Seismic Performances of Buckling-Restrained Braced Steel Frames in China, Japan and US

2014 ◽  
Vol 1065-1069 ◽  
pp. 1106-1111
Author(s):  
Mei Ling Huang ◽  
Zhao Yu Fu ◽  
En He Bao
Keyword(s):  
United States ◽  
Seismic Design ◽  
Design Method ◽  
Plastic Hinge ◽  
The United States ◽  
Steel Frame ◽  
Frame Structure ◽  
Main Research ◽  
Force Sharing ◽  
Steel Consumption

Buckling-Restrained Brace (BRB) in China, Taiwan, and Japan, as a kind of hysteretic damper has been installed into steel frame structure; In the United States, however, it has been installed into the hinge-connected steel framework, as the main seismic element in order to add lateral stiffness and strength.This paper according to the design codes of frame structure in China, Japan and the United States,establishes the research model based 0n the typical steel frame form of China, Japan, and the US.The main research parameters of the model are horizontal force sharing ratio of BRB (β) and frame strength of BRB (CB)。Through the steel consumption,the relationship of story drift and story shear, the formation of plastic hinge of the design model,it compares the steel frame seismic design method of China, Japan and the United States.The steel consumption of frame is related to the strength of the frame, but has nothing to do with the frame structure form;The plastic hinge of each model focused mainly on the BRB,reflecting the overall mechanism; As to seismic design requirements, the Japanese codes are stricter, codes of China and the United States is relatively close.

Performance Goal-Based Seismic Design Standards for Critical Facilities in the United States

2003 ◽  
Author(s):  
Quazi A. Hossain
Keyword(s):  
United States ◽  
Seismic Design ◽  
Functional Performance ◽  
Design Method ◽  
The United States ◽  
Department Of Energy ◽  
Performance Goals ◽  
United States Department ◽  
Active Member ◽  
Performance Goal

For more than the last fifteen years, the United States Department of Energy (DOE) has been using a probabilistic performance goal-based seismic design method for structures, systems, and components (SSCs) in its nuclear and hazardous facilities. Using a graded approach, the method permits the selection of probabilistic performance goals or acceptable failure rates for SSCs based on the severity level of SSC failure consequences. The method uses a site-specific probabilistic seismic hazard curve as the basic seismic input motion definition, but utilizes the existing national industry consensus design codes for specifying load combination and design acceptance criteria in such a way that the target probabilistic performance goals are met. Recently, the American Nuclear Society (ANS) and the American Society of Civil Engineers (ASCE) have undertaken the development of a number of national consensus standards that will utilize the performance goal-based seismic design experience base in the DOE complex. These standards are presently in various stages of development, some nearing completion. Once completed, these standards are likely to be adopted by various agencies and organizations in the United States. In addition to the graded approach of DOE’s method, these standards incorporate design provisions that permit seismic design of SSCs to several levels of functional performance. This flexibility of choosing a functional performance level in the design process results in an optimum, but risk-consistent design. The paper will provide an outline of two of these standards-in-progress and will present the author’s understanding of their basic philosophies and technical bases. Even though the author is an active member of the development committees for these two standards, the technical opinions expressed in this paper are author’s own, and does not reflect the views of any of the committees or the views of the organizations with which any member of the committees are affiliated.

Displacement-Based Seismic Design Method of Steel Moment Frame

2012 ◽  
Vol 166-169 ◽  
pp. 640-644
Author(s):  
Qian Zhang ◽  
Ya Feng Yue ◽  
Ergang Xiong
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Steel Frame ◽  
Frame Structure ◽  
Moment Frame ◽  
Steel Moment Frame ◽  
Displacement Based ◽  
Seismic Design Method ◽  
Steel Frame Structure ◽  
Displacement Based Seismic Design

According to lots of documents previously studied, a seismic design method is put forward based on displacement for steel moment frame. This method is established in condition that the yield displacement of steel frame can be determined by its geometrical dimension; then the objective displacement (ultimate displacement) can be determined in light of performance level of the structure, and the corresponding coefficient of ductility can be obtained. Thereafter, the design base shear of steel frame structure can be calculated by the use of reduced elastic spectrum. Thus, the design of stiffness and capacity can be conducted on steel frame structure. The analysis of case study indicates that the displacement-based seismic design method addressed herein is of reasonable safety and reliability, and of operational convenience, which can still realize the seismic design of steel frame structure at different performance levels.

Experimental Research and Finite Element Analysis on Behavior of Steel Frame with Semi-Rigid Connections

2010 ◽  
Vol 168-170 ◽  
pp. 553-558
Author(s):  
Feng Xia Li ◽  
Bu Xin
Keyword(s):  
Architectural Design ◽  
Plastic Hinge ◽  
Steel Frames ◽  
Seismic Energy ◽  
Internal Force ◽  
Steel Frame ◽  
Frame Structure ◽  
Element Analysis ◽  
Rigid Deformation ◽  
Steel Frame Structure

Most steel beam-column connections actually show semi-rigid deformation behavior that can contribute substantially to overall displacements of the structure and to the distribution of member forces. Steel frame structure with semi-rigid connections are becoming more and more popular due to their many advantages such as the better satisfaction with the flexible architectural design, low inclusive cost and environmental protect as well. So it is very necessary that studying the behavior of those steel frame under cyclic reversal loading. On the basics of connections experiments the experiment research on the lateral resistance system of steel frame structure has been completed. Two one-second scale, one-bay, two-story steel frames with semi-rigid connections under cyclic reversal loading. The seismic behavior of the steel frames with semi-rigid connections, including the failure pattern, occurrence order of plastic hinge, hysteretic property and energy dissipation, etc, was investigated in this paper. Some conclusions were obtained that by employing top-mounted and two web angles connections, the higher distortion occurred in the frames, and the internal force distributing of beams and columns was changed, and the ductility and the absorbs seismic energy capability of steel frames can be improved effectively.

