| 足尺钢框架结构中楼板火灾行为数值分析 |
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| 引用本文： | 王勇,郭文轩,李凌志,简晓红,马帅,张耕源,赵行行. 足尺钢框架结构中楼板火灾行为数值分析[J]. 工程力学, 2021, 38(7): 133-146. DOI: 10.6052/j.issn.1000-4750.2020.07.0489 |
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| 作者姓名： | 王勇 郭文轩 李凌志 简晓红 马帅 张耕源 赵行行 |
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| 作者单位： | 中国矿业大学/中国矿业大学(北京) 深部岩土力学与地下工程国家重点实验室,江苏,徐州 221008;中国矿业大学/中国矿业大学(北京) 深部岩土力学与地下工程国家重点实验室,江苏,徐州 221008;同济大学土木工程学院,上海 200092;浙江瑞邦科特检测有限公司,浙江,杭州 310000;中国建筑科学研究院有限公司,北京 100013 |
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| 基金项目： | 国家青年自然科学基金项目(51408594);中央高校基本科研业务费专项基金项目(2019XKQYMS32);徐州市自然科学基金项目(KC19014);中国矿业大学/中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金课题(SKLGDUEK1909) |
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| 摘 要： | 为研究受火跨位置和数量对结构中混凝土楼板火灾行为影响,基于Vulcan软件,采用厚板单元和梁柱杆单元,结合EC2材料高温本构模型,对钢框架结构中受火顶层楼板(角区格和中区格)和第二层楼板(四区格)的温度和变形进行数值模拟,分析了混凝土膨胀应变对火灾下结构中楼板受火区格变形的影响规律,考察了受火板格薄膜机理、裂缝分布和钢...
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| 关 键 词： | 钢框架 火灾 数值模拟 楼板 薄膜机理 内力 |
| 收稿时间： | 2020-07-20 |
NUMERICAL ANALYSIS OF FIRE BEHAVIOR OF CONCRETE SLABS IN FULL-SCALE STEEL-FRAME STRUCTURE |
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| Affiliation: | 1.State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China2.College of Civil Engineering, Tongji University, Shanghai 200092, China3.Zhejiang Ruibangkete Testing Co. Ltd, Hangzhou 310000, China4.China Academy of Building Research, Beijing 100013, China |
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| Abstract: | The influence of the position and quantity of fire span on the fire behavior of concrete floor in the structure is studied. Based on Vulcan software, using thick plate element and beam-column element, combined with EC2 material high temperature constitutive model, the temperature and deformation of fire top floor (corner and middle) and second floor (four) in a steel frame structure are simulated numerically. The influence of concrete expansion strain on the deformation of floor slab under fire is analyzed, and the membrane mechanism, crack distribution and internal force development of steel beam are investigated. The results show that: the predicted results of floor temperature and deformation are in a good agreement with the experimental results, and the concrete expansion strain has a decisive influence on the mid-span deformation of the fire zone in the structure, that is, when the expansion strain is larger, the predicted deformation is larger; the boundary conditions have a decisive influence on the membrane mechanism and crack distribution of the heated plate, and the heated plates have three kinds of membrane mechanisms: ring type, opposite-edge U type and diagonal U type. The bending moment and axial force of the steel beam near the heated grid gradually increase, and the increase of the axial force of the steel beam is relatively large. |
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