Seismic analysis and design of the skytrain cable-stayed bridge

1996 ◽  
Vol 23 (6) ◽  
pp. 1241-1248 ◽  
Author(s):  
M. S. Khalil
Keyword(s):  
Seismic Analysis ◽  
Response Spectra ◽  
Design Parameters ◽  
Soil Conditions ◽  
Analysis And Design ◽  
Cable Stayed Bridge ◽  
Input Motion ◽  
Earthquake Effects ◽  
Seismic Area ◽  
Cable Stayed Bridges

The Skytrain Fraser River Crossing near Vancouver is a cable-stayed bridge completed in late 1988. The bridge is located in a highly seismic area with different soil conditions on the two banks of the river and liquefaction potential in the event of a major earthquake. This paper discusses the analysis and design considerations of the bridge for earthquake effects. Discussed in the paper are site conditions, design criteria, input motion, analysis methods, and design parameters. Key words: cable-stayed, bridges, seismic, response spectra, detailing.

scholarly journals Seismic Analysis and Design of Minpu Double-Deck Cable-Stayed Bridge

2011 ◽  
Vol 14 ◽  
pp. 1501-1509 ◽  
Author(s):  
Hongyi Weiab ◽  
Zhiqiang Wang ◽  
Qinghai Feng
Keyword(s):  
Seismic Analysis ◽  
Analysis And Design ◽  
Cable Stayed Bridge

Influence of soil conditions on the seismic behaviour of two cable-stayed bridges

1995 ◽  
Vol 22 (5) ◽  
pp. 1021-1040 ◽  
Author(s):  
Mohamed Elassaly ◽  
Amin Ghali ◽  
Mamdouh M. Elbadry
Keyword(s):  
Soil Structure ◽  
Seismic Waves ◽  
Seismic Analysis ◽  
Soil Structure Interaction ◽  
Soil Conditions ◽  
Seismic Behaviour ◽  
Internal Forces ◽  
Time Required ◽  
Cable Stayed Bridges

The results of a case study of the internal forces caused by earthquake in two examples of cable-stayed bridges are presented. A comparison is made between the behaviour of a model in which the structure is idealized without the foundation system and a model in which both the structure and the supporting foundation are idealized. The effects of varying the soil conditions on the seismic response are assessed. Also, the effects of out-of-phase support movements, caused by the lapse of time required for the seismic waves to travel from one support to the other, are considered. It is concluded that the effects of these parameters are significant and should not be ignored in the seismic analysis of cable-stayed bridges. Key words: bridges, cable-stayed, dynamic, earthquake, internal forces, seismic, soil–structure interaction.

DAMAGE EVOLUTION SPECTRA FOR SEISMIC ANALYSIS OF HIGH-RISE BUILDINGS

2012 ◽  
Vol 06 (03) ◽  
pp. 1250021
Author(s):  
Y. B. HO ◽  
J. S. KUANG
Keyword(s):  
Damage Evolution ◽  
Seismic Analysis ◽  
Ground Motions ◽  
Time History ◽  
Tall Buildings ◽  
Response Spectra ◽  
Seismic Damage ◽  
Analysis And Design ◽  
High Rise ◽  
Earthquake Ground Motions

Seismic response spectra are amongst one of the most important tools for characterizing earthquake ground motions. In design practice, the response spectra are presented without including any load history, hence the nonlinear analysis of structures based solely on conventional earthquake response spectra is theoretically unsound, particularly for long-period or vertically irregular high-rise buildings. In this paper, a concept of seismic damage evolution is introduced and the method of analysis for characterizing the process of seismic damage to structures under earthquakes is presented. Seismic damage evolution spectra for analysis and design of high-rise buildings are then developed as an effective means of describing and simplifying earthquake ground motions. These spectra are shown to be very useful in selecting the ground motion-time history and, particularly, validating the equivalent static-load analysis and design of high-rise buildings under near-fault pulse-like ground motions. Case studies of the seismic inelastic performance of two vertically irregular, tall buildings are presented considering the seismic damage evolution spectra.

Analysis on Reasonable Structure of Main Girder of Harp Shaped Cable-Stayed Bridge without Backstays

2011 ◽  
Vol 90-93 ◽  
pp. 1061-1068
Author(s):  
Ai Jun Chen ◽  
Guo Jing He
Keyword(s):  
Design Parameters ◽  
Bridge Design ◽  
Structure Selection ◽  
Cable Stayed Bridge ◽  
Design Philosophy ◽  
Section Design ◽  
Selection For ◽  
Main Girder ◽  
Cable Stayed Bridges

Harp shaped cable-stayed bridges without backstays are popular due to their beautiful and unique styles; they employ leaning tower columns to balance the constant and movable loads on the decks and are not provided with backstays, so they are beyond the traditional bridge design philosophy. In this paper, we discussed the reasonable structure of the main girder of Changsha Hongshan Bridge – a harp shaped cable-stayed bridge without backstays through changing the design parameters of the main girder in respect of design so as to provide important reference for design of this kind of bridges, and the research mainly related to such aspects as the structure selection for and section design of the main girder, the influence of overweight of main girder on the force on the structure, the length of non-cable area of the main girder, the span of auxiliary hole, etc.

