The Incremental Launching Construction Technology of Pontoon Pivot Conversion of Large-span Steel Arch Bridge

2020 ◽  
Vol 63 (1) ◽  
pp. 46-52
Author(s):  
Jin Wang
Keyword(s):  
Building Materials ◽  
Maximum Stress ◽  
Element Model ◽  
Construction Technology ◽  
Construction Process ◽  
Deformation Degree ◽  
Arch Bridge ◽  
Large Span ◽  
Stress And Deformation ◽  
Instance Analysis

Abstract With the progress of building materials and building technology, the span of bridges is becoming larger and larger. This paper briefly introduces the incremental launching construction technology of a bridge and the incremental launching construction technology of pontoon fulcrum conversion, makes an instance analysis on a large-span steel arch bridge that adopted the incremental launching technology of pontoon fulcrum conversion in Shaoyang, Hunan, China, and makes a simulation calculation on the construction process using Midas civil software. The construction process was monitored using stress sensors and total station. The results showed that the simulation results of the stress and deformation changes of the steel arch bridge in the construction process were close to the actual monitoring data, and the variation trend was basically the same. The finite element model effectively simulated the stress and deformation changes of the steel arch bridge in incremental launching. With the progress of construction conditions, the maximum stress and deformation degree of the arch rib increased first and then decreased, the maximum stress and deformation degree of the main longitudinal beam showed an increase tendency, the maximum stress of the front guide beam increased first and then decreased, and the deformation degree gradually decreased.

Mechanics Study on the Leaning-Type Arch Bridge during the Construction Process Based on Building Materials

2013 ◽  
Vol 676 ◽  
pp. 166-169
Author(s):  
Xin Cheng Zeng ◽  
Ai Rong Liu ◽  
Xin Sheng Zhao ◽  
Jiang Dong Deng
Keyword(s):  
Building Materials ◽  
Construction Process ◽  
Mechanical Behaviors ◽  
Arch Bridge ◽  
Measured Stress ◽  
Reasonable Range ◽  
Design Requirements ◽  
Stress And Deformation ◽  
Main Arch ◽  
Arch Construction

With the constructing project of Shengli Bridge as the background, this paper presents the measured stress and deformation data of main arch rib during the process of full framing scheme. The measured data are compared with the computation results.And the mechanical behaviors of the arch bridge were studied to reveal the changing tendency of stress and displacement of the main arch construction completed to completion stage. The analysis results show that the stress and the displacement of the key structures are in a reasonable range and meet the design requirements during the process of the construction process.

Construction Monitoring Technology Research on Large-Span V Structure Tied Arch Bridge

2013 ◽  
Vol 351-352 ◽  
pp. 1240-1243 ◽  
Author(s):  
Ting Yin ◽  
Wei Zhang ◽  
Yan Bo Zhao ◽  
Xiao Long Sun
Keyword(s):  
Actual State ◽  
Construction Process ◽  
Bridge Construction ◽  
Monitoring Point ◽  
Monitoring Technology ◽  
Construction Monitoring ◽  
Arch Bridge ◽  
Large Span ◽  
Long Span ◽  
Tied Arch Bridge

Large-span V structure tied arch bridge structure system is complex. In order to make the actual state of the bridge into the ideal state of maximum close to the design, we must make real-time monitoring in the key parts of the structure, and adjust to the design of the data by analysis calculated, to ensure the safety and reliability of arch bridge in the course of construction and into stress after the completed bridge. Combined with the construction monitoring of the main Xinglong Bridge on Si River, this paper introduces the main bridge construction process measurement a preliminary study on the large span V configuration basket tied arch bridge construction monitoring technology. Based on the construction monitoring of Xinglong Bridge on Si River, this paper introduces the main contents and methods of monitoring point location, monitoring control of construction process, and discussed the construction monitoring technology of long-span X-style tied arch bridge V structure.

scholarly journals Comparative Analysis of Static Loading Performance of Rigid and Flexible Road Wheel based on Finite Element Method

2020 ◽  
Vol 70 (1) ◽  
pp. 41-46
Author(s):  
Yaoji Deng ◽  
Youqun Zhao ◽  
Mingmin Zhu ◽  
Zhen Xiao ◽  
Qiuwei Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Static Loading ◽  
Maximum Stress ◽  
Three Dimensional ◽  
Element Model ◽  
Vertical Load ◽  
New Type ◽  
Stress And Deformation ◽  
Nonlinear Finite Element Model

To overcome the shortcomings of traditional rigid road wheel, such as poor damping effect and low load-bearing efficiency, a new type of flexible road wheel, having a unique suspension-bearing mode, was introduced. The three-dimensional nonlinear finite element model of rigid and flexible road wheel, considering the triple nonlinear characteristics of geometry, material and contact, is established for numerical investigation of static loading performance. The accuracy of the finite element model of the rigid and flexible road wheel is verified by static loading experiment. The static loading performance of the rigid and flexible road wheels is numerically analyzed. The influence of vertical load on maximum stress and deformation of the rigid and flexible wheels is also studied. The results show that the contact pressure uniformity of the flexible road wheel is better than that of the rigid road wheel under the static vertical load, but the maximum stress and deformation of the flexible road wheel are greater than that of the rigid road wheel. However, this problem can be solved by increasing the number of hinge sets and optimising the joints. The research results provide theoretical basis for replacing rigid road wheel with flexible road wheel, and also provide reference for structural optimisation of flexible road wheel.

Construction Technology of Large-Span Hybrid Structure of Suspendome with Stacked Arch in Chiping Gymnasium

2011 ◽  
Vol 243-249 ◽  
pp. 6083-6086 ◽  
Author(s):  
Xiao Bei Wang ◽  
Zhen Hua Liu ◽  
Ming Gong ◽  
Lian Fen Weng
Keyword(s):  
High Altitude ◽  
Steel Structure ◽  
Hybrid Structure ◽  
Construction Technology ◽  
Large Span ◽  
Finite Element Software ◽  
Roof Structure ◽  
Temporary Support ◽  
Stress And Deformation ◽  
Lattice Shell

Large-span hybrid structure of suspendome with stacked arch is applied into steel roof of Chiping Gymnasium. The construction of this new type structure system is difficult according to structure characteristics such as its large-span stacked arch, high installation altitude, lattice shell installation, prestressed cable tension, and tight construction period. Temporary support frame, segment lifting and high altitude splicing construction method is adopted to install the stacked arch, and total support, high-altitude spread operation method is used to install lattice dome. A spatial structural analysis is conducted on the supporting system, and the finite element software is adopted to simulate and analyze the installation process of the steel structure roof system. At the same time, stress and deformation of the roof structure are monitored by precise instruments and equipments. As the result, construction safety and quality are guaranteed.

Effect of welding sequence on stress and deformation field of Invar alloy multi-layer and multi-pass welding: A simulation study

2020 ◽