Near-Fault Seismic Response Analysis of Bridges Considering Girder Impact and Pier Size

An, Wenjun; Song, Guquan; Chen, Shutong

doi:10.3390/math9070704

Cited by 6 publications

(8 citation statements)

References 19 publications

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“…The vertical dynamic response of the bridge refers to [20,21]. Near-fault earthquakes may contain pulse-type earthquakes, which transfer most of the energy of the ground motion to structures in a short time.…”

Section: Vertical Dynamic Responsementioning

confidence: 99%

“…When the compressive stiffness of the bearing is low, the calculated force is unreasonable. The authors of [20,21] analyzed the influence of separation on the failure of a bridge pier under vertical and longitudinal excitation, but did not provide a qualitative discussion on separation conditions and only considered the flexural failure of the bridge pier.…”

Section: Introductionmentioning

confidence: 99%

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Failure Mode Analysis of Bridge Pier Due to Eccentric Impact Based on Separation of Pier and Beam

An¹,

Zhang²,

Kang³

et al. 2023

Sustainability

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By considering the near-field vertical seismic spectrum and calculating the change in vertical contact force between the main beam and the pier, the possible vertical separation contact condition of a bridge is deduced. By calculating the extreme value of the pier–beam vertical contact force and the longitudinal deformation of the pier under the structural separation, the influence of the separation on the failure of the pier is determined. Separation increases the risk of pier failure under compression, bending, and shear, and different separation times lead to different longitudinal responses from the pier, and the first failure mode is different. Therefore, it is of great significance to reasonably design bridges near faults.

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Section: Vertical Dynamic Responsementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Failure Mode Analysis of Bridge Pier Due to Eccentric Impact Based on Separation of Pier and Beam

An¹,

Zhang²,

Kang³

et al. 2023

Sustainability

Self Cite

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“…The in uence of vertical excitation on the vertical contact force of pier beams was not considered; 2. Vertical excitation may cause separation between piers and beams [18,19], which can cause structural collisions and changes in dynamic displacement. Although research has been conducted on the pier failure caused by the separation of piers and beams [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…Vertical excitation may cause separation between piers and beams [18,19], which can cause structural collisions and changes in dynamic displacement. Although research has been conducted on the pier failure caused by the separation of piers and beams [18,19]. However, the in uence of the above calculation separation on the pier failure is carried out using the vertical and longitudinal decoupling method, ignoring the mutual in uence of the vertical and longitudinal dynamic deformation response.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Study on Dynamic Stability of High Bridge Piers Under Near-Fault Earthquake

Zhou

Kang

et al. 2023

Preprint

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Select a double span box girder bridge as the analysis model, the vibration control differential equation of ultra-high pier is established, solved by the Runge-Kutta method with variable step length, combined with B-R motion criterion, the dynamic response of ultra-high pier induced by vertical seismic excitation is calculated, and the instability mechanism is studied. Theoretical analysis shows that for high piers, ignoring the bidirectional coupling effect will underestimate the dynamic response of piers. The vertical seismic excitation results in the increase of the axial pressure of bridge pier, which will increase the horizontal deformation of pier. The separation of the main beam and bridge pier will change the extreme deformation value of the bridge pier and increase the risk of pier instability. It has important guiding significance for the theoretical analysis and engineering practice of dynamic instability of ultra-high pier.

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“…Continuous bridge is one of the common types of highway seamless structure without expansion joints. However, its construction process is more complicated and the response to imposed deformations, as temperature and foundation settlements (An et al, 2021;Chen et al, 2021), is less efficient. A link slab in steel-concrete composite bridges joins the concrete slab of two spans together but keeps the steel beams disconnected, in a so-called "semi-continuous" solution.…”

Section: Structural Formmentioning

confidence: 99%

Structural performance of continuous composite bridges with partial shear connection and double composite action

