Seismic Pounding Mitigation of an Existing Cable-Stayed Bridge Using Metallic Dampers

2018 ◽  
Author(s):  
Ahad Javanmardi ◽  
Khaled Ghaedi ◽  
Zainah Ibrahim ◽  
Karuppiah Udayar Muthu
Keyword(s):  
Time History ◽  
Element Model ◽  
Steel Cable ◽  
Cable Stayed Bridge ◽  
Metallic Dampers ◽  
Nonlinear Time History ◽  
Performance Results ◽  
The Comparative Study ◽  
Seismic Pounding ◽  
The Impact

<p>This paper aims to mitigate the seismic pounding effects on an existing steel cable-stayed bridge through the implementation of metallic dampers. The earthquake-induced pounding phenomena were reported on the bridge in 1988. To aid the aim, a finite element model of the bridge is created and the nonlinear time-history is performed to assess the impact of the proposed control system on the bridge seismic performance. Results of the comparative study showed that the seismic pounding significantly mitigated by metallic dampers and the global seismic responses of the bridge enhanced, relatively.</p>

scholarly journals Seismic Performance of a Green Roof Structure

2021 ◽  
Vol 13 (8) ◽  
pp. 4278
Author(s):  
Svetlana Tam ◽  
Jenna Wong
Keyword(s):  
Green Roof ◽  
Time History ◽  
Green Roofs ◽  
Moment Frame ◽  
Steel Moment Frame ◽  
Roof Structure ◽  
Nonlinear Time History Analyses ◽  
Vegetated Roofs ◽  
Nonlinear Time History ◽  
The Impact

Sustainability addresses the need to reduce the structure’s impact on the environment but does not reduce the environment’s impact on the structure. To explore this relationship, this study focuses on quantifying the impact of green roofs or vegetated roofs on seismic responses such as story displacements, interstory drifts, and floor level accelerations. Using an archetype three-story steel moment frame, nonlinear time history analyses are conducted in OpenSees for a shallow and deep green roof using a suite of ground motions from various distances from the fault to identify key trends and sensitivities in response.

Dynamical Analysis of a Cable-Stayed Bridge with One Tower

2014 ◽  
Vol 501-504 ◽  
pp. 1292-1296
Author(s):  
San Peng Cao ◽  
Xiang Bin Meng ◽  
Yue Zhen Han
Keyword(s):  
Dynamic Characteristics ◽  
Time History ◽  
Internal Force ◽  
Calculation Model ◽  
Nonlinear Time History Analysis ◽  
Dynamical Analysis ◽  
Critical Position ◽  
Cable Stayed Bridge ◽  
Double Beam ◽  
Nonlinear Time History

With a double-beam calculation model, the study on dynamic characteristics of the cable-stayed bridge with one tower was carried out. Modal analysis and space nonlinear time history analysis were adopted.The latter used EI-Centro earthquake wave, it acted on the structure from three different direction:transverse, longitudinal and vertical respectively. From these analysis, dynamic characteristics of the bridge are acquired, internal force and displacement in critical position of the beam and tower are given too. At the same time, wind-resistant stability of the bridge is also calculated through a experienced formula. All the results provide important reference for design and construction.

Optimization Design of Large Span Cable-Stayed Bridge in High Seismic Risk Zone

2013 ◽  
Vol 353-356 ◽  
pp. 2015-2019
Author(s):  
Zhi Hua Xiong ◽  
Yun Cheng Feng ◽  
Song Lin Song ◽  
Jiang Bo Wang
Keyword(s):  
Optimization Design ◽  
Time History ◽  
Nonlinear Time History Analysis ◽  
Seismic Safety ◽  
Seismic Demands ◽  
Large Span ◽  
Cable Stayed Bridge ◽  
History Analysis ◽  
Ductile Steel ◽  
Nonlinear Time History

To ensure seismic safety of a large span cable-stayed bridge, two alternative pylon shapes and section types were studied. Nonlinear time history analysis was performed in the context. It is found that the A-shaped pylon is much stiffener than the H-shaped pylon in terms of deformation. The steel A-shaped pylon can significantly reduce the seismic demands of the key member including tower drift and moment. A ductile steel link between towers is proposed for the optimization of design in the paper. The A-shaped reinforced concrete tower with ductile steel link was proved to be a relatively balanced plan considering engineering, aesthetic and economic factors.

