- New seismic construction categories for reinforced concrete block structural walls: Experiments
- R. Drysdale ; W.W. El-Dakhakhni ; M. Shedid
- Book Title / Journal: 15th International Brick and Block Masonry Conference, Florianópolis, Brazil
- Year: 2012 , Volume: , Series:
- Earthquake engineering
PDF |
- New seismic construction categories for reinforced concrete block structural walls: Analysis
- R. Drysdale ; W.W. El-Dakhakhni ; M. Shedid
- Book Title / Journal: 15th International Brick and Block Masonry Conference, Florianópolis, Brazil
- Year: 2012 , Volume: , Series:
- Earthquake engineering
PDF |
- Ductility of reinforced concrete masonry shear walls under seismic loading
- M. Shedid ; R. Drysdale ; W. El-Dakhakhni
- Book Title / Journal: 14th World Conference on Earthquake Engineering, Beijing, China, Paper 14-05-04-0013
- Year: 2008 , Volume: , Series:
- Earthquake engineering
- Description
- The possibility of achieving a high level of ductility by flexural yielding in fully grouted reinforced concrete
masonry shear walls is evaluated. Six full-scale walls were tested to failure under reversed cyclic lateral loading
to investigate the effects of the amount and the distribution of vertical reinforcement and the level of axial
compressive stress on the inelastic behavior and ductility of reinforced masonry shear walls. The test results
indicated that the top wall displacement at the onset of yielding of the vertical reinforcement was highly
dependent on the amount of reinforcement and minimally affected by the level of axial compressive load.
However, at maximum lateral loads, the wall displacements were less sensitive to the amount of vertical
reinforcement and to the level of axial compression. Correspondingly, the displacement ductility was found to
be very sensitive to the amount of vertical reinforcement compared to the level of axial compression. In general,
high levels of ductility accompanied by relatively small strength degradation were observed for the test
specimens.
PDF |
- Seismic response of linear, flanged, and confined masonry shear walls
- M. Shedid ; W. El-Dakhakhni ; R. Drysdale
- Book Title / Journal: 14th World Conference on Earthquake Engineering, Beijing, China, Paper 14-05-04-0015
- Year: 2008 , Volume: , Series:
- Earthquake engineering
- Description
- A potentially limiting feature of reinforced masonry shear walls is the presence of a single line of vertical
reinforcement along the wall length that cannot be effectively tied to delay buckling. Especially under cyclic
loading, when opening and closure of wide cracks occurs, compression closure of the previous tension cracks
causes all of the compressive stresses to be carried by isolated bars at the crack location. This situation affects
the stability of the compression zone and may lead to out-of-plane buckling of the wall or local buckling of the
reinforcement, which can lead to an accelerated degradation in strength due to increased damage. This limitation
may be avoided by using boundary elements at the end zones of the walls or by structurally connecting a linear
wall to an intersecting wall which would limit the damage at the end zone of the wall, provide out-of-plane
stability for the end of the wall, and delay buckling of the vertical bars. The experimental data presented is the
first phase of an investigation of the response of flexural concrete masonry shear walls with various geometries
at the ends of the walls. The conditions studied are the effects of structurally connecting a flange to a linear
reinforced masonry shear wall and of creating a boundary element at each end of the wall. The walls were tested
under reversed lateral cyclic displacement simulating earthquake excitation. Details of the linear, flanged, and
confined wall tests are presented in this paper. In general, high levels of ductility accompanied by relatively
small strength degradation were observed for the test specimens with significant increase in ductility for the
flanged and confined walls.
PDF |
