Study on Space Nonlinear FE Model of Composite Beam Cable-Stayed Bridge with Three Towers

2011 ◽  
Vol 90-93 ◽  
pp. 975-978
Author(s):  
Feng Wang
Keyword(s):  
Composite Beam ◽  
Shell Element ◽  
Element Model ◽  
Internal Force ◽  
Fe Model ◽  
Beam Model ◽  
Single Beam ◽  
Cable Stayed Bridge ◽  
Double Beam ◽  
Nonlinear Finite Element Model

Taking Wuhan Erqi Yangtze River Bridge as an example, based on link element, shell element, and beam element, a double beam nonlinear finite element model is purposed using popular finite analyzing software ANSYS. The internal force and deformation characteristics of composite beam cable-stayed bridge with three towers is analyzed by double beam model, and compared to the single beam. The results show that the double beam nonlinear FE model, which have less freedom and conveniently calculate, can be used to well analyze the nonlinear of composite beam cable-stayed bridge with three towers.

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.

scholarly journals Dynamic Analysis of Vehicle Track Coupling Based on Double Beam Track Model

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Yayun Qi ◽  
Huanyun Dai ◽  
Jianjin Yang ◽  
Kun Xu
Keyword(s):  
Frequency Band ◽  
High Frequency ◽  
Harmonic Excitation ◽  
Vertical Acceleration ◽  
Beam Model ◽  
Vertical Force ◽  
Nonlinear Method ◽  
Single Beam ◽  
Double Beam ◽  
Random Irregularity

The rail was considered as double Timoshenko beam in this paper, applied to the vehicle track coupling dynamics model; the Hertz nonlinear method is used to calculate the wheel rail contact force. Wheel rail vertical force and response of vehicle are calculated by using the model under random irregularity and single harmonic excitation; at the same time, wheel rail force and vertical acceleration response of 3-order, 10-order, and 19-order wheel polygon were calculated. The results show that, under the excitation of random irregularity, the wheel rail vertical force of two models was very close in the low frequency band, and the response of the double beam model in the high frequency band of 200–1000 Hz is larger than the single beam model, and the acceleration and displacement responses of the double beam model are relatively close. Under a single harmonic excitation, the double beam model has a shorter wheel rail force attenuation time than that of the single beam model. And wheel rail force peak value of double beam model is 9% larger than that of single beam model. Similarly, the vertical displacement of the double beam model increased by 2.6%. Under the 3-order and 10-order wheel polygon excitation, vertical wheel rail peak force of double beam is, respectively, 37.5% and 50% larger than single beam model; the vertical frame acceleration amplitude is 1 g and 1.7 g; under the 19-order polygon wheel excitation, the difference of the wheel rail force between two models is very small, and the amplitude of acceleration of bogie is 2.3 g. And double beam model has more advantage in analyzing high frequency problems such as wheel polygonization.

scholarly journals Transfer Matrix Method for Dynamic Characteristics Analysis of Missile-Canister System in Silo

2020 ◽  
Vol 319 ◽  
pp. 01001
Author(s):  
Anfeng Zhou ◽  
Daokui Li ◽  
Shiming Zhou ◽  
Da Cui ◽  
Xuan Zhou
Keyword(s):  
Transfer Matrix ◽  
Dynamic Characteristics ◽  
Transfer Matrix Method ◽  
Matrix Method ◽  
Discrete Distribution ◽  
Mode Shapes ◽  
Beam Model ◽  
Radial Vibration ◽  
Single Beam ◽  
Double Beam

In order to ensure the safety of the missile-canister system in silo during the earthquake, a modified transfer matrix method is provided to study the dynamic characteristics of the system. Firstly, a discrete viscoelastic connected double-beam model is developed taking account of the structural nonuniformity and the discrete distribution of the adapters. Secondly, the transfer matrix method of a single beam is modified to solve the problem of discrete connection between the two beams of the double-beam model. Then the natural circular frequencies and mode shapes are calculated by the proposed method, comparing with the finite element method (FEM). Finally, the influence of the stiffness of radial vibration isolators and adapters on the dynamic characteristics of the system is analysed. The comparison shows that the results of the proposed method are well consistent with the FEM calculations and the proposed method is validated. The variations of the first six natural circular frequencies with radial vibration isolator stiffness and adapter stiffness are obtained, which provides a basis for the seismic-relieving design.

