Design of Nonstructural Systems and Components

1989 ◽  
pp. 387-412
Author(s):  
Thomas A. Sabol
Keyword(s):  
Nonstructural Systems

Piping Fragility Evaluation: Interaction With High-Rise Building Performance

2016 ◽  
Vol 139 (3) ◽  
Author(s):  
Bu Seog Ju ◽  
Abhinav Gupta ◽  
Yong Hee Ryu
Keyword(s):  
Fragility Curves ◽  
Element Model ◽  
System Level ◽  
Building Performance ◽  
Ground Acceleration ◽  
High Rise ◽  
High Rise Building ◽  
Nonstructural Systems ◽  
Critical Facilities ◽  
Nonlinear Finite Element Model

Many recent studies have emphasized the need for improving seismic performance of nonstructural systems in critical facilities in order to reduce the damage as well as to maintain continued operation of the facility after an earthquake. This paper is focused on evaluating system-level seismic fragility of the piping in a representative high-rise building. Piping fragilities are evaluated by incorporating the nonlinear finite-element model of a threaded Tee-joint that is validated using experimental results. The emphasis in this study is on evaluating the effects of building performance on the piping fragility. The differences in piping fragility due to the nonlinearities in building are evaluated by comparing the fragility curves for linear frame and nonlinear fiber models. It is observed that as nonlinearity in the building increases with increasing value of peak ground acceleration, the floor accelerations exhibit a reduction due to degradation/softening. Consequently, the probabilities of failure increase at a slower rate relative to that in a linear frame. It is also observed that a piping located at higher floor does not necessarily exhibits high fragilities, i.e., the fundamental building mode is not always the governing mode. Higher order building modes with frequencies closest to critical piping modes of interest contribute more significantly to the piping fragility. Within a particular building mode of interest, a good indicator of the amplification at different floor levels can be obtained by the product of mode shape ordinate and modal participation factor. Piping fragilities are likely to be higher at floor levels at which this product has a higher value.

Logic Tree Analysis of Secondary Nonstructural Systems with Independent Components

1999 ◽  
Vol 15 (3) ◽  
pp. 385-395 ◽  
Author(s):  
Christopher Roth
Keyword(s):  
Failure Probability ◽  
Fragility Curves ◽  
Secondary System ◽  
Logic Tree ◽  
Tree Analysis ◽  
Independent Components ◽  
Nonstructural Systems ◽  
Secondary Systems ◽  
The Way

The seismic performance of a nonstructural secondary system depends on the performance of each component of the system, and on the way in which the components are connected. The performance of each component is commonly described using fragility curves. Logic trees may be used to describe the way in which the components are connected. The use of logic tree analysis for secondary systems is briefly reviewed, and the method extended to allow the determination of the sensitivity of the system failure probability to the failure probability of any component of the system. An approximate method is proposed to find confidence intervals for the failure probability of the system, given uncertainty in the failure probability of each component. The method was found to give good results.

scholarly journals Risk assessment and retrofit of existing buildings

2000 ◽  
Vol 33 (3) ◽  
pp. 222-247
Author(s):  
William T. Holmes
Keyword(s):  
Risk Assessment ◽  
Earthquake Engineering ◽  
Global Analysis ◽  
Evaluation Process ◽  
Evaluation Procedure ◽  
Assessment And Evaluation ◽  
Response Characteristics ◽  
Nonstructural Systems ◽  
Structural Risk

The structural risk assessment and evaluation process is broken into the steps of Develop knowledge of as-built conditions, Determine local response characteristics, Create mathematical model, Perform global analysis, Determine acceptability, and Select retrofit procedure/Classify per evaluation procedure and each step discussed. These steps, in general, are major topics of their own and only a few of the primary engineering issues that affect the state of the art in this area are included in this paper. The development of conceptual retrofit schemes is also discussed. Many aspects of earthquake engineering are directly related to risk assessment and retrofit, including performance based engineering, characterization of seismic hazard, performance of nonstructural systems, costs of retrofit, and public policy. These subjects and their relationship to risk assessment and retrofit are briefly described.

Response of a 2-story test-bed structure for the seismic evaluation of nonstructural systems

2016 ◽  
Vol 15 (1) ◽  
pp. 19-29 ◽  
Author(s):  
Siavash Soroushian ◽  
E. “Manos” Maragakis ◽  
Arash E. Zaghi ◽  
Esmaeel Rahmanishamsi ◽  
Ahmad M. Itani ◽  
...  
Keyword(s):  
Test Bed ◽  
Seismic Evaluation ◽  
Nonstructural Systems

Laboratory Equipment: Estimating Losses and Mitigation Costs

2003 ◽  
Vol 19 (4) ◽  
pp. 779-797 ◽  
Author(s):  
Mary C. Comerio ◽  
John C. Stallmeyer
Keyword(s):  
Case Studies ◽  
Seismic Design ◽  
High Tech ◽  
Science Laboratory ◽  
Laboratory Equipment ◽  
Nonstructural Systems ◽  
Science Laboratories ◽  
Earthquake Loss ◽  
Mitigation Techniques ◽  
The University

The building code provides seismic design criteria for the structural and nonstructural systems in most building types, but there are no regulations to govern the installation of a building's contents. In certain building types, such as museums, libraries, high-tech fabrication facilities, and research laboratories, the contents are valuable or critical to operations, or both. This paper focuses on strategies for improving seismic performance for laboratory furnishings and equipment. A survey of science laboratories at the University of California, Berkeley, served as the basis for constructing a simplified taxonomy of laboratory equipment, mitigation designs, and cost estimates. Case studies of five laboratories in different disciplines, and one biological science laboratory building, demonstrate mitigation techniques and potential installation costs. The case studies also highlight the importance of considering the contents separately from the structural and nonstructural systems when developing vulnerability estimates for certain building types in earthquake loss modeling.

Lightweight Steel Constructions for Seismic Areas

2018 ◽  
Vol 763 ◽  
pp. 32-49
Author(s):  
Raffaele Landolfo
Keyword(s):  
State Of The Art ◽  
Seismic Performance Assessment ◽  
Shake Table Tests ◽  
Ongoing Research ◽  
Lightweight Steel ◽  
Critical Comparison ◽  
Research Activities ◽  
Nonstructural Systems ◽  
Research Themes ◽  
The University

Lightweight steel constructions are one of the innovative constructional systems steadily increasing in spread due to their huge benefits in respect to more traditional constructional systems. Typical lightweight steel products, usually combined with gypsum, wood and cement based panels, can be used to build both structural and nonstructural systems. After a brief description of the most common lightweight steel constructional systems, this paper describes the state of the art by focusing the attention on their behaviour under seismic actions. In particular, the main past and ongoing research themes are briefly summarised and a critical comparison among seismic codes available in North America, Europe and Oceania is presented. Finally, an overview of studies carried out on this topic at the University of Naples Federico II is presented and latest research activities involving the seismic performance assessment of both lightweight steel structural and nonstructural architectonic systems though shake-table tests is provided.

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