scholarly journals Seismic design of acceleration-sensitive non-structural elements in New Zealand: State-of-practice and recommended changes

2021 ◽  
Vol 54 (4) ◽  
pp. 243-262
Author(s):  
Muhammad Rashid ◽  
Rajesh Dhakal ◽  
Timothy Sullivan
Keyword(s):  
New Zealand ◽  
Seismic Design ◽  
Design Procedure ◽  
International Perspective ◽  
Eurocode 8 ◽  
Engineering Systems ◽  
Structural Elements ◽  
Seismic Loadings ◽  
Improved Design ◽  
Definition Of

Acceleration-sensitive non-structural elements not only constitute a significant portion of a building’s component inventory, but also comprise components and systems that are indispensable to the operational continuity of essential facilities. In New Zealand, Section 08 of the seismic loadings standard, NZS 1170.5: Earthquake Actions, and a dedicated standard, NZS 4219: Seismic Performance of Engineering Systems in Buildings, address the seismic design of non-structural elements. This paper scrutinizes the design provisions for acceleration-sensitive non-structural elements in NZS 1170.5 and NZS 4219, and provides an international perspective by comparing with the design provisions for non-structural elements specified in ASCE 7-16, the latest ATC approach and Eurocode 8. This is followed by a detailed discussion on the improvements required for component demand estimation, the need for design criteria that are consistent with performance objectives, definition of realistic ductility factors, and recommendations for the future way forward in the form of an improved design procedure and its application through a new seismic rating framework.

scholarly journals On the European Norms of Design of Buckling Restrained Braced Frames

2017 ◽  
Vol 11 (1) ◽  
pp. 513-530 ◽  
Author(s):  
Ádám Zsarnóczay ◽  
Tamás Balogh ◽  
László Gergely Vigh
Keyword(s):  
Seismic Design ◽  
Structural Reliability ◽  
Design Procedure ◽  
Material Model ◽  
Eurocode 8 ◽  
Braced Frames ◽  
Reliability Indices ◽  
Buckling Restrained Braces ◽  
Buckling Restrained Braced Frames ◽  
Ground Motion Records

The application of buckling restrained braced frames is hindered in Europe by the absence of a standardized design procedure in Eurocode 8, the European seismic design standard. The presented research aims to develop a robust design procedure for buckling restrained braced frames. A design procedure is proposed by the authors. Its performance has been evaluated for buckling restrained braced frames with two-bay X-brace type brace configurations using a state-of-the-art methodology based on the recommendations in the FEMA P695 document. A special numerical material model was developed within the scope of this research to represent the behavior of buckling restrained braces more appropriately in a numerical environment. A total of 24 archetype designs were prepared and their nonlinear dynamic response was calculated using real ground motion records in incremental dynamic analyses. Evaluation of archetype collapse probabilities confirms that the proposed design procedure can utilize the advantageous behavior of buckling restrained braces. Resulting reliability indices suggest a need for additional regulations in the Eurocodes that introduce reasonable structural reliability index limits for seismic design.

scholarly journals Evolution of EC8 Seismic Design Rules for X Concentric Bracings

Symmetry ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 1807
Author(s):  
Alessia Campiche ◽  
Silvia Costanzo
Keyword(s):  
Seismic Design ◽  
Structural Engineering ◽  
Design Procedure ◽  
Eurocode 8 ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Design Rules ◽  
Factor Ii ◽  
And Behavior ◽  
Seismic Area

Eurocodes are currently under revision within a six-year program by CEN/TC 250. In this framework, concentric bracings, particularly in cross configuration, have been largely debated; indeed, several criticisms affect the seismic design procedure currently codified within Eurocode 8, entailing significant design efforts and leading to massive and non-economical structural systems, even characterized by poor seismic behavior. The efforts of SC8 have been aimed at improving the codified seismic design criteria for concentrically braced frames, by providing requirements and detailing rules conceived to simplify the design process and to improve the seismic performance. The current paper provides recent advances in the field of computational and structural engineering focusing on symmetric X concentrically bracings in seismic area, outlining the evolution of Eurocode 8 (EC8) seismic design rules, by examining the following aspects: (i) ductility class and behavior factor, (ii) analysis and modelling aspects, (iii) design of dissipative members; (iv) design of non-dissipative zones; (v) brace-to-frame connections.

