Optimized Damping Device Configuration Design of a Steel Frame Structure Based on Building Performance Indices

2004 ◽  
Vol 20 (1) ◽  
pp. 67-89 ◽  
Author(s):  
Wei Liu ◽  
Mai Tong ◽  
Yihui Wu ◽  
George C. Lee
Keyword(s):  
Performance Index ◽  
Dynamic Properties ◽  
Frame Structure ◽  
Building Performance ◽  
Building Structures ◽  
Existing Building ◽  
Story Drift ◽  
Current Design ◽  
Energy Dissipation Devices ◽  
Steel Frame Structure

Energy dissipation devices (EDDs) have been accepted as one of the viable strategies for enhancing the seismic performance of building structures. However, the current design provisions do not provide guidelines for optimizing the EDD configurations on structures. For many building structures an efficient configuration of EDDs may provide considerable performance improvement. Similarly, an optimized configuration may reduce the number of EDDs required to achieve a target performance objective. In this paper an existing building with added linear viscous dampers is redesigned based on different performance index optimization. The results indicate that the optimal device configurations are highly related to the dynamic properties of the structure and its required performance index. In one instance, where the cost is the major concern and a performance requirement is placed on story drift limitation, the total device damping coefficient can be reduced by 26%.

Evolution of Design Code Requirements for Exterior Elements and Connections

2005 ◽  
Vol 21 (1) ◽  
pp. 213-224 ◽  
Author(s):  
Brian J. Sielaff ◽  
Richard J. Nielsen ◽  
Edwin R. Schmeckpeper
Keyword(s):  
Precast Concrete ◽  
Lateral Force ◽  
Frame Structure ◽  
Building Code ◽  
Seismic Zone ◽  
Seismic Rehabilitation ◽  
Story Drift ◽  
Moment Resisting ◽  
Design Requirements ◽  
Steel Frame Structure

Seismic design requirements for precast concrete cladding panel connections have evolved significantly over the past fifty years. This paper summarizes the pertinent requirements from the Uniform Building Code from 1967 to 1997, and the International Building Code 2000. A hypothetical design illustrates how emphasis in the code has evolved for both lateral force requirements and story drift displacement requirements arriving at a balance of moderate lateral force and displacement requirements. The numerical results are based on a hypothetical case of panel connections for a ten-story moment-resisting steel frame structure built in seismic Zone 4. This historical summary is of value to designers who deal with the seismic rehabilitation of precast panel connections.

Seismic Behavior Study of External Wall Panels in Steel Frames

2011 ◽  
Vol 243-249 ◽  
pp. 1425-1428 ◽  
Author(s):  
Ming Ji Fang
Keyword(s):  
Shaking Table Test ◽  
Dynamic Properties ◽  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
External Wall ◽  
Behavior Study ◽  
Wall Panels ◽  
Seismic Behaviors ◽  
Steel Frame Structure

The shaking table test of a full-scale steel frame structure with ALC external wall panels is performed in this paper. Based on the experimental results, the seismic behaviors of ALC external walls and joints are studied, such as the destruction properties of ALC external walls and joints and the effects of external walls on the dynamic properties of steel frame. Several useful conclusions and suggestions are presented in the paper.

Stairs Effect on Steel Frame Structure under Seismic Loading

2014 ◽  
Vol 1065-1069 ◽  
pp. 1245-1248
Author(s):  
Zhuo Jun Zeng ◽  
Jun Ping Wang ◽  
Yan Xiang Li
Keyword(s):  
Seismic Loading ◽  
Structure Design ◽  
Steel Frame ◽  
Frame Structure ◽  
Vibration Period ◽  
Finite Element Software ◽  
Story Drift ◽  
Article Analysis ◽  
Steel Frame Structure ◽  
The Impact

This article analysis stairs effect on steel frame structure under seismic loading by using the finite element software MIDAS Gen. Detailed analyzing impact of stairs on the self-vibration period, period ratio, the story drift and other design indexes in designing of the impact under seismic loading. Analysis shows that stairs have great effects on the design index of steel frame structure. Therefore the stair effect must be considered in analysis of structure design and modeling.

