[1]张大山,王慧青,张建春,等.端部约束部分嵌入式钢混凝土组合梁抗火性能试验[J].长安大学学报(自然科学版),2021,41(2):66-76.
　ZHANG Da shan,WANG Hui qing,ZHANG Jian chun,et al.Experimental investigation on fireresistant behavior of partial embeddedsteelconcrete composite beams with endrestraints[J].Journal of Chang’an University (Natural Science Edition),2021,41(2):66-76.
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端部约束部分嵌入式钢混凝土组合梁抗火性能试验()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年2期
页码:
66-76
栏目:
桥梁与隧道工程
出版日期:
2021-03-15

文章信息/Info

Title:
Experimental investigation on fireresistant behavior of partial embeddedsteelconcrete composite beams with endrestraints
作者:
张大山; 王慧青; 张建春; 王婧奇
（1. 华侨大学 土木工程学院，福建 厦门 361021； 2. 厦门工学院 建筑与土木工程学院，福建 厦门 361021）
Author(s):
ZHANG Dashan1;  WANG Huiqing2;  ZHANG Jianchun1;  WANG Jingqi2
（1. College of Civil Engineering, Huaqiao University, Xiamen 361021, Fujian, China; 2. College ofArchitecture and Civil Engineering, Xiamen Institute of Technology, Xiamen 361021, Fujian, China）
关键词:
桥梁工程; 抗火性能; 火灾试验; 钢混凝土组合梁; 端部约束
Keywords:
bridge engineering;  fireresistant behavior;  fire test;  steelconcrete composite beam;  endrestraints
文献标志码:
A
摘要:
为研究有约束情况下钢混凝土组合梁的抗火性能，以荷载比为主要参变量，开展了2个部分嵌入式钢混凝土组合梁在ISO 834标准升温曲线下的足尺火灾试验。借助大型结构抗火试验平台模拟火灾环境，并通过预埋热电偶测试组合梁上部混凝土板内的温度场分布；利用布设在板面的位移计测量火灾下组合梁的竖向变形；通过专门设计的装置，实现对组合梁的端部约束并测量火灾下组合梁的实时约束力。通过观察试验现象以及测得的耐火时间、挠度变形和端部约束力等，分析部分嵌入式钢混凝土组合梁在不同荷载水平下（荷载比0.3和0.5）的抗火性能。结果表明：荷载比为0.5的钢混凝土组合梁在受火71 min时达到耐火极限，即跨中最大挠度值达到组合梁跨度的1/20；荷载比为0.3的钢混凝土组合梁在受火77 min时因故停火，但根据其即时的变形值（147 mm）仅为破坏准则中变形极限要求的50%，可以推测该组合梁仍有抵抗火灾侵袭的较大潜力；根据组合梁的面内轴力全过程变化曲线，带有端部约束的钢混凝土组合梁在发生较大变形时均出现了悬链线效应，对提高组合梁的抗火性能发挥了积极作用；荷载比越高，变形发展越大，悬链线机制产生的就越早；停火时，部分嵌入式组合梁均未发生明显的坍塌、钢梁整体失稳和混凝土被压碎等不利于承载的破坏机制，仅在距离支座不远处裸露钢梁的下翼缘（端部的受压区）出现局部屈曲。
Abstract:
In order to investigate the fireresistant behaviour of steelconcrete composite beams, two fullscale fire tests were conducted subjected to ISO 834 standard fire on partial embedded steelconcrete composite beams with endrestraints (PESCBE). The fire environment was simulated by a large structural fire test platform. Temperature field of PESCBE were obtained by embedded thermal couples. The deflections of PESCBE were detected by the transducers laid on the top surface of the concrete slabs. A specialpurpose device was designed and installed to restraint the end rotation of the composite beams and measure the forces during the entire test. Based on the observed experimental phenomenon, measured fireresistant time, vertical deflection, and endrestrained forces, the fireresistant behavior of PESCBEs, which subjected to two different load levels with the ratio of 0.3 and 0.5, were analyzed. The results show that the fireresistant time of the PESCBE with the load ratio of 0.5 is 71 minutes, when the maximum midspan deflection is up to 1/20 of the spanlength finally. The fire test of the PESCBE with the load ratio of 0.3 is terminated unexpectedly at 77 minutes. At that time, its maximum deflection is 147 mm and approximately equal to about 50% of the deflection limits, and so it is supposed that the composite beam has potential capacity to resist the fire attack. According to the variation of the inplane axial forces curves, the catenary action occurred when the PESCBEs are subjected to large deflection, and it plays an active role in improving the fire resistance of the composite beams. The mechanism of catenary action has a relationship with load ratio. Higher load ratio can cause large deflection, and the catenary action can occur earlier accordingly. When the furnace was shut off, the PESCBE had no obvious failure patterns to reduce its loadingcapacity under fire, such as collapse, overall buckling failure of the steel beam, and crushed concrete, etc. However, local buckling is observed at the lower flange of the steel beam adjacent to the support of the composite beams. 14 figs, 23 refs.

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更新日期/Last Update: 2021-04-02