Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Punching shear performance of concrete slabs under fire
Highlights Three full-sized flat slabs were tested at ambient and elevated temperatures. The punching shear bearing capacity of the specimens was greatly weakened by fire. Cracks mainly presented a radiating pattern, and oblique cracks rapidly developed on the plate surface under fire. Infrared (IR) detection was used to realize real-time monitoring of crack development at high temperatures. Detonation of concrete occurred at the plate bottom under the fire. A 3D scanner was used to record the explosive crushing characteristics and scan overall structural deformations. The rigid-plastic model based on unified strength theory could be used to solve the punching shear bearing capacities of plate-column structures under and after fire.
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.
Punching shear performance of concrete slabs under fire
Highlights Three full-sized flat slabs were tested at ambient and elevated temperatures. The punching shear bearing capacity of the specimens was greatly weakened by fire. Cracks mainly presented a radiating pattern, and oblique cracks rapidly developed on the plate surface under fire. Infrared (IR) detection was used to realize real-time monitoring of crack development at high temperatures. Detonation of concrete occurred at the plate bottom under the fire. A 3D scanner was used to record the explosive crushing characteristics and scan overall structural deformations. The rigid-plastic model based on unified strength theory could be used to solve the punching shear bearing capacities of plate-column structures under and after fire.
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.
Punching shear performance of concrete slabs under fire
Wang, Dong-ye (Autor:in) / Dong, Yu-li (Autor:in) / Zhang, Da-shan (Autor:in) / Wang, Wei-hua (Autor:in) / Lu, Xin (Autor:in)
Engineering Structures ; 225
06.07.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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