Beam-column modeling and seismic fragility analysis of a prestressed segmental concrete tower for wind turbines

2020 ◽  
Vol 23 (8) ◽  
pp. 1715-1727
Author(s):  
Yuqi Cao ◽  
Minjuan He ◽  
Renle Ma ◽  
Rongchang Yang ◽  
Feng Liang
Keyword(s):  
Time History ◽  
Element Model ◽  
Column Model ◽  
Average Curvature ◽  
Proposed Model ◽  
Nonlinear Time History Analyses ◽  
Engineering Demand Parameter ◽  
Earthquake Action ◽  
Nonlinear Time History ◽  
Good Agreement

As the development of wind energy in earthquake areas advances, the seismic performance of concrete supporting towers has become an important subject. A beam-column model is developed for a prestressed segmental concrete tower supporting a wind turbine considering the properties of dry joints. The proposed model is in good agreement with the solid element model deformation results and the field test modal results. Based on the beam-column model, nonlinear time history analyses considering uncertainties are conducted to evaluate the behavior of the prototype tower under earthquake action. In the process, a new engineering demand parameter, called the average curvature, is defined. The results are compared with those based on a conventional engineering demand parameter. The availability of the prototype tower under earthquake action and the effectiveness of the newly defined engineering demand parameter are validated.

Seismic Response Analysis of Cable-Stayed Bridges

2012 ◽  
Vol 446-449 ◽  
pp. 2290-2294
Author(s):  
Wen Liang Qiu ◽  
Meng Jiang ◽  
Xing Bo Zhang
Keyword(s):  
Time History ◽  
Element Model ◽  
Response Analysis ◽  
Longitudinal Displacement ◽  
Seismic Responses ◽  
Cable Stayed Bridge ◽  
Optimum Parameters ◽  
History Analysis ◽  
Floating System ◽  
Main Bridge

For floating system cable-stayed bridge, the longitudinal displacement of stiffening girder and moments of towers are very large when strong earthquake happens. Too large displacement of stiffening girder leads to collision between girders of the main bridge and the approaches. Using spatial finite element model and time history analysis method, the seismic responses of cable-stayed bridge are studied considering the elasto-plastic effects. The results show that the displacement of stiffening girder is very large when no seismic reduction measures are adopted. The viscous dampers installed between the stiffening girder and towers can efficiently reduce seismic responses of the cable-stayed bridge. Especially, the displacement of stiffening girder can be controlled well to meet the design requirement. Using the optimum parameters of damper, the height of pier under tower and intermediate supports in side span on seismic responses are studied in detail. The longitudinal displacement of stiffening girder increases with the pier height increasing. The intermediate supports in side span are benefit for seismic reduction.

Assessment of an old roadway bridge under static and seismic loading conditions

2021 ◽  
Vol 7 (2) ◽  
pp. 107
Author(s):  
Abdulkadir Cüneyt Aydın ◽  
Mehmet Fatih Yılmaz
Keyword(s):  
Service Life ◽  
Negative Impact ◽  
Time History ◽  
Site Investigation ◽  
Element Model ◽  
Detailed Examination ◽  
Railway Transportation ◽  
Railway Bridges ◽  
Earthquake Loads ◽  
Nonlinear Time History

A large proportion of road and railway bridges, present in Turkey served for many years, have been completed their service life or will soon. Continuing safety and sustainability of these bridges under traffic loads have been of great increasing importance to roadway and railway transportation line to be continuous servicing. In addition, the demolition and reconstruction of bridges that have reached the end of their service life or are nearing completion will have a negative impact on the country's economy. All of these requirements' detailed examination of bridges in order to provide economical and safe service, considering current vehicle loads and earthquake loads. The Mahmutçavuş Bridge is investigated as a simply supported continuous composite roadway bridge at this work. The finite-element model of the bridge is constituted by site investigation and measurement. Different truckloads using for the design of the bridge are determined, and static analysis of the bridge is conducted. Seven earthquake records are scaled for two different earthquake design spectrums. The nonlinear time-history analyses are conducted, considering Δ-δ effects. The performance of the bridge for varying truckloads and earthquake loads is investigated, and results are discussed in detail.

scholarly journals Dynamic effects induced by the impact of debris flows on protection barriers

2018 ◽  
Vol 10 (1) ◽  
pp. 116-131 ◽  
Author(s):  
Maddalena Marchelli ◽  
Valerio De Biagi
Keyword(s):  
Impact Force ◽  
Time History ◽  
Element Model ◽  
Interaction Force ◽  
Accurate Analysis ◽  
Vibration Period ◽  
Time Histories ◽  
Mode Vibration ◽  
Force Time ◽  
The Impact

