Experimental study on fire resistance of precast concrete columns with efficient reinforcement

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Experimental study on fire resistance of precast concrete columns with efficient reinforcement

机译：高效钢筋混凝土预制柱的抗火性能试验研究。

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In order to improve installation efficiency, construction quality and reduce the cost of monolithic precast concrete frame structures, precast concrete columns reinforced by efficient reinforcement have been proposed in recent years. Their static and seismic behaviors generally meet design expectations, while, to the authors' best knowledge, their fire resistance has not been properly studied. In this paper, results from fire resistance experiments on full-scale precast concrete columns reinforced by efficient reinforcement under standard fire exposure conditions are presented. The effect of reinforcement forms, load intensity and fire conditions on the fire resistance of the precast concrete columns has been studied. The test results show that fire resistance of the connection zone of the precast concrete column is higher than that of the non-connection zone. The test results also show that precast concrete columns reinforced by cluster reinforcement have a higher fire resistance than columns reinforced by large-diameter reinforcement. On the basis of the test results and the calculation methods current in use, a simplified approach that considers the effect of cross-sectional area reduction and temperature difference caused by spalling is proposed to predict fire resistance of precast concrete columns reinforced by efficient reinforcement.

机译：为了提高安装效率，施工质量并降低整体式预制混凝土框架结构的成本，近年来提出了通过高效加固来增强预制混凝土柱的方法。它们的静态和地震行为总体上符合设计要求，而据作者所知，还没有对其耐火性进行适当的研究。本文介绍了在标准火灾暴露条件下，通过高效加固来加固的大型预制混凝土柱的耐火性试验结果。研究了钢筋形式，荷载强度和火灾条件对预制混凝土柱耐火性的影响。试验结果表明，预制混凝土柱连接区域的耐火性高于非连接区域。试验结果还表明，采用集束加固的预制混凝土柱的耐火性比采用大直径加固的混凝土柱更高。根据测试结果和目前使用的计算方法，提出一种简化的方法，该方法考虑了剥落引起的横截面积减小和温度差异的影响，以预测高效加固后的预制混凝土柱的耐火性。

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《Engineering Structures》 |2020年第1期|109947.1-109947.14|共14页
作者

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作者单位

Wuhan Univ Sch Civil Engn Wuhan 430072 Peoples R China;

Wuhan Univ Sch Civil Engn Wuhan 430072 Peoples R China|Engn Res Ctr Urban Disasters Prevent & Fire Rescu Wuhan 430072 Peoples R China;

Univ Lancaster Dept Engn Lancaster LA1 4YR England;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Precast concrete columns; Efficient reinforcement; Cluster reinforcement; Large-diameter reinforcement; Rebar splicing by grout-filled coupling sleeve; Rebar lapping in grout-filled hole; Fire resistance;

机译：预制混凝土柱;高效加固;集群强化;大直径钢筋;灌浆填充的连接套筒进行钢筋拼接;钢筋在灌浆孔中研磨;防火性能;

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专利

1. Experimental study on the seismic behavior of precast concrete column with grouted corrugated sleeves and debonded longitudinal reinforcements [J] . Chen Jun, Zhao Chenhui, Ding Faxing, Advances in Structural Engineering . 2019,第15期

机译：灌浆波纹套管与剥离纵向钢筋的预制混凝土柱抗震性能试验研究。
2. Experimental study on seismic behavior of precast concrete column with grouted sleeve connections considering ratios of longitudinal reinforcement and stirrups [J] . Liu Yangqing, Zhou Binbin, Cai Jianguo, Bulletin of earthquake engineering . 2018,第12期

机译：考虑纵向加固和搅拌比率的预制混凝土柱的抗震性能试验研究
3. Experimental study on seismic behavior of precast concrete column with grouted sleeve connections considering ratios of longitudinal reinforcement and stirrups [J] . Liu Yangqing, Zhou Binbin, Cai Jianguo, Bulletin of earthquake engineering . 2018,第12期

机译：考虑纵向加固和搅拌比率的预制混凝土柱抗震性能试验研究
4. AN EXPERIMENTAL STUDY AND CALCULATION ON THE FIRE RESISTANCE OF CONCRETE-FILLED SHS AND RHS COLUMNS [C] . Lin-Hai Han, Lei Xu, You-Fu Yang Third International Conference on Advances in Steel Structures Vol.2, Dec 9-11, 2002, Hong Kong, China . 2002

机译：混凝土SHS和RHS柱耐火性的试验研究与计算
5. Experimental evaluation of a precast concrete beam-to-column prototype design under a column removal scenario. [D] . Torres-Alamo, Jorge O. 2017

机译：拆除柱子的情况下预制混凝土梁柱原型设计的实验评估。
6. Experimental Study on the Shear Behavior of Precast Wall Concrete Joints with/without Dowel Reinforcement [O] . Qing Zhi, Xinfu Xiong, Wenjie Yang, 2020

机译：带/不带销钉的预制墙混凝土节点抗剪性能试验研究
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。
8. Experimental Evaluation of the Failure of a Seismic Design Category - B Precast Concrete Beam-Column Connection System. [R] . Torres-Alamo, J. O., Chiarito, V. P., Blake, H. L. 2014

机译：B型预制混凝土梁柱连接系统失效的试验评价。

Experimental study on fire resistance of precast concrete columns with efficient reinforcement

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