Calculation and construction study for the Novel Twin-Deck Cable- Stayed Bridge with shared pylon

2021 ◽  
Author(s):  
Xiangmin Yu ◽  
Dewei Chen
Keyword(s):  
Interaction Effect ◽  
Mechanical Performance ◽  
Construction Method ◽  
Beam Model ◽  
The Novel ◽  
Plate Model ◽  
Field Surveys ◽  
Single Beam ◽  
Cable Stayed Bridge ◽  
Construction Methods

<p>Twin-deck cable-stayed bridge with shared pylon (TDBSP) is an innovative structural arrangement captured with complex mechanical performance and highly interaction effect between two bridges, as the deck layouts are asymmetrical and two bridges share one merged pylon leg. This paper explores the calculation and construction methods of TDBSP, based on the record-breaking Rod El Farag Axis Bridge. Single-beam model (SBM) and beam-plate model (BPM) are firstly established, and the numerical results are compared with field surveys as validations. Then, the interaction effect of two bridges during construction are studied, and a comparison of synchronous construction method (SCM) and asynchronous construction method (ASCM) are investigated during the construction of TDBSP.</p>

Structural Optimization of Reinforced Concrete Aqueduct with Multi-Longitudinal Beams Part I: Method

2011 ◽  
Vol 243-249 ◽  
pp. 335-338
Author(s):  
Jun Feng Guan ◽  
Xiao Ke Li ◽  
Shun Bo Zhao
Keyword(s):  
Reinforced Concrete ◽  
Tensile Stress ◽  
Crack Width ◽  
Mechanical Characteristics ◽  
Shell Element ◽  
Element Model ◽  
Optimization Method ◽  
Internal Force ◽  
Structural Deformation ◽  
Maximum Crack

Former approaches fordesigning reinforced concrete aqueduct with multi-longitudinal beams were mostly based on experience. In this study, an optimization method is proposed instead. According to the mechanical characteristics of aqueduct, optimization principlesfor structural deformation coordination and sectional crack-resisting are developed. Furthermore, in optimization of large and complex reinforced concrete aqueduct, this method employs nominal tensile stress to control the maximum crack width. In addition, a 3D beam-shell element model is suggested for calculating internal force of aqueduct.

scholarly journals Seismic Response Mitigation of a Long-Span Tower Bridge with Two Types of Constraint System

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Li Xu ◽  
Qingfei Gao ◽  
Junhao Zheng ◽  
Chuanhui Ding ◽  
Kang Liu
Keyword(s):  
Element Model ◽  
Main Beam ◽  
Seismic Load ◽  
Viscous Damper ◽  
Viscous Dampers ◽  
Damping Effect ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Drift Frequency ◽  
Nonlinear Finite Element Model

The stress of the main tower of a cable-stayed bridge depends on the connection type between the tower and deck. In order to study the most suitable longitudinal damping mode for a long-span cable-stayed bridge. In this article, a nonlinear finite element model is established based on a large span concrete cable-stayed bridge with a main span of 680 m. Without considering the influence of the transverse constraint, the damping effect of the elastic connection device and the viscous damper is simulated when the longitudinal seismic load is input. The results show that the stiffness of the main beam is increased by installing the elastic connection device, so the longitudinal drift frequency of the main beam is increased, but the stiffness of the structure is not changed by installing the viscous damper. Both viscous dampers and elastic connection structures can reduce the longitudinal displacement of the beam end, but viscous dampers are more favorable for the stress of the main tower. In terms of damping effect, viscous dampers are more suitable for long-span cable-stayed bridges, but, in terms of economy and parameter control, elastic connection devices have more advantages.

scholarly journals Study on the System Reliability of Steel-Concrete Composite Beam Cable-stayed Bridge

2016 ◽  
Vol 10 (1) ◽  
pp. 418-432 ◽  
Author(s):  
Buyu Jia ◽  
Xiaolin Yu ◽  
Quansheng Yan ◽  
Zhen Yang
Keyword(s):  
Mechanical Behavior ◽  
System Reliability ◽  
Composite Beam ◽  
Degrees Of Freedom ◽  
Failure Modes ◽  
Limit State ◽  
Element Model ◽  
Differential Method ◽  
Component Reliability ◽  
Cable Stayed Bridge

Steel-concrete composite beam cable-stayed bridge is a complicated system consisting of a composite beam, tower, and stayed cables. And the composite beam is composed of a steel beam, bridge deck and connectors, which has a different mechanical behavior from the general beam structure. In a word, the steel-concrete composite beam cable-stayed bridge is characterized by specific mechanical behavior and has many influencing factors. Thus, its safety analysis often cannot be easily implemented. This paper aims to study the component reliability of the steel-concrete composite beam based on the stochastic finite element method (SFEM) and the recognition of main failure modes in the system reliability of the cable-stayed bridge. For the component reliability of the steel-concrete composite beam, a nonlinear element model with 10 degrees of freedom (DOF) is adopted, which can consider the particular longitudinal slip effect between the steel and concrete. And the direct differential method (DDM) is used to deduce the response gradient of the element model. Meanwhile, the tower and the composite beam are considered as beam-column members to establish their limit state functions in the form of interaction equations. For the recognition of main failure modes in the system reliability, this paper proposes the concept of uniformity of the reliability index and the refinement strategy to improve theβ-unzipping method, which can identify the main failure modes or neglect the unnecessary non-main failure modes. Finally, a certain steel-concrete composite beam cable-stayed bridge is used to verify the effectiveness of the proposed method.