Shaking Table Test of Steel Frame Structure in Sine-Swept Vibration and its Virtual Realization

2013 ◽  
Vol 454 ◽  
pp. 204-208
Author(s):  
Hong Biao Liu ◽  
Qiang Zhang ◽  
Xian Peng Liu
Keyword(s):  
Shaking Table Test ◽  
Dynamic Properties ◽  
Structural Response ◽  
Time Domain Analysis ◽  
Steel Frame ◽  
Shaking Table ◽  
Frame Structure ◽  
The Difference ◽  
Dynamic Time ◽  
Steel Frame Structure

The accurate sine-swept function is proposed by theoretic derivation. The natural frequencies of five-story steel frame structure in transverse direction were identified by modal test. Based on the numerical simulation results of steel frame structure excited by sine-swept vibration, it is proved that the difference of structural response between forward excitation and backward excitation is little,and both the results of them can be used to evaluate the dynamic property of structure. However, it is proper to decide whether the response results of structure should be modified or not based on the dynamic properties of table-board. The conclusions above can provide basis for design and dynamic time-domain analysis of shaking table test in sine-swept excitation.

Estimation Theory on Cable’s Diameter in Pre-Stressed Mega Brace and Steel Frame Structure

2011 ◽  
Vol 94-96 ◽  
pp. 310-315 ◽  
Author(s):  
Sheng Gu ◽  
Bai Jian Tang ◽  
Jian Hua Shao
Keyword(s):  
Cross Section ◽  
Superposition Principle ◽  
Deformation Mode ◽  
Estimation Theory ◽  
Steel Frame ◽  
Frame Structure ◽  
Cross Section Area ◽  
Section Area ◽  
Story Drift ◽  
Steel Frame Structure

According to the superposition principle of building structure, the lateral deformation mode of pre-stressed mega bracing-steel frame structure was analyzed, then the relation between the structural maximum inter-story drift and cross section area of cable was further established. Based on the area of cable derived by the design target value of inter-story drift, the qualitative estimation theory on cross section area of the cable is finally determined.

Computational Analysis of the Forces Distribution in a Metal Frame Structure Taking into Account Plastic Deformations of the Material

2021 ◽  
pp. 137-145
Author(s):  
В. С. Варнавский ◽  
Г. Е. Габриелян ◽  
В. В. Востриков
Keyword(s):  
Static Load ◽  
Operating Conditions ◽  
Frame Structure ◽  
Building Structures ◽  
Structural Failure ◽  
Plastic Properties ◽  
Loading Method ◽  
Flat Steel ◽  
Metal Frame ◽  
Steel Frame Structure

Постановка задачи. С целью снижения материалоемкости строительных конструкций нормативные документы рекомендуют учитывать пластические свойства стали в прочностных расчетах. Это требует развития соответствующих методов расчета с применением современного программного обеспечения. Результаты. Усовершенствована методика расчета плоского стального рамного каркаса на статическую нагрузку на основе принципа предельного равновесия с применением программно-вычислительного комплекса «ЛИРА». Исследован поэтапный характер разрушения конструкции при воздействии сверхнормативных нагрузок. Выводы. Показано, что применение пошагового метода нагружения позволяет моделировать поведение конструкции в ходе увеличения нагрузки. Проведенные исследования позволяют давать верхнюю оценку максимально возможной нагрузки, возникающей в исключительных условиях эксплуатации. Statement of the problem. In order to reduce the material consumption of building structures, in regulatory documents it is recommend that the plastic properties of steel in strength calculations are taken into account. This requires the development of appropriate calculation methods by means of modern software. Results. The method of calculating a flat steel frame structure for static load based on the principle of limiting equilibrium using the design-computational complex LIRA has been improved. The gradual nature of structural failure under the influence of excessive loads is studied. Conclusions. It is shown that the application of the step-by-step loading method makes it possible to model the behavior of the structure during an increase in load. The studies allow us to provide an upper estimation of the maximum possible load that occurs under exceptional operating conditions.