Debris flow is a transient phenomenon that causes large disasters. Retaining systems, whose design is still nowadays a crucial issue, can mitigate this risk. Multiple surges can arise during this phenomenon; thus, an accurate analysis might consider the impact force time histories rather than only its maxima. The aim of this work is to analyze the effects of the interaction between the debris and the barrier during one surging phenomenon. A discrete element model models the granular motion and the interaction between the debris and a rigid open barrier set at the end of the channel. The estimated interaction force time history is then used as input impact force for the dynamic structural analyses of the piles. A total of 12 different structural sections are adopted and the internal forces at the base are critically compared. It results that the first mode vibration period is the parameter that largely affects the behavior of the piles.

Longitudinal Vibration Control of Long-Span Railway Cable-Stayed Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1795-1799
Author(s):  
De Shan Shan ◽  
Yuan He ◽  
Li Qiao
Keyword(s):  
Vibration Control ◽  
Longitudinal Vibration ◽  
Time History ◽  
Bending Moment ◽  
Element Model ◽  
Viscous Dampers ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Two Parameters ◽  
Main Girder

As the floating type cable-stayed bridge has no longitudinal constraint between the main girder and the pylon, it may cause the main girder a large longitudinal displacement and the root of tower a large longitudinal bending moment, and affect the normal use and safety of the bridge under the earthquake or the train braking. It is an important part of the design to select an appropriate vibration control scheme. Taking a long-span railway bridge for example, this paper build the finite element model and analyses the damping effect in the view of train braking, moreover, the present study also examines the dynamic behavior with focus on two parameters of damping coefficient C and damping exponent αof the viscous dampers through dynamic time-history analysis. The results show that setting viscous dampers with the reasonable parameters can reduce the vibration and the response of the bridge by train braking and have a good energy dissipation effect.

Dynamic Response Analysis of Xi'an Bell Tower Timber Structure under the Metro-Vibration Loading of Line 2 and 6

2013 ◽  
Vol 353-356 ◽  
pp. 1732-1738
Author(s):  
Zhao Bo Meng ◽  
Teng Fei Zhao ◽  
Jie Jin ◽  
Xi Feng Li
Keyword(s):  
Technical Specification ◽  
Interaction Model ◽  
Time History ◽  
Element Model ◽  
Response Analysis ◽  
Winkler Foundation ◽  
Analysis Model ◽  
Bell Tower ◽  
Dimensional Finite Element ◽  
The Impact

The effects of metro line 2 and line 6 on Xi'an Bell Tower was studied by numerical analysis in this paper. At first, according to the theory of Euler-Bernoulli beam in Winkler foundation, the analysis model of train-track-foundation system was established, and then, time-history curve of metro-induced loading acts on tunnel structure is obtained by using Matlab produce platform. Secondly, two-dimensional finite element model of the structure-soil-tunnel interaction model was established using ANSYS. Finally, the impact of metro line 2 and 6 and ground transportation on Xi’an Bell Tower was evaluated according to the Technical specification for protection of historic buildings against man-made vibration. The construction of Metro Line 2 and Line 6 will affect the safety of Xi'an Bell Tower.

Seismic Response Reduction of Cable-Stayed Bridge with Viscous Dampers

2011 ◽  
Vol 137 ◽  
pp. 154-158
Author(s):  
Wen Liang Qiu ◽  
Meng Jiang ◽  
Xing Bo Zhang
Keyword(s):  
Seismic Waves ◽  
Time History ◽  
Longitudinal Direction ◽  
Element Model ◽  
Design Parameters ◽  
Longitudinal Displacement ◽  
Cable Stayed Bridge ◽  
History Analysis ◽  
Floating System ◽  
The Cost

For floating system cable-stayed bridge, the longitudinal displacement of girder and moments of towers are very large when strong earthquake happens. The dampers installed between girder and towers in longitudinal direction can reduce efficiently displacement of the girder and moments of the towers induced by longitudinal seismic waves. Using spatial finite element model and time history analysis method, the influences of design parameters of viscous damper on seismic responses of cable-stayed bridge are studied in detail. The results of study show that, with the damping constant increasing, the longitudinal displacement of girder and moment of tower decrease, and the forces of damper increase. With velocity exponent increasing, the longitudinal displacement of girder and moment of tower increase, and the force of damper decrease. So, when determining the design parameters of damper, the cost of dampers, difficulty of construction and seismic reduction effects should be considered together.

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