scholarly journals Optimum Performance-Based Seismic Design Using a Hybrid Optimization Algorithm

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
S. Talatahari ◽  
A. Hosseini ◽  
S. R. Mirghaderi ◽  
F. Rezazadeh
Keyword(s):  
Seismic Design ◽  
Hybrid Algorithm ◽  
Pushover Analysis ◽  
Optimization Method ◽  
Hybrid Optimization ◽  
Performance Levels ◽  
Electrical Physics ◽  
Performance Based Seismic Design ◽  
Charged System ◽  
Comparison Of The Results

A hybrid optimization method is presented to optimum seismic design of steel frames considering four performance levels. These performance levels are considered to determine the optimum design of structures to reduce the structural cost. A pushover analysis of steel building frameworks subject to equivalent-static earthquake loading is utilized. The algorithm is based on the concepts of the charged system search in which each agent is affected by local and global best positions stored in the charged memory considering the governing laws of electrical physics. Comparison of the results of the hybrid algorithm with those of other metaheuristic algorithms shows the efficiency of the hybrid algorithm.

scholarly journals Performance-Based Seismic Design for buildings

2020 ◽  
Vol 16 (2) ◽  
pp. 161-166
Author(s):  
Mathieu Gil-oulbé ◽  
Fouad Adnan Noman Abdullah Al-Shaibani ◽  
Abass Saad Lina
Keyword(s):  
Seismic Design ◽  
Pushover Analysis ◽  
Earthquake Hazard ◽  
Seismic Load ◽  
Limit States ◽  
Performance Levels ◽  
Load Carrying ◽  
Story Drift ◽  
Performance Based Seismic Design ◽  
Immediate Occupancy

Structures are designed using current seismic design codes which are mostly based on Force-Based Design approach. The aim of the work is to implement the Performance-Based Seismic Design (PBSD) approach in concrete buildings. PBSD, which is a new concept in seismic design of structures, is a reliable approach capable of providing more detailed information on the performance levels of both structural and non-structural elements. Methods. In this study Performance-Based Seismic Design has been utilized on reinforced concrete irregular frame. In order to do this pushover analysis was done. Story drift ratios were chosen as deformation limits to define the performance levels for specific earthquake hazard levels. The results of this study show that Performance-Based Seismic Design gives a structure with better seismic load carrying capacity, thereby achieving the objective of performance as well as economy. It is also possible to conclude that PBSD obtained by above procedure satisfies the acceptance criteria for immediate occupancy and life safety limit states for various intensities of earthquakes.

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.

Study on Performance Index for Reinforced Concrete Bridge Structures

2012 ◽  
Vol 193-194 ◽  
pp. 1079-1085
Author(s):  
Ben Yan Lu ◽  
Zhong Bin Cai ◽  
Zhong Qin Ye ◽  
Ya Jun Chen
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Bridge Columns ◽  
Concrete Bridge ◽  
Performance Levels ◽  
Reinforced Concrete Bridge ◽  
Flexural Failure ◽  
Operational Life ◽  
Bridge Structures ◽  
Performance Based Seismic Design

According to the failure characteristics of reinforced concrete bridge columns and the need of performance based seismic design in bridge, reinforced concrete bridge column performance levels, which are categorized into fully operational, temporarily operational, reparably operational, life safe and near collapse levels are established. To relate bridge damage to socio-economic descriptions at the five designated performance levels, qualitative indices are established. Considering field investigations following a seismic event, quantitative indices for the same five designated performance levels are proposed. Based on the statistical data of 154 seismic performance tests of RC bridge columns with circular section subjected to flexural failure, drift ratio limit for the same five designated performance levels are put forward. It can be used to determine displacement of pier top in performance based seismic design.

scholarly journals Performance-Based Seismic Design of Steel Frames Utilizing Colliding Bodies Algorithm

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
H. Veladi
Keyword(s):  
Seismic Design ◽  
Optimization Algorithm ◽  
Pushover Analysis ◽  
Steel Frames ◽  
Design Methods ◽  
Frame Structures ◽  
Analysis Method ◽  
Numerical Examples ◽  
Colliding Bodies Optimization ◽  
Performance Based Seismic Design

A pushover analysis method based on semirigid connection concept is developed and the colliding bodies optimization algorithm is employed to find optimum seismic design of frame structures. Two numerical examples from the literature are studied. The results of the new algorithm are compared to the conventional design methods to show the power or weakness of the algorithm.

