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Experimental study for the bearing capacity calculation of concrete expanded plates in squeezed branch piles

  • Yuwen Ju and Y. Frank Chen
Published/Copyright: November 2, 2018
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Materials Testing
From the journal Materials Testing Volume 60 Issue 11

Abstract

Small-scale model specimens of concrete expanded plates at a scale of 1 : 5 were prepared based on the normal sizes of squeezed branch piles used in engineering applications. Load tests were conducted on the model specimens using an electro-hydraulic compression-testing machine. Through the tests, the complete load-displacement curves of expanded plates were obtained. The test results indicate that the failure mode of expanded plates under the experimental conditions is generally inclined to compression failure and that the major factors affecting the expanded plate's bearing capacity are the compressive strength of concrete, the height-to-width ratio of the expanded plate, and the disc diameter ratio of the expanded plate. Based on the test results, a bearing capacity calculation model for the expanded plate was established. Additionally, a practical calculation formula for the expanded plate's ultimate bearing capacity was derived, where a correlation coefficient (β) was considered to reflect the effects of the expanded plate's failure modes and forces on its bearing capacity. Considering the approximations of the failure modes and forces of expanded plates, a β value of 0.625 may be suggested. The computed bearing capacity values from the derived formula are in good agreement with the test results, as evidenced in the comparison and verification analyses. This study demonstrates the improvement in strength design and calculation theory of expanded plates.

Kurzfassung

Kleinformatige Modellproben von erweiterten Betonplatten im Maßstab 1 : 5 wurden basierend auf der normalen Größe von Quetschpfählen hergestellt, wie sie für die Anwendungstechnik eingesetzt werden. Mit den Modellproben wurden Belastungstests durchgeführt, wobei eine elektro-hydraulische Druckversuchsanlage zum Einsatz kam. In den Versuchen wurden die kompletten Last-Verschiebungs-Kurven der erweiterten Platten aufgenommen. Die Versuchsergebnisse deuten darauf hin, dass die allgemeine Versagensart der erweiterten Platten unter den experimentellen Bedingungen ein Nachgeben unter geneigtem Druck ist und dass die Hauptfaktoren, die die Tragfähigkeit der erweiterten Platten beeinflussen, die Druckfestigkeit des Betons, das Höhen-Breiten-Verhältnis der erweiterten Platte und das Scheiben-Durchmesser-Verhältnis der erweiterten Platte sind. Basierend auf den Versuchsergebnissen wurde ein Berechnungsmodell für die erweiterte Platte aufgestellt. Darüber hinaus wurde eine praktische Berechnungsformel für die Tragfähigkeit der erweiterten Platte abgeleitet, in der ein Korrelationskoeffizient β berücksichtigt wurde, um die Auswirkungen der Versagensarten und der Kräfte der erweiterten Platte auf deren Tragfähigkeit abzubilden. Unter Berücksichtigung der Abschätzungen bezüglich der Versagensart und der Kräfte der erweiterten Platte kann ein Wert für β von 0,625 vorgeschlagen werden. Die aus der hergeleiteten Formel berechneten Tragfähigkeitswerte stimmen gut mit den Versuchsergebnissen überein, was in Vergleichs- und Verifikationsanalysen evident wurde. Die vorliegende Studie demonstriert eine Verbesserung der Festigkeitsauslegung und der Berechnungsweise von erweiterten Platten.

*Correspondence Address, Associate Prof. Dr. Yuwen Ju, School of Architecture and Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China, E-mail:
** Prof. Dr. Y. Frank Chen, Department of Civil Engineering, The Pennsylvania State University, 777 W Harrisburg Pike, Middletown, PA 17057, USA, E-mail:

Yuwen Ju, born in 1969, is associate professor at Taiyuan University of Technology, China. He obtained his Doctorate Degree in Structural Engineering from the same university in 2005. His study focuses on the mechanical properties of civil materials.

Y. Frank Chen, born in 1956, is currently a Tenured Professor at the Pennsylvania State University, Middletown, USA, and Distinguished Professor at Southwest University, Chongqing University, and East China Jiaotong University, both in China. He obtained his PhD degree from the University of Minnesota, Minneapolis, USA in 1988. He specializes in dynamic soil-structure interaction, computational methods, bridge engineering, foundations, dynamic-load resistant designs, geo-environmental engineering, and construction materials.

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Published Online: 2018-11-02
Published in Print: 2018-11-15

© 2018, Carl Hanser Verlag, München

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  13. Etching behavior of ZnO:Ga thin films
  14. Repair of an aluminum plate with an elliptical hole using a composite patch
  15. Impression creep behavior of extruded ZK60 and ZK60+1 %Y magnesium alloys
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https://doi.org/10.3139/120.111257

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Bending deformation and indentation hardness of electrochemically deposited nanocrystalline nickel-iron alloys
  5. Al-Si piston alloy behavior under combined mechanical and thermal cyclic loading with superimposed high-frequency thermal cycling
  6. Porosity of LMD manufactured parts analyzed by Archimedes method and CT
  7. Structure and mechanical properties of ADC 12 Al foam-polymer interpenetrating phase composites with epoxy resin or silicone
  8. Strength changes of 40 Cr steel subjected to cyclic torsion below the fatigue limit
  9. Auxetic aluminum sheets in lightweight structures
  10. Effect of thickness on the fracture toughness of high strength steel for gas well casings
  11. Effect of laser welding speed on the weld quality of a 5A06 aluminum alloy
  12. Correlation of ultrasound velocity with physico-mechanical properties of Jodhpur sandstone
  13. Etching behavior of ZnO:Ga thin films
  14. Repair of an aluminum plate with an elliptical hole using a composite patch
  15. Impression creep behavior of extruded ZK60 and ZK60+1 %Y magnesium alloys
  16. Experimental study for the bearing capacity calculation of concrete expanded plates in squeezed branch piles
  17. Mechanical properties and microstructure of autoclaved green UHPC blended with granite stone powders
  18. Mechanical properties and microstructure of glass carbon hybrid composites
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