Problems in applying code-specified capacity design procedures to seismic design of tall piers

Ceravolo, Rosario; Demarie, Giacomo Vincenzo; Giordano, Luca; Mancini, Giuseppe; Sabia, Donato

doi:10.1016/j.engstruct.2009.02.042

Cited by 33 publications

(11 citation statements)

References 8 publications

(8 reference statements)

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“…It is also worth noting that the sensitivity of δω 1 /ω 1,N = 0 to variations of α 2 increases for increasing α 2 values. A similar trend was observed in [19].…”

Section: Dimensional Analysis Of the Eigenvalue Problemsupporting

confidence: 86%

“…A similar trend was observed in [19]. Although the fundamental circular frequency is significantly affected by axial load effects, the variation of higher mode frequencies is practically negligible.…”

Section: Dimensional Analysis Of the Eigenvalue Problemsupporting

confidence: 82%

“…Only few works [19][20][21] analyzed the axial load effects on the seismic behavior of slender piers. These works were oriented to the numerical solution via finite element method, presented some specific case studies of slender piers, and mainly focused on the influence of axial load effects on the ultimate behavior and collapse mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Seismic response analysis of slender bridge piers

Tubaldi

Tassotti

Dall’Asta

et al. 2014

Earthq Engng Struct Dyn

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Many bridges are built on tall and slender piers, whose seismic response may be strongly influenced by second-order effects and higher modes contributions related to the distributed pier mass. In bridge design practice, the second-order effects are often taken into account by introducing amplification factors based on an oversimplified SDOF description of the pier behavior. In this paper, the influence of both axial load and higher-order modes on the dynamic behavior and seismic response of slender bridge piers is investigated by an analytical formulation and a continuous model that overcome some limitations of the models employed in previous studies. A dimensional analysis of the eigenvalue problem is carried out to make explicit the characteristic parameters governing the system dynamic behavior, and a parametric study is performed to study their influence on the modal properties. Further, a solving method is proposed for the seismic analysis and applied to a realistic bridge. The accuracy of the proposed model and of the kinematic assumptions, leading to a linear problem, is finally tested by comparison with the results obtained by a large displacement formulation. The case study results put in evidence some aspects characteristic of the dynamic behavior of slender piers that require further investigation. The proposed analytical formulation may be efficiently used to perform extensive parametric studies for different pier and seismic input properties. © 2014 John Wiley & Sons, Ltd

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“…It is also worth noting that the sensitivity of δω 1 /ω 1,N = 0 to variations of α 2 increases for increasing α 2 values. A similar trend was observed in [19].…”

Section: Dimensional Analysis Of the Eigenvalue Problemsupporting

confidence: 86%

Section: Dimensional Analysis Of the Eigenvalue Problemsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Seismic response analysis of slender bridge piers

Tubaldi

Tassotti

Dall’Asta

et al. 2014

Earthq Engng Struct Dyn

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“…The damage or failure of hollow RC bridge piers has been reported in several earthquakes, such as the devastating magnitude 7.9 (Wenchuan) earthquake in 2008 [5]. However, current seismic design codes provide guidelines for short to medium-height piers instead of hollow tall bridge piers [4,6]. The high slenderness ratio and axial load ratio of hollow, large mass RC piers could produce different seismic performance compared with normal concrete piers.…”

Section: Introductionmentioning

confidence: 99%

Seismic Damage Model of Bridge Piers Subjected to Biaxial Loading Considering the Impact of Energy Dissipation

