装配式高强钢筋钢纤维混凝土框架节点抗震性能试验研究
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TU375.4

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河北省自然科学基金(E2018202290、E2017202278);河北省高层次人才资助项目(B2017003003);天津市建委科技项目(HE1863)


Experimental research on seismic behavior of the prefabricated frame joints with high strength reinforcement and steel fiber concrete
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    摘要:

    为研究装配式高强钢筋钢纤维混凝土框架节点的抗震性能,对2个预制装配式混凝土节点试件和1个现浇普通混凝土节点试件进行低周往复荷载试验,对比分析装配式混凝土节点试件的破坏特征、滞回特性和耗能能力等抗震性能指标。结果表明:节点核心区加入工字钢的装配式高强钢筋钢纤维混凝土梁柱中节点试件发生梁端弯曲破坏,满足“强柱弱梁”的抗震设计要求;普通现浇节点和采用钢板焊接端板连接的节点均发生节点核心区剪切破坏,而装配式混凝土节点核心区破坏程度较轻;在节点核心区及后浇区加入钢纤维能减少裂缝宽度,延缓裂缝传播,减轻核心区混凝土剥落程度,改善节点破坏形态;预制装配式混凝土梁柱节点试件的极限荷载、滞回性能和耗能能力均得到提高,刚度退化得到减缓,从而改善预制混凝土框架节点的抗震性能。

    Abstract:

    In order to study the seismic performance of the prefabricated frame joints with high strength reinforcement and steel fiber concrete, two precast concrete joints and one cast-in-situ concrete joint were conducted under low cyclic reversed load test, the failure characteristic, hysteretic behavior and energy dissipation were analyzed.The results show that the prefabricated beam-column interior joints with high strength reinforcement and steel fiber concrete, which the H-steel was adopted in joint core area, present bending failure of beam end, which meets the seismic design principle of “strong column and weak beam”.The cast-in-situ concrete joint and the joint connected by the steel plate welded end plates occur shear failure in the joint core zone, while the failure mode of prefabricated joint significantly improves.The use of steel fiber in core area and assembly segment can reduce the crack width and propagation, lighten concrete protection spalling and improve the damage pattern of joints.The ultimate load, hysteretic performance and energy dissipation capacity in the prefabricated beam-column joints are improved, the stiffness degradation is retarded and the seismic performance of prefabricated joints are improved.

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张健新,丁传林,戎贤,杨洪渭.装配式高强钢筋钢纤维混凝土框架节点抗震性能试验研究[J].土木与环境工程学报(中英文),2020,42(2):157-164. Zhang Jianxin, Ding Chuanlin, Rong Xian, Yang Hongwei. Experimental research on seismic behavior of the prefabricated frame joints with high strength reinforcement and steel fiber concrete[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2020,42(2):157-164.10.11835/j. issn.2096-6717.2019.154

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  • 收稿日期:2019-06-02
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  • 在线发布日期: 2020-04-28
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