Evaluation of dynamic eccentricities obtained using a probabilistic approach, response spectrum methods and modern building codes

1988 ◽  
Vol 16 (2) ◽  
pp. 275-291 ◽  
Author(s):  
M. A. Rady ◽  
G. L. Hutchinson
Keyword(s):  
Response Spectrum ◽  
Probabilistic Approach ◽  
Building Codes ◽  
Approach Response ◽  
Modern Building

Assessment of the Seismicity of Peshawar Region in Line with the Historical Data and Modern Building Codes (ASCE-07 & IBC-2006)

2019 ◽  
pp. 1-25 ◽  
Author(s):  
Bilal Ahmad Shah ◽  
Muhammad Maqbool Sadiq ◽  
Shazim Ali Memon ◽  
Sardar Kashif Ur Rehman
Keyword(s):  
Historical Data ◽  
Building Codes ◽  
Modern Building

Torsional provisions in building codes

1982 ◽  
Vol 9 (1) ◽  
pp. 38-46 ◽  
Author(s):  
W. K. Tso ◽  
V. Meng
Keyword(s):  
Response Spectrum ◽  
Building Codes ◽  
Irregular Structures ◽  
Uniform Frame ◽  
Reliable Procedure ◽  
Lateral Resonance ◽  
Story Building ◽  
Current Code ◽  
Code Provisions ◽  
Computed Torque

A study is made of the accuracy of the static code provisions on torsional effects, with special reference to the National Building Code of Canada of 1977. A uniform frame type monosymmetric 12-story building is used as an example. The static story torque is compared with the dynamic torque computed using the response spectrum technique as outlined in Commentary K of the Code. It has been found that for a building with uniform eccentricity, the static code torque estimate is good if the effect of sympathetic coupled torsional–lateral resonance is small. At the sympathetic coupled resonance, the static code torsional provision underestimates the story torque by a factor of approximately two. Also, it is shown that for buildings with large eccentricities, sympathetic resonance is unlikely to occur and the current Code requirement of doubling the computed torque for design is a very conservative requirement.In addition, the eccentricity expression given in the 1980 Code is used to estimate the story torques for eccentrically set-back buildings and its accuracy is checked with a response spectrum technique. It is concluded that for irregular structures, such as eccentrically set-back buildings, a dynamic analysis is the only reliable procedure for the estimation of the torque loading on the building.

Design for Robustness

2009 ◽  
Author(s):  
Franz Knoll ◽  
Thomas Vogel
Keyword(s):  
Building Codes ◽  
Structural Safety ◽  
Loss Of Function ◽  
Philosophical Approach ◽  
Design Rules ◽  
Structural Robustness ◽  
The World ◽  
Recent Insight ◽  
Modern Building

<p>Robustness is the ability to survive unforeseen circum-stances without undue damage or loss of function. It has become a requirement expressed in modern building codes, mostly without much advice as to how it can be achieved. Engineering has developed some approaches based on tra-ditional practice as well as recent insight. However, know-ledge about robustness remains scattered and ambiguous, making it difficult to apply to many specific cases. <p> The authors' attempt to collect and review elements, methods and strategies toward structural robustness, using a holistic, almost philosophical approach. This leads to a set of consid-erations to guide selection and implementation of measures in specific cases, followed by a collection of applications and examples from the authors practice.<p>The world, engineering and construction are imperfect and not entirely predictable. Robustness provides a measure of structural safety beyond traditional codified design rules.

scholarly journals Restoring a Piece of History

1999 ◽  
Vol 121 (04) ◽  
pp. 62-66
Author(s):  
Micheal Valenti
Keyword(s):  
20Th Century ◽  
17Th Century ◽  
Building Codes ◽  
Historic Buildings ◽  
Speed Up ◽  
Modern Building

This article discusses that the French have traditionally maintained the appearance of their historic buildings by using the same materials and techniques used by the artisans who originally constructed them. While this strategy guaranteed the architectural integrity of the structures, it also limited the use of the buildings after their restoration, because historic materials are often unable to withstand the stresses of 20th century use and cannot meet modern building codes. Monuments Historiques reasoned that using modern materials would speed up restoration, adapt a building to modern uses, and still preserve its historic appearance. They demonstrated the feasibility of this marriage of 20th-century materials and 17th-century building styles with the restoration of the Brittany Parliament in Rennes after it had been gutted by fire. Investigators assessing the damage said that 50 percent of the soft stone would have to be replaced, as well as 70 percent of the stone in the building’s southeast pavilion.

