Seismic Performance Spectra

2010 ◽  
Vol 163-167 ◽  
pp. 443-453
Author(s):  
Wen Feng Liu ◽  
Xing Pan Fu
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Response Spectra ◽  
Seismic Demand ◽  
Three Dimension ◽  
Seismic Demands ◽  
Performance Objective ◽  
Objective Performance ◽  
Performance Based Seismic Design ◽  
Ground Motion Records

The seismic performance spectrum is a new kind of the response spectra which is formed according to the designated performance objectives. The performance objectives are changed according to the performance objective level and period of structure, and are different in the acceleration sensitive, velocity sensitive and displacement sensitive range in the seismic performance spectrum. The seismic performance spectrum formulas are derived, which demonstrate the mathematic relationship between the seismic demands of the different performance objective levels and the period of structure. The fitted formulas of the seismic performance spectra for seismic design are obtained due to statistical result of 1085 ground motion records. The new seismic performance spectra are shown in visual three-dimension figures which can represent the seismic demand, performance objective and period of structure in this paper. The philosophy of the seismic performance spectrum is analyzed which reveals the rules for estimating seismic demand of structure at the different performance objective levels. So the multi-objective performance-based seismic design is also proposed using the seismic performance spectrum.

scholarly journals Seismic Acceleration and Displacement Demand Profiles of Non-Structural Elements in Hospital Buildings

Buildings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 243
Author(s):  
Giammaria Gabbianelli ◽  
Daniele Perrone ◽  
Emanuele Brunesi ◽  
Ricardo Monteiro
Keyword(s):  
Seismic Design ◽  
Response Spectra ◽  
Relative Displacement ◽  
Seismic Demand ◽  
Structural Elements ◽  
Practical Application ◽  
Absolute Acceleration ◽  
Floor Response Spectra ◽  
Performance Based Seismic Design ◽  
Definition Of

The importance of non-structural elements in performance-based seismic design of buildings is presently widely recognized. These elements may significantly affect the functionality of buildings even for low seismic intensities, in particular for the case of critical facilities, such as hospital buildings. One of the most important issues to deal with in the seismic performance assessment of non-structural elements is the definition of the seismic demand. This paper investigates the seismic demand to which the non-structural elements of a case-study hospital building located in a medium–high seismicity region in Italy, are prone. The seismic demand is evaluated for two seismic intensities that correspond to the definition of serviceability limit states, according to Italian and European design and assessment guidelines. Peak floor accelerations, interstorey drifts, absolute acceleration, and relative displacement floor response spectra are estimated through nonlinear time–history analyses. The absolute acceleration floor response spectra are then compared with those obtained from simplified code formulations, highlighting the main shortcomings surrounding the practical application of performance-based seismic design of non-structural elements. The absolute acceleration floor response spectra are then compared with those obtained from simplified code formulations. The results, both in terms of absolute acceleration and relative displacement floor response spectra, highlighted the influence of the higher modes of the structure and the inaccuracy of the code provisions, pointing out the need for more accurate simplified methodologies for the practical application of performance-based seismic design of non-structural elements.

SEISMIC DEMAND OF BUCKLING-RESTRAINED BRACES INSTALLED IN STEEL ARCH BRIDGES UNDER REPEATED EARTHQUAKES

2011 ◽  
Vol 05 (02) ◽  
pp. 119-150 ◽  
Author(s):  
XI CHEN ◽  
HANBIN GE ◽  
TSUTOMU USAMI
Keyword(s):  
Seismic Performance ◽  
Ground Motions ◽  
Reaction Force ◽  
Seismic Demand ◽  
Seismic Demands ◽  
Arch Bridge ◽  
Dynamic Analyses ◽  
Buckling Restrained Braces ◽  
Arch Bridges ◽  
Level 2

A steel arch bridge originally designed against moderate earthquakes is retrofitted by installation of buckling-restrained braces (BRBs) to sustain severe earthquakes. Two retrofitting methods are considered to obtain good seismic performance of this arch bridge. The original model and retrofitted models subjected to the major earthquakes are investigated by dynamic analyses using 12 patterns of severe (level 2) earthquakes as input ground motions. It is found that the retrofitted models using BRBs can greatly improve seismic performance (displacement, section force, strain, reaction force, etc.) of the steel arch bridge. In addition, to investigate the influence of repeated earthquakes on the seismic responses of the main structure and the demands of BRBs, 12 patterns of earthquake ground motions are repeated by three times. Based on the analytical results, the seismic demands of BRBs against repeated earthquakes are obtained, and the required capacity of BRBs is recommended using a safety factor concluded by comparing the demands under the earthquake applied one and three times. Finally, the influence of the different yield stress on the demand of BRBs is examined by changing the steel grade of BRBs.

