摘要
本文设计出一种新型的超高性能混凝土(UHPC)装配式电缆沟,并对其承载力和适用性进行了研究。首先对侧板的抗弯性能进行了试验研究,并将试验结果与现行三种规范的计算结果进行对比分析,结果表明基于《纤维混凝土结构技术规程》(CECS 38—2004)求得的承载力、刚度及裂缝宽度的计算值与试验值均较为接近,此规范可作为UHPC装配式电缆沟构件设计的依据。进一步研究了底板与侧板连接方式的可靠性,通过对现浇、接头设在底板采用螺栓约束、杯口节点三种连接方式构件进行试验研究,发现杯口节点试件受力后侧板变形明显,承载力仅为6.7 kN;底板螺栓连接与现浇节点试件相比,破坏截面相同,刚度略低,极限承载力相近,约为杯口节点试件的2倍,能保证UHPC装配式电缆沟的整体抗力性能。
In this paper,a new type of ultra-high performance concrete(UHPC) prefabricated cable trench was designed,and its bearing capacity and applicability were studied.The bending performance of the side plate was experimentally studied,and the test results were compared with the calculation results of the current three specifications.The results show that the calculated values of bearing capacity,stiffness and crack width based on “Technical specification for fiber reinforced concrete structures”(CECS 38—2004) are close to the experimental values.This specification can be used as the basis for the design of UHPC prefabricated cable trench components.The reliability of the connection mode between the bottom plate and the side plate was studied.Through the experimental study on the cast-in-situ,the connection mode with bolt constraint on the bottom plate and the cup joint,it is found that the deformation of the side plate of the cup joint specimen under load is obvious,and the bearing capacity is only 6.7 kN.Compared with the cast-in-situ joint specimen,the failure section of the bottom bolt connection is the same,the stiffness is slightly lower,and the ultimate bearing capacity is similar,which is about twice that of the cup joint specimen.It can ensure the overall resistance performance of UHPC prefabricated cable trench.
作者
徐港
王鑫科
盛唤
周万清
XU Gang;WANG Xinke;SHENG Huan;ZHOU Wanqing(Hubei Key Laboratory of Disaster Prevention and Mitigation,Yichang 443002,China;College of Civil Engineering&Architecture,China Three Gorges University,Yichang 443002,China)
出处
《硅酸盐通报》
CAS
北大核心
2022年第3期844-852,共9页
Bulletin of the Chinese Ceramic Society
基金
国家级地方高校能源和环境材料化学学科创新引智基地(D20015)
土木工程防灾减灾湖北省引智创新示范基地(2021EJD026)
宜昌市自然科学研究项目(A20-3-012)。
关键词
装配式电缆沟
超高性能混凝土
承载力计算
短期刚度
节点设计
破坏形态
prefabricated cable trench
ultra-high performance concrete
bearing capacity calculation
short-term rigidity
joint design
failure form
