Use of response surface metamodels to generate system level fragilities for existing curved steel bridges

2013 ◽  
Vol 52 ◽  
pp. 642-653 ◽  
Author(s):  
Junwon Seo ◽  
Daniel G. Linzell
Keyword(s):  
Response Surface ◽  
Steel Bridges ◽  
System Level ◽  
Generate System ◽  
Curved Steel

Non-linear seismic dynamic response of curved steel bridges equipped with LRB supports

2010 ◽  
Vol 3 (1) ◽  
pp. 34-41 ◽  
Author(s):  
Carlos Mendez Galindo ◽  
Javier Gil Belda ◽  
Toshiro Hayashikawa
Keyword(s):  
Dynamic Response ◽  
Steel Bridges ◽  
Non Linear ◽  
Curved Steel

scholarly journals Load Distribution Factors for Curved Concrete Slab-on-Steel I-Girder Bridges

2021 ◽  
Author(s):  
Mohammed A. Al-Hashimy
Keyword(s):  
Parametric Study ◽  
Load Distribution ◽  
Concrete Slab ◽  
Steel Bridges ◽  
Urban Systems ◽  
Lateral Bending ◽  
Curved Bridges ◽  
Horizontally Curved ◽  
Girder Bridges ◽  
Curved Steel

The use of complex interchanges in modern highway urban systems have increased recently in addition to the desire to conform to existing terrain; both have led to increase the demand for horizontally curved bridges. One type of curved bridges consists of composite concrete deck over steel I-girders which has been the preferred choice due to its simplicity in fabrication, transportation and erection. Although horizontally curved steel bridges constitute roughly one-third of all steel bridges being erected today, their structural behavior still not well understood. Due to its geometry, simple presence of curvature in curved bridges produces non uniform torsion and consequently, lateral bending moment (warping or bi-moment) in the girder flanges. The presence of the lateral bending moments would significantly complicate the analysis and the design of the structure. Hence, a parametric study is required to scrutinize a simplified method in designing horizontally curved steel I-girder bridges. A parametric study is conducted, using the finite-element analysis software "SAP2000", to examine the key parameters that may influence the load distribution on the curved composite steel girders. Based on the data generated from the parametric study, sets of empirical equations are developed for the moment and shear distribution factors for straight and curved steel I-girder bridges when subjected to the Canadian Highway Bridge Design Code (HCHBDC) truck loading.

Three-Dimensional Parametric Data Exchange for Curved Steel Bridges

2013 ◽  
Vol 2331 (1) ◽  
pp. 27-34 ◽  
Author(s):  
S. Gokhan Karaman ◽  
Stuart S. Chen ◽  
Benny J. Ratnagaran
Keyword(s):  
Data Exchange ◽  
Three Dimensional ◽  
Steel Bridges ◽  
Parametric Data ◽  
Curved Steel

scholarly journals Load Distribution Factors for Curved Concrete Slab-on-Steel I-Girder Bridges

2021 ◽  
Author(s):  
Mohammed A. Al-Hashimy
Keyword(s):  
Parametric Study ◽  
Load Distribution ◽  
Concrete Slab ◽  
Steel Bridges ◽  
Urban Systems ◽  
Lateral Bending ◽  
Curved Bridges ◽  
Horizontally Curved ◽  
Girder Bridges ◽  
Curved Steel

The use of complex interchanges in modern highway urban systems have increased recently in addition to the desire to conform to existing terrain; both have led to increase the demand for horizontally curved bridges. One type of curved bridges consists of composite concrete deck over steel I-girders which has been the preferred choice due to its simplicity in fabrication, transportation and erection. Although horizontally curved steel bridges constitute roughly one-third of all steel bridges being erected today, their structural behavior still not well understood. Due to its geometry, simple presence of curvature in curved bridges produces non uniform torsion and consequently, lateral bending moment (warping or bi-moment) in the girder flanges. The presence of the lateral bending moments would significantly complicate the analysis and the design of the structure. Hence, a parametric study is required to scrutinize a simplified method in designing horizontally curved steel I-girder bridges. A parametric study is conducted, using the finite-element analysis software "SAP2000", to examine the key parameters that may influence the load distribution on the curved composite steel girders. Based on the data generated from the parametric study, sets of empirical equations are developed for the moment and shear distribution factors for straight and curved steel I-girder bridges when subjected to the Canadian Highway Bridge Design Code (HCHBDC) truck loading.