EFFECT OF GRAVITY LOADING ON INELASTIC SEISMIC DEMAND OF STRUCTURES

2012 ◽  
Vol 06 (04) ◽  
pp. 1250022 ◽  
Author(s):  
SEKHAR CHANDRA DUTTA ◽  
RAJIB CHOWDHURY
Keyword(s):  
Axial Force ◽  
Seismic Design ◽  
Axial Load ◽  
Concrete Structures ◽  
Seismic Demand ◽  
Hysteresis Behavior ◽  
Performance Based Seismic Design ◽  
Yield Capacity ◽  
The Impact

Performance based seismic design requires precise assessments of inelastic seismic demand. Often, the studies to assess such demands are made without due cognizance to the impact of axial load caused by gravity. In this paper, the effect of gravity-induced axial force on load resisting members on such demand quantities is examined. To encompass the behavior of steel as well concrete structures with various types of degrading features, four different hysteresis models are used in the study. The results show that the effect of axial force on inelastic seismic demand become more significant for systems with short periods having degrading hysteresis behavior. Neglecting the effect of axial force may lead to an underestimation of yield capacity resulting in an overestimation of demand implying a safer design.

STUDY ON PERFORMANCE-BASED SEISMIC DESIGN OF SHANGHAI WORLD FINANCIAL CENTER TOWER

2009 ◽  
Vol 03 (04) ◽  
pp. 273-284 ◽  
Author(s):  
XILIN LU ◽  
JIEJIANG ZHU ◽  
YUN ZOU
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Time History ◽  
Shaking Table ◽  
Nonlinear Time History Analysis ◽  
Distribution Analysis ◽  
Element Analysis ◽  
Analytical Studies ◽  
Performance Based Seismic Design ◽  
Financial Center

The height of 101-storey Shanghai World Financial Center Tower is 492 m above ground. According to the philosophy of performance-based seismic design, the seismic performance design objectives and corresponding parameters were proposed for the structure under various seismic actions from frequent to rare earthquake levels. Analytical studies including refined finite element analysis, nonlinear time-history analysis, and stress distribution analysis on the important joint have been conducted to evaluate the structural seismic performance. Along with the analytical studies, shaking table model test and the important joint tests have been carried on in order to verify the accuracies of the analytical results as well as to complement the analytical studies. The results obtained from the studies demonstrate that the structural system meets the performance-based design objectives presented in the paper.

scholarly journals Effects of Structural and Seismic Factors on the Constant-Strength Ductility Spectra Based on NGA-West2 Database

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jinjun Hu ◽  
Qinghui Lai ◽  
Xuan Liu ◽  
Lili Xie
Keyword(s):  
Seismic Design ◽  
Demand Curve ◽  
Structural Parameters ◽  
Response Spectrum ◽  
Structural Factors ◽  
Ductility Demand ◽  
Constant Strength ◽  
Performance Based Seismic Design ◽  
The Mean ◽  
Ground Motion Records

The constant-strength ductility spectrum is a nonlinear response spectrum that is commonly used to establish the demand curve of the seismic response during performance-based seismic design. It is affected by many factors. In this paper, to evaluate the effect of the major influencing factors, including the structural parameters and seismic factors, the constant-strength ductility spectrum is calculated under different conditions based on 5535 ground motion records. Conclusions are drawn based on the mean constant-strength ductility spectra. (1) With respect to the effects of structural factors, the variation trend of the ductility spectra is highly consistent with increasing T, and the ductility spectra are usually larger for larger ζ and smaller Cy and k2. (2) With respect to the seismic factors, the ductility spectra show obvious differences in different periods; however, some parameters, such as PGA, have no influence on the ductility spectra. The results of this study can provide a theoretical basis for the calculation of ductility demand in the seismic design of structures.