2019

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The large degradation of the mechanical performance of hollow reinforced concrete (RC) bridge piers subjected to multi-dimensional earthquakes has not been thoroughly assessed. This paper aims to improve the existing seismic damage model to assess the seismic properties of tall, hollow RC piers subjected to pseudo-static, biaxial loading. Cyclic bilateral loading tests on fourteen 1/14-scale pier specimens with different slenderness ratios, axial load ratios, and transverse reinforcement ratios were carried out to investigate the damage propagation and the cumulative dissipated energy with displacement loads. By considering the influence of energy dissipation on structural damage, a new damage model (M-Usami model) was developed to assess the damage characteristics of hollow RC piers. The results present four consecutive damage stages during the loading process: (a) cracking on concrete surface, (b) yielding of longitudinal reinforcements; (c) spalling of concrete, and (d) collapsing of pier after the concrete crushed and the longitudinal bars ruptured due to the flexural failure. The damage level caused by the seismic waves can be reduced by designing specimens with a good seismic energy dissipation capacity. The theoretical damage index values calculated by the M-Usami model agreed well with the experimental observations. The developed M-Usami model can provide insights into the approaches to assessing the seismic damage of hollow RC piers subjected to bilateral seismic excitations.

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“…Only few studies analyzed the axial-load effects on slender piers by employing refined multi-degree-of-freedom (MDOF) models. In this context are the work of [14] and [15], analyzing the evolution of plastic hinges formation in tall piers, and the works of [16] and [17], focusing more on the nonlinear modeling of the problem.…”

Section: Introductionmentioning

confidence: 99%

An Analytical Technique for the Seismic Response Assessment of Slender Bridge Piers

Tubaldi¹,

Tassotti²,

Dall’Asta³

et al. 2014

Proceedings of the 4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. This work proposes an analytical technique for the analysis of the effects of axial loads on the dynamic behaviour and seismic response of tall and slender bridge piers. The pier is modeled as a linear elastic INTRODUCTIONA large number of bridges over mountain areas and deep valleys are built on tall piers. Because of the rugged topography of these areas, the height of bridge piers could even reach 200 m. The seismic assessment and design of slender piers usually differs from that of short piers because of the influence of axial load effects on the dynamic behaviour.It is well known that axial load effects induce in general a reduction of the transverse bending stiffness and this may have different consequences on the transverse structural response depending on the type of loading experienced by the system. In the case of static loadings, the axial load effects usually increase the response beyond the values obtained by first order analysis. On the other hand, in the case of dynamic loadings such as earthquake-induced loadings, the interaction between axial loads and transverse displacements induces changes in the system dynamic properties and elastic periods elongation [1,2], which in turn may result on either a decrease or an increase of displacements and internal action demands.In bridge engineering-design practice, the axial-load effects are usually taken into account in a simplified manner by introducing an amplification factor for the piers seismic moments [3] evaluated via first-order analysis. Many studies in past years have been devoted to the calibration of expressions for the amplification factor [1,[4][5][6][7][8][9], on the basis of simple singledegree-of-freedom (SDOF) models. These models often consisted in a rigid inverted pendulum with an elasto-plastic rotational restraint at the base, and a tip mass at the free end with a concentrated weight force. Recent works [10,11] extended the application of the amplification factor method also to the direct displacement based design of bridge piers. Other alternative methods were defined to account for axial load effects in a simplified way, without recourse to the amplification factor. In this context, the method proposed in [12] introduced the concepts of effective height and yield point spectra for the design of piers behaving as SDOF system. The main limitation of the SDOF model employed in these studies is that it is adequate to represent only short bridge piers, for which the inertia is concentrated at the top whereas the distributed pier mass and the relevant variation of axial loads can be neglected. Slender piers, as those considered in this study, are on the contrary characterized by significant distributed masses and the analysis of their dynamic behavior should also consider higher modes effects [13]. Only few studies analyzed the axial-load effects on slender piers by employing refined multi-degree-of-freedom (MDOF) models. In this context are the work of [14] and [15], analyzing the evolution of plastic hinges formation in tall p...

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Problems in applying code-specified capacity design procedures to seismic design of tall piers

Cited by 33 publications

References 8 publications

Seismic response analysis of slender bridge piers

Seismic response analysis of slender bridge piers

Seismic Damage Model of Bridge Piers Subjected to Biaxial Loading Considering the Impact of Energy Dissipation

An Analytical Technique for the Seismic Response Assessment of Slender Bridge Piers

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