A Hybrid Optimization Method Research for Aeroengine Performance Seeking Control

2006 ◽  
Author(s):  
Yu-Bin Zhu ◽  
Si-Qi Fan ◽  
Xiu-Hua Zhang ◽  
Hua-Cong Li
Keyword(s):  
Linear Programming ◽  
Performance Optimization ◽  
Hybrid Algorithm ◽  
Optimization Problems ◽  
Engine Performance ◽  
Optimization Method ◽  
Pattern Search ◽  
Hybrid Optimization ◽  
Nonlinear Method ◽  
Hybrid Optimization Method

According to the optimization control modes of performance seeking control (PSC) in aeroengine, the aeroengine performance optimization problems which were described as a linear programming problem are studied. In respect that the linear programming is only guaranteed to converge to a local minimized and nonlinear method is much more computation, a hybrid algorithm based on linear programming (LP) and Model-Assisted Pattern Search (MAPS) is provided in this paper. And the hybrid optimization method is used for aeroengine control. Digital simulations are conduced in maximum thrust mode and minimum fuel mode in this paper. Simulation results demonstrate that the engine performance can be improved further and calculation time can be reduced rapidly by using hybrid algorithm.

Study of Performance Levels of Masonry Buildings Based on Damage

2012 ◽  
Vol 226-228 ◽  
pp. 1115-1118
Author(s):  
Wei Liu ◽  
Peng Xu ◽  
Bo Zhang
Keyword(s):  
Damage Evolution ◽  
Comprehensive Evaluation ◽  
Pushover Analysis ◽  
Damage Index ◽  
Masonry Buildings ◽  
Performance Levels ◽  
Damage Evolution Equation ◽  
Performance Based Seismic Design ◽  
Earthquake Action ◽  
Strain Space

Performance levels in performance-based seismic design are affected by many factors. In this paper, based on the unclear division of the performance levels, finite element models of masonry buildings with windows of different sizes and different structural measures, according to damage constitutive equation of masonry in strain space and damage evolution equation [1], are built, which are analysed by the pushover analysis method. Stiffness change and damage evolution of masonry buildings under earthquake action are quantitatively described by the basic damage index and holistic damage index. In order to show their joint action on seismic performance of masonry buildings, the comprehensive evaluation coefficient is suggested to divide and evaluate performance levels of masonry buildings, which can evaluate overall seismic behavior of masonry buildings.

scholarly journals Seismic design of a super-tall building: Indonesian experience

2020 ◽  
Vol 156 ◽  
pp. 05020
Author(s):  
Davy Sukamta ◽  
Nick Alexander
Keyword(s):  
Seismic Design ◽  
Concrete Slab ◽  
Pushover Analysis ◽  
Critical Factor ◽  
Steel Beams ◽  
History Analysis ◽  
Seismic Design Code ◽  
Response History Analysis ◽  
Performance Based Seismic Design ◽  
Under Construction

This paper summarizes the structural concept and design of the twin 303-meter high “Indonesia-1" supertall building currently under construction in Jakarta. The first tower is a 63-story office building, and the second is 59-story, on top of the seven-level basement structure. The lateral resisting system of the towers is RC core-wall and outrigger, and composite floor system - with concrete slab, metal deck, and steel beams - is used for the gravity resisting system. Since the lateral system is outside the scope of the prescriptive system in the Indonesian Seismic Design Code, Modal Pushover Analysis (MPA) combined with Non-linear Response History Analysis (NLRHA) had demonstrated acceptability to the Jakarta building department and its peer review panel. Some challenges in conducting Performance-based Seismic Design (PBSD) are highlighted. In order to speed up construction, which is a critical factor in supertall building construction, erection columns are installed in the RC columns and CSPCM (Core Structure Preceding Construction Method) is applied. Consistently, the design must account for the associated construction sequence.

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