Research on Performance-Based Seismic Levels of Nonstructural Components

2014 ◽  
Vol 580-583 ◽  
pp. 1609-1612
Author(s):  
Hai Hua Zhu ◽  
Guo Zhao
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Design Theory ◽  
Functional Classification ◽  
Structural Components ◽  
Nonstructural Components ◽  
Performance Based Seismic Design ◽  
Displacement Angle

By research of the functional classification, seismic fortification performance objectives and quantified targets of non-structural components, according to the case of earthquake destruction in non-structural components, analyzed the reasons for the destruction . proposed three functional classification;Based on performance-based seismic design theory, proposed four level seismic performance objectives division and quantify seismic indicators of inter story displacement angle.

scholarly journals Effectiveness of earthquake selection and scaling method in New Zealand

2007 ◽  
Vol 40 (3) ◽  
pp. 160-171 ◽  
Author(s):  
Rajesh P. Dhakal ◽  
Sandip Singh ◽  
John B. Mander
Keyword(s):  
New Zealand ◽  
Ground Motion ◽  
Ground Motions ◽  
Time History ◽  
Seismic Demand ◽  
Scaling Method ◽  
Ground Acceleration ◽  
Seismic Demands ◽  
Least Squares Fit ◽  
Ground Motion Records

In New Zealand, time history analysis is either the required or preferred method of assessing seismic demands for torsionally sensitive and other important structures, but the criteria adopted for the selection of ground motion records and their scaling to generate the seismic demand remains a contentious and debatable issue. In this paper, the scaling method based on the least squares fit of response spectra between 0.4-1.3 times the structure’s first mode period as stipulated in the New Zealand Standard for Structural Design Actions: Earthquake Actions (NZS1170.5) [1] is compared with the scaling methods in which ground motion records are scaled to match the peak ground acceleration (PGA) and spectral acceleration response at the natural period of the structure corresponding to the first mode with 5% of critical damping; i.e. Sa(T1, 5%). Incremental dynamic analysis (IDA) is used to measure the record-to-record randomness of structural response, which is also a measure of the efficiency of the intensity measure (IM) used. Comparison of the dispersions of IDA curves with the three different IMs; namely PGA, Sa(T1, 5%) and NZS1170.5 based IM, shows that the NZS1170.5 scaling method is the most effective for a large suite of ground motions. Nevertheless, the use of only three randomly chosen ground motions as presently permitted by NZS1170.5 is found to give significantly low confidence in the predicted seismic demand. It is thus demonstrated that more records should be used to provide a robust estimate of likely seismic demands.

Research on Material Damage Limits of RC Components for Performance-Based Seismic Design and Assessment

2013 ◽  
Vol 477-478 ◽  
pp. 1101-1104 ◽  
Author(s):  
Yong Le Qi ◽  
Xin Xian Zhou ◽  
Can Dong Xie
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Performance Level ◽  
Microscopic Model ◽  
Material Damage ◽  
Deformation Index ◽  
Mechanical Description ◽  
Performance Based Seismic Design ◽  
Performance Based Evaluation ◽  
Slight Damage

This paper divided the seismic performance of RC Components into five levels: integrity, slight damage, slight ~ moderate damage and serious damage, which were defined based on material damage. Physical and mechanical description of RC components in each performance level was given, which can be used as the basis of performance-based evaluation of concrete components in microscopic model and the basis of research on deformation index limits in macro components.

Study on Evaluating the Seismic Performance of Building According to Detail Seismic Condition

2015 ◽  
Vol 777 ◽  
pp. 121-129
Author(s):  
Wen Yi Zheng ◽  
Jing Zhe Jin ◽  
Hai Gong ◽  
Peng Pan
Keyword(s):  
Emergency Management ◽  
Seismic Performance ◽  
Seismic Design ◽  
Structural Design ◽  
Federal Emergency Management Agency ◽  
Building Code ◽  
Design Practice ◽  
Applied Technology ◽  
Performance Based Seismic Design ◽  
Application Programs

In the performance- based seismic design, seismic performance of building is differently evaluated according to variant seismic conditions. Most of the application programs for structural design (ETABS, SAP, MIDAS, ANSYS etc.) calculate the performance points of building according to Federal Emergency Management Agency（FEMA）, Applied Technology Council -40 (ATC -40)’s seismic building code and parameters. On this paper, we evaluated the seismic performance of building according to our national seismic building code[1] and parameters and maked suggesti- -ons on the design practice.

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