Number of stress cycles for fatigue design of simply-supported steel I-girder bridges considering the dynamic effect of vehicle loading

2016 ◽  
Vol 110 ◽  
pp. 70-78 ◽  
Author(s):  
Wei Wang ◽  
Lu Deng ◽  
Xudong Shao
Keyword(s):  
Dynamic Effect ◽  
Simply Supported ◽  
Girder Bridges ◽  
Fatigue Design ◽  
Vehicle Loading ◽  
Stress Cycles

Closure to “Stress Cycles for Fatigue Design of Railroad Bridges”

1977 ◽  
Vol 103 (5) ◽  
pp. 1179-1181
Author(s):  
Roman Wolchuk ◽  
Ronald M. Mayrbaurl
Keyword(s):  
Railroad Bridges ◽  
Fatigue Design ◽  
Stress Cycles

The Iterative Method for Reliability Estimation of Fatigue Life

2012 ◽  
Vol 249-250 ◽  
pp. 628-631
Author(s):  
Xin Li Bai ◽  
Peng Xu ◽  
Jiang Yan Li
Keyword(s):  
Fatigue Life ◽  
Design Method ◽  
Estimation Method ◽  
Engineering Application ◽  
Reliability Estimation ◽  
Fatigue Reliability ◽  
Reliability Design ◽  
Fatigue Design ◽  
Machine Parts ◽  
Stress Cycles

The expression of reliability estimation method for fatigue life of machine parts was derived, and two kinds of stress cycles (reversed cycle and un-symmetric reversed cycle) were considered. An iteration method is presented and the corresponding computer program named STRENGTH-2 is developed for estimating reliable life of machine parts. The engineering application results show that the calculated results are close to experimental results. The proposed method can be convenient to carry out the fatigue reliability design for machine parts under the action of uni-axial and multi-axial loadings, and promote the popularization and application of existing anti-fatigue design method. It has the high value of engineering application.

Dynamic Response of Simply-Supported Curved Girder Bridges due to Vehicles

2011 ◽  
Vol 255-260 ◽  
pp. 1825-1829
Author(s):  
Jian Qing Bu ◽  
Gen Wang Li
Keyword(s):  
Dynamic Response ◽  
Impact Factor ◽  
Torsion Angle ◽  
Radius Of Curvature ◽  
Vertical Deflection ◽  
Simply Supported ◽  
Girder Bridges ◽  
Bridge Model ◽  
Curved Girder Bridges ◽  
The Impact

The purpose of this paper, for which a finite element bridge model with 7 degrees of freedom per node and the 1/4 vehicle model with six parameters were established, is to analyze the dynamic response of curved girder bridges under vehicular loads. In the numerical simulation, the vibration characteristics of simply-supported curved girder bridge are analyzed, and the effect to the impact factors were also studied for different radiuses of curvature, eccentricities, ratios between bending and torsion stiffness, and vehicle speeds. The simulated results show that not all the first 5 natural frequencies increase with the variation of radius of curvature. The impact factor variations of vertical deflection and torsion angle are not uniform when parameters changed, and the impact factor of torsion angle would be much larger than that of vertical deflection under the same conditions.

Effects of friction-based fixed bearings on seismic performance of high-speed railway simply supported girder bridges and experimental validation

2018 ◽  
Vol 22 (3) ◽  
pp. 687-701 ◽  
Author(s):  
Lizhong Jiang ◽  
Shanshan Cao ◽  
Biao Wei
Keyword(s):  
Friction Coefficient ◽  
Seismic Performance ◽  
High Speed ◽  
Dynamic Test ◽  
Seismic Damage ◽  
Damage State ◽  
High Speed Railway ◽  
Simply Supported ◽  
Girder Bridges ◽  
Seismic Force

This study investigated the seismic performance of simply supported girder bridges with a span length of 32 m. Those bridges were a common part in China’s high-speed railway system and used spherical bearings to connect girders and piers. First, a finite element model of the scaled bridge with a geometrical similarity ratio of 1:8 was established by OpenSees. Second, five seismic damage states of fixed bearings and piers were defined based on the deformation failure criterion. Finally, an incremental dynamic analysis and a pseudo-dynamic test were performed to evaluate the effects of friction-based fixed bearings on the seismic response and damage state of bearings and piers. Results show that the sliding of friction-based fixed bearings effectively restricts the force transmitting between piers and girders, and reduces the seismic damage of piers. Those bearings with a small friction coefficient lead to a large relative displacement between piers and girders, while those bearings with a large friction coefficient cause a large seismic force exceeding the yield load of piers. Therefore, an appropriate friction coefficient of friction-based fixed bearing should be determined to achieve an optimal seismic performance of bridge according to the specific conditions of bridge and ground motion inputs.

Sign in / Sign up

Export Citation Format

Share Document