Explicit Time-Dependent Multi-Hazard Cost Analysis Based on Parameterized Demand Models for the Optimum Design of Bridge Structures

2015 ◽  
Vol 30 (7) ◽  
pp. 541-554 ◽  
Author(s):  
Vahid Bisadi ◽  
Jamie E. Padgett
Keyword(s):  
Cost Analysis ◽  
Optimum Design ◽  
Time Dependent ◽  
Demand Models ◽  
Bridge Structures

Applications of Time-Dependent Analysis in the Design of Hybrid Bridge Structures

PCI Journal ◽  
2001 ◽  
Vol 46 (4) ◽  
pp. 56-74 ◽  
Author(s):  
Jiri Strasky ◽  
Jaroslav Navratil ◽  
Stanislav Susky
Keyword(s):  
Time Dependent ◽  
Hybrid Bridge ◽  
Bridge Structures ◽  
Time Dependent Analysis

OPTIMUM DESIGN OF COMPOSITE BOX GIRDER BRIDGE STRUCTURES.

1977 ◽  
Vol 63 (1) ◽  
pp. 181-198
Author(s):  
JO SURTEES ◽  
D TORDOFF ◽  
◽  
◽  
Keyword(s):  
Optimum Design ◽  
Box Girder ◽  
Bridge Structures ◽  
Box Girder Bridge ◽  
Girder Bridge

Effect of Corrosion on Crack Development and Fatigue Life

1998 ◽  
Vol 1624 (1) ◽  
pp. 110-117 ◽  
Author(s):  
John W. Fisher ◽  
Eric J. Kaufmann ◽  
Alan W. Pense
Keyword(s):  
Fatigue Life ◽  
Weld Metal ◽  
Fatigue Cracking ◽  
High Strength ◽  
Time Dependent ◽  
Structural Behavior ◽  
The Past ◽  
Fatigue And Fracture ◽  
Bridge Structures

Fatigue and fracture as well as loss of section caused by corrosion are time-dependent performance characteristics that have the potential to jeopardize the integrity of bridge structures. During the past 25 years these conditions have developed in a number of bridges, resulting in loss of service, costly repairs, and concern about the safety of these structures. A review of the experience with such time-dependent damage since 1970 is presented. The experience is grouped into three categories: fatigue cracking resulting from changes in structural behavior as a result of corrosion, fatigue cracking resulting from development of corrosion notches in members, and stress corrosion of high-strength steel and weld metal. The examples cited illustrate the role of corrosion phenomena in bridge service and the need to control the corrosion conditions on bridge structures.

Resistance and Time-Variant Reliability Updating of Existing Bridge Structures Based on Proof Loads

2013 ◽  
Vol 540 ◽  
pp. 37-46 ◽  
Author(s):  
Da Gang Lu ◽  
Xue Ping Fan ◽  
Dong Fang Li
Keyword(s):  
Normal Distribution ◽  
Time Dependent ◽  
Reliability Model ◽  
Numerical Examples ◽  
Reliability Indices ◽  
Existing Structures ◽  
Bridge Structures ◽  
Existing Bridges ◽  
Stochastic Loads

Based on the characteristics of existing structures, the analyses were presented for an effect on the resistance of existing structures by using deterministic loads and stochastic loads. The calculating equations of the normal distribution and logarithmic normal distribution resistance under the deterministic proof load and the stochastic proof load were presented. Some valuable conclusions have been obtained for the calculating reliability of the existing structures. Based on the conclusions, time-dependent reliability model of the existing bridges was updated, the time-dependent reliability indices were solved with time integrated-discretized approach, and finally the numerical examples were presented.

Optimum Design of a Dynamic Micro-Mixer for Multiphase Flow

2007 ◽  
Vol 353-358 ◽  
pp. 2836-2838
Author(s):  
Seok Young Han ◽  
J.Y. Park ◽  
Y.D. Kim ◽  
S.J. An ◽  
J.S. Maeng
Keyword(s):  
Optimum Design ◽  
Lattice Boltzmann ◽  
The Other ◽  
Time Dependent ◽  
Index Formula ◽  
Lattice Boltzmann Methods ◽  
Design Variables ◽  
Karman Vortex ◽  
Dependent Flow ◽  
Micro Mixer

An active micro-mixer equipped with an oscillating stirrer is considered by analyzing the mixing behaviors, i.e. the effect of the Karman vortex, the flow structure after the stirrer, etc. The mixing was calculated by the D2Q9 model of Lattice Boltzmann methods. In this study, the time– averaged mixing index formula, I D , is newly proposed for time dependent flow. Three models are tested and the mixing indices are compared. From the results, it was found that the mixing of Model III is enhanced and stabilized much more than the other models. Therefore, an optimum design for a dynamic micro-mixer with an oscillating stirrer was performed. The design variables were established as the length, the angle and frequency of the stirrer. It is found that the optimal design variables are determined by 0.66, 107.9 o and 0.49 Hz.

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