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Analysis of Tri-axial Stress-strain Conditions of Pre-stressed Masonry Corner

V S B-TU, Faculty of Civil Engineering. Ostrava, Czech Republic. Analysis of Tri-axial Stress-strain Conditions of Pre-stressed Masonry Corner. Radim Cajka Pavlina Mateckova Lucie Mynarzova Marie Stara. REC 2012, Brno , Czech Republic , 13.-15. June , 2012. PRE-STRESSED MASONRY.

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Analysis of Tri-axial Stress-strain Conditions of Pre-stressed Masonry Corner

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  1. VSB-TU, Faculty of Civil Engineering Ostrava, Czech Republic Analysis of Tri-axial Stress-strain Conditions of Pre-stressed Masonry Corner Radim Cajka Pavlina Mateckova Lucie Mynarzova Marie Stara REC 2012, Brno, Czech Republic, 13.-15. June, 2012

  2. PRE-STRESSED MASONRY Motivation for testing • Church in Staric, Czech Republic REC 2012, Brno, Czech Republic, 13.-15. June, 2012

  3. PRE-STRESSED MASONRY Motivation for testing • Old Town Hall, Ostrava, Czech Republic REC 2012, Brno, Czech Republic, 13.-15. June, 2012 3

  4. PRE-STRESSED MASONRY Motivation for testing • Venezia,Italy REC 2012, Brno, Czech Republic, 13.-15. June, 2012 4

  5. PRE-STRESSED MASONRY Description of testing • Masonry corner • Plan dimensions 900 x 900 mm • Thickness of the wall 450 mm • Height 900 mm REC 2012, Brno, Czech Republic, 13.-15. June, 2012 5

  6. PRE-STRESSED MASONRY Description of testing • Material • Clay bricks • Lime-cement mortar REC 2012, Brno, Czech Republic, 13.-15. June, 2012 6

  7. PRE-STRESSED MASONRY Description of testing • Vertical load and pre-stressing force • 0.125 MPa • 50 kN • 100 kN • 0.250 MPa • 50 kN • 100 kN REC 2012, Brno, Czech Republic, 13.-15. June, 2012 7

  8. PRE-STRESSED MASONRY Description of testing • Measuring of deformations • Net of potentiometer sensors • Short time deformations • Pre-stressing in one or two directions REC 2012, Brno, Czech Republic, 13.-15. June, 2012 8

  9. PRE-STRESSED MASONRY Material characteristics • Bricks from demolished building • HistAn software • 6 bricks • From each 4 specimen • Mean valuefb = 16.08 MPa • Variation coefficient 0.28 REC 2012, Brno, Czech Republic, 13.-15. June, 2012 9

  10. PRE-STRESSED MASONRY Material characteristics • Mortar from dry mixture • HistAn software • 6 block specimen • Mean value fm = 9.8 MPa • Variation coefficient 0.04 REC 2012, Brno, Czech Republic, 13.-15.June, 2012 10

  11. PRE-STRESSED MASONRY Masonry compressive strength AntHill software using monte carlo simulation REC 2012, Brno, Czech Republic, 13.-15. June, 2012 11

  12. PRE-STRESSED MASONRY Masonry compressive strength • AntHill software using montecarlo simulation • fmean = 7.37 MPa • fk = 5.29 MPa REC 2012, Brno, Czech Republic, 13.-15. June, 2012 12

  13. PRE-STRESSED MASONRY Masonry compressive strength Action effect from pre-stressing REC 2012, Brno, Czech Republic, 13.-15. June, 2012 13

  14. TESTING RESULTS Direction of pre-stressing REC 2012, Brno, Czech Republic, 13.-15. June, 2012 14

  15. TESTING RESULTS Net of measuring poitns REC 2012, Brno, Czech Republic, 13.-15. June, 2012 15

  16. TESTING RESULTS Measured deformations Vertical load 0.125 MPa, pre-stressing force 100 kN REC 2012, Brno, Czech Republic, 13.-15. June, 2012 16

  17. TESTING RESULTS Measured deformations Vertical load 0.125 MPa, pre-stressing force 100 kN REC 2012, Brno, Czech Republic, 13.-15. June, 2012 17

  18. MASONRY NUMERICAL MODELLING Basic ways of modelling • Complicated with following factors: • Different material properties of basic components • Different dimensions of basic components • Narrow dimension of mortar joint • Geometrical arrangement of bricks • Different structural response for different load action direction • Interaction between components • Quality of manufacturing • Environmental influence REC 2012, Brno, Czech Republic, 13.-15. June, 2012 18

  19. MASONRY NUMERICAL MODELLING Basic ways of modelling • Three basic approaches: • Detailed micromodel • Simplified micromodel • Macromodel REC 2012, Brno, Czech Republic, 13.-15. June, 2012 19

  20. MASONRY NUMERICAL MODELLING Micromodel • Ansys software: • Solid 45 • Link 8 REC 2012, Brno, Czech Republic, 13.-15. June, 2012 20

  21. MASONRY NUMERICAL MODELLING From micromodel to macromodel REC 2012, Brno, Czech Republic, 13.-15.June, 2012 21

  22. MASONRY NUMERICAL MODELLING From micromodel to macromodel Input and output parameters REC 2012, Brno, Czech Republic, 13.-15. June, 2012 22

  23. MASONRY NUMERICAL MODELLING Macromodel • Ansys software: • Solid 45 • Link 8 REC 2012, Brno, Czech Republic, 13.-15.June, 2012 23

  24. MASONRY NUMERICAL MODELLING MicromodelxMacromodel Section in place of upper pre-stressing bar REC 2012, Brno, Czech Republic, 13.-15.June, 2012 24

  25. CONCLUSION • Testing of masonry corner exposed to tri-axial load • Small measured deformations • Unexpected course of deformation • Testing of material properties • Relatively high strength of bricks • High variation coefficient • Numerical modelling of masonry • Calculated deformation respond to measurements • Micromodel reflect the expeceted way of str. break REC 2012, Brno, Czech Republic, 13.-15. June, 2012 25

  26. VŠB-TU, Faculty of Civil Engineering Ostrava, Czech Republic Thanks for attention! REC 2012, Brno, Czech Republic, 13.-15. June, 2012

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