Dynamics Analysis of Steel-Concrete Composite Box Beams

2014 ◽  
Vol 528 ◽  
pp. 94-100
Author(s):  
Li Zhong Jiang ◽  
Xin Kang ◽  
Chang Qing Li
Keyword(s):  
Dynamic Performance ◽  
Composite Beams ◽  
Design Stage ◽  
Finite Element Program ◽  
Long Span ◽  
Box Beam ◽  
Long Span Bridge ◽  
Element Program ◽  
Box Beams ◽  
Composite Box Beam

Steel-concrete composite box beams have been widely used in high rise buildings and long-span bridge structures. But so far, almost all researches have been aimed at the static behavior of the composite beams and dynamic behavior of steel and concrete composite beams have been rarely studied. In this paper, by using general finite element program ANSYS to analyze the dynamic performance of the composite box beam under different geometric parameters. Research is focused on the slip stiffness、width-to-thickness ratio、depth-span ratio and the height ratio of cross section to the vibration characteristics of composite box beam. The results indicate that these factors affect the seismic dynamic response of steel-concrete composite box beams most and they should be controlled according to different situations in seismic design stage.

Geometric Nonlinearity Analysis of Composite Laminated Box Beam

2010 ◽  
Vol 168-170 ◽  
pp. 1999-2002
Author(s):  
Qiang Su ◽  
Ya Ping Wu
Keyword(s):  
Shear Deformation ◽  
Geometric Nonlinearity ◽  
Shear Lag ◽  
Finite Element Program ◽  
Box Beam ◽  
Analysis Theory ◽  
Element Program ◽  
Box Beams ◽  
Minimum Potential ◽  
Equivalent Nodal Forces

In this paper, the differential equations of composite laminated box beams are established based on the principle of minimum potential energy and the variational method. Considering shear lag and shear deformation effects, elastic stiff matrix, geometric nonlinearity stiff matrix and equivalent nodal forces vector of composite laminated box beam element are given. And a finite element program is developed, then a new computing analysis theory for composite laminated box beam is given, both considering shear lag, shear deformation and geometric nonlinearity effects.

Influence of Compression-Flexure to Shear Lag Effect of Box Beam

2011 ◽  
Vol 181-182 ◽  
pp. 857-860 ◽  
Author(s):  
Qiang Su ◽  
Ya Ping Wu
Keyword(s):  
Stiffness Matrix ◽  
Elastic Stiffness ◽  
Shear Lag ◽  
Shear Lag Effect ◽  
Finite Element Program ◽  
Box Beam ◽  
Lag Effect ◽  
Element Program ◽  
Box Beams ◽  
Minimum Potential

In this paper, the differential equations of box beams are established based on the principle of minimum potential energy and the variational method. The elastic stiffness matrix and geometric stiffness matrix considering shear lag and compression-flexure effects are induced in this paper. And a finite element program is developed. Then the influence of compression-flexure effects to shear lag effect of box beam is analyzed.

Experimental Research on Bending-Torsion Characteristics of Steel-Concrete Composite Box Beams

2012 ◽  
Vol 594-597 ◽  
pp. 785-790
Author(s):  
Yan Ling Zhang ◽  
Wei Ge ◽  
De Ying Zhang
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Concrete Slab ◽  
Great Influence ◽  
Composite Beams ◽  
Ultimate Bearing Capacity ◽  
Design Parameters ◽  
Box Beam ◽  
Box Beams ◽  
Composite Box Beam

Due to the axial curvature and the eccentric vehicle loads, bending-torsion couple effects will be generated in the curved steel-concrete composite box beam bridges. To study the bending-torsion couple characteristics, six steel-concrete composite box model beams are tested under the bending-torsion couple loads, with the initial torsion-bending ratios and shear connection degrees as the design parameters. The ultimate bearing capacity, section strain, and interfacial slip of the steel-concrete composite box beams are measured. The test results show that, the fully connected composite beams mainly express bending or bending-torsion failure modes, but the partially connected composite beams are mainly sliding failure modes. The existence of the torque doesn’t have great influence on the ultimate bearing capacity and bending moment of the composite box beams. Under the bending-torsion couple loads, there are not only the longitudinal slip between the steel girder and concrete slab of the composite box beam, but also the transverse slip perpendicular to the beam axis.

The Alignment Control of Large-Span Continuous Beam Bridge Cantilever Construction Method

2013 ◽  
Vol 351-352 ◽  
pp. 1226-1230
Author(s):  
Xiao Tao Peng ◽  
Yi Xiong ◽  
Yong Wu ◽  
Dan Meng
Keyword(s):  
Variable Cross Section ◽  
Variable Cross ◽  
Design Standards ◽  
Finite Element Program ◽  
Long Span ◽  
Continuous Beam Bridge ◽  
Long Span Bridge ◽  
Element Program ◽  
Construction Loads ◽  
Cantilever Construction

One long-span bridge adopted the cantilever casting method, which is pre-stressed concrete variable cross-section continuous box girder structure. In the construction process, due to the concrete pouring, hanging basket moving, construction loads, pre-stressed tension, concrete shrinkage and creep, temperature, humidity and many other factors. There will be such problems of cantilever beam segment closed error and the bridge line-type do not coincide in design goals. In this paper, we use the bridge dedicated finite element program MIDAS / Civil procedural for modeling and structural analysis. Analyze the problems of deflection control and pre-camber adjustment of cantilever construction, in order to ensure that the bridge closure smoothly in accordance with the design standards.

