Annacis cable-stayed bridge—design for earthquake

1985 ◽  
Vol 12 (3) ◽  
pp. 472-482 ◽  
Author(s):  
P. R. Taylor ◽  
A. M. van Selst ◽  
W. E. Hodge ◽  
R. G. Sexsmith
Keyword(s):  
Computer Modelling ◽  
Dynamic Modelling ◽  
Seismic Source ◽  
Careful Consideration ◽  
Soil Liquefaction ◽  
Source Zone ◽  
Earthquake Risk ◽  
Ground Shaking ◽  
Cable Stayed Bridge ◽  
Under Construction

The 465 m span Annacis cable-stayed bridge, currently under construction near Vancouver, British Columbia, will be the longest cable-stayed span in the world when it is completed in 1986. As this bridge is partially founded on soft delta deposits and is located within 80 km of a seismic source zone, its design has required careful consideration of earthquake effects. This paper reports the seismic analytical and design approaches adopted for the foundations and superstructure of the bridge. Details covered include dynamic modelling of the subsoil layers, correlation of measured surface accelerations with those predicted by computer modelling from nearby rock accelerations, earthquake risk analysis, assessment of the soil liquefaction potential, compliance of deep piles and pier translation during ground shaking, dynamic modelling of the superstructure, ductility and displacement demands in the superstructure, and details for construction. Key words: bridges, earthquake.

Potential Losses in a Repeat of the 1886 Charleston, South Carolina, Earthquake

2005 ◽  
Vol 21 (4) ◽  
pp. 1157-1184 ◽  
Author(s):  
Ivan Wong ◽  
Jawhar Bouabid ◽  
William Graf ◽  
Charles Huyck ◽  
Allan Porush ◽  
...  
Keyword(s):  
South Carolina ◽  
Public Awareness ◽  
Seismic Source ◽  
The State ◽  
Earthquake Risk ◽  
Loss Assessment ◽  
Ground Shaking ◽  
Earthquake Scenarios ◽  
Earthquake Losses ◽  
Fire Stations

A comprehensive earthquake loss assessment for the state of South Carolina using HAZUS was performed considering four different earthquake scenarios: a moment magnitude ( M) 7.3 “1886 Charleston-like” earthquake, M 6.3 and M 5.3 events also from the Charleston seismic source, and an M 5.0 earthquake in Columbia. Primary objectives of this study were (1) to generate credible earthquake losses to provide a baseline for coordination, capability development, training, and strategic planning for the South Carolina Emergency Management Division, and (2) to raise public awareness of the significant earthquake risk in the state. Ground shaking, liquefaction, and earthquake-induced landsliding hazards were characterized using region-specific inputs on seismic source, path, and site effects, and ground motion numerical modeling. Default inventory data on buildings and facilities in HAZUS were either substantially enhanced or replaced. Losses were estimated using a high resolution 2- km×2- km grid rather than the census tract approach used in HAZUS. The results of the loss assessment indicate that a future repeat of the 1886 earthquake would be catastrophic, resulting in possibly 900 deaths, more than 44,000 injuries, and a total economic loss of $20 billion in South Carolina alone. Schools, hospitals, fire stations, ordinary buildings, and bridges will suffer significant damage due to the general lack of seismic design in the state. Lesser damage and losses will be sustained in the other earthquake scenarios although even the smallest event could result in significant losses.

scholarly journals Geological and Structural Control on Localized Ground Effects within the Heunghae Basin during the Pohang Earthquake (MW 5.4, 15th November 2017), South Korea

Geosciences ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 173 ◽  
Author(s):  
Sambit Naik ◽  
Young-Seog Kim ◽  
Taehyung Kim ◽  
Jeong Su-Ho
Keyword(s):  
South Korea ◽  
Structural Control ◽  
Seismic Waves ◽  
Tectonic Setting ◽  
Lateral Spreading ◽  
Soil Liquefaction ◽  
Ground Shaking ◽  
Potential Mapping ◽  
Sand Boils ◽  
Ground Effects

On 15th November 2017, the Pohang earthquake (Mw 5.4) had strong ground shaking that caused severe liquefaction and lateral spreading across the Heunghae Basin, around Pohang city, South Korea. Such liquefaction is a rare phenomenon during small or moderate earthquakes (MW < 5.5). There are only a few examples around the globe, but more so in the Korean Peninsula. In this paper, we present the results of a systematic survey of the secondary ground effects—i.e., soil liquefaction and ground cracks—developed during the earthquake. Most of the liquefaction sites are clustered near the epicenter and close to the Heunghae fault. Based on the geology, tectonic setting, distribution, and clustering of the sand boils along the southern part of the Heunghae Basin, we propose a geological model, suggesting that the Heunghae fault may have acted as a barrier to the propagation of seismic waves. Other factors like the mountain basin effect and/or amplification of seismic waves by a blind thrust fault could play an important role. Liquefaction phenomenon associated with the 2017 Pohang earthquake emphasizes that there is an urgent need of liquefaction potential mapping for the Pohang city and other areas with a similar geological setting. In areas underlain by extensive unconsolidated basin fill sediments—where the records of past earthquakes are exiguous or indistinct and there is poor implementation of building codes—future earthquakes of similar or larger magnitude as the Pohang earthquake are likely to occur again. Therefore, this represents a hazard that may cause significant societal and economic threats in the future.

