scholarly journals Direct displacement-based design approach for isolated structures equipped with supplemental fluid viscous damper

2021 ◽  
pp. 103684
Author(s):  
Mohtasham Mohebbi ◽  
Mahsa Noruzvand ◽  
Hamed Dadkhah ◽  
Kazem Shakeri
Keyword(s):  
Design Approach ◽  
Viscous Damper ◽  
Fluid Viscous Damper ◽  
Direct Displacement Based Design ◽  
Isolated Structures ◽  
Displacement Based

An improvement of direct displacement-based design approach for steel moment-resisting frames controlled by fluid viscous dampers

2021 ◽  
pp. 136943322199249
Author(s):  
Mahsa Noruzvand ◽  
Mohtasham Mohebbi ◽  
Kazem Shakeri
Keyword(s):  
Performance Level ◽  
Design Approach ◽  
Excellent Performance ◽  
Steel Moment Resisting Frames ◽  
Moment Resisting Frames ◽  
Earthquake Records ◽  
Direct Displacement Based Design ◽  
Moment Resisting ◽  
Displacement Based ◽  
Spectral Velocity

Direct displacement-based design (DDBD) method is one of the most effective methods for performance-base design of structures that has been also employed to design structures controlled by fluid viscous damper (FVD). In previous studies, a modified DDBD has been developed to apply the higher mode effects as well as difference between spectral velocity and pseudo-spectral velocity on the design velocity of FVD. To this end, two constants were defined to correct the damping coefficient of FVD that these correction constants had been determined in a non-classical and iterative manner. In this study, a new classical method is proposed for determining these constant such that no iteration is required in DDBD. In order to be able to introduce this design approach as a reliable framework, its performance is validated under different sets of earthquake records and this design approach is also developed for structures controlled by nonlinear FVD. Steel moment-resisting frames with different numbers of stories have been designed using this method. For comparison, structures have been also designed based on DDBD proposed in previous researches. The results show that DDBD approach improved in this study is capable to achieve the design performance level under different sets of earthquake records and this design approach has more effective performance than previous design methods. Performance of steel moment-resisting frames equipped with nonlinear FVD also shows excellent performance of this design approach in achievement of desirable performance level. Therefore, DDBD approach proposed in this study can be introduced as a new classical and reliable framework because of its simplicity and excellent performance under different sets of earthquakes.

A Displacement-Based Optimal Design Method of RC Frames Subjected to Minor Earthquakes

2012 ◽  
Vol 594-597 ◽  
pp. 795-799
Author(s):  
Gui Tao Chen ◽  
De Min Wei
Keyword(s):  
Optimal Design ◽  
Optimization Design ◽  
Virtual Work ◽  
Design Method ◽  
Horizontal Displacement ◽  
Target Displacement ◽  
Programming Technique ◽  
Direct Displacement Based Design ◽  
Rc Frames ◽  
Displacement Based

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.

Equivalent viscous damping of steel members for direct displacement based design

Structures ◽  
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

Impact of Damping Scaling Factors on Direct Displacement-Based Design

2016 ◽  
Vol 32 (2) ◽  
pp. 843-859 ◽  
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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