Effect of pavement maintenance cycle on the fatigue reliability of simply-supported steel I-girder bridges under dynamic vehicle loading

2017 ◽  
Vol 133 ◽  
pp. 124-132 ◽  
Author(s):  
Lu Deng ◽  
Wei Wang ◽  
C.S. Cai
Keyword(s):  
Fatigue Reliability ◽  
Pavement Maintenance ◽  
Simply Supported ◽  
Girder Bridges ◽  
Vehicle Loading ◽  
Maintenance Cycle

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.

Theoretical analysis of simply supported channel girder bridges

2015 ◽  
Vol 56 (2) ◽  
pp. 241-256 ◽  
Author(s):  
Hong-Song Hu ◽  
Jian-Guo Nie ◽  
Yu-Hang Wang
Keyword(s):  
Theoretical Analysis ◽  
Simply Supported ◽  
Girder Bridges

A new seismic design method of simply supported girder bridges for very rare ground motions in the transverse direction

2020 ◽  
pp. 002072092094059
Author(s):  
Tianbo Peng ◽  
Haoyu Zou ◽  
Lizhi Wang
Keyword(s):  
Seismic Hazard ◽  
Seismic Design ◽  
Seismic Isolation ◽  
Transverse Direction ◽  
Design Method ◽  
Safety Evaluation ◽  
Seismic Safety ◽  
Simply Supported ◽  
Girder Bridges ◽  
Seismic Design Method

In most seismic design codes, usually two seismic hazard levels are taken into account, for example, Design Earthquake and Maximum Considered Earthquake. Several disastrous earthquakes have proved that seismic safety evaluation may underestimate seismic risks, which would result in serious damage of bridge structures. Therefore, a new higher level of seismic hazard named Very Rare Ground Motion (VRGM for short) is proposed innovatively to be considered in this paper for very important bridges. A novel seismic design method of simply supported girder bridges in the transverse direction for VRGMs is proposed at first. In the proposed method, seismic isolation bearings, tension-only braces and ductile piers are combined to improve the seismic performance and meet seismic requirements of VRGMs. Taking a simply supported girder bridge as a numerical analysis example, the proposed method is compared with two bridge seismic design methods adopted in current seismic codes and its parametric analysis is conducted. It’s shown that the proposed seismic design method can combine the ductility capacities of piers and the functions of seismic isolation bearings and reduce all the concerned structural seismic responses in VRGMs effectively. This work provides an educational demonstration for engineers dealing with similar problems.

Sign in / Sign up

Export Citation Format

Share Document