Seismic Design of Highway Bridges in the United States

1980 ◽  
Vol 106 (1) ◽  
pp. 13-27
Author(s):  
Roland L. Sharpe ◽  
Ronald L. Mayes ◽  
James D. Cooper
Keyword(s):  
United States ◽  
Seismic Design ◽  
Highway Bridges ◽  
The United States

Seismic Design Requirements for Regions of Moderate Seismicity

2000 ◽  
Vol 16 (1) ◽  
pp. 205-225 ◽  
Author(s):  
Guy J. P. Nordenson ◽  
Glenn R. Bell
Keyword(s):  
United States ◽  
Seismic Design ◽  
Soft Soil ◽  
The United States ◽  
Mitigation Measures ◽  
Quarter Century ◽  
Seismic Codes ◽  
The Past ◽  
Moderate Seismicity ◽  
High Seismicity

The need for earthquake-resistant construction in areas of low-to-moderate seismicity has been recognized through the adoption of code requirements in the United States and other countries only in the past quarter century. This is largely a result of improved assessment of seismic hazard and examples of recent moderate earthquakes in regions of both moderate and high seismicity, including the San Fernando (1971), Mexico City (1985), Loma Prieta (1989), and Northridge (1994) earthquakes. In addition, improved understanding and estimates of older earthquakes in the eastern United States such as Cape Ann (1755), La Malbaie, Quebec (1925), and Ossippe, New Hampshire (1940), as well as monitoring of micro-activity in source areas such as La Malbaie, have increased awareness of the earthquake potential in areas of low-to-moderate seismicity. Both the hazard and the risk in moderate seismic zones (MSZs) differ in scale and kind from those of the zones of high seismicity. Earthquake hazards mitigation measures for new and existing construction need to be adapted from those prevailing in regions of high seismicity in recognition of these differences. Site effects are likely to dominate the damage patterns from earthquakes, with some sites suffering no damage not far from others, on soft soil, suffering near collapse. A number of new seismic codes have been developed in the past quarter century in response to these differences, including the New York City (1995) and the Massachusetts State (1975) seismic codes. Over the same period, the national model building codes that apply to most areas of low-to-moderate seismicity in the United States, the Building Officials and Code Administrators (BOCA) Code and the Southern Standard Building Code (SSBC), have incorporated up-to-date seismic provisions. The seismic provisions of these codes have been largely inspired by the National Earthquake Hazard Reduction Program (NEHRP) recommendations. Through adoption of these national codes, many state and local authorities in areas of low-to-moderate seismicity now have reasonably comprehensive seismic design provisions. This paper will review the background and history leading up to the MSZ codes, discuss their content, and propose directions for future development.

Seismic Displacement Design Method Comparison between Chinese, American, European and Japanese Seismic Design Codes

2013 ◽  
Vol 859 ◽  
pp. 43-47
Author(s):  
Gui Ming Zhang ◽  
Wen Feng Liu ◽  
Zhi Hong Chen
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Method Comparison ◽  
Chinese American ◽  
Frame Structure ◽  
Design Codes ◽  
Reinforced Concrete Frame ◽  
Seismic Displacement ◽  
Story Drift ◽  
Earthquake Action

Seismic displacement design method and allowable values of story drift are compared between Chinese, American, European and Japanese seismic design codes. An engineering example's seismic displacement is calculated in the methods given by the four codes, and story drift are compared. Researches show that allowable story drift of Chinese code under rare earthquake action is approximately close to that of American with a 10% probability of exceedance in 50 years, and allowable story drift of Japanese code is more rigorous than other three codes. For three-story three-span reinforced concrete frame structure, in the condition of same intensity, displacement of Chinese under the earthquake action with 2~3% exceeding probability of 50-year is greater than that of American and European with 10% exceeding probability of 50-year. However, intensity plays no role in Japan's displacement calculation, and the calculation result of displacement of Japanese code is less than other three codes.

Comparative Law in a Civil Society

1996 ◽  
Vol 24 (3) ◽  
pp. 263-269
Author(s):  
Kersi B. Shroff
Keyword(s):  
United States ◽  
Civil Society ◽  
Comparative Law ◽  
The United States ◽  
Legal Issues ◽  
United States Congress ◽  
Legal Systems ◽  
Library Of Congress ◽  
Main Research ◽  
Law Library

The main research responsibility of the Law Library of Congress is to serve as the research arm of the United States Congress for the study of the legal systems of other countries. The studies, reports, and briefings its specialists prepare provide a worldwide perspective to the Congress on particular legal issues. This type of work can generally be described as comparative law research.

Lattice Light Steel Frame System and Application

2011 ◽  
Vol 105-107 ◽  
pp. 1110-1113
Author(s):  
Bo Ding ◽  
Huan Qing Jiang ◽  
Hong Xia Wan ◽  
Feng Zhang
Keyword(s):  
High Speed ◽  
Design Method ◽  
Calculation Model ◽  
Steel Frame ◽  
Calculation Results ◽  
Frame System ◽  
Practical Engineering ◽  
Steel Consumption ◽  
New Type ◽  
New System

Lattice light steel frame is a new type of structural system, combining general steel framework which is composed of lattice column and lattice beam with lattice light steel keel of the partitions and floors, the system takes full advantages of both structural systems, with high speed construction, less steel consumption, good earthquake-resistance etc., and possesses good prospects. The paper describes the system construction approach and the characteristics of lattice light steel frame system, and provides a project example of a villa. The design method and calculation model of the project are presented. Calculation results meet the specifications’ requirements, proving the new system can be applied to practical engineering. The paper gives guidance for application and research of this new system.

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