Numerical Optimization of Rotor-Bearing Systems

1989 ◽  
Author(s):  
J. P. Sadler ◽  
K. E. Rouch ◽  
A. S. Rani
Keyword(s):  
Numerical Optimization ◽  
Dynamic Performance ◽  
Optimal Designs ◽  
Design Parameters ◽  
Finite Element Program ◽  
Optimum Placement ◽  
Rotor Bearing ◽  
Element Program ◽  
Programming Techniques ◽  
Selection Of

Abstract Nonlinear programming techniques are combined with a finite element program for dynamic analysis of rotor-bearing systems. The resulting program provides the means for obtaining optimal designs for improved dynamic performance of a rotor through the automated selection of various design parameters of the rotor-bearing system. Both constrained and unconstrained optimizations are considered. Illustrative examples are presented for the case of optimum placement of critical speeds.

Design on Dynamic Performance of Highway Bridges to Moving Vehicular Loads

2013 ◽  
Vol 574 ◽  
pp. 43-51 ◽  
Author(s):  
Qing Fei Gao ◽  
Zong Lin Wang ◽  
Bin Qiang Guo ◽  
Hao Ran Bu ◽  
Wei Xiong
Keyword(s):  
Finite Element ◽  
Dynamic Performance ◽  
Highway Bridges ◽  
Design Codes ◽  
Dynamic Impact ◽  
Finite Element Program ◽  
Moving Vehicles ◽  
Element Program ◽  
Deflection Limit ◽  
Dynamic Impact Factor

Based on the survey of existing highway bridges, there are a large number of flaws induced by moving vehicles. The most important cause of this phenomenon is the lack of design codes on dynamic performance of highway bridges to moving vehicular loads. The existing theory of vehicle-bridge interaction is reviewed. Then the home-code program VBCVA combined with finite element program ANSYS is introduced to analyze the problem of vehicle-bridge interaction. Also, the existing design indexes of dynamic performance are discussed, such as dynamic impact factor, deflection limit, and acceleration. On the basis of above theory and program, the framework of design on dynamic performance of highway bridges to moving vehicular loads is proposed.

Analysis of Pylon Anchorage Zone of Cable-Stayed Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1125-1128
Author(s):  
Liang Liang Zhai
Keyword(s):  
Type Structure ◽  
Construction Technology ◽  
Analysis Method ◽  
Finite Element Program ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Element Program ◽  
Force Characteristics ◽  
Major General ◽  
Cable Stayed Bridges

For long-span cable-stayed bridge, the stress of pylon anchorage zone is complex. For the construction technology personnel, the research on the force characteristics of anchorage zone can offer a theoretical base to organize construction better. This paper makes a further study for the stress of tower anchorage zone of two cable-stayed bridges with different anchor forms by using major general finite element program ANSYS to analysis the force characteristics of anchorage zone in detail. The results provide a reference for construct and design the same type structure. The analysis method for same type structure is also worth learning.

Study on Construction of Long Span and Soft Rock Tunnel with Numerical Simulation

2013 ◽  
Vol 438-439 ◽  
pp. 964-967
Author(s):  
Bin Zhu ◽  
Xiao Jing Shi
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Soft Rock ◽  
Tunnel Excavation ◽  
Finite Element Program ◽  
Factors Affecting ◽  
Long Span ◽  
Element Program ◽  
Main Factors ◽  
Rock Tunnel

With characteristics of the long span and soft rock tunnel, this paper analyzes the main factors affecting tunnel stable on the basis of the way of tunnel excavation method. The large finite element program is used in research of a tunnel, with a numerical simulation of two different way, top heading and bench method and double side drift method. From the result of stress field and displacement field of the tunnel , some useful conclusion are obtained, that double side drift method is appropriate for this kind of soft rock tunnel.

Nonlinear FEM and Control Method for Super-Long Span Three Main Trusses and Three Cable Planes Railway Cable-Stayed Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 1065-1069
Author(s):  
Zhi Shuo Yang ◽  
Mei Xin Ye ◽  
Yan Qun Zhou ◽  
Li Ou
Keyword(s):  
Control Method ◽  
Geometrical Nonlinearity ◽  
Secondary Development ◽  
Fe Model ◽  
Changjiang River ◽  
Nonlinear Fem ◽  
Finite Element Program ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Element Program

The Anqing Changjiang River Railway Bridge is an important fixed link across the Changjiang River in Anqing both the Nanjing-Anqing Intercity Railway and Fuyang-Jingdezhen Railway. Its main bridge is a six-span continuous steel truss girder cable-stayed bridge with main span of 580 m. The purpose of this paper is to describe some of its main features and FE model for geometrical nonlinearity using the finite element program ANSYS as well as control method of stress-free status for erection of cable-stayed bridge. Based on geometrical nonlinear analysis theories, secondary development of ANSYS using APDL was accomplished.

Parametric Study on Simulation Modeling of Diameter-Expanded Conductor

2013 ◽  
Vol 815 ◽  
pp. 69-72
Author(s):  
Jia Jun Si ◽  
Kuan Jun Zhu ◽  
Jian Cheng Wan ◽  
Jia Lun Yang ◽  
Long Liu ◽  
...  
Keyword(s):  
Finite Element ◽  
Parametric Study ◽  
Simulation Modeling ◽  
Test Method ◽  
Design Stage ◽  
Finite Element Program ◽  
Instability Problem ◽  
Element Simulation ◽  
Element Program ◽  
The Cost

So as to decrease the cost and time of the development, it is significance to solve the section instability problem of diameter-expanded conductor during the design stage. The solution is developing a finite-element simulation program for the study of section stability; however, a proper modeling method is not necessary. In this paper, the parametric study on simulation modeling of diameter-expanded conductor is carried out and through the investigation, analysis and verification; a kind of test method has been designed for the study. After a series of test under different tensions, the numbers of sheave, the position of strand jumping, the section states and the indentation states have been gotten. At last, a parametric finite-element program for strand jumping prediction has been simulated and the result shows that the code developed is reliable based on the comparison of the calculated results and the measured ones.

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