scholarly journals Bridge Damping Extraction Method from Vehicle–Bridge Interaction System Using Double-Beam Model

2021 ◽  
Vol 11 (21) ◽  
pp. 10304
Author(s):  
Fengzong Gong ◽  
Fei Han ◽  
Yingjie Wang ◽  
Ye Xia
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Traffic Flow ◽  
Dynamic Stiffness ◽  
Damping Ratio ◽  
Element Model ◽  
Beam Model ◽  
Modal Shape ◽  
Structural Dynamic ◽  
Double Beam

When vehicles interact with a bridge, a vehicle–bridge interaction (VBI) system is created. The frequency and modal shape of VBI systems have been widely studied, but the damping of VBI systems has not been adequately investigated. In recent years, several incidents of abnormal bridge vibration due to changes in bridge damping have occurred and aroused widespread concern in society. Damping is an important evaluation index of structural dynamic performance. Knowing the damping ratio of a VBI system is useful for analyzing the damping changes while a bridge is in service. This paper presents a method to extract bridge damping values from a VBI system, which can serve as a guide for bridge damping evaluation. First, a double-beam theoretical model was used to simplify the VBI system for cases involving uniform traffic flow. The damping ratio equation for the simplified VBI system was obtained using the extended dynamic stiffness method (EDSM). A double-beam finite element model and a VBI finite element model were established. The damping ratios of the two models were separately calculated and then compared with the simplified VBI model results. The results verified the accuracy of the simplified method. This paper then explains that bridge damping values can be extracted by estimating the equivalent traffic flow parameters and using the damping formula for the simplified VBI system. The bridge damping ratios extracted using this method in an engineering case ranged from 0.75% to 0.78%, which is smaller than the range that was directly identified using monitoring data (0.83–1.19%). The results show that the method can effectively extract bridge damping ratios and improve damping ratio identification.

Research of Random Seismic Response of Large-Span Multi-Tower Cable-Stayed Bridge

2013 ◽  
Vol 477-478 ◽  
pp. 1046-1051
Author(s):  
Cai Zhi Sun ◽  
Lei Zhao
Keyword(s):  
Seismic Response ◽  
Traveling Wave ◽  
Element Model ◽  
Internal Force ◽  
Research Subject ◽  
Wave Velocities ◽  
Cable Stayed Bridge ◽  
Constraint Relation ◽  
Vertical Displacements ◽  
Random Seismic Response

Taking Jiashao Bridge as the research subject, this paper established finite element model by ANSYS to study random seismic response of multi-tower cable-stayed bridge. The results show that the constraint relations between tower and girder influence internal force at bottom of towers deeply, and the force of each tower is different. The vertical displacements in the midspan of girder are varied in different constraint relation. In addition, the effect of traveling waves on this bridge under excitation was analyzed, the results show that traveling wave velocity has an important implication on the seismic response of multi-tower bridge, and there are some regular relations between the response of structure and high traveling wave velocities.

Calculation on Internal Force Effect of a High-Speed Highway Prestressed Concrete Extra-Dosed Cable-Stayed Bridge

2014 ◽  
Vol 580-583 ◽  
pp. 3154-3157
Author(s):  
Xing Zhou Chen
Keyword(s):  
Prestressed Concrete ◽  
High Speed ◽  
Element Model ◽  
Internal Force ◽  
Bridge Structure ◽  
Cross Sectional ◽  
Cable Stayed Bridge ◽  
Rigid Frame ◽  
Internal Forces ◽  
Design Speed

The Extra-dosed cable-stayed bridge is considered as a new popular type of bridge structure in recent 20 years, whose mechanical properties and economic span both lie between continuous beam (or rigid frame ) bridges and cable-stayed bridges. This design is a double-cable-plane (85+150+85) m prestressed concrete Extra-dosed cable-stayed bridge, whose maximum Design speed is 100km/h and its width is 25.50m. The form of the highway is sextuple line which is 10.75m far away,and the cross-sectional slope is 2%. The girder body adopts three cell and single box, the height of beam takes quadratic parabola relation, which is 5m high at the middle support, while at the side support and the midspan is 3m. Vehicle standard load was applied on the bridge. The design uses Midas/Civil to establish the finite element model that is reasonable and simple, analyzing the structure behavior of the girder body under loading, especially the internal forces of bridge structure under dead load, live load and additional force.

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