scholarly journals Analysis of Temperature and Humidity Distribution and Corrosion Effect on Suspender of Arch Bridge

2021 ◽  
Author(s):  
Shiqiao Xu
Keyword(s):  
Cross Section ◽  
Coupling Effect ◽  
Steel Wire ◽  
Operation Time ◽  
Element Model ◽  
Arch Bridge ◽  
Temperature And Humidity ◽  
The Cross ◽  
Numerical Finite Element ◽  
Arch Bridges

With the continuous improvement of bridge span, high-strength steel wire suspenders are more and more widely used in arch bridges. Because metals are thermodynamically unstable, most metals will corrode at a different speed. Especially with the increase of bridge operation time, the suspender steel wire will be corroded under the coupling effect of external environment and internal temperature and humidity. By taking Wanganshi Fuhe Bridge as the engineering example, this study established a numerical finite element model to simulate the variation of temperature in the cross section of the suspender. Then, the distribution of humidity in the cross section in the suspender under the influence of temperature can be obtained. Finally, the corrosion rate of the suspender and the residual diameter after corrosion at different operating years were calculated. Based on the analysis results, the performance of the suspender is divided into different grades which can be used to guide the maintenance and replacement of the suspender of the arch bridge by the bridge maintenance and management department.

scholarly journals Study of the effect of the application of the double finish drawing die on the plastic properties of steel high carbon wire

2019 ◽  
pp. 112-117
Author(s):  
V. A. Evdonich ◽  
Yu. L. Bobarikin ◽  
Yu. V. Martianov ◽  
T. A. Akhmetov
Keyword(s):  
Cross Section ◽  
Experimental Tests ◽  
Element Model ◽  
Wire Drawing ◽  
Plastic Properties ◽  
Effective Stresses ◽  
Drawing Die ◽  
The Wire ◽  
The Cross ◽  
Numerical Finite Element

The possibility of application of the double finishing drawing die at the stage of fine-drawing in the manufacture of steel metal cord 2x0 30SHT is сontemplated. As a result of the performed studies, a numerical finite element model of wire drawing in a serial finishing single fiber and in an experimental double finishing fiber has been developed. The obtained distribution of effective plastic deformation in the wire during drawing shows that when drawing in a double fiber, there is a higher uniformity of deformation in the direction of the radius of the wire along the cross section located at the outlet of the die. The distribution of effective stresses in the wire when drawing shows that when drawing in a double fiber, there is a more uniform distribution of effective stresses in the direction of the radius of the wire along the cross section located at the outlet of the die.Further experimental tests performed at the drawing mill NT 12.4 in StPC-1 showed that the use of double dies allowed to increase the plastic properties of the wire 0.30 SHT, manifested in technological tests by increasing the number of reversible twists of the wire from 7 to 78 and reducing the ratio of yield strength to tensile strength decreased from 95 to 91.

Study of Reinforcing Mechanism of Rigid-Frame Arch Bridge Based on Static and Dynamic Analysis

2011 ◽  
Vol 219-220 ◽  
pp. 458-462
Author(s):  
Ze Ying Yang ◽  
Xi Bin Zhang ◽  
Jian Bo Qu
Keyword(s):  
Dynamic Properties ◽  
Element Model ◽  
Reinforcement Scheme ◽  
Arch Bridge ◽  
3 Dimensional ◽  
Static And Dynamic Analysis ◽  
Rigid Frame ◽  
Dimensional Finite Element ◽  
Arch Bridges ◽  
The Relationship

According to Dawenkou bridge, a seriously deteriorated rigid-frame arch bridge, typical deteriorations of rigid-frame arch bridges were summarized. Based on 3-dimensional finite element model of a rigid-frame arch bridge, the relationship between dynamic properties and deteriorations of the structure, especially the influence of lateral tie system on the dynamic properties of the structure was analyzed. The results show that, damages of lateral tie system in operation induced premature appearance of lateral vibration directly; however, the large curvature torsion of deck obviously should take the mainly responsibility of damages of lateral tie system. According to the above analysis, the corresponding reinforcement scheme and specific measures were proposed.

scholarly journals Fatigue Performance Assessment of Composite Arch Bridge Suspenders Based on Actual Vehicle Loads

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Bin Chen ◽  
Xiaozhang Li ◽  
Xu Xie ◽  
Zheng Zhong ◽  
Pengzhen Lu
Keyword(s):  
Amplitude Spectrum ◽  
Element Model ◽  
Bridge Engineering ◽  
Fatigue Performance ◽  
Stress Process ◽  
Arch Bridge ◽  
Vehicle Data ◽  
Gross Vehicle Weight ◽  
Cable Force ◽  
Arch Bridges

