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<p>A structure can be designed to resist to an earthquake of a given intensity without suffering major damage, by absorbing the seismic energy through elastic behaviour. However, such a design would not be economical. It would be more realistic to provide the structure with the capacity to deform in a ductile manner beyond its elastic limit. This allows the structure to absorb a large part of the seismic energy through non-elastic behaviour and admit a risk damage that can be controlled and repaired, without causing the collapse of the structure. It is in this spirit that the design regulations recommend reducing the forces resulting from a linear elastic calculation by using the behaviour coefficient, and which takes a single value (R = 2) in the Algerian seismic code (RPA2003), for elevated tanks. Recent researches have shown that this behaviour coefficient (R) depends on several parameters. In this research, the effect of various parameters, such as pedestal height, structure ductility, soil site, seismic zone and storage capacity, are analysed in the behaviour of the elevated tanks. A total of 720 RC elevated water tanks of different pedestal heights and storage capacities are analyzed using the nonlinear analysis based on the Pushover method to evaluate the behaviour coefficient (R) values. These tanks were designed using RPA2003. As a main result of this research, a more realistic law of power type is proposed to evaluate the (R) coefficient as a function of the fundamental period of the elevated tank in each seismic zone. This study concluded that the behaviour coefficient (R) varies from 1.5 in a low seismicity zone to 4.6 in a very high seismicity zone, instead of taking a unique value (R = 2) for all RC elevated tanks irrespective of their pedestal height, storage capacity, seismic zone. A precise calculation of this behaviour coefficient has an applicative character, because it leads to a reduction of the materials amounts used in construction. This research puts the basis for a reflection in forecast of RPA2003 revision.</p>

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Assessment of the behaviour coefficient for an RC pedestal in an elevated water tank by a nonlinear approach

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Ourdia Ider,
  • Hocine Hammoum,
  • Karima Bouzelha,
  • Amar Aliche

摘要

A structure can be designed to resist to an earthquake of a given intensity without suffering major damage, by absorbing the seismic energy through elastic behaviour. However, such a design would not be economical. It would be more realistic to provide the structure with the capacity to deform in a ductile manner beyond its elastic limit. This allows the structure to absorb a large part of the seismic energy through non-elastic behaviour and admit a risk damage that can be controlled and repaired, without causing the collapse of the structure. It is in this spirit that the design regulations recommend reducing the forces resulting from a linear elastic calculation by using the behaviour coefficient, and which takes a single value (R = 2) in the Algerian seismic code (RPA2003), for elevated tanks. Recent researches have shown that this behaviour coefficient (R) depends on several parameters. In this research, the effect of various parameters, such as pedestal height, structure ductility, soil site, seismic zone and storage capacity, are analysed in the behaviour of the elevated tanks. A total of 720 RC elevated water tanks of different pedestal heights and storage capacities are analyzed using the nonlinear analysis based on the Pushover method to evaluate the behaviour coefficient (R) values. These tanks were designed using RPA2003. As a main result of this research, a more realistic law of power type is proposed to evaluate the (R) coefficient as a function of the fundamental period of the elevated tank in each seismic zone. This study concluded that the behaviour coefficient (R) varies from 1.5 in a low seismicity zone to 4.6 in a very high seismicity zone, instead of taking a unique value (R = 2) for all RC elevated tanks irrespective of their pedestal height, storage capacity, seismic zone. A precise calculation of this behaviour coefficient has an applicative character, because it leads to a reduction of the materials amounts used in construction. This research puts the basis for a reflection in forecast of RPA2003 revision.