Expected Seismic Behavior of Older Steel Structures

1996 ◽  
Vol 12 (4) ◽  
pp. 805-821
Author(s):  
Charles W. Roeder ◽  
Roberto Leon ◽  
F. Robert Preece
Keyword(s):  
Seismic Behavior ◽  
Potential Problem ◽  
Research Study ◽  
Steel Structures ◽  
Valuable Insight ◽  
Structural System ◽  
Joint Research ◽  
Research Results ◽  
Seismic Rehabilitation ◽  
Extensive Research Program

Older steel structures frequently require seismic rehabilitation, but the inelastic seismic behavior of these older structures is not well understood. A joint research study between the U. of Washington, U. of Minnesota, and Preece/Goudie and Associates examined this behavior. The study included experimental and analytical studies, and this paper is an overview of the research and the more important research results. It provides a concise summary of the rather extensive research program, and the research results are correlated to real structural behavior. This correlation includes evaluation and comparison with behavior observed during past earthquakes. The paper will help the reader understand the performance of the total structural system will provide valuable insight for engineers starting a repair or retrofit project, and it will isolate potential problem areas to be considered in rehabilitation projects.

EXPRESS: Toward Temporally Complex Collaboration in an Interorganizational Research Network

2021 ◽  
pp. 147612702110429
Author(s):  
Sirkka L Jarvenpaa ◽  
Liisa Valikangas
Keyword(s):  
Academic Research ◽  
Research Network ◽  
Interorganizational Networks ◽  
Agile Method ◽  
Joint Research ◽  
Research Results ◽  
Business Ecosystems ◽  
Narrative Time ◽  
Collective Benefit

Prior research suggests interorganizational collaboration faces temporal challenges but also opportunities yet is scarce on the role of time enabling – more often deterring - collaboration for collective benefit. Our contribution is highlighting how a large industry-academic research network developed temporally complex collaboration through varying temporal rules and relationships. The three network-developed collaborative repertoires, with their particular temporal rules and relationships, complemented the externally imposed calendar repertoire: (1) sprint repertoire, following a familiar agile method for joint research, (2) narrative time repertoire, enabling sharing research results across various events at the program level, and (3) “right” time repertoire that turned research results into action in emerging business ecosystems. With these collaborative repertoires, both the temporal diversities of home organizations and the asynchronies of the network activities were resolved for collective benefit. We contribute to the intersection of the literatures on interorganizational networks and temporality as befitting collaboration.

Review of Research on the Seismic Behavior of Integral Prefabricated Prestressed Concrete Slab-Column Structure

2013 ◽  
Vol 831 ◽  
pp. 176-180 ◽  
Author(s):  
Li Li Wu ◽  
Ya Can Cui ◽  
Rong Bin Zhou ◽  
Jia Qing Shi ◽  
Peng He ◽  
...  
Keyword(s):  
Research Methods ◽  
Seismic Performance ◽  
Prestressed Concrete ◽  
Seismic Behavior ◽  
Concrete Slab ◽  
Research Priorities ◽  
Structural System ◽  
Column Structure

The integral prefabricated prestressed concrete slab-column structure was a new structural system introduced to China in 1980s. The structure has a series of obvious advantages and the scholars focus research priorities on its seismic performance. The research methods and developments of seismic behavior of the slab-column structure are summarized, and some measures are also put forward to improve the seismic behavior.

Performance Based Optimized Design of Steel Structure

2014 ◽  
Vol 919-921 ◽  
pp. 199-202
Author(s):  
Lan Lan Zhang ◽  
Xiao Guang Song ◽  
Jing Juan Zhang
Keyword(s):  
Optimization Design ◽  
Design Principle ◽  
Steel Structure ◽  
Steel Structures ◽  
Construction Cost ◽  
Optimized Design ◽  
Structural System ◽  
Sizing Optimization ◽  
The Past ◽  
Whole Process

During the past two centuries, steel structure has become one of the most popular structural system. How to balance the construction cost, structural properties and other factors is an important aspect needed to be addressed. This paper describes the whole process of performance based optimized design of steel structure. First, the methods on the shape and sizing optimization, cost and others are introduced. Then, the multi-object optimization of steel structure is presented, in which the main aspects of the optimizations are studied. Finally, the design principle and the analytical steps for the multi-object optimization of steel structures are discussed. This paper can be references for the optimization design of steel structures.

