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EVALUATION OF RESTORING FORCE CHARACTERISTICS OF MUD-WALLS CONSIDERING EFFECT OF WALL-HEIGHT FOR SEISMIC STRUCTURAL DESIGN
1. EVALUATION OF RESTORING FORCE
CHARACTERISTICS OF MUD-WALLS
CONSIDERING EFFECT OF WALL-HEIGHT FOR
SEISMIC STRUCTURAL DESIGN
Hiroyuki Nakaji, Masami Gotou,
Hiro Kawahara, Yoshiyuki Suzuki
2. OBJECTIVE
• To propose the restoring force characteristics of mud-walls for seismic
structural design of wooden houses
• There is not enough information or manual on the structural design of
traditional timber buildings
• (Do we really need the rules?)
• To compare with the usual height of 2730 mm
• Two different heights of specimens with same length
• Wall-height influences on the restoring force characteristics?
3. CONCLUSIONS (in advance)
• The effect of wall-height is not significant on the restoring force
characteristics of mud-walls
• It can be assumed on the structural design of mud-walls that the wall-height’s
effect is negligible
• The restoring force characteristics for the seismic structural design
were proposed and confirmed in some mud-wall cases
21. LOADING PROCEDURE
- 1/10
- 3/40
- 1/20
- 1/40
0
1/40
1/20
3/40
1/10
• The deformation angle was
increased in stages 1/480, 1/240,
1/120, 1/90, 1/60, 1/45, 1/30,
1/20, 1/15, 1/10, and 1/7 rad
• 1/7 rad was only for Low
specimens
• Each deformation was cyclically
produced twice or three times
• Actuator’s stroke was controlled
24. DATA RECORDING (MWD CASE)
• 6-8 seconds interval
• Displacements and strains
• Take a photo at the same time
• MP4 movie file was created from thousands of photos with Movie Maker
after the experiment
35. PROPOSAL OF RESTORING FORCE
CHARACTERISTICS OF MUD-WALLS
0
20
40
60
80
100
120
0 1/20 1/10
shearstress(kN/m2)
deformation angle (rad)
1P-1.5P
1.5P-2P
MM
H
Q=2M/H Q=M/H
M
Mud-Wall Timber Framework Mud-Wall Plate
Column joint can
resist bending
moment
Two lines are suggested
because failure mode is
different
36. ASSUMPTIONS
• Superposition principle is applicable, that is, Mud-wall is really a mud-
wall plate itself plus timber framework
• Wall-Length has an effect on the restoring force characteristics
• Timber framework resists the horizontal loading at joints of members.
For example, if a column joint is made using Nagahozo (mortise-
tenon) and strengthened by Komisen (cotter-pin), the joint can resist
bending moment
39. CONCLUSIONS
• The effect of wall-height is not significant on the restoring force
characteristics of mud-walls
• It can be assumed on the structural design of mud-walls that the wall-height’s
effect is negligible
• The restoring force characteristics for the seismic structural design
were proposed and confirmed in some mud-wall cases