Abstract In this paper, three full-sized flat slabs measuring 4800 × 4000 × 200 mm3 supported 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.

中文翻译：

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火灾下混凝土板的冲剪性能

摘要 在本文中，三个由圆柱短柱支撑的尺寸为 4800 × 4000 × 200 mm3 的全尺寸平板在室温和高温下进行了测试，以研究它们的冲剪性能。在防火测试期间，三块板按照 ISO-834 曲线进行 180 分钟。利用红外检测和 3D 扫描来记录裂纹信息和整体变形。详细记录和描述了炉温、温度分布、水平和垂直位移、扭矩角、残余极限冲压载荷和冲压剪切锥角。基于统一强度理论的刚塑性模型被用来计算火灾对平板冲孔能力的影响。计算结果与试验结果吻合良好；因此，