scholarly journals Static and Dynamic Mechanical Properties of Long-Span Cable-Stayed Bridges Using CFRP Cables

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Mei Kuihua ◽  
Sun Shengjiang ◽  
Jin Guoqing ◽  
Sun Yamin
Keyword(s):  
Vibration Frequency ◽  
Temperature Effects ◽  
Natural Vibration ◽  
Dynamic Performance ◽  
Design Parameters ◽  
Natural Vibration Frequency ◽  
Steel Cable ◽  
Cable Stayed Bridge ◽  
Steel Cables ◽  
Cable Stayed Bridges

The elastic modulus and deadweight of carbon fiber-reinforced polymer (CFRP) cables are different from those of steel cables. Thus, the static and dynamic behaviors of cable-stayed bridges using CFRP cables are different from those of cable-stayed bridges using steel cables. The static and dynamic performances of the two kinds of bridges with a span of 1000 m were studied using the numerical method. The effects of geometric nonlinear factors on static performance of the two kinds of cable-stayed bridges were analyzed. The live load effects and temperature effects of the two cable-stayed bridges were also analyzed. The influences of design parameters, including different structural systems, the numbers of auxiliary piers, and the space arrangement types of cable, on the dynamic performance of the cable-stayed bridge using CFRP cables were also studied. Results demonstrate that sag effect of the CFRP cable is much smaller than that of steel cable. The temperature effects of CFRP cable-stayed bridge are less than those of steel cable-stayed bridge. The vertical bending natural vibration frequency of the CFRP cable-stayed bridge is generally lower than that of steel cable-stayed bridge, whereas the torsional natural vibration frequency of the former is higher than that of the latter.

scholarly journals Investigation of the Effect of the Deck Material on the Cost in Cable-Stayed Bridges with Different Spans

2021 ◽  
Vol 10 (1) ◽  
pp. 11-33
Author(s):  
Ali Köken ◽  
Ahmed Ali Abdulqader Farhad
Keyword(s):  
Reinforced Concrete ◽  
Three Dimensional Model ◽  
Main Bearing ◽  
Analysis And Design ◽  
Bridge Program ◽  
Cable Stayed Bridge ◽  
The World ◽  
The Cost ◽  
Cable Stayed Bridges ◽  
Bridge System

Abstract Recent developments in the social sphere also cause an increase in transportation activities. Increased transport activities lead to the construction of new roads and bridges. Different bridge construction systems are available to overcome large span obstacles. Cable-stayed bridges are more advantageous construction systems than other bridge type building carrier systems in overcoming large spans through suspension cables. Therefore, it is also widely preferred by designers. The biggest factor in the development of cable-stayed bridges is undoubtedly steel cables. Cable-stayed bridges are bridge structures that become lighter with the increase of the span, which has a more expanded flexibility, and that includes a cable system with the effect of nonlinear factors. Costs of cable-stayed bridges vary according to different spans. The span as well as the deck material used in the bridge system have a great effect on the cost. In cable-stayed bridge systems, decks are constructed of reinforced concrete and steel. The costs of cable-stayed bridges are widely discussed around the world; therefore, the effect of the span and deck material on the cost of cable-stayed bridges is being investigated. The main bearing elements of such bridges are cables, decks, and towers, and among these elements, the tower bridge carries all the weight of the bridge, even other external loads such as vehicle, wind, etc. In this study, the three-dimensional model of the cable, deck and tower elements that make up the cable-stayed bridge system was created and analysed using the CSI Bridge Program. The AASHTO LRFD Standards, which are widely used in the analysis of bridge systems with the CSI Bridge program and the design of bridge systems in the world, were used. In the study, the analysis and designs of cable-stayed bridges with reinforced concrete and steel deck at 250, 500, 750, 1000, 1500, 2000 meters span were carried out. The amount of materials and costs used in the analysis and design of the cable-stayed bridge systems were obtained and the results were interpreted.

