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RCM - 2005

RCM - 2005. Seismic Resistance of RC -framed M asonry Wall System. Osamu JOH Professor, Dr of Eng. Graduate School of Engineering Hokkaido University. Turkey. Objective and Method. Objective:

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RCM - 2005

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  1. RCM-2005 Seismic Resistance of RC-framedMasonry WallSystem Osamu JOH Professor, Dr of Eng. Graduate School of Engineering Hokkaido University Turkey Seismic Resistance of RC-framed Masonry Wall System

  2. Objective and Method • Objective: • To clarify seismic behaviors of RC-framed (=confined) masonry wall structures in consideration of many effective factors on the behaviors by experiment and analysis. • To propose easy rehabilitation method for the structures. • Method: • (1) Seismic loading tests of half scaled specimens with many test variables (opening configuration, types of blocks and joint, etc.) • (2) Numerical simulation using rigid body spring method. • (3) Experiment for the masonry wall structures strengthened by reasonable techniques (wire-mesh, new materials, etc.) Seismic Resistance of RC-framed Masonry Wall System

  3. Pilot test in 2004 Seismic Resistance of RC-framed Masonry Wall System

  4. Failure of confined masonry wall Forward loading Maximum resistance in shear Backward loading Degradation by crash of column Shear failure crash Seismic Resistance of RC-framed Masonry Wall System

  5. Calculation of ultimate strength A. Ultimate bending strength of RC-framed wall Strength by wall reinforcement B. Ultimate shear strength of RC-framed wall C. Ultimate shear strength of RC-framed & unreinforced wall D. Ultimate shear strength of reinforced wall without RC-frame Seismic Resistance of RC-framed Masonry Wall System

  6. Specimen in 2005 Standard specimen Wall: (unit in mm) L=1750, H=1050, t=100, straight joint 120 bricks with holes Columns: D=225, t=100 axial bars = 6-D13 hoop = 2-6f@45 compressive concrete strength = 30MPa Seismic Resistance of RC-framed Masonry Wall System

  7. Loading system Axial load First story in three stories Lateral load Loading point Shear span ratio =h/D Seismic Resistance of RC-framed Masonry Wall System

  8. Variables in 2005 (1) Loading height 2250 Shear span ratio: s No.1: (=standard) s= 1.0 = 2250/2200 No.4: s= 1.7 = 2250/1300 2200 1300 Seismic Resistance of RC-framed Masonry Wall System

  9. Variables in 2005 (2) Configuration of opening No.2:window opening = 890 x 560 mm2 No.3:door opening = 450 x 1050 mm2 Seismic Resistance of RC-framed Masonry Wall System

  10. Future investigations-1 Extension of the experiment Consideration of effective factors on seismic performance 1) Configuration of overall structures number of story number of span 2) Three dimensional effect transverse structure transverse lateral loading 3) Properties of blocks and joint configuration, size,strength piling way of blocks, etc. Seismic Resistance of RC-framed Masonry Wall System

  11. Future investigations-2 Analytical investigation 1) Development of analytical model using “rigid body spring method” in order to apply to three different elements: RC-members, blocks and joints. 2) Numerical analysis considering several variables in order to extend the range of test results. effect of combination loads, configuration of walls, strength of material, etc. rigid body spring method Seismic Resistance of RC-framed Masonry Wall System

  12. Future investigations-3 Rehabilitation investigation Development of easy and reasonable strengthening methods for this structure by seismic loading tests. Methods are, for example, covering with wire mesh, jacketing with new material, partial protecting at wall corners, etc. Example of strengthening effects for RC wall-frame structure Seismic Resistance of RC-framed Masonry Wall System

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