scholarly journals Torsional Stiffness Correction of the Split-Type Triple-Box Steel Box Girder Based on Refined Simulation

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Yu Tang ◽  
Min Xu ◽  
Jie Yue ◽  
Shixiong Zheng
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Reference Value ◽  
Element Model ◽  
Beam Element ◽  
Torsional Stiffness ◽  
Box Girder ◽  
Wind Resistance ◽  
Abc Algorithm ◽  
Steel Box Girder

Split-type steel box girders are widely used in long-span bridges because of their good wind-resistance performance. In the design stage, a simple finite element model is usually established based on the beam element for wind-resistance design. However, since the irregular cross-beams and diaphragms in the split steel box girder cannot be virtually established, the stiffness of the girder will be underestimated. To improve the accuracy in simulating stiffness of the split-type triple-box steel box girder (STSBG) with the beam element model (BEM), a correction is made to the initial beam element model (IBEM) based on the result of a more refined finite element model. ANSYS is adopted to make a refined model (RM) of a bridge with STSBG as its girder and to calculate its aerostatic responses and dynamic characteristics in 3 typical construction states and 1 finished state. With the reference value, an objective function of the overall residual sum of squares is constructed for the torsion angle of the girder and the frequency of the bridge. Then, the beam element is used for conventional modelling of the bridge, and artificial bee colony (ABC) algorithm is adopted for the optimization and correction of structure parameters of the BEM of the girder. Finally, static and dynamic characteristics of the IBEM and the corrected beam element model (CBEM) are compared with values of the corresponding RM to evaluate the validity of the correction of the model. The results show that the aerostatic responses and dynamic characteristics of the CBEM are close to calculated values of the RM. In more detail, the relative error between the torsion angle of the girder in the middle span of the BEM and the corresponding reference value in the finished state is decreased from +61.71% to +4.94%, and the relative error of torsional fundamental frequency is decreased from −17.43% to +3.66%. According to the calculated value of the RM, ABC algorithm would satisfactorily improve the accuracy in simulating torsional stiffness of the STSBG with the IBEM. This research is expected to provide reference for beam element modelling, which is conducive to accurately simulating torsional stiffness of the STSBG.

Mechanical Analysis of Deck Pavement of Curved Continuous Steel Box Girder

2011 ◽  
Vol 243-249 ◽  
pp. 1941-1946
Author(s):  
Mu Cao ◽  
Guo Fen Li ◽  
Hua Ping Zhu
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Mechanical Analysis ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Steel Box Girder ◽  
Deformation Features ◽  
Stress And Deformation ◽  
Steel Deck

The geometric structure of steel deck plates is complex. So it is difficult to get precise results in the mechanics calculation of deck pavement with traditional methods. This paper adopts the finite element method for the mechanics analysis of the composite guss asphalt surfacing layer of curved steel box girder bridges. By taking the orthotropic steel deck and the pavement as a whole, a reasonable finite element model is established and optimized for the mechanical study of steel deck pavement. This model can be used to study the stress and deformation features of the surfacing layer. According to the common diseases in steel deck pavements and the effect of the overload and the horizontal load in braking to the pavement, this paper puts forward the comprehensive control indicators for pavement failures.

The Local Stress Analysis for the Anchorage Zone of Tooth Plate in Steel Box Girder

2013 ◽  
Vol 477-478 ◽  
pp. 631-634
Author(s):  
Zuo Long Luo ◽  
Jiang Long Wang ◽  
Feng Hui Dong
Keyword(s):  
Finite Element ◽  
Comparative Analysis ◽  
Local Stress ◽  
Element Model ◽  
Maximum Difference ◽  
Box Girder ◽  
Steel Box Girder ◽  
Tooth Plate ◽  
The Difference ◽  
Different Parts

Calculating the local stress for the anchorage zone of each part in the tooth plate by establishing two kinds of finite element model: considering concrete effect and not considering concrete effect. The result of the comparative analysis of the two models shows that the local stress considering the concrete effect is smaller than that not considering the concrete effect and the maximum difference is about 170 MPa. The difference is not the same in different parts of the tooth plate. Although the design will be tend to be safe for not considering the concrete effect, the size of the tooth plate may increase. Therefore, in order to reduce the weight of the tooth plate , the concrete effect should be taken into consideration in the design.

