Experimental Investigation on Punching Shear Mechanism of Concrete Interior Slab-Column Connections without Shear Reinforcement

被引:5
作者
Wu, Yue-Fan [1 ]
Chen, Hui [1 ]
Peng, Fei [1 ]
Yi, Wei-Jian [1 ]
机构
[1] Hunan Univ, Coll Civil Engn, Hunan Prov Key Lab Damage Diag Engn Struct, Changsha 410082, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Flat plates; Punching shear failure; Inclined cracks; Failure mechanism; Industrial endoscope; STRENGTH; SIZE; FAILURE;
D O I
10.1061/(ASCE)ST.1943-541X.0003222
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The punching shear failure of reinforced concrete flat plates has puzzled researchers for a long time due to the complexity of the punching shear mechanism and the difficulty of direct measurements of the internal failure mechanism. Measurements from previous punching shear tests cannot provide sufficient experimental evidence for revealing the failure mechanism. In this study, an industrial endoscope and specially designed strain measuring rods were installed inside small holes reserved in slabs around columns to track the occurrence and propagation of internal cracks of five isolated slab-column connections with different longitudinal reinforcement arrangements. The results indicated that critical shear cracks developed from internal diagonal cracks initiated at midheight of the slabs and unevenly distributed around the columns. The propagation of the internal diagonal cracks was independent of flexural cracks initiated at the slab tension faces but closely related to the unloading of radial strains of concrete at the slab compression faces. At the moment of punching failure, the critical shear cracks propagated from compression to tension zones, forming a punching failure cone. Moreover, the failure process was progressive, that is, the continuous weakening of the compression zone by the critical shear crack resulted in the shear splitting of the compression zone, which triggered the final failure of the connections. The experimental evidence obtained can provide a physical background and new ideas for modeling the punching shear mechanism of slab-column connections.
引用
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页数:17
相关论文
共 25 条
  • [1] ALEXANDER SDB, 1992, ACI STRUCT J, V89, P325
  • [2] American Concrete Institute (ACI), 2019, ACI 318 19
  • [3] [Anonymous], 1996, PUNCHING SHEAR CAPAC
  • [4] BAZANT ZP, 1987, ACI STRUCT J, V84, P44
  • [5] Broms CE, 2016, ACI STRUCT J, V113, P95
  • [6] CEN (European Committee for Standardisation), 2004, 199211 CEN
  • [7] Size Effect on Punching Strength of Reinforced Concrete Slabs with and without Shear Reinforcement
    Donmez, Abdullah
    Bazant, Zdenek P.
    [J]. ACI STRUCTURAL JOURNAL, 2017, 114 (04) : 875 - 886
  • [8] Einpaul J, 2016, ACI STRUCT J, V113, P135
  • [9] Influence of moment redistribution and compressive membrane action on punching strength of flat slabs
    Einpaul, Juergen
    Ruiz, Miguel Fernandez
    Muttoni, Aurelio
    [J]. ENGINEERING STRUCTURES, 2015, 86 : 43 - 57
  • [10] Measurements of internal cracking in punching test slabs without shear reinforcement
    Einpaul, Jurgen
    Ruiz, Miguel Fernandez
    Muttoni, Aurelio
    [J]. MAGAZINE OF CONCRETE RESEARCH, 2018, 70 (15) : 798 - 810