scholarly journals A seismic source zone model for the seismic hazard assessment of Slovakia

2016 ◽  
Vol 67 (3) ◽  
pp. 275-290 ◽  
Author(s):  
Jozef Hók ◽  
Robert Kysel ◽  
Michal Kováč ◽  
Peter Moczo ◽  
Jozef Kristek ◽  
...  
Keyword(s):  
Seismic Hazard ◽  
Hazard Assessment ◽  
Large Scale ◽  
Seismic Hazard Assessment ◽  
Seismic Source ◽  
Source Zone ◽  
Zone Model ◽  
Geological Structures ◽  
Seismotectonic Model ◽  
Seismogenic Structures

Abstract We present a new seismic source zone model for the seismic hazard assessment of Slovakia based on a new seismotectonic model of the territory of Slovakia and adjacent areas. The seismotectonic model has been developed using a new Slovak earthquake catalogue (SLOVEC 2011), successive division of the large-scale geological structures into tectonic regions, seismogeological domains and seismogenic structures. The main criteria for definitions of regions, domains and structures are the age of the last tectonic consolidation of geological structures, thickness of lithosphere, thickness of crust, geothermal conditions, current tectonic regime and seismic activity. The seismic source zones are presented on a 1:1,000,000 scale map.

scholarly journals Timely determination of static stability margins in power supply systems equipped with distributed generation installations

2021 ◽  
Vol 25 (1) ◽  
pp. 31-43
Author(s):  
Yu. N. Bulatov ◽  
A. V. Kryukov ◽  
К. V. Suslov ◽  
A. V. Cherepanov
Keyword(s):  
Distributed Generation ◽  
Power Supply ◽  
Computer Modelling ◽  
Dynamic Modelling ◽  
Electrical Network ◽  
Electrical Networks ◽  
Stability Margins ◽  
Emergency Control ◽  
Supply Systems

The article aims to develop a methodology to ensure timely determination of the margins of static aperiodic stability in power supply systems, at the nodal points of which distributed generation units are installed. The authors used mathematical methods and algorithms based on the application of limiting regime equations. Transitional processes were analysed for various points in the space of controlled mode parameters according to the simulation modelling in Matlab using the Simulink and SimPowerSystems packages. On the basis of the obtained results, an effective technique for analysing stability margins in electrical networks with distributed generation units was implemented. This method is applicable in design problems, as well as in operational and emergency control. The conducted theoretical analysis and computer modelling showed the effectiveness of the proposed methodology for calculating stability margins; the nondegeneracy of the Jacobi matrix of limiting regime equations at the solution point ensures the guaranteed reliability of the results. It was shown that an alternative approach to solving the problem of timely determination of aperiodic stability margins can be implemented on the basis of limiting regime equation with increased nonlinearity. Dynamic modelling of an electrical network with distributed generation units confirmed the correctness of determining the stability margins calculated using limiting regime equations. The developed technique can be recommended for practical use in the design of power supply systems or in operational control of synchronous generators. In particular, the presented methodology can be used to implement a multi-agent emergency control system for distributed generation installations located in generalpurpose distribution electrical networks. 

scholarly journals Geotechnical aspects of the 2007 Niigataken Chuetsu-Oki, Japan earthquake

2008 ◽  
Vol 41 (2) ◽  
pp. 83-89 ◽  
Author(s):  
Rolando P. Orense ◽  
Masayuki Hyodo ◽  
Hiroaki Kanda ◽  
Junya Ohashi
Keyword(s):  
Built Environment ◽  
West Coast ◽  
Civil Engineering ◽  
Soil Liquefaction ◽  
Earthquake Damage ◽  
The West ◽  
Engineering Structures ◽  
Ground Shaking ◽  
Preliminary Results ◽  
Damage Investigation

On 16 July 2007, an earthquake of magnitude 6.8 occurred with an epicentre off the west coast of Niigata Prefecture (Japan), causing widespread damage to buildings and other types of civil engineering structures due to ground shaking and earthquake-induced ground failures. Landsliding and soil liquefaction occurred extensively in various parts of the affected region. This paper presents the preliminary results of the post-earthquake damage investigation conducted at the affected areas after the earthquake, with emphasis on the seismic-induced ground failures and their effects on the built environment.

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