Seismic upgrading of old masonry buildings by seismic isolation and CFRP laminates: a shaking-table study of reduced scale models |
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Authors: | Miha Toma?evi? Iztok Klemenc Polona Weiss |
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Institution: | (1) Slovenian National Building and Civil Engineering Institute, Dimičeva 12, 1000 Ljubljana, Slovenia |
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Abstract: | The efficiency of improving the seismic resistance of old masonry buildings by means of seismic isolation and confining the
structure with CFRP laminate strips has been investigated. Five models of a simple two-story brick masonry building with wooden
floors without wall ties have been tested on the shaking table. The control model has been built directly on the foundation
slab. The second model has been separated from it by a damp-proof course in the form of a PVC sheet placed in the bed-joint
between the second and the third course, whereas the third model has been isolated by rubber isolators placed between the
foundation slab and structural walls. Models four and five have been confined with CFRP laminate strips, simulating the wall
ties placed horizontally and vertically at floor levels and corners of the building, respectively. One of the CFRP strengthened
models has been placed on seismic isolators. Tests have shown that a simple PVC sheet damp-proof course cannot be considered
as seismic isolator unless adequately designed. Tests have also shown that the isolators alone did not prevent the separation
of the walls. However, both models confined with CFRP strips exhibited significantly improved seismic behavior. The models
did not collapse even when subjected to significantly stronger shaking table motion than that resisted by the control model
without wall ties. |
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Keywords: | Old masonry buildings Models CFRP laminate strips Confinement Seismic isolation Seismic resistance Shaking table tests Upgrading |
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