rcm - 2005
DESCRIPTION
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: - PowerPoint PPT PresentationTRANSCRIPT
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 1
空間構造性能
Structural Performance
RCM-2005
Seismic Resistance of
RC-framed Masonry Wall System
Osamu JOH
Professor, Dr of Eng.
Graduate School of Engineering
Hokkaido University Turkey
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 2
空間構造性能
Structural Performance
Objective and Method
Objective:(1) To clarify seismic behaviors of RC-framed (=confined)
masonry wall structures in consideration of many effective factors on the behaviors by experiment and analysis.
(2) 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.)
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 3
空間構造性能
Structural Performance
Pilot test in 2004
Speci-men
Outside Variables
RC-columns
Joint type
Axial stress
Loading type
CMW-1
exist straight low
(B/6)
reversal
MW-1 non straight low reversal
MW-2 non break low reversal
MW-3 non straight high reversal
MW-4 non straight low one-way
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 4
空間構造性能
Structural Performance
Failure of confined masonry wall
crashShear failure
Forward loadingBackward loading
1st.Skerton2nd.SkertonLoad
(kN)
(10 )rad-3R
Q
-20 -10 0 10 20 30-400
-300
-200
-100
0
100
200
300
400
Maximum resistance in shearDegradation by crash of column
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 5
空間構造性能
Structural Performance
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Calculation of ultimate strength
A. Ultimate bending strength of RC-framed wall
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
Strength by wall reinforcement
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 6
空間構造性能
Structural Performance
Specimen in 2005LC
LC
Standard specimenWall: (unit in mm)
L=1750, H=1050, t=100, straight joint 120 bricks with holesColumns: D=225, t=100 axial bars = 6-D13 hoop = 2-6@45 compressive concrete strength = 30MPa
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 7
空間構造性能
Structural Performance
Loading system
Axial load
Lateral load
Shear span ratio =h/D
First story in three stories
Loading point
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 8
空間構造性能
Structural Performance
Variables in 2005 (1)
Shear span ratio: s
No.1: (=standard)
s = 1.0 = 2250/2200
No.4: s = 1.7 = 2250/1300
2250
2200
1300
Loading height
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 9
空間構造性能
Structural Performance
Variables in 2005 (2)
Configuration of opening
No.2: window opening= 890 x 560 mm2
No.3: door opening = 450 x 1050 mm2
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 10
空間構造性能
Structural Performance
Future investigations-1
Extension of the experimentConsideration of effective factors on seismic performance
1) Configuration of overall structures number of story
number of span
2) Three dimensional effecttransverse structuretransverse lateral loading
3) Properties of blocks and jointconfiguration, size,strength
piling way of blocks, etc.
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 11
空間構造性能
Structural Performance
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
27. Aug / 2005 Seismic Resistance of RC-framed Masonry Wall System 12
空間構造性能
Structural Performance
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