Punching shear performance of concrete slabs under fire

Punching shear performance of concrete slabs under fire
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火灾下混凝土板的冲剪性能

DOI:
10.1016/j.engstruct.2020.111094
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发表时间:
2020-12
影响因子:
5.5
通讯作者:
Lu Xin
Lu Xin
中科院分区:
工程技术2区
文献类型:
--
作者:
Wang Dongye;Dong Yuli;Zhang Dashan;Wang Weihua;Lu Xin

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本文对3块4800 × 4000 × 200 mm 3的圆柱短柱支承无梁板进行了常温和高温下的冲切试验,研究了其冲切性能。在耐火试验期间,三块板经受ISO-834曲线180分钟。利用红外探测和三维扫描记录裂缝信息和整体变形。炉内温度,温度分布,水平和垂直位移,扭矩角,剩余的极限冲切载荷,冲切锥角进行了详细记录和描述。采用基于统一强度理论的刚塑性模型,计算火灾对无梁板抗冲切承载力的影响。计算结果与试验结果吻合较好,表明刚塑性模型可用于无梁板的抗冲切承载力预测。
In this paper, three full-sized flat slabs measuring 4800 × 4000 × 200 mm3supported by a circular column stub were tested at ambient and elevated temperatures to investigate their punching shear performance. During the fire tests, three slabs were submitted to the ISO-834 curve for 180 min. Infrared detection and 3D scanning were utilized to record crack information and overall deformations. Furnace temperatures, temperature distributions, horizontal and vertical displacements, torque angles, residual ultimate punching loads, and punching shear taper angles were recorded and described in detail. A rigid-plastic model based on unified strength theory was used to calculate the effect of fire on the punching capacity of the flat slab. The calculated results fitted the test results well; thus, the rigid-plastic model can be used to predict the punching capacity of flat slabs.
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