Problems associated with direct displacement-based design of concrete bridges with single-column piers, and some suggested improvements

Kappos, Andreas J.; Gidaris, Ioannis; Gkatzogias, Konstantinos I.

doi:10.1007/s10518-012-9354-y

Cited by 14 publications

(9 citation statements)

References 11 publications

(28 reference statements)

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“…More recently, Kappos et al (2012aKappos et al ( , 2013 have extended the DDBD procedure to properly include higher mode effects and also added additional design criteria (see Sect. 7.3.1).…”

Section: Overview Of Pbd Methods For Bridgesmentioning

confidence: 99%

“…Subsequently, elastic rotations (θ el ) are related to the corresponding inelastic ones (θ inel ), using an empirical procedure (like (Kappos et al 2012a)); use of empirical factors to estimate θ inel is an inherent limitation of the proposed procedure, since otherwise ductility factors cannot be estimated at this stage. Referring to Fig.…”

Section: Description Of the Proceduresmentioning

confidence: 99%

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Performance-Based Seismic Design and Assessment of Bridges

Kappos

2015

Perspectives on European Earthquake Engineering and Seismology

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Current trends in the seismic design and assessment of bridges are discussed, with emphasis on two procedures that merit some particular attention, displacement-based procedures and deformation-based procedures. The available performance-based methods for bridges are critically reviewed and a number of critical issues are identified, which arise in all procedures. Then two recently proposed methods are presented in some detail, one based on the direct displacementbased design approach, using equivalent elastic analysis and properly reduced displacement spectra, and one based on the deformation-based approach, which involves a type of partially inelastic response-history analysis for a set of ground motions and wherein pier ductility is included as a design parameter, along with displacement criteria. The current trends in seismic assessment of bridges are then summarised and the more rigorous assessment procedure, i.e. nonlinear dynamic response-history analysis, is used to assess the performance of bridges designed to the previously described procedures. Finally some comments are offered on the feasibility of including such methods in the new generation of bridge codes.

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Section: Overview Of Pbd Methods For Bridgesmentioning

confidence: 99%

Section: Description Of the Proceduresmentioning

confidence: 99%

Performance-Based Seismic Design and Assessment of Bridges

Kappos

2015

Perspectives on European Earthquake Engineering and Seismology

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“…(a) (b) To define the secant stiffness of the case studies, the moment of inertia reduction factors, α b for beams and α c for first-story columns, of the reference frames need to be assumed. Kowalsky [43] and Kappos et al [44] adopted 10 percent of the uncracked section stiffness to represent the secant stiffness of RC bridge piers as a start for their iterative design methods. Cheng [34] determined the member stiffness matrix with plastic hinges at one or both ends.…”

Section: Numerical Examplesmentioning

confidence: 99%

Incorporation of Torsional & Higher-Mode Responses in Displacement-Based Seismic Design of Asymmetric RC Frame Buildings

Abebe

Lee

2019

Applied Sciences

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Direct displacement-based design (DDBD) is currently a widely used displacement-based seismic design method. DDBD accounts for the torsional response of reinforced concrete (RC) frame buildings by using semi-empirical equations formulated for wall-type buildings. Higher-mode responses are incorporated by using equations obtained from only a few parametric studies of regular planar frames. In this paper, there is an attempt to eliminate torsional responses by proportioning frames’ secant stiffnesses so that the centers of rigidity and supported mass (the mass on and above each story) coincide. Once the torsional rotations are significantly reduced and only translational motions are achieved, higher-mode responses are included using a technique developed by the authors in their recent paper. The efficiency of the proposed design procedure in fulfilling the intended performance objective is checked by two plan-asymmetric 20-story RC frame building cases. Case-I has the same-plan configuration while Case-II has a different-plan configuration along the height. Both cases have different bay widths in orthogonal directions. Verification of the case studies by nonlinear time history analysis (NTHA) has shown that the proposed method results in designs that satisfy the performance objective with reasonable accuracy without redesigning members. It is believed that a step forward is undertaken toward rendering design verification by NTHA less necessary, thereby saving computational resources and effort.

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“…two explicitly and two implicitly considered) within a single application of the method; clearly, one can run MDDBD for different PLs (i.e. multiple applications of the method) but this would require at least double the computational effort, if at all feasible due to limitations related to low and moderated seismic hazard levels (Kappos et al 2012).…”

Section: Comparison Of Def-bd With Mddbdmentioning

confidence: 99%

“…Details of the latter methodology (hereafter referred to as MDDBD) regarding the adopted design assumptions (i.e. response spectrum analysis, displacement spectrum, secant stiffness at yield, controlled parameters) and identified limitations can be found elsewhere (Kappos et al 2012(Kappos et al , 2013, along with its implementation to the same bridge considering a single PL (i.e. 'life-safety').…”

Section: Introductionmentioning

confidence: 99%

Deformation-based seismic design of concrete bridges

Gkatzogias¹,

Kappos²

2015

Earthquakes and Structures

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Abstract.A performance-based design (PBD) procedure, initially proposed for the seismic design of buildings, is tailored herein to the structural configurations commonly adopted in bridges. It aims at the efficient design of bridges for multiple performance levels (PLs), achieving control over a broad range of design parameters (i.e. strains, deformations, ductility factors) most of which are directly estimated at the design stage using advanced analysis tools (a special type of inelastic dynamic analysis). To evaluate the efficiency of the proposed design methodology, it is applied to an actual bridge that was previously designed using a different PBD method, namely displacement-based design accounting for higher mode effects, thus enabling comparison of the alternative PBD approaches. Assessment of the proposed method using nonlinear dynamic analysis for a set of spectrum-compatible motions, indicate that it results in satisfactory performance of the bridge. Comparison with the displacement-based method reveals significant cost reduction, albeit at the expense of increased computational effort.

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Problems associated with direct displacement-based design of concrete bridges with single-column piers, and some suggested improvements

Cited by 14 publications

References 11 publications

Performance-Based Seismic Design and Assessment of Bridges

Performance-Based Seismic Design and Assessment of Bridges

Incorporation of Torsional & Higher-Mode Responses in Displacement-Based Seismic Design of Asymmetric RC Frame Buildings

Deformation-based seismic design of concrete bridges

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