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Title of Journal: Bull Earthquake Eng

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Abbravation: Bulletin of Earthquake Engineering

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Springer Netherlands

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DOI

10.1007/978-1-4684-7511-1_6

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1573-1456

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The relevance of energy damping in unreinforced ma

Authors: Luigi Sorrentino Omar AlShawa Luis D Decanini
Publish Date: 2011/06/19
Volume: 9, Issue: 5, Pages: 1617-1642
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Abstract

Existing unreinforced masonry buildings frequently suffer outofplane local collapse mechanisms when undergoing earthquake ground motion The energy damping that occurs during the motion due to impacts of a wall against the foundation or against other walls is a relevant parameter on the response An experimental investigation has been carried out to estimate the dissipation of kinetic energy that takes place during free oscillations Restraint conditions allow for twosided rocking wall resting on a foundation and onesided rocking wall resting on a foundation adjacent to transverse walls Five specimens have been tested modelling walls acted outofplane façades When onesided rocking is under consideration different depths of the contact surface between façade and transverse walls are considered In the case of twosided rocking the experimental coefficient of restitution is slightly lower than the analytic coefficient In the case of onesided rocking an analytic formulation is proposed and this is compared against experimental data Although the coefficient of restitution of onesided rocking is less than half that of twosided rocking it is not equal to zero Thus it cannot induce a sudden stop of the motion Hence nonlinear time history analyses performed under this assumption may prove unsafe Moreover a comparison has been carried out between overturning maps induced by twenty natural accelerograms computed for the analytic coefficient of restitution and those computed for the experimental coefficient of restitution The increased energy dissipation reduces the frequency of overturning and causes a more regular behaviour

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  2. Soil failure can be used for seismic protection of structures
  3. Response spectrum analysis for non-classically damped linear system with multiple-support excitations
  4. On the vulnerability assessment of monumental buildings
  5. Small centres damaged by 2009 L’Aquila earthquake: on site analyses of historical masonry aggregates
  6. Evidence of beneficial role of inclined piles: observations and summary of numerical analyses
  7. Results and analytical simulation of axial and diagonal compression tests on reinforced concrete panels cast with wood blocks system
  8. Consistency of ground-motion predictions from the past four decades
  9. A method for the direct determination of approximate floor response spectra for SDOF inelastic structures
  10. Accounting for end-user preferences in earthquake early warning systems
  11. Analytical prediction of ultimate moment and curvature of RC rectangular sections in compression
  12. Seismic performance of masonry residential buildings in Lorca’s city centre, after the 11th May 2011 earthquake
  13. A first approach to earthquake damage estimation in Haiti: advices to minimize the seismic risk
  14. Damage to residential buildings in Hveragerði during the 2008 Ölfus Earthquake: simulated and surveyed results
  15. Collapse risk and residual drift performance of steel buildings using post-tensioned MRFs and viscous dampers in near-fault regions
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