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

A displacement-based optimization design method of RC structure was proposed by combining direct displacement-based design method with nonlinear programming technique. To avert the influence of target displacement, the stationary constraint displacement was presented, and the target displacement can be updated during the optimal design process. Principle of virtual work and Gaussian integral method was employed to simplify the explicit relationship between horizontal displacement and the section dimension. Comparison analysis of the local optimal results corresponding to different displacement shapes was conducted to achieve global optimal design. The numerical tests presented demonstrate the computational advantages of the discussed methods and suggesting that the proposed method is a reliably and efficiently tool for displacement-based optimal design.

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Applicability of the direct displacement-based design procedure to concentrically braced frames with setbacks

Journal of Structural Integrity and Maintenance ◽

10.1080/24705314.2021.1914806 ◽

2021 ◽

Vol 6 (3) ◽

pp. 167-176

Author(s):

Suhaib Salawdeh

Keyword(s):

Design Procedure ◽

Braced Frames ◽

Concentrically Braced Frames ◽

Direct Displacement Based Design ◽

Concentrically Braced ◽

Displacement Based

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Equivalent viscous damping of steel members for direct displacement based design

Structures ◽

10.1016/j.istruc.2021.07.056 ◽

2021 ◽

Vol 33 ◽

pp. 4781-4790

Author(s):

Ahmad Tarawneh ◽

Sereen Majdalaweyh ◽

Hazim Dwairi

Keyword(s):

Viscous Damping ◽

Equivalent Viscous Damping ◽

Direct Displacement Based Design ◽

Steel Members ◽

Displacement Based

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Impact of Damping Scaling Factors on Direct Displacement-Based Design

Earthquake Spectra ◽

10.1193/021815eqs031m ◽

2016 ◽

Vol 32 (2) ◽

pp. 843-859 ◽

Cited By ~ 3

Author(s):

Cuiyan Kong ◽

Mervyn J. Kowalsky

Keyword(s):

Response Spectra ◽

Equivalent Linearization ◽

Base Shear ◽

Limit States ◽

Scaling Factors ◽

Equivalent Viscous Damping ◽

Direct Displacement Based Design ◽

Displacement Response Spectra ◽

Performance Limit States ◽

Displacement Based

Damping scaling factors (DSFs) play an important role in direct displacement-based design (DDBD) as they provide a means to establish displacement response spectra for damping values beyond 5%. Response spectra for multiple damping values are needed for DDBD as the approach relies on equivalent linearization, expressed in the form of effective stiffness and equivalent viscous damping, to establish design forces for prescribed performance limit states. In the past, DSFs based on the Eurocode have been employed for DDBD; however, recent research has resulted in more robust DSF models. This paper examines the accuracy of the current DSF equation used in DDBD across the parameters that are important for structural design. A nonlinear regression analysis is performed based on the data obtained by the Rezaeian et al. (2014) model, and a base shear adjustment factor (SAF) is proposed for application to the DDBD base shear equation.

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