Seismic Analysis of Structures Subjected to Spatially Varying Earthquake Using POD Vectors: Experimental and Analytical Studies

2020 ◽  
Vol 14 (04) ◽  
pp. 2050017
Author(s):  
K. Balamonica ◽  
N. Gopalakrishnan ◽  
A. Ramamohan Rao
Keyword(s):  
Seismic Analysis ◽  
Null Space ◽  
Time History ◽  
Soil Conditions ◽  
Classical Formulation ◽  
Local Soil ◽  
Wave Passage ◽  
Input Motion ◽  
Differential Excitation ◽  
Spatially Varying

Structures, such as bridges, pipelines which are supported at multiple places, will be subjected to differential excitation. A significant change in the correlation of the motions between the two supports is due to the combined effects of wave passage, coherency loss and local soil conditions. In the classical formulation, the response is divided into quasi-static and dynamic components and the latter is usually evaluated by time history methods or modal analysis for a linear system. In this work, the feasibility of Proper Orthogonal Decomposition (POD) vectors as a replacement for the conventional eigenvectors has been discussed. The performance of POD modes has been assessed for the uncoupled system, system having closely spaced modes. The null space vectors of the POD modes generated from the response of the structure subjected to correlated input motion were able to predict the responses of the structures subjected to spatially varying input motions. The efficiency of using the POD vectors has also been verified with the help of an experiment conducted on a steel control and safety rod drive mechanism (CSRDM) which is an example of multi-supported and differentially excited structure.

scholarly journals Comparative Study of Codes for Seismic Design of Structures

2013 ◽  
Vol 9 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Sergio Hampshire De C. Santos ◽  
Luca Zanaica ◽  
Carmen Bucur ◽  
Silvio De Souza Lima
Keyword(s):  
Seismic Design ◽  
Model Building ◽  
Seismic Analysis ◽  
Response Spectra ◽  
Soil Conditions ◽  
Seismic Zonation ◽  
Seismic Input ◽  
Local Soil ◽  
Seismic Force ◽  
Definition Of

Abstract This paper presents a comparative evaluation among some international, European and American, seismic design standards. The study considers the criteria for the analysis of conventional (residential and commercial) buildings. The study is focused on some critical topics: definition of the recurrence periods for establishing the seismic input; definition of the seismic zonation and shape of the design response spectra; consideration of local soil conditions; definition of the seismic force-resisting systems and respective response modification coefficients; definition of the allowable procedures for the seismic analysis. A model for a standard reinforced concrete building (“Model Building”) has been developed to permit the comparison among codes. This building has been modelled with two different computer programs, SAP2000 and SOFiSTiK and subjected to seismic input according to the several seismic codes. The obtained results compared are leading to some important conclusions.

Seismic Performance Evaluation of Large Span Cable-Stayed Bridges

2013 ◽  
Vol 477-478 ◽  
pp. 1029-1033
Author(s):  
Min Zhang ◽  
Si Feng Qin ◽  
Li Song
Keyword(s):  
Performance Evaluation ◽  
Seismic Performance ◽  
Seismic Analysis ◽  
Pushover Analysis ◽  
Analysis Method ◽  
Seismic Performance Evaluation ◽  
Capacity Curves ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Cable Stayed Bridges

This paper focuses on the performance evaluation of long span cable-stayed bridge. Pushover method has been compared with RHA method to verify its validity. A specific bridge has been calculated by pushover analysis method using several different lateral load patterns. With four typical seismic analysis methods on the structure, the pushover analysis capacity curves have been compared with the RHA’s. It is demonstrated that the pushover method is accurate enough to be used in Engineering.

scholarly journals Seismic Analysis of Flat Slab by using ETABS

2020 ◽  
Vol 9 (3) ◽  
pp. 1142-1144
Keyword(s):  
Seismic Analysis ◽  
Concrete Slab ◽  
Progressive Collapse ◽  
Design Procedure ◽  
Soil Condition ◽  
Soil Conditions ◽  
Reinforced Concrete Slab ◽  
Flat Slab ◽  
Analysis And Design ◽  
Flat Slabs

The flat slab is a two-way reinforced concrete slab that usually does not have beams and girders, and the loads are transferred directly to the supporting concrete columns. ETABS automates several slab and mat design tasks. Specially, it integrates slab design moments across design strips and designs the required reinforcement; it checks slab punching shear around column supports and concentrated loads; and it designs shear link and shear stud if needed. The actual design algorithms vary based on the specific design code chosen by the user. This manual describes the algorithms used for the various codes. Recent earthquakes in which many concrete structures have been severely damaged or collapsed, have indicated the need for evaluating the seismic adequacy of existing buildings. About 60% of the land area of our country is susceptible to damaging levels of seismic hazard. Many existing flat slab buildings may not have been designed for seismic forces. Hence it is important to study their response under seismic conditions and to evaluate seismic retrofit schemes. This system is very simple to construct, and is efficient in that it requires the minimum building height for a given number of stories. Unfortunately, earthquake experience has proved that this form of construction is vulnerable to failure, when not designed and detailed properly, in which the thin concrete slab fractures around the supporting columns and drops downward, leading potentially to a complete progressive collapse of a building as one floor cascades down onto the floors below. Although flat slabs have been in construction for more than a century now, analysis and design of flat slabs are still the active areas of research and there is still no general agreement on the best design procedure. To study the effect of drop panels on the behavior of flat slab during lateral loads, flat plate system is also analyzed. Zone factor and soil conditions- the other two important parameters which influence the behavior of the structure, are also covered. Software ETABS is used for this purpose. In this study relation between the number of stories, zone and soil condition is developed.

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