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

卷:

41卷

期数:

2024年04期

页码:

171-180

栏目:

防灾减灾工程

出版日期:

2024-07-19

文章信息/Info

Title:

Study on coupling effect of fire and explosion on mechanical properties of RC slab

文章编号:

1673-2049(2024)04-0171-10

作者:

覃幼辙^1,2,黄楷铅³,原小兰³,吴 优^1,3,李 治^1,3

(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. 广西建工轨道装配式建筑产业有限公司,广西 柳州 545000; 3. 桂林理工大学 土木工程学院,广西 桂林 541004)

Author(s):

QIN Youzhe^1,2, HUANG Kaiqian³, YUAN Xiaolan³, WU You^1,3, LI Zhi^1,3

(1. Guangxi Key Laboratory of Green Building Materials and Construction Industrialization, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. Guangxi Construction Railway Prefabricated Construction Industry Co., Ltd., Liuzhou 545000, Guangxi, China; 3. School of Civil Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China)

关键词:

火灾;  动力响应;  数值模拟;  RC板;  爆炸荷载

Keywords:

fire;  dynamic response;  numerical simulation;  RC slab;  explosion load

分类号:

TU375

DOI:

10.19815/j.jace.2022.09036

文献标志码:

A

摘要:

为研究火灾下钢筋混凝土(RC)板抗爆性能,利用ABAQUS有限元软件对已有试验进行模拟并验证火灾下RC板高温模型以及RC板常温爆炸模型的有效性。在此基础上,分析了火灾下RC板的爆炸工作机理,研究了受火时间、不同方位角以及不同爆炸位置对RC板在火灾下抗爆性能的影响。结果表明:火灾下的RC板受爆炸荷载作用时,板中部首先发生剪切破坏,随后楼板整体发生受弯破坏; 随着受火时长增加,混凝土受高温劣化,钢筋强度下降,RC板的抗爆性能下降严重; 在受火时长120 min工况下,板角爆炸相比板边、板中爆炸的峰值位移分别增加了134.4%、150.9%; 在受火时长180 min工况下,板角爆炸相比板边、板中爆炸的峰值位移分别增加了138.4%、159.9%; 不同位置爆炸对RC板影响较明显,其中板中爆炸对RC板的破坏程度最高,且RC板破坏越严重,其动力响应持续时间越长; 在受火时长120 min工况下,爆炸方位角为60°和90°的RC板峰值位移相比爆炸方位角30°的RC板峰值位移分别减小了4.4%、2.4%,不同方位角爆炸对RC板的影响不明显。

Abstract:

To study the anti-explosion performance of reinforced concrete(RC)slab under fire, ABAQUS finite element software was used to simulate existing test and verify the of validity of high-temperature model under fire and the normal temperature explosion model of RC slab. Based on this, the explosion mechanism of RC slab under fire was analyzed, then the effects of fire time, different azimuth angles, and different explosion positions on the anti-explosion performance of RC slab under fire were studied. The results show that when an RC slab under fire is subjected to explosive load, shear failure occurs in the middle of the slab firstly, and then flexural failure occurs in the whole slab. With the increase of fire duration, the concrete will deteriorate under high temperature and the strength of reinforcement will decline, and the explosion resistance of RC slab will decline seriously. Under the working condition of 120 min under fire, the peak displacement of slab corner explosion increases by 134.4% and 150.9% compared with that of slab edge and slab middle explosion. Under the working condition of 180 min under fire, the peak displacement of slab corner explosion increases by 138.4% and 159.9% compared with that of slab edge and slab middle explosion. The explosion at different positions has an obvious impact on RC slab, among which the explosion in the slab has the highest damage degree to RC slabs, and the more serious the damage of the RC plate is, the longer the dynamic response duration is. Under the working condition of 120 min under fire, the peak displacement of RC slab under the condition of 60° and 90° explosion azimuth angle decreases by 4.4% and 2.4% respectively compared with that of 30° explosion azimuth angle. The impact of the explosion at different azimuth angles on the RC slab is not obvious.

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备注/Memo

备注/Memo:

收稿日期:2023-09-23
基金项目:国家自然科学基金项目(52308489); 广西重点研发计划项目(桂科AB24010133); 广西高校中青年教师基础能力提升项目(2021KY0274); 广西建筑新能源与节能重点实验室项目(桂科能22-J-21-27)
通信作者:李 治(1991-),男,工学博士,副教授,E-mail:Lizhi@glut.edu.cn。

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