活性粉末混凝土预制管组合柱抗震性能试验研究
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TU398

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国家重点研发计划(2018YFC0705400);国家自然科学基金(51678228)


Experimental research on seismic behavior of concrete-filled reactive powder concrete tube
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    摘要:

    活性粉末混凝土预制管组合柱(Concrete-filled RPC tube,简称CFRT)将活性粉末混凝土(Reactive Powder Concrete,简称RPC)的力学性能和箍筋的约束效应有效结合了起来,是一种基于超高性能水泥基套管的新型约束组合柱。对4个CFRT柱和1个箍筋约束混凝土柱开展了恒定轴力下的低周反复荷载试验,获取了组合柱的破坏形态、滞回曲线和钢筋的应变等数据,并对相关抗震指标及试验参数进行了分析。结果表明:CFRT柱在低周反复荷载作用下表现出典型的弯曲破坏特征,在RPC管表面出现大量细而密的裂缝,但没有明显的剥落现象;CFRT柱的滞回曲线较饱满,其抗震性能显著优于普通箍筋约束混凝土柱;在试验条件下,CFRT柱的极限侧移率在0.042~0.075之间,高于中国抗震设计规范关于罕遇地震下结构柱极限塑性侧移率不低于0.02的要求;从抗震性能来看,在RPC管内部填充高强混凝土,对于CFRT是可以接受的组合方式。

    Abstract:

    Concrete tube filled reactive powder is a new type of constained composite column based on ultra-high performance cement casing, with the mechanical properties of reactive powder concrete and the constraint effect of stirrup. In this paper, four Concrete-Filled RPC Tube (CFRT) columns and one ordinary hoops-confined concrete column were tested under cyclic and constant axial load. The failure mode, hysteresis behavior and strain development of reinforcements were investigated, and the relevant seismic parameters were analyzed. CFRT columns exhibited typical bending failure characteristics. In contrast to conventional reinforced concrete column, the surface of Reactive Powder Concrete(RPC) tube was characterized with well distributed fine cracks, without any RPC cover spalling or crushing. The hysteresis curve of CFRT cloumn is full, and its seismic performance is significantly better than that of ordinary stirrup confined concrete cloumn. Under the test conditions, the limit plastic drift ratios of CFRT columns vary between 0.042 and 0.075, which largely exceed the specified limit (0.02) according to the rare earthquake requirement in Chinese seismic design code. The results also reveal that RPC tube filled with high strength concrete is an acceptable combination for CFRT columns.

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单波,单宇,刘福财,佟广权.活性粉末混凝土预制管组合柱抗震性能试验研究[J].土木与环境工程学报(中英文),2020,42(4):94-104. Shan Bo, Shan Yu, Liu Fucai, Tong Guangquan. Experimental research on seismic behavior of concrete-filled reactive powder concrete tube[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2020,42(4):94-104.10.11835/j. issn.2096-6717.2020.028

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  • 收稿日期:2019-11-22
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  • 在线发布日期: 2020-08-10
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