In the through arch bridges, the suspenders are the key components connecting the arch rib and the bridge deck in the middle, and their safety is an increasing focus in the field of bridge engineering. In this study, various vehicle traffic flow parameters are investigated based on the actual vehicle data acquired from the long-term structural health monitoring system of a composite arch bridge. The representative vehicle types and the probability density functions of several parameters are determined, including the gross vehicle weight, axle weight, time headway, and speed. A finite element model of the bridge structure is constructed to determine the influence line of the cable force for various suspenders. A simulated vehicle flow, generated using the Monte Carlo method, is applied on the influence lines of the target suspender to determine the stress process, and then the stress amplitude spectrum is obtained based on the statistical analysis of the stress process using the rainflow counting method. The fatigue performance levels of various suspenders are analyzed according to the Palmgren-Miner linear cumulative damage theory, which helps to manage the safety of the suspenders.

Feasibility of using self-compacting concrete in civil engineering applications

2017 ◽  
Vol 8 (3) ◽  
pp. 70
Author(s):  
Zeinab A. Etman ◽  
Mounir M. Kamal ◽  
Mohamed R. Afify ◽  
Tamer I. Ahmaed
Keyword(s):  
Cross Section ◽  
Civil Engineering ◽  
Steel Wire ◽  
Element Model ◽  
Concrete Cover ◽  
Wire Mesh ◽  
Self Compacting Concrete ◽  
Engineering Applications ◽  
Line Load ◽  
Wire Meshes

This research aimed to investigate the feasibility of using self-compacting concrete in civil engineering applications as a producing a precast hollow unit. The behavior of the hollow sections cast with self-compacted concrete beneath line-load was evaluated. An experimental work was carried out and a finite element model with ANSYS (version 15) was adopted. A total of fourteen hollow beams were cast and tested. The most variables taken into thought were; the types of reinforcement (reinforced steel bar and steel wire meshes), the types of steel wire meshes (expanded and welded steel wire mesh), number of layers of steel meshes (one layer and two layers), cross section thickness of concrete (40 mm and 60mm), concrete cover thickness (15mm and 20 mm) and also the shapes of cross section (square or circular). Special attention to initial cracking load, ultimate load, deflection, cracking pattern, energy absorption and ductility index were investigated. Good agreement was found compared with the experimental results. Out of this research; this paper presents applications of self-compacted concrete for casting skinny structural hollow members. These members can be used as precast units within the construction of the tunnel to decrease the problems in highway roads due to the difficulty of using crossing bridges particularly for kids and old people which are very useful for developing countries with great economic advantages.

Transmission Loss of Variable Cross Section Apertures

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
J. Li ◽  
L. Zhou ◽  
X. Hua ◽  
D. W. Herrin
Keyword(s):  
Finite Element ◽  
Cross Section ◽  
Sound Propagation ◽  
Transmission Loss ◽  
Element Model ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Cross Sectional ◽  
Radiation Impedance ◽  
The Cross

Openings in enclosures or walls are frequently the dominant path for sound propagation. In the current work, a transfer matrix method is used to predict the transmission loss of apertures assuming that the cross-sectional dimensions are small compared with an acoustic wavelength. Results are compared with good agreement to an acoustic finite element approach in which the loading on the source side of the finite element model (FEM) is a diffuse acoustic field applied by determining the cross-spectral force matrix of the excitation. The radiation impedance for both the source and termination is determined using a wavelet algorithm. Both approaches can be applied to leaks of any shape and special consideration is given to apertures with varying cross section. Specifically, cones and abrupt area changes are considered, and it is shown that the transmission loss can be increased by greater than 10 dB at many frequencies.

Effect of Temperature on Geometric Accuracy of AZ31 Profile during Warm Pre-Tension Rotation Bending

2011 ◽  
Vol 299-300 ◽  
pp. 432-435
Author(s):  
Han Xiao ◽  
Shi Hong Zhang ◽  
Jin Song Liu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Cross Section ◽  
Element Model ◽  
Effect Of Temperature ◽  
Geometric Accuracy ◽  
Elastic Plastic ◽  
Bending Process ◽  
Forming Temperature ◽  
The Cross

A warm pre-tension rotation bending process is presented to bend the AZ31 profile. A 3D elastic-plastic thermo-mechanical coupled finite element model is established to investigate the effect of forming temperature on the geometric accuracy of the profile. The results indicate that with increasing forming temperature, the springback angles decrease from 8.37° to 7.2°; the bending radii decrease from 90.69 mm to 89.67 mm; the cross-section distortion of the bent profile increases.