The Effect of Bearing Simulation on Vibration Characteristics of a Steel Box Girder Footbridge Model

2014 ◽  
Vol 1049-1050 ◽  
pp. 392-397
Author(s):  
Ju Bing Zhang ◽  
Ying Zou ◽  
Xian Zhang
Keyword(s):  
Finite Element ◽  
Beam Element ◽  
Simulation Methods ◽  
Box Girder ◽  
Vibration Signals ◽  
Finite Element Software ◽  
Steel Box Girder ◽  
Bridge Model ◽  
Element Simulation ◽  
Bridge Bearing

The measurement and finite element simulation was used to research the effect of bearing on vibration frequency of bridge. Sixteen models accelerometer was instrumented on the bridge and the vibration signals were acquired at a sampling frequency of 512 Hz. The finite element software is adopted to establish the model of the bridge. In this paper, beam element simulation and elastic connection simulation are two ways to calculate the vibrational frequencies. Through comparison, the characteristics of the two simulation methods can be known. By this study, the bridge bearing simulation model of the bridge has an obvious impact on the frequency of bridge model. At the same time, the simulation of bridge should be as close to the reality as possible to obtain more accurate data.

Influence of External Tendons on Dynamic Characteristics of Box Girder with Corrugated Steel Webs

2010 ◽  
Vol 163-167 ◽  
pp. 2131-2136 ◽  
Author(s):  
Jian Bo Chen ◽  
Bao Dong Liu ◽  
Peng Fei Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Natural Frequency ◽  
Dynamic Characteristics ◽  
Element Model ◽  
Box Girder ◽  
External Tendons ◽  
The Impact ◽  
The Finite Element Model

Based on Miyamoto’s method, the natural frequency of prestressed box girder with corrugated steel webs considering the impact of external tendons was obtained. And the result was modified based on the finite element model. It shows that: the external tendons will reduce the natural frequency of bridge with reduced range of about 3%. Beneficial references were provided to the layout of external tendons in order to avoid the resonance between the box girder with corrugated steel webs and the external tendons.

Dynamic Characteristics Analysis and Parametric Study of a Super-Long-Span Triple-Tower Suspension Bridge

2012 ◽  
Vol 256-259 ◽  
pp. 1627-1634 ◽  
Author(s):  
Jia Wen Zhang ◽  
Wen Hua Guo ◽  
Chao Qun Xiang
Keyword(s):  
Dynamic Characteristics ◽  
Suspension Bridge ◽  
Torsional Stiffness ◽  
Mode Shapes ◽  
Suspension Bridges ◽  
Box Girder ◽  
Long Span ◽  
Steel Box Girder ◽  
Elastic Restraints ◽  
Central Buckle

Based on the Taizhou Yangtze River Bridge, a 3D finite element model is developed to establish its deformed equlibrium configuration due to dead loading. Strating from deformed configuration,a modal analysis is performed to provide the frequencies and mode shapes. The study focuses on the effects of the vertical, lateral and torsional stiffness of the steel box girder, the rigid central buckle and the elastic restraints connecting the towers and the steel box girder on the dynamic characteristics of the triple-tower suspension bridge. The results show that, variation of vertical, lateral and torsion stiffness of stiffening girders have effects on the vibration frequency in corresponding directions only and have little effects in other directions. The elastic restraints have a more significant effect on the dynamic characteristics than the central buckle, and decreasing the stiffness of the elastic restraints results in the appearance of a longitudinal floating vibration mode of the bridge. The results obtained could serve as a valuable numerical reference for analyzing and designing super-long-span tripletower suspension bridges.

scholarly journals DYNAMIC SIMULATION AND TEST ANALYSIS OF SPACE TRUSS AND LOAD STRUCTURE

