离心成型的粗骨料UHPC输电杆受弯性能试验  

Bending performance test of UHPC transmission pole with coarse aggregate formed by centrifugation

作　　者：黄福云[1] 桂奎 陆志军 马宇 黄伟 HUANG Fuyun;GUI Kui;LU Zhijun;MA Yu;HUANG Wei(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;Fujian Ruisen Cement Products Development Co.,Ltd.,Zhangping 364400,Fujian,China)

机构地区：[1]福州大学土木工程学院,福州350108 [2]福建瑞森水泥制品发展有限公司,福建漳平364400

出　　处：《哈尔滨工业大学学报》2023年第7期107-116,共10页Journal of Harbin Institute of Technology

基　　金：福建省高校优秀人才支持计划项目(G50011504);福州市科技局产学研项目(2018-G-63)。

摘　　要：为改善普通混凝土电杆自重大、杆身易开裂、承载力低等问题,基于离心成型工艺,调整离心速度、加速度和时间,设计了粗骨料UHPC最优配合比,通过变速离心机制作了6根含粗骨料的UHPC环形电杆,进一步提高了生产效率,采用四点弯曲静力加载,并以钢纤维掺量和配筋率为参数,研究其破坏模式、抗裂性能和承载能力。试验结果表明:电杆破坏方式可分为弹性、裂缝开展和破坏3个阶段;随着钢纤维掺量增加,电杆的主裂缝数量逐渐降低,而细微次裂缝逐渐增多,钢纤维在一定程度上阻碍了裂缝的发展,其受弯承载力提高了42.6%;随着配筋率的增大,电杆的主裂缝数量相差不大,但裂缝长度和宽度明显减小,且抵抗变形能力增强,其受弯承载力提高了63.8%;采用活性粉末混凝土电杆受弯承载力计算方法与试验值较为接近,但相对安全保守,不过随着配筋率和钢纤维掺量的提高,其理论计算值与试验值也越接近。To resolve the problem of heavy self-weight,easy cracking and low load-bearing capacity of ordinary concrete poles,on the basis of centrifugal molding process,the optimal mix ratio of coarse aggregate UHPC was designed by adjusting the centrifugal speed,acceleration and time.Six UHPC annular poles with coarse aggregate were made by variable speed centrifuge,thus enhancing the production efficiency.The failure mode,crack resistance and bearing capacity were investigated by four-point bending static loading with steel fiber content and reinforcement ratio as parameters.The test results show that the failure mode of the pole can be divided into three stages:elasticity,crack development and failure.With the increase of steel fiber content,the number of main cracks of the pole gradually decreases,while the number of minor cracks increases accordingly.Steel fiber hindered the development of cracks to a certain extent,and its flexural capacity increased by 42.6%.With the increase of reinforcement ratio,the number of main cracks of the pole is not much different,but the length and width of the cracks are obviously reduced.The resistance to deformation is strengthened,and the flexural bearing capacity is increased by 63.8%.The calculation results of flexural bearing capacity of RPC pole is close to the experimental value,but relatively safe and conservative.However,with the increase of reinforcement ratio and steel fiber content,the theoretical calculation value is closer to the experimental value.The calculation method of the flexural bearing capacity of the activated powder concrete pole is similar to that of the test results.

关 键 词：离心成型 粗骨料UHPC 输电杆 受弯性能 钢纤维 配筋率 

分 类 号：TU528.31[建筑科学—建筑技术科学]