Mechanical Response Mechanism of Simply Supported Two-Way Reinforced Concrete Slab with In-plane Constraints Under Fire

被引：0
|
作者：
Ding F.-X. [1 ]
Zha X.-H. [1 ]
Wang W.-J. [1 ]
Jiang B.-H. [1 ]
机构：
[1] School of Civil Engineering, Central South University, Changsha
来源：
Dongbei Daxue Xuebao/Journal of Northeastern University | 2024年 / 45卷 / 03期
关键词：
fire; in ‐ plane constraint; inverted arch effect; mechanical response; two ‐ way reinforced concrete slab;
D O I：
10.12068/j.issn.1005-3026.2024.03.017
中图分类号：
学科分类号：
摘要：
The existing analysis methods lack a reasonable explanation for the cracking，deformation response，and the mechanism of fire resistance reduction caused by the internal confinement of the simply supported two‐way reinforced concrete slab with in‐plane constraints under the fire. Therefore，three‐dimensional solid finite element models of simply supported two‐way reinforced concrete slab with in‐plane constraints under fire in both temperature field and thermo‐mechanical coupling analysis were established using the ABAQUS software. On the basis of experimental verification，further parameter analysis was carried out to investigate the deflection，stress variation law，and mechanical response mechanism of steel bars and concrete. The results show that in the case of fire，the in‐plane constraining force weakens the inverted arch effect and tensile film effect of the plate，resulting in a significant decrease in fire resistance. An increase in unidirectional and two‐way in‐plane constraints，aspect ratio，and load ratio will shorten the duration of the inverted arch effect and tension membrane effect stages of plate. © 2024 Northeast University. All rights reserved.
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页码：439 / 448
页数：9
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