Construction Issues in Steel Curved-Girder Bridges

1996 ◽  
Vol 1544 (1) ◽  
pp. 64-70
Author(s):  
Michael A. Grubb ◽  
John M. Yadlosky ◽  
Sheila Rimal Duwadi
Keyword(s):  
Steel Bridges ◽  
Concrete Bridges ◽  
Depth Information ◽  
Successful Completion ◽  
Curved Bridges ◽  
Design Decisions ◽  
Horizontally Curved ◽  
Girder Bridges ◽  
Curved Girder Bridges ◽  
Curved Steel

The construction of horizontally curved steel bridges is generally more complex than the construction of comparable straight-girder bridges of similar span. Curved-girder bridges, once completed, have generally performed as intended. Most problems that have occurred with curved-girder bridges have been related to fabrication and assembly procedures or unanticipated and unaccounted for deformations that occur during construction. As a result, these construction issues take on primary importance in the successful completion of the structure. Successful completion requires that each phase of construction proceeds as anticipated to ensure that the final structure is at the correct elevation to provide proper deck drainage and good riding quality. In some cases, construction issues for curved bridges have been given little or no special consideration by designers, or, at the very least, no more consideration than has been given to these issues for straight bridges. Thus, there is a need to better identify these issues, assemble and provide more in depth information on each of these issues to the design community, and emphasize their importance to designers. The significance of construction issues to complex horizontally curved steel bridges is in many ways analogous to their prominence in the design of segmental concrete bridges; construction issues often drive the design decisions. The objective is to promote awareness in the design of horizontally curved steel bridges to some of these construction issues.

Structural Reliability Analysis Using Quadratic Polynomial Response Surface and Finite Element in MATLAB

2016 ◽  
Author(s):  
M. M. A. Wahab ◽  
V. J. Kurian ◽  
M. S. Liew ◽  
Z. Nizamani ◽  
D. K. Kim
Keyword(s):  
Finite Element ◽  
Reliability Analysis ◽  
Response Surface ◽  
Structural Reliability ◽  
Limit State ◽  
Quadratic Polynomial ◽  
System Level ◽  
Approximation Technique ◽  
Reliability Indices ◽  
Polynomial Response Surface

Many aging jacket platforms are being pushed for continued use beyond their design life due to advancement in oil extracting technology and economic reasons. Thus reassessment to determine the platform safety is vital. But no exact guide on methods to assess the safety of the aging platforms is available. Hence, development of reliability analysis methodologies is an active research area. Meanwhile, reassessment deals with numerous uncertainties especially in the load and resistance variables of a jacket platform. Response Surface methodology, a limit state approximation technique was deployed by many in many engineering fields to apprehend inherent uncertainty. Hence in this work, a reliability analysis methodology that combines simple response surface and finite element approach in MATLAB is adopted. The approach assumes a physical transfer function utilizing explicit multivariate expressions and random variables. Also, this avoids large number of finite element simulation required for any probabilistic analysis. The methodology developed allows for reliability analysis to be performed based on easy to program procedures. It also addresses the platform and environmental specific uncertainty variables to distinguish the distinctive characteristics of the cases. Upon execution of multiple finite element simulations, response of components and systems are formulated using quadratic polynomial response surface expressions, which eventually are utilized in the limit state functions. Later using numerical techniques in a separate computational routine the reliability indices are estimated. Utilizing the developed method, component and system level reliability indices are obtained. The developed methodology also has been verified with method currently available in the practice as well as with typical simulation method i.e. Monte Carlo Simulation.

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