Modeling and Parametric Study of Cover Plate Strengthen-Beam Flange Weaken Beam-to-Column Connection for Steel Moment Frame

2011 ◽  
Vol 368-373 ◽  
pp. 1217-1221
Author(s):  
Yan Xia Zhang ◽  
Yun Peng Li ◽  
Lu Yao Wang ◽  
Fan Yang
Keyword(s):  
Finite Element ◽  
Parametric Study ◽  
Seismic Behavior ◽  
Steel Structures ◽  
Cover Plate ◽  
Finite Element Analyses ◽  
Moment Frame ◽  
Steel Moment Frame ◽  
Theoretical Analyses

Based on the previous experiments and theoretical analyses, finite element analyses (FEA) and parametric study on seismic behavior of Cover Plate Strengthen-Beam Flange Weaken Beam-to-Column (CPSBFW) connection are executed by using ABAQUS. Suggestions on design conceptions and details of the cover plate strengthen-beam flange weaken beam-to-column connection are presented in this paper, and that provide valuable reference for design of beam-to-column connections in steel structures.

scholarly journals A Study on the Effects of Vertical Mass Irregularity on Seismic Behavior of BRBFs and CBFs

2020 ◽  
Vol 10 (23) ◽  
pp. 8314
Author(s):  
Armin Karami ◽  
Shahrokh Shahbazi ◽  
Mahdi Kioumarsi
Keyword(s):  
Urban Areas ◽  
Seismic Behavior ◽  
Steel Structures ◽  
Mean Value ◽  
Far Field ◽  
Braced Frames ◽  
Regular Structures ◽  
Irregular Structures ◽  
The Mean ◽  
Economic Constraints

Today, architectural application and economic constraints require that vertical-irregular structures be constructed in urban areas. Proposing methods to minimize damage to these structures during earthquakes is therefore crucial. Strict regulations have been enforced for the design and analysis of irregular structures given their higher vulnerability to damage compared to that of regular structures. The present study aimed to evaluate eight regular and irregular 10-story and 15-story steel structures with buckling-restrained braces frames (BRBFs) and concentric braced frames (CBFs) in terms of their responses to twelve far-field earthquakes. According to the obtained results, the mean value of maximum drift, top floor displacement and floor acceleration were higher in both regular and irregular structures with BRBFs than in those with CBFs.

Seismic behavior of structures considering uplift and soil–structure interaction

2017 ◽  
Vol 20 (11) ◽  
pp. 1712-1726
Author(s):  
Farhad Behnamfar ◽  
Seyyed Mohammad Mirhosseini ◽  
Hossein Alibabaei
Keyword(s):  
Seismic Behavior ◽  
Soil Structure ◽  
Nonlinear Dynamic Analysis ◽  
Steel Structures ◽  
Soil Structure Interaction ◽  
Structure Interaction ◽  
Nonlinear Seismic Response ◽  
Tensile Forces ◽  
Fixed Base ◽  
Flexible Base

A common assumption when analyzing a structure for earthquake forces is that the building is positively attached to a rigid ground so that it can sustain possible tensile forces without being detached, or uplifted, from its bearing points. Considering the facts that almost no tension can be transferred between a surface foundation and soil and soft soils interact with the supported structure during earthquakes, in this research, the effects of uplift and soil–structure interaction on nonlinear seismic response of structures are evaluated. Several reinforced concrete and steel structures under different suits of consistent ground motions are considered. The base of the buildings is modeled with vertical no-tension springs being nonlinear in compression. The total soil–structure interaction system is modeled within OpenSees, and the seismic behavior is evaluated using a nonlinear dynamic analysis. The nonlinear responses of buildings are determined and compared between three cases: fixed base, flexible base without uplift, and flexible base with uplift. The cases for which uplift in conjunction with soil–structure interaction should be considered are identified.

Contemporary Development of Research Cooperation in University — Industry Relations in Japan

2000 ◽  
Vol 14 (1) ◽  
pp. 17-23 ◽  
Author(s):  
Masateru Baba ◽  
Takao Kamibeppu
Keyword(s):  
Intellectual Property Rights ◽  
Research Funding ◽  
Higher Learning ◽  
Joint Research ◽  
Research Results ◽  
Institutions Of Higher Learning ◽  
Contemporary Development ◽  
Industry Relations ◽  
University Industry ◽  
Economic Foundations

This paper reveals how cooperation between universities and industry in Japan has developed and what issues have been faced in the development of this relationship. Both sides agree that a positive and constructive relationship between universities and industry is vital because any nation that does not have the support of institutions of higher learning cannot sustain itself, and, similarly, healthy higher education institutions cannot sustain themselves without solid economic foundations. University–industry cooperation has only recently begun in Japan, and it includes joint research, commissioned research, exchange of researchers, acceptance of research funding, among other things. The two major resources for research are people (intellectual resources) and money (funding). The efficiency of research results depends on how effective a balance is achieved between the distribution of these two resources. The exchange of intellectual resources effects the transfer of research results from universities to industry. Various devices for promoting cooperation also have an impact on university finances. As a result of these mechanisms, issues such as intellectual property rights and the diversification of university finances at national universities in particular will have to be addressed.

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