scholarly journals Comparative study of codes for the seismic design of structures

2012 ◽  
Vol 5 (6) ◽  
pp. 812-819
Author(s):  
S. H. C. Santos ◽  
S. S. Lima ◽  
A. Arai
Keyword(s):  
Seismic Design ◽  
Response Spectra ◽  
Soil Liquefaction ◽  
Eurocode 8 ◽  
South American ◽  
The South ◽  
Seismic Zonation ◽  
Seismic Force ◽  
Western Border ◽  
Definition Of

A general evaluation of some points of the South American seismic codes is presented herein, comparing them among themselves and with the American Standard ASCE/SEI 7/10 and with the European Standard Eurocode 8. The study is focused in design criteria for buildings. The Western border of South America is one of the most seismically active regions of the World. It corresponds to the confluence of the South American and Nazca plates. This region corresponds roughly to the vicinity of the Andes Mountains. This seismicity diminishes in the direction of the comparatively seismically quieter Eastern South American areas. The South American countries located in its Western Border possess standards for seismic design since some decades ago, being the Brazilian Standard for seismic design only recently published. This study is focused in some critical topics: definition of the recurrence periods for establishing the seismic input; definition of the seismic zonation and design ground motion values; definition of the shape of the design response spectra; consideration of soil amplification, soil liquefaction and soil-structure interaction; classification of the structures in different importance levels; definition of the seismic force-resisting systems and respective response modification coefficients; consideration of structural irregularities and definition of the allowable procedures for the seismic analyses. A simple building structure is analyzed considering the criteria of the several standards and obtained results are compared.

scholarly journals Seismic Acceleration and Displacement Demand Profiles of Non-Structural Elements in Hospital Buildings

Buildings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 243
Author(s):  
Giammaria Gabbianelli ◽  
Daniele Perrone ◽  
Emanuele Brunesi ◽  
Ricardo Monteiro
Keyword(s):  
Seismic Design ◽  
Response Spectra ◽  
Relative Displacement ◽  
Seismic Demand ◽  
Structural Elements ◽  
Practical Application ◽  
Absolute Acceleration ◽  
Floor Response Spectra ◽  
Performance Based Seismic Design ◽  
Definition Of

The importance of non-structural elements in performance-based seismic design of buildings is presently widely recognized. These elements may significantly affect the functionality of buildings even for low seismic intensities, in particular for the case of critical facilities, such as hospital buildings. One of the most important issues to deal with in the seismic performance assessment of non-structural elements is the definition of the seismic demand. This paper investigates the seismic demand to which the non-structural elements of a case-study hospital building located in a medium–high seismicity region in Italy, are prone. The seismic demand is evaluated for two seismic intensities that correspond to the definition of serviceability limit states, according to Italian and European design and assessment guidelines. Peak floor accelerations, interstorey drifts, absolute acceleration, and relative displacement floor response spectra are estimated through nonlinear time–history analyses. The absolute acceleration floor response spectra are then compared with those obtained from simplified code formulations, highlighting the main shortcomings surrounding the practical application of performance-based seismic design of non-structural elements. The absolute acceleration floor response spectra are then compared with those obtained from simplified code formulations. The results, both in terms of absolute acceleration and relative displacement floor response spectra, highlighted the influence of the higher modes of the structure and the inaccuracy of the code provisions, pointing out the need for more accurate simplified methodologies for the practical application of performance-based seismic design of non-structural elements.

scholarly journals Prestressed concrete seismic design

1973 ◽  
Vol 6 (1) ◽  
pp. 2-21
Author(s):  
R. W. G. Blakeley
Keyword(s):  
New Zealand ◽  
Seismic Design ◽  
Prestressed Concrete ◽  
Structural Elements ◽  
Design Practice ◽  
Concrete Frames ◽  
Concrete Members ◽  
Load Factors ◽  
Seismic Resistant ◽  
Inelastic Seismic Response