scholarly journals Effects of Soil on the Seismic Design of Long Span Steel Frames Using Contemporary Building Codes

2020 ◽  
Vol 18 (02) ◽  
pp. 1-10
Author(s):  
Muhammad Tayyab Naqash ◽  
Qazi Umar Farooq
Keyword(s):  
Soil Structure ◽  
Response Spectrum ◽  
Building Codes ◽  
Soil Structure Interaction ◽  
Soil Stiffness ◽  
Structure Interaction ◽  
Long Span ◽  
Moment Resisting ◽  
The Moment ◽  
Seismic Forces

Seismic excitations and other lateral dynamic distress cause the structure’s foundation to interact with the superstructure’s response. Consequently, the surplus stress distribution takes place. This disturbance in the lateral stiffness of the system can cause un-satisfaction with the adopted code provisions. In the above scenario, soil structure interaction of the Moment Resisting Frames (MRFs) becomes very crucial. This article deals with soil stiffness on the long-span MRFs designed with two modern building codes, namely Saudi Building Code (based on American Standards) and Eurocodes. High and medium ductility with parameter and spatial frame configurations are considered in this study. Each frame is analysed considering the foundation stiffness, calculated based on FEMA recommendations. Hence, a total of 18 cases are examined, conducting a modal response spectrum analysis. The period, top displacements, reactions, and damageability criterion for the analyzed frames are compared. It is shown that the consideration of SSI (Soil Structure Interaction) is paramount for frames with such spans, especially when subjected to high seismic forces.

A probabilistic approach to ground-motion selection for engineering design

1995 ◽  
Vol 85 (3) ◽  
pp. 937-942
Author(s):  
Martin C. Chapman
Keyword(s):  
Time Series ◽  
Seismic Hazard ◽  
Ground Motion ◽  
Earthquake Engineering ◽  
Response Spectrum ◽  
Probabilistic Approach ◽  
Data Set ◽  
Motion Time ◽  
Wide Range ◽  
Hazard Level

Abstract The solutions of many earthquake engineering problems involve dynamic analyses using ground-motion time series. It is often desirable to base the selection of such motions on a probabilistic estimate of the seismic hazard. The hazard density function evaluated at a chosen hazard level provides the information necessary to determine objectively the most likely earthquake events, defined by magnitude and distance, that contribute to seismic hazard. For a wide range of hazard models it is possible to show that the difference between the median motion at a site, given the occurrence of the most likely event, and the motion value corresponding to a specified hazard level, is due entirely to the modeling of random error in the strong-motion data set. This points to a straightforward approach to selecting ground-motion recordings that represent the most likely time-domain realizations of the hazard model for a given motion parameter and hazard level. Ground-motion time series selection and/or synthesis based upon this approach, for various frequency bands of the response spectrum, can provide an optimum basis for seismic design.

Seismic Analysis of a Pressure Vessel

2006 ◽  
Author(s):  
Mike Porter ◽  
Dennis Martens ◽  
Sean McGuffie
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Pressure Vessels ◽  
Building Codes ◽  
Static Force ◽  
Element Analysis ◽  
Modification Factor ◽  
Section Viii ◽  
Earthquake Event ◽  
Operation Status

The seismic analysis of ASME Section VIII Div 1 [1] industrial pressure vessels has typically been accomplished using rather simplified “equivalent static force” procedures. As detailed by Bardia et al [2], the equivalent static force from an earthquake event is developed from tabular data in building codes. In general, these procedures have proven to be safe and effective. However, this method assumes that deformation may occur but containment will be maintained. A similar assumption of deformation is contained in the modification factor used in building codes. If the vessel is expected to function after a specific earthquake event, such methods are not adequate for design. This paper addresses a more detailed procedure of seismic analysis that involves a finite element analysis of the vessel incorporating the interaction of the piping and the vessel. This methodology provides a better understanding of the localized stresses, such those as at vessel nozzles with pipe attached. This methodology may be used to analyze a vessel for a design that can be subjected to a specific earthquake response spectrum with minimal deformation and probable return to operation status.

Sign in / Sign up

Export Citation Format

Share Document