿色宜居乡村建设研究院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2023年第5期790-799,共10页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金青年项目(52108235);辽宁省教育厅高等学校创新团队(LT2019011)。

摘　　要：目的 提出废弃纤维再生混凝土受弯构件的裂缝宽度计算方法,为废弃纤维再生混凝土受弯构件的设计和工程应用提供参考。方法 对4根废弃纤维再生混凝土梁进行正截面受弯静力加载试验,分析试验梁的裂缝发展过程和分布规律。评估不同规范中废弃纤维再生混凝土受弯构件裂缝宽度计算方法的适用性,在现有规范基础上对计算公式进行修正。结果 随着再生骨料取代率的增加,梁构件主裂缝的宽度增加,适量地掺入废弃纤维可以抑制次生裂缝的产生。将不同规范中裂缝宽度计算值与试验值对比,采用中国规范计算的平均偏差最小,而采用欧洲规范计算的平均偏差最大。结论 利用笔者推导得出的公式计算得到的裂缝宽度计算值与试验值的平均偏差值为0.04 mm,该公式适用于废弃纤维再生混凝土受弯构件的裂缝宽度计算。The method for calculating the crack width of waste fiber recycled concrete flexural components was proposed to provide a reference for the design and engineering application of waste fiber recycled concrete flexural components.On four waste fiber recycled concrete beams,cross-section bending static loading tests were performed,and the crack development process and distribution law of the test beams were investigated.By assessing the suitability for the calculation method of the crack width of the flexural components for waste fiber recycled concrete in different codes,the calculation equations were revised based on the existing codes.The primary crack width of the beam components expanded as the recycled aggregate replacement rate increased,and secondary cracks could be prevented by using the appropriate amount of waste fibers.Comparing the calculated values of the crack widths in the different codes with the test values,the smallest average deviations were calculated using the Chinese code,while the largest average deviations were calculated using the European code.The average deviation between the calculated and tested crack widths using the formula derived by the author is 0.04 mm,which is applicable to the calculation of the crack width of flexural components of waste fiber recycled concrete.

关 键 词：废弃纤维 再生混凝土 受弯构件 裂缝宽度 

分 类 号：TU318[建筑科学—结构工程]