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(English) The steel-concrete composite structural solution has been widely applied in the execution of simply supported bridges since the merits of concrete compressive strength and steel tensile strength can be efficiently utilized. However, there is an inverse stress situation in the hogging moment region of a continuous composite girder, where the concrete tensile cracks and steel buckling are both likely to happen. Normal composite bridges adopt Full Shear Connection (FSC) due to convenient construction and clear mechanical properties. However, large tensile stress in concrete is generated in hogging moment regions in continuous girders. In response to this issue, Partial Shear Connection (PSC) achieved by reducing shear connection efficiency in hogging moment region of continuous composite bridge can help to decrease the interaction extent between concrete slab and steel girder, thus reducing the concrete cracking and simultaneously maintaining the ultimate bearing capacity and overall stiffness of the structure. Meanwhile, casting an extra concrete bottom layer to a steel-concrete composite box girder (double composite action) in a hogging moment region can also prevent steel buckling and improve the mechanical performance of the continuous composite bridge. In order to study the structural performance of composite girder with PSC and double composite action, this thesis presents an in-depth study through the combination of experimental, numerical and analytical studies as follows: (1) To study the mechanical properties of the rubber sleeved stud connector, five groups of 15 push-out specimens were fabricated and tested. Numerical models were established. The results of the test and numerical analysis show that the rubber sleeved stud (RSS) connector effectively reduces the shear stiffness of the push-out specimen without changing the load carrying capacity. (2) To study the structural performance of composite girders with partial shear connection, four simply supported composite girder specimens and two continuous composite girder specimens were fabricated and tested by static loading tests. The mechanical behaviour of the hogging moment regions of each specimen was compared and based on them, the theoretical background was settled for the practical application of partial shear connection in composite bridges. (3) A case study of Qiwu bridge in Jiangxi Province (China) using partial shear connection action was introduced. A nonlinear finite element model of Qiwu Bridge was established through ABAQUS to simulate and predict the mechanical properties and structural performance. Based on the FEM results, the influence of partial shear connection on various parameters were analysed by performing a parametric analysis. Monitoring of the bridge during the construction and in service stages is also carried out in order to check the design rules derived in this thesis in a real bridge (4) A static loading test on a large-scaled two-span continuous girder specimen with the double composite action in hogging moment region was conducted for mechanical investigation. In parallel, a parametric analysis was carried out as well for a rational design scheme of the double composite section. (Español) La solución mixta acero-hormigón se ha utilizado ampliamente en la construcción de puentes simplemente apoyados, ya que en esta configuración longitudinal es como mejor se aprovecha la alta resistencia a compresión del hormigón junto con la alta resistencia a tracción del acero. Sin embargo, la solución se vuelve contraproducente en la zona de flexión negativa de puentes continuos, donde la fisuración a tracción del hormigón y la abolladura del acero son fenómenos probables. Los puentes mixtos adoptan ua solución de conexión completa (CC) debido a la facilidad constructiva y respuesta estructural. Para reducir las tensiones de tracción en la zona de flexión negativa, una solución alternativa es la conexión parcial (CP), que ayuda a reducir la interacción entre la losa de hormigón y la viga de acero, reduciendo la fisuración en el hormigón aunque manteniendo la resistencia y la rigidez global de la estructura. Por otro lado, colocar un recrecido de hormigón en la zona inferior de la zona de apoyos (doble acción mixta) puede prevenir la abolladura de las chapas metálicas y mejorar la respuesta de los puentes mixtos continuos. Con el objetivo de estudiar el comportamiento estructural de puentes mixtos continuos con conexión parcial y doble acción mixta, en esta tesis se desarrolla un estudio completo combinando experimentación con soluciones numérica y analíticas con el siguiente contenido: (1) Estudiar las propiedades mecánicas del conector enfundado en neopreno (CEN), mediante el ensayo push-out en laboratorio de 5 grupos de 15 muestras y establecer modelos numéricos de su comportamiento estructural. Los resultados experimentales y estudios numéricos han puesto de manifiesto que este tipo de conector reduce de manera efectiva la rigidez transversal sin variar la capacidad de carga. (2) Estudiar el desempeño de vigas mixtas con conexión parcial, mediante el ensayo en laboratorio de 4 vigas simplemente apoyadas y dos vigas continuas mixtas, cargadas estáticamente hasta rotura. Mediante la comparación de la respuesta estructural en la zona de flexion negativa de cada viga se han obtenido conclusiones en relación a la aplicación práctica de la conexión parcial en puentes mixtos continuos. (3) Analizar la posibilidad de la solución de puentes mixtos semi-continuos y conexión parcial a través de la construcción del puente Qiwu en la provincia de Jiangxi (China). Mediante un modelo de elementos finitos (ABAQUS) del puente se ha simulado la respuesta estructural, analizando los efectos de la conexión parcial en varios parámetros de diseño. Al mismo tiempo, se ha llevado a cabo la monitorización durante las fases de construcción y servicio para verificar los resultados del estudio. (4) Se ha hecho un estudio experimental y teórico de la doble acción mixta, lo cual ha permitido obtener unos criterios de diseño para puentes continuos con este tipo de solución.

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Near-Fault Seismic Response Analysis of Bridges Considering Girder Impact and Pier Size

Cited by 6 publications

References 19 publications

Failure Mode Analysis of Bridge Pier Due to Eccentric Impact Based on Separation of Pier and Beam

Failure Mode Analysis of Bridge Pier Due to Eccentric Impact Based on Separation of Pier and Beam

Theoretical Study on Dynamic Stability of High Bridge Piers Under Near-Fault Earthquake

Structural performance of continuous composite bridges with partial shear connection and double composite action

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