scholarly journals Viscoelastic Material as Energy Dissipater Viscoelastic Damper for Building Structures to Mitigate the Seismic Vibration

2019 ◽  
Vol 29 (2) ◽  
pp. 41-49
Author(s):  
Waseem Sarwar
Keyword(s):  
Viscoelastic Material ◽  
Performance Index ◽  
Dynamic Properties ◽  
Loss Modulus ◽  
Excitation Frequency ◽  
Structural Response ◽  
Mechanical Analysis ◽  
Building Structures ◽  
Seismic Vibration ◽  
Viscoelastic Dampers

Abstract The supplemental energy dissipation system is a practical approach to attenuate the structural response under extreme loading. Viscoelastic damping used to reinforce the structure against the seismic vibration, Viscoelastic material (VEM) most commonly used in viscoelastic dampers (VEDs). In this paper, dynamic mechanical analysis (DMA) approach is used to investigate the performance index of VEM. It is demonstrated that the performance index, such as storage modulus, loss modulus, and loss factor decrease noticeably as the temperature increases, which reflects the low stiffness at high temperature. Excitation frequency also influenced the performance index, and the reaction has correspondence to temperature. As the temperature increases, the VEM dynamic properties decreases, which represents the rubbery region, and it is found that higher to low-temperature dynamic properties increases, which the glassy region is. DMA is a particularly flexible approach, and it characterizes the properties of VEM simultaneously at various conditions.

scholarly journals Shaking Table and Numerical Seismic Performance Evaluation of a Fluid Viscous-Dissipative Bracing System

2012 ◽  
Vol 28 (4) ◽  
pp. 1619-1642 ◽  
Author(s):  
Stefano Sorace ◽  
Gloria Terenzi ◽  
Fabio Fadi
Keyword(s):  
Shaking Table ◽  
Frame Structure ◽  
Building Performance ◽  
Seismic Performance Evaluation ◽  
Damping Coefficients ◽  
Final Performance ◽  
Interstory Drift ◽  
Protection Technology ◽  
Bracing System ◽  
Steel Frame Structure

A shaking table campaign was carried out on a 2:3-scale, two-story steel frame structure retrofitted by a dissipative bracing system incorporating pressurized fluid viscous spring-dampers. Up to 1.16 g peak ground accelerations were imposed in the most severe of the 33 tests developed. The response was always elastic, with maximum interstory drift ratios limited below 0.62%. The protection technology, in fact, features high dissipative capacities and produced equivalent linear viscous damping coefficients up to 37.5%. A numerical enquiry carried out on the test structure in its original unbraced configuration showed interstory drift reductions from about 80% to about 90% when passing to dissipative braced conditions. A final performance-based analysis developed in terms of interstory drifts and beam and column rotations, in compliance with the criteria formulated in ASCE/SEI 41-06 Standard, emphasized three through five enhancements of building performance in retrofitted conditions for the four earthquake levels examined.

Statistical Analyses of Steel Frame Structure Drift Angle

2012 ◽  
Vol 204-208 ◽  
pp. 1102-1108
Author(s):  
Huan Huan Xia ◽  
Wen Feng Liu ◽  
Yan Qiang Gao
Keyword(s):  
Seismic Performance ◽  
Test Data ◽  
Steel Frame ◽  
Statistical Analyses ◽  
Frame Structure ◽  
Limit Values ◽  
Drift Angle ◽  
Performance Levels ◽  
Story Drift ◽  
Steel Frame Structure

Story drift angle is one of the main indexes to test the seismic performance of building structures. American seismic code of buildings FEMA273/274 respectively provide the limit values of story drift angle in two kinds structural systems, steel frame and steel-support frame. This article collects 40 groups steel frame test data and 24 groups steel-support frame test data. By the statistical analyses of story drift angle and the comparison to the drift angle limit values in different countries, the seismic performance levels of steel frame structure are divided into six,Ⅰ,Ⅱ,Ⅲ,Ⅳ,Ⅴand Ⅵ, and the suggested limit values of story drift angle corresponding with performance levels are given.

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