The approach of design and research engineers to the use of prestressed concrete in primary seismic resistant structural elements is reviewed. Some results of recent research into the ductility of prestressed concrete members and the inelastic seismic response of prestressed concrete frames are presented. Also, the principles and recommendations of
the FIP-CEB and others for seismic resistant design are given and current New Zealand
design practice is summarised. Finally, the question of suitable load factors for pre-stressed concrete structures is discussed.

Drift-based seismic design procedure for Buckling Restrained Braced Frames

Structures ◽  
2021 ◽  
Vol 30 ◽  
pp. 62-74
Author(s):  
Seyed Amin Mousavi ◽  
Seyed Mehdi Zahrai ◽  
Ali Akhlagh Pasand
Keyword(s):  
Seismic Design ◽  
Design Procedure ◽  
Braced Frames ◽  
Buckling Restrained Braced Frames

scholarly journals Parametric Analysis of Rotational Effects in Seismic Design of Tall Structures

2021 ◽  
Vol 11 (2) ◽  
pp. 597
Author(s):  
Milan Sokol ◽  
Rudolf Ároch ◽  
Katarína Lamperová ◽  
Martin Marton ◽  
Justo García-Sanz-Calcedo
Keyword(s):  
Seismic Design ◽  
Parametric Study ◽  
Tall Buildings ◽  
Soil Parameters ◽  
Eurocode 8 ◽  
Tall Structures ◽  
Rotational Components ◽  
Different Types ◽  
Depth Study

This paper uses a parametric study to evaluate the significance of the rotational components of Earth’s motion in a seismic design. The parametric study is based on the procedures included in Eurocode 8, Part 6. Although the answer to the question of when the effects of rotational components are important is quite a complex one and requires a more in-depth study, our aim was to try to assess this question in a relatively quick manner and with acceptable accuracy. The first part of the paper is devoted to derivation of a simple formula that can be used for expressing the importance of rotational components in comparison with the classic seismic design without their usage. The quasi-static analysis, assuming inertial forces, is used. A crucial role plays the shape of the fundamental mode of the vibration. Due to simplicity reasons, well-known expression for estimation of the first eigenmode as an exponential function with different power coefficients that vary for different types of buildings is used. The possibility of changing the soil parameters is subsequently included into the formula for estimation of the fundamental frequency of tall buildings. In the next part, the overall seismic analyses of complex FEM models of 3D buildings and chimneys are performed. The results from those analyses are then compared with those from simplified calculations. The importance of the soil characteristics for determination of whether it is necessary to take into account the rotational effects is further discussed.

scholarly journals Research on Organizational Communication

2007 ◽  
Vol 28 (1) ◽  
pp. 93-110 ◽  
Author(s):  
Catrin Johansson
Keyword(s):  
Organizational Communication ◽  
Case Study Research ◽  
Public Information ◽  
International Perspective ◽  
Internal Communication ◽  
Information Campaigns ◽  
Research Themes ◽  
Wide Definition ◽  
Definition Of

Abstract Swedish research on organizational communication is characterized by empirical, qualitative research. The tradition of holistic and profound case studies is strong. In this article, a wide definition of organizational communication is employed, including research focusing on both internal and external communication. Research themes and methods are reviewed and discussed. The majority of the studies concern public information, including health communication and crisis communication. Particularly, scholars have studied planning and evaluation of information campaigns concerning health, traffic and environment; and more recently, authority communication during major crises in society. Research focusing on organizations’ internal communication includes topics such as superior-subordinate communication, organizational learning, sensemaking, communication strategies and communication efficiency. Strengths and weaknesses following from this empirical case study research tradition are highlighted. Finally, the contribution of Swedish research in an international perspective is discussed.

Sign in / Sign up

Export Citation Format

Share Document