The effect of curvature angle of curved RC box-girder continuous bridges on their transient response and vertical pounding subjected to near-source earthquakes

Tamaddon, S.; Hosseini, Mahmood; Vasseghi, A.

doi:10.1016/j.istruc.2020.09.019

Cited by 17 publications

(2 citation statements)

References 30 publications

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“…One such issue is the displacement of the superstructure, which significantly affects the normal usage of the bridges. Among them, medium and small span curved continuous girder bridges are more prone to superstructure displacement due to their complex structure and load-bearing characteristics, especially under the long-term effects of various loads [7][8][9]. Analyzing the causes of bridge displacement, a common problem, is of significant importance in improving the efficiency of addressing this structural issue and reducing the occurrence of such problems in medium and small span bridges in China.…”

Section: Introductionmentioning

confidence: 99%

Causes and analysis of position offset of curvilinear continuous beam bridge

Zheng,

Guan

2024

Archives of Civil Engineering

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This study investigates the problem of beam deflection in curved continuous beam bridges. Taking the D0–D6 spans of the Gongbin Road viaduct as a basis, the main factors influencing the deflection of curved beam bridges are analyzed. The Midas/Civil finite element simulation software is used to calculate and analyze the causes of transverse and longitudinal deflection in curved beam bridges. The results show that the main influencing factor for beam deflection during operation is the system temperature, which causes a displacement greater than the combined displacement caused by self-weight, construction stage, gradient load, vehicle load, and bearing settlement. Damages to expansion joints during operation change the boundary conditions of the beam, preventing longitudinal free expansion under temperature load, and increasing the transverse displacement to 2–3 times the normal working state of the expansion joint, resulting in beam deflection. In the design phase, the selection of curvature radius and fixed support displacement is also a major factor affecting deflection. The smaller the curvature radius, the greater the influence on transverse and longitudinal deflection of the beam. However, when the curvature radius R is greater than 400 m, the impact on beam deflection can be neglected. The closer the fixed support position is to the ends of the bridge, the higher the possibility of bearing detachment, ultimately leading to beam deflection.

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Section: Introductionmentioning

confidence: 99%

Causes and analysis of position offset of curvilinear continuous beam bridge

Zheng,

Guan

2024

Archives of Civil Engineering

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“…On the other hand, for piers, ductile demand will increase for short piers. Tamaddon et al [29] proposed a theoretical method using structural dynamic relationships to assess the effect of central angle on the seismic response of curved bridges with rubber bearings exposed to strong vertical ground motions.…”

Section: Introductionmentioning

confidence: 99%

Seismic Resilience Assessment of Curved Reinforced Concrete Bridge Piers through Seismic Fragility Curves Considering Short- and Long-Period Earthquakes

Uenaga,

Omidian,

George

et al. 2023

Sustainability

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Curved bridges are commonly used for logistics and emergencies in urban areas such as highway interchange bridges. These types of bridges have complicated dynamic behaviors and also are vulnerable to earthquakes, so their functionality is a critical parameter for decision makers. For this purpose, this study aims to evaluate the bridge seismic resilience under the effects of changes in deck radius (50, 100, 150 m, and infinity), pier height irregularity (Regular and Irregular), and incident seismic wave angle (0°, 45°, and 90°) under short- and long-period records. In the first step, fragility curves are calculated based on the incremental dynamic analysis and probabilistic seismic demand models. Finally, seismic resilience curves/surfaces are constructed and their interpolated values of the log-normal distribution function presented for assessing system resilience. It is found that when long-period records are applied in one given direction, the angle of incidence has the most significant effect on seismic resilience, and bridges are most vulnerable when the angle of incidence tends to 0°. The effect of deck radius on seismic resilience became more remarkable as the angle of incidence increased. Additionally, results indicate that the bridge vulnerability in long-period records is more significant than that under short-period records.

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