scholarly journals Constant Ductility Site-Specific Yield Point Spectra for Seismic Design

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Duofa Ji ◽  
Weiping Wen ◽  
Changhai Zhai
Keyword(s):  
Yield Point ◽  
Seismic Design ◽  
Iterative Process ◽  
Design Method ◽  
Damping Ratio ◽  
Prediction Equation ◽  
Specific Yield ◽  
Stiffness Ratio ◽  
Vibration Period ◽  
Strength And Stiffness

Displacement-based seismic design (DBSD) is an iterative process because the strength and stiffness of a structure are needed to be adjusted in order to achieve a specific performance level, which is extremely inconvenient for designers in practice. Yield point spectra-based seismic design is treated as an alternative design method in which yield displacement as a basic parameter will not lead to an iterative process even though the lateral strength or stiffness of a structure changes during the whole design process. Along this line, this study focuses on investigating the yield point spectra (YPS) for structures located at different soil sites. YPS are computed for EPP systems under 601 earthquake ground motions. YPS for four soil sites are quantitatively analyzed by considering the influence of the vibration period, ductility factor, damping ratio, postyield stiffness ratio, and P-delta effect. The results indicate that compared with the effects of the damping ratio, the effects of the postyield stiffness ratio and P-delta effect on YPS are more profound. Finally, a prediction equation is proposed accounting for four soil sites and six ductility factors.

Yield Point Spectra for Seismic Design and Rehabilitation

2000 ◽  
Vol 16 (2) ◽  
pp. 317-335 ◽  
Author(s):  
Mark Aschheim ◽  
Edgar F. Black
Keyword(s):  
Yield Point ◽  
Seismic Design ◽  
Ground Motions ◽  
Existing Structures ◽  
Intuitive Appeal ◽  
Forward Directivity ◽  
Capacity Spectrum ◽  
Long Duration ◽  
Nonlinear Static ◽  
Strength And Stiffness

A new spectral representation of seismic demand is described for use in the seismic design of new structures and in the evaluation and rehabilitation of existing structures. Yield Point Spectra (YPS) retain the intuitive appeal of the Capacity Spectrum Method (Freeman 1978) and join the Nonlinear Static Procedures of FEMA 273/274 (1997) and ATC 40 (1996) for use in estimating displacement demands. YPS also may be used to establish admissible combinations of strength and stiffness for the design of new structures to limit system ductility and drift to arbitrary values. Graphical procedures allow admissible design regions to be established to satisfy multiple performance objectives. YPS computed for 15 ground motions classified as Short Duration, Long Duration, or as containing near-fault Forward Directivity pulses are presented for bilinear and stiffness-degrading hysteretic models.

Constant-ductility energy factors of SDOF systems subjected to mainshock–aftershock sequences

2020 ◽  
pp. 875529302095246
Author(s):  
Duofa Ji ◽  
Weiping Wen ◽  
Changhai Zhai
Keyword(s):  
Relative Intensity ◽  
Damping Ratio ◽  
Soil Condition ◽  
Stiffness Ratio ◽  
Ground Acceleration ◽  
Vibration Period ◽  
Energy Factor ◽  
Energy Factors ◽  
Covered Area ◽  
Aftershock Sequences

This article focuses on the energy factor of single-degree-of-freedom (SDOF) systems subjected to mainshock–aftershock (MSAS) sequences, of which 163 and 143 are collected from crustal and subduction regions, respectively. The recorded MSAS sequences are divided into four groups based on the relative intensity that is defined as the ratio of the peak ground acceleration ( PGA) of an aftershock to the PGA of the corresponding mainshock. Constant-ductility inelastic spectra are calculated to assess the energy factor, γ, defined as the ratio of the covered area of the skeleton load-deformation curve of the inelastic structural system to that of the corresponding elastic system with identical elastic properties, by considering various levels of structural inelasticity. Moreover, the effect of the hysteresis law, damping ratio, post-yield stiffness ratio, soil condition, and relative intensity on the energy factor is thoroughly analyzed. A predictive model is also developed as a function of the ductility factor, vibration period, damping ratio, and post-yield stiffness ratio. Such a model is expected to facilitate the energy-based seismic design of structures.

Seismic Design and Analysis of Tall Shear Wall-Frame Structure Using Viscous Damping Wall

2013 ◽  
Vol 275-277 ◽  
pp. 1553-1559
Author(s):  
Qiang Zhang ◽  
Wen Guang Liu ◽  
Wen Fu He ◽  
Yang Liu
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Damping Ratio ◽  
Shear Wall ◽  
Frame Structure ◽  
Viscous Damping ◽  
Seismic Region ◽  
Story Drift ◽  
Earthquake Action ◽  
Rare Earthquake

The design and analysis procedures of a viscous damping wall for a tall shear wall-frame structure in a high seismic region are briefly introduced. Design method and theoretical basis of viscous damping wall are described, and then the layout scheme is put forward. Under frequent and rare earthquake action, the analysis results of damping structure show that the responses can be reduced perfectly. The maximum story drift angle of viscous damping structure can satisfy the limitations of the seismic code and the additional damping ratio is increased to 3%, all of them can satisfy the target of damping performance.