An Investigation into the Earthquake Reaponses of Special-Shaped Arch Bridges

2011 ◽  
Vol 117-119 ◽  
pp. 328-331
Author(s):  
Chang Huan Kou ◽  
Ming Chang Yang ◽  
Shih Wei Ma ◽  
Tsung Ta Wu
Keyword(s):  
Stress Responses ◽  
Response Spectrum ◽  
Element Model ◽  
Geometric Shape ◽  
Arch Bridge ◽  
Out Of Plane ◽  
Internal Forces ◽  
Arch Bridges ◽  
Cable Forces ◽  
Vertical Deformations

By building a finite element model of a special-shaped arch bridge, this paper discusses the effects of the changes of the geometric shape, and the skewed angle of the girder and arch on the dynamic characteristics. In addition, this paper analyzes the longitudinal earthquake responses using the response spectrum method. The results show that when longitudinal earthquakes occur, all geometric shapes, and skewed angles of the girder and arch exhibit different levels of effect on the horizontal and vertical deformations of the girder and the arch, the internal forces of the arch, the girder, and the cables. Among all these parts of the bridge, the arch is affected most by the aforementioned factors. Moreover, because of the unique geometric shape of the special-shaped arch bridge, the distributions of initial and completed cable forces are complex. Therefore, obtaining regular stress responses from the special-shaped arch bridge is difficult regardless of whether the bridge is in-plane or out-of-plane. Hence, the arrangement of cable forces should be specifically considered when building an analytic model of a special-shaped arch bridge.

scholarly journals Cross section and geometry optimization of steel truss arch bridges based on internal forces

2019 ◽  
Vol 258 ◽  
pp. 02002
Author(s):  
Malik Mushthofa ◽  
Akhmad Aminullah ◽  
Muslikh
Keyword(s):  
Cross Section ◽  
Axial Force ◽  
Geometric Design ◽  
Bridge Design ◽  
Arch Bridge ◽  
Ratio Data ◽  
Steel Truss ◽  
China And Japan ◽  
Arch Bridges ◽  
Steel Section

The purpose of this study is to obtain the optimum geometric design and cross section member element of steel arch bridges. It is necessary because the geometric design of the steel truss arch bridges have the direct impact to the steel section used in the structures. Therefore, steel section have the impact to the economic value of the bridge design due to the structure weight. There are many important variables have to considered in the bridge design. Rise to span ratio variable is the major variable in the arch bridge geometric design. Arch bridge structures rely on the axial force capacity of the main arch, whereas shear forces and bending moments as secondary consideration. The optimization process is done by collecting the axial force, shear force and bending moment data of each steel arch bridge numeric model, and scaling its value from 0 to 1 to compare the data of every span in the same field, in order to achieve the optimum rise to span ratio. Rise to span ratio data of steel arch bridges in China and Japan used as the comparison with the result of this study, due to their brief history and rich experiences on arch bridge engineering innovation, and also have the large of amount of steel arch bridges. The results of this study give the optimum value of rise to span ratio between 1/4 to 1/7. It has good correlation with the rise to span ratio data of steel arch bridges in China and Japan i.e. 1/4 - 1/6 and 1/5 - 1/7 respectively.

scholarly journals Dynamic Response Analysis of Half-through CFST Arch Bridges Affected by Crossbeams Setting

2012 ◽  
Vol 5 ◽  
pp. 201-206
Author(s):  
Jun Ma ◽  
Yan Li
Keyword(s):  
Dynamic Response ◽  
Bridge Deck ◽  
Internal Force ◽  
Operating Conditions ◽  
Response Analysis ◽  
Transverse Displacement ◽  
Arch Bridge ◽  
The Cross ◽  
Arch Bridges ◽  
Joint Section

As one of the most important components of CFST arch bridges, the cross beams should affect the bridges’ dynamic performance and response magnificently by means of affecting these three factors mentioned above. Based on the Maocaojie Bridge, its FEM models of half-through CFST arch bridges with different settings of cross beams are built. The different seismic responses of six operating conditions are calculated with three dimensional earthquake waves input. The internal force and displacement envelope diagrams of arch ribs are extracted and analyzed in situations of in-plane moment, out-plane moment, vertical displacement and transverse displacement. It can conclude that the joint section between arch rib and bridge deck should be designed carefully because of its large displacement and internal force, and the cross beams should be optimized to safety the arch bridge dynamic response considering lateral rigidity. The conclusions may be useful to the seismic design and strengthening treatment of CFST arch bridges. To strengthen the joint section between arch rib and bridge deck or optimize the setting of cross beams will increase the ductility of half-through CFST arch bridge and decrease the damages caused by large earthquake.

Sign in / Sign up

Export Citation Format

Share Document