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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年04期

页码:

54-63

栏目:

建筑结构

出版日期:

2025-07-10

文章信息/Info

Title:

Performance degradation law of grouting sleeve connections with defects under high temperature and impact load

文章编号:

1673-2049(2025)04-0054-10

作者:

刘其舟^1,2,李铭发²,庞伟东²,李楚楚²,项凡²,戴成元^1,2

(1. 桂林理工大学 广西绿色建材与建筑工业化重点实验室,广西 桂林 541004; 2. 桂林理工大学 土木工程学院,广西 桂林 541004)

Author(s):

LIU Qizhou^1,2, LI Mingfa², PANG Weidong², LI Chuchu², XIANG Fan², DAI Chengyuan^1,2

(1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. School of Civil Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China)

关键词:

灌浆套筒连接;  灌浆缺陷;  火灾;  冲击荷载;  退化规律

Keywords:

grouting sleeve connection;  grouting defect;  fire;  impact load;  degradation law

分类号:

TU375.1

DOI:

10.19815/j.jace.2024.01024

文献标志码:

A

摘要:

装配式建筑需要具备一定的抗火能力,在经历火灾后也必须满足规范要求的抗冲击性能,以避免出现连续性倒塌。套筒灌浆缺陷会严重削弱装配式建筑连接的抗火及抗冲击性能,然而目前含缺陷灌浆套筒在高温及冲击荷载下的承载力劣化模型仍未明确。为此,制作了含缺陷灌浆套筒连接试件,并研究其高温后的静力拉伸及抗冲击性能。结果表明:试件主要呈现钢筋拉断和钢筋拔出两种破坏模式,相比静力拉拔,冲击荷载作用下钢筋拔出时携带的灌浆料明显增多; 无论是常温还是高温条件下,试件屈服强度的动力增大系数D_DIF值均明显大于极限强度的D_DIF值; 屈服强度的动力增大系数D_DIF,y受温度和缺陷的影响不明显,极限强度的动力增大系数D_DIF,u总体随缺陷率的增大而减小; 相比静力拉拔,冲击拉拔条件下灌浆套筒连接的强屈比、延性比明显降低,因此应充分重视动力荷载的不利影响; 建立了可表征高温后含缺陷灌浆套筒连接静力及冲击拉伸极限承载力退化规律的计算模型,该模型可为火灾后含缺陷装配式结构的性能评估提供参考。

Abstract:

Assembled buildings need to be fire-resistant and must also meet code-required impact resistance after experiencing a fire to avoid progressive collapse. Defective grouting of sleeves can severely weaken the fire and impact resistance of assembled building connections. However, the current model for the degradation of the bearing capacity of grouting sleeve with defects under high temperature and impact load is still unclear. For this reason, specimens of grouting sleeve connections with defects were fabricated and their static tensile and impact resistance performance after high temperature were investigated. The results show that the specimen mainly presents two failure modes, which are reinforcement fracture failure and reinforcement pull-out failure. Compared with static loading, the grouting material carried by reinforcement pull-out under impact loading is obviously increased. The value of the dynamic increase factor D_DIF of the yield strength of the specimens is significantly greater than that of the ultimate strength whether at room temperature or high temperature. The dynamic increase factor of yield strength D_DIF,y is not significantly affected by temperature and defects, and the dynamic increase factor of ultimate strength D_DIF,u decreases with the increase of defect rate. The strength-yield ratio and ductility ratios of grouting sleeve connections under impact tensile conditions are significantly lower compared with static tensile, so due attention should be paid to the adverse effects of dynamic loading. A calculation model is established to characterize the degradation law of static and impact tensile ultimate bearing capacity of grouting sleeve connections with defects after high temperature. The model can provide a reference for the performance evaluation of defective assembled structures after fire.

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相似文献/References:

[1]刘其舟,李金洲,吴博诚,等.反复荷载作用下含缺陷灌浆套筒约束应力及钢筋黏结强度的预测模型[J].建筑科学与工程学报,2024,41(04):51.[doi:10.19815/j.jace.2022.08019]
　LIU Qizhou,LI Jinzhou,WU Bocheng,et al.Prediction model for restraint stress and reinforcement bond strength of grouted sleeves with defects under cycling loading[J].Journal of Architecture and Civil Engineering,2024,41(04):51.[doi:10.19815/j.jace.2022.08019]

备注/Memo

备注/Memo:

收稿日期:2024-01-03
基金项目:国家自然科学基金项目(52368014); 广西自然科学基金项目(2022GXNSFAA035581)
作者简介:刘其舟(1986-),男,工学博士,副教授,E-mail:liuqz@glut.edu.cn。
通信作者:戴成元(1974-),男,副教授,E-mail:dcy366@126.com。
Author resumes: LIU Qizhou(1986-), male, PhD, associate professor, E-mail: liuqz@glut.edu.cn; DAI Chengyuan(1974-), male, associate professor, E-mail: dcy366@126.com.

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更新日期/Last Update: 2025-07-10