Seismic Design Method for Hybrid Viaduct in Japanese Railways

2000 ◽  
Vol 16 (20) ◽  
pp. 338-346
Author(s):  
Kiyomitsu MURATA ◽  
Masato YAMADA ◽  
Tomohiro TAKAYAMA ◽  
Masanori KINOSHITA
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Seismic Design Method

Seismic design of elements outside of the short low-yield-point steel shear links

2021 ◽  
Vol 178 ◽  
pp. 106489
Author(s):  
A. Ghadami ◽  
Gh. Pourmoosavi ◽  
A. Ghamari
Keyword(s):  
Yield Point ◽  
Seismic Design ◽  
Shear Links

Research Situation on the Performance-Based Seismic Design Method for Reinforced Concrete Structure

2010 ◽  
Vol 163-167 ◽  
pp. 1757-1761
Author(s):  
Yong Le Qi ◽  
Xiao Lei Han ◽  
Xue Ping Peng ◽  
Yu Zhou ◽  
Sheng Yi Lin
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Design Method ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Seismic Evaluation ◽  
Seismic Codes ◽  
Performance Based Seismic Design ◽  
Capacity Calculation ◽  
Seismic Design Method

Various analytical approaches to performance-based seismic design are in development. Based on the current Chinese seismic codes，elastic capacity calculation under frequent earthquake and ductile details of seismic design shall be performed for whether seismic design of new buildings or seismic evaluation of existing buildings to satisfy the seismic fortification criterion “no damage under frequent earthquake, repairable under fortification earthquake, no collapse under severe earthquake”. However, for some special buildings which dissatisfy with the requirements of current building codes, elastic capacity calculation under frequent earthquake is obviously not enough. In this paper, the advanced performance-based seismic theory is introduced to solve the problems of seismic evaluation and strengthening for existing reinforced concrete structures, in which story drift ratio and deformation of components are used as performance targets. By combining the features of Chinese seismic codes, a set of performance-based seismic design method is established for reinforced concrete structures. Different calculation methods relevant to different seismic fortification criterions are adopted in the proposed method, which solve the problems of seismic evaluation for reinforced concrete structures.

scholarly journals Seismic Design Method for CFS Diagonal Strap-Braced Stud Walls: Experimental Validation

2016 ◽  
Vol 142 (3) ◽  
pp. 04015154 ◽  
Author(s):  
Luigi Fiorino ◽  
Ornella Iuorio ◽  
Vincenzo Macillo ◽  
Maria Teresa Terracciano ◽  
Tatiana Pali ◽  
...  
Keyword(s):  
Seismic Design ◽  
Experimental Validation ◽  
Design Method ◽  
Seismic Design Method

PUSHOVER ANALYSIS BY ONE ELEMENT PER MEMBER FOR PERFORMANCE-BASED SEISMIC DESIGN

2010 ◽  
Vol 10 (01) ◽  
pp. 111-126 ◽  
Author(s):  
S. W. LIU ◽  
Y. P. LIU ◽  
S. L. CHAN
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Pushover Analysis ◽  
Nonlinear Behavior ◽  
Computational Effort ◽  
Effective Length ◽  
Single Element ◽  
Individual Element ◽  
Economical Design ◽  
Performance Based Seismic Design

Nonlinear static (pushover) analysis is an effective and simple tool for evaluating the seismic response of structures and offers an attractive choice for the performance-based design. As such, it has generally been used in modern design due to its practicality. However, the nonlinear plastic design method consumes extensive computational effort for practical structures under numerous load cases. Thus, an efficient element capturing the nonlinear behavior of a beam-column will be useful. In this paper, the authors propose a practical pushover analysis procedure using a single element per member for seismic design. As an improvement to previous research works, both P – Δ and P – δ effects as well as initial imperfections in global and member levels are considered. Therefore, the section capacity check without the assumption of effective length is adequate for present design and the conventional individual element design is avoided. The uncertainty of the buckling effects and effective length method can be eliminated and so a more economical design can be achieved. Two benchmark steel frames of three-storey and nine-storey in FEMA 440 were analyzed to illustrate the validity of the proposed method.

scholarly journals STUDY ON SEISMIC DESIGN METHOD OF ANCHORED SHEET PILE QUAY WALL AT FISHING PORTS

2018 ◽  
Vol 74 (2) ◽  
pp. I_240-I_245
Author(s):  
Kimiyasu SAEKI ◽  
Hidemasa SATO ◽  
Teruhisa FUJII ◽  
Kunitomo ASAKURA ◽  
Masayuki FUDO ◽  
...  
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Sheet Pile ◽  
Quay Wall ◽  
Seismic Design Method
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