2020 ◽  
Vol 5 (3) ◽  
pp. 123-133
Author(s):  
Haitao Luo ◽  
Peng Wang ◽  
Tingke Wu ◽  
Haonan Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Simulation ◽  
Dynamic Characteristics ◽  
Structural Model ◽  
Reference Value ◽  
Decisive Role ◽  
Element Model ◽  
Space Truss ◽  
The Finite Element Model

The dynamic characteristics of aerospace products play a decisive role in environmental adaptability of products, because aerospace products are subjected to vibration environment during launching process. This paper describes the design of a space truss and the load structure, in order to get the dynamic characteristics, finite element modal analysis and modal test is done on the structural model, through correlation analysis to determine the degree of conformity of the finite element model with the experimental model. It is determined that the finite element mode of truss and load structure is similar to the test mode, the finite element model is acceptable; The dynamic simulation of the structure is carried out by the qualified finite element model, and the dynamic simulation results are verified by the vibration test; The method for obtaining the dynamic characteristics of aerospace products and the way of dynamic simulation for launching process is of great reference value for the design of aerospace products.

Bridge Deck Transverse Stress Analysis of Arch Tower Cable-Stayed Bridge with Steel Box Girder

2013 ◽  
Vol 361-363 ◽  
pp. 1240-1244
Author(s):  
Yi Shan Cao
Keyword(s):  
Finite Element ◽  
Bridge Deck ◽  
Element Model ◽  
Transverse Stress ◽  
Stay Cable ◽  
Box Girder ◽  
Finite Element Program ◽  
Steel Box Girder ◽  
Element Program ◽  
Shell Finite Element

In the engineering background of zhijang bridge, shell finite element model of steel box girder segment was established by the ABAQUS finite element program. The transverse stress of the bridge deck was analyzed by two cases of body cable and external cable, and the transverse stress of the bridge deck caused with deadweight and vehicle load was been compared. Conclusions obtained mainly include: the transverse stress of the bridge deck induced by the four cases were not large, if lateral inclination of stay cable was not particularly large, the transverse stress of the bridge deck caused by space cable can not be given special consideration.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

Finite element bending analysis of symmetric and non-symmetric functionally graded sandwich beams using a novel parabolic shear deformation theory

2021 ◽  
pp. 146442072110050
Author(s):  
Mohamed-Ouejdi Belarbi ◽  
Abdelhak Khechai ◽  
Aicha Bessaim ◽  
Mohammed-Sid-Ahmed Houari ◽  
Aman Garg ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Shear Deformation ◽  
Transverse Shear ◽  
Deformation Theory ◽  
Shear Deformation Theory ◽  
Element Model ◽  
Beam Element ◽  
Functionally Graded ◽  
Sandwich Beams

In this paper, the bending behavior of functionally graded single-layered, symmetric and non-symmetric sandwich beams is investigated according to a new higher order shear deformation theory. Based on this theory, a novel parabolic shear deformation function is developed and applied to investigate the bending response of sandwich beams with homogeneous hardcore and softcore. The present theory provides an accurate parabolic distribution of transverse shear stress across the thickness and satisfies the zero traction boundary conditions on the top and bottom surfaces of the functionally graded sandwich beam without using any shear correction factors. The governing equations derived herein are solved by employing the finite element method using a two-node beam element, developed for this purpose. The material properties of functionally graded sandwich beams are graded through the thickness according to the power-law distribution. The predictive capability of the proposed finite element model is demonstrated through illustrative examples. Four types of beam support, i.e. simply-simply, clamped-free, clamped–clamped, and clamped-simply, are used to study how the beam deflection and both axial and transverse shear stresses are affected by the variation of volume fraction index and beam length-to-height ratio. Results of the numerical analysis have been reported and compared with those available in the open literature to evaluate the accuracy and robustness of the proposed finite element model. The comparisons with other higher order shear deformation theories verify that the proposed beam element is accurate, presents fast rate of convergence to the reference results and it is also valid for both thin and thick functionally graded sandwich beams. Further, some new results are reported in the current study, which will serve as a benchmark for future research.

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