The mechanical analysis of a long-span multiple bar steel tower on temperature loads

2014 ◽  
pp. 39-46
Keyword(s):  
Mechanical Analysis ◽  
Long Span ◽  
Temperature Loads

Model Test and Structural Behavior Analysis for Cable-Pylon Anchorage Zone of Cable-Stayed Bridge

2011 ◽  
Vol 368-373 ◽  
pp. 495-500
Author(s):  
Chang Yu Fang ◽  
Yao Ting Zhang
Keyword(s):  
Finite Element ◽  
Model Test ◽  
Mechanical Analysis ◽  
Guizhou Province ◽  
Scale Model ◽  
Concentrated Force ◽  
Element Analysis ◽  
Long Span ◽  
Sensor Arrangement ◽  
Cable Force

In long-span cable-stay bridges, anchorage zone of cable-pylon is a key part to transfer cable force to pylon. Because of local concentrated force, irregular pylon section and complicated construction measures, a general mechanical analysis is unable to reflect actual stress distribution and working performance of anchorage zone. Based on Maling River Bridge in Guizhou province, China, clear finite element analysis and reliable full-scale model test for cable-pylon anchorage zone segment were carried out. Not only were design of model test and loading program introduced, but also test content and sensor arrangement were documented. In addition, details of finite element modeling were involved too, such as mesh generation, boundary condition and loading cases. Through comparison and analysis of stress increment and crack observation, the location where larger local tensile stress occurred was obtained. Corresponding anti-cracking load coefficient and safety coefficient of crack width were also presented. Parts of research findings have been used for the guidance of bridge construction.

Mechanical Analysis for the Deck Pavement of Long-Span Steel Bridge

2011 ◽  
Vol 378-379 ◽  
pp. 302-305
Author(s):  
Chun Ying Wu ◽  
Zhi Xiang Zhang
Keyword(s):  
Shear Failure ◽  
Mechanical Analysis ◽  
Influential Factors ◽  
Steel Bridge ◽  
Heavy Load ◽  
Box Girder ◽  
Long Span ◽  
Steel Box Girder ◽  
Girder Bridge ◽  
Steel Box Girder Bridge

The mechanical analysis is applied for the steel box girder bridge with orthotropic plate and pavement by means of Finite Element Method. The interaction between steel bridge and pavement on the long-span steel bridge is evaluated in three calculation stages. The emphasis of the analysis includes the mechanical characteristics and the influential factors of large components(cross diaphragm)and local components (U-shaped ribs). Considering the mechanical changes by the load of heavy-duty vehicles and heavy load with braking, the interfacial shear failure is studied for the main form of damage. In view of this major form of damage, this paper puts forward the corresponding mechanical analysis of the indicators.

Mechanical Analysis of Steel Beam and Steel-Concrete Combined Section Pavement in Long-Span Hybrid Girder Bridge

2011 ◽  
Vol 320 ◽  
pp. 103-107
Author(s):  
Ke Zhong ◽  
Jing Hu ◽  
Bin Zheng
Keyword(s):  
Optimization Design ◽  
Mechanical Analysis ◽  
Model Parameters ◽  
Steel Beam ◽  
Compound System ◽  
Beam Model ◽  
Pavement Materials ◽  
Mechanical Responses ◽  
Long Span ◽  
Girder Bridge

Firstly the pavement compound system model of steel beam and steel-concrete combined section are established based on structure characteristics of long-span hybrid girder bridge, and the worst loading locations and their characteristics of two beams are obtained. Then, mechanical responses of pavement under the worst loading locations are analyzed to compare mechanical control indices and stress distribution of two beam model. parameters and suggestions are provided for formulation of standards of long-span hybrid girder bridge pavement, at the same time theoretical basis is and selecting pavement materials and pavement structural optimization design.

Application of Folded Plate Structure with Flat Truss in Long-Span Steel Roof Structure

2011 ◽  
Vol 243-249 ◽  
pp. 625-629
Author(s):  
Can Cui ◽  
Wen Bo Sun
Keyword(s):  
Stability Analysis ◽  
Seismic Performance ◽  
Dynamic Characteristics ◽  
Steel Structure ◽  
Mechanical Analysis ◽  
Plate Structure ◽  
Long Span ◽  
Roof Structure ◽  
Overall Stability ◽  
Loading Case

Folded plate structure with flat truss is applied in the roof steel structure of the natatorium in Huai’an sports center. In this paper, mechanical analysis on loading case and dynamic characteristics of the roof steel structure is accomplished. Overall stability analysis is also completed by FEM software STRAND7. Analysis results indicate the scheme is in accordance with safety and aesthetic is appropriately designed, which could figure out that bearing capacity and seismic performance of the folded plate structure are satisfactory.

Study on Performance of Kiewitt Single-Layer Spherical Reticulated Shell Structure under the Action of Fire

2014 ◽  
Vol 488-489 ◽  
pp. 102-105
Author(s):  
Zhi Xiang Yin ◽  
Jia Peng Zhao ◽  
Si Da Zhao
Keyword(s):  
Single Layer ◽  
Mechanical Analysis ◽  
Structural Deformation ◽  
Field Calculation ◽  
Ansys Software ◽  
Time Curve ◽  
Long Span ◽  
Reticulated Shell Structure ◽  
Transient Thermal ◽  
Temperature Time

Under the condition of high temperature, steel basic mechanical property index such as strength, elastic modulus falls sharply. Once there is a fire, long-span reticulated shell has serious damage. This paper, taking Kiewitt reticulated spherical shell as an example, uses ISO - 834 standard temperature - time curve to simulate fire and analyze the distribution of temperature field calculation and mechanical. Analysis by using transient thermal analysis in ANSYS software. Through ANSYS software to analog fire resistant properties of reticulated shell under the action of local fire resistant properties, it is concluded that the fire in the different parts of the structure on the structural deformation and destruction of the structure form, to a certain extent, reflects the overall structure fire resistance of spatial reticulated shell.

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

Control of Vibrations due to Moving Loads on Suspension Bridges

2006 ◽  
Vol 11 (3) ◽  
pp. 293-318 ◽  
Author(s):  
M. Zribi ◽  
N. B. Almutairi ◽  
M. Abdel-Rohman
Keyword(s):  
Bridge Deck ◽  
Suspension Bridge ◽  
Lyapunov Theory ◽  
Dynamic Responses ◽  
Suspension Bridges ◽  
Control Force ◽  
Moving Loads ◽  
Hydraulic Actuator ◽  
Long Span ◽  
Suspended Cables

The flexibility and low damping of the long span suspended cables in suspension bridges makes them prone to vibrations due to wind and moving loads which affect the dynamic responses of the suspended cables and the bridge deck. This paper investigates the control of vibrations of a suspension bridge due to a vertical load moving on the bridge deck with a constant speed. A vertical cable between the bridge deck and the suspended cables is used to install a hydraulic actuator able to generate an active control force on the bridge deck. Two control schemes are proposed to generate the control force needed to reduce the vertical vibrations in the suspended cables and in the bridge deck. The proposed controllers, whose design is based on Lyapunov theory, guarantee the asymptotic stability of the system. The MATLAB software is used to simulate the performance of the controlled system. The simulation results indicate that the proposed controllers work well. In addition, the performance of the system with the proposed controllers is compared to the performance of the system controlled with a velocity feedback controller.

Sign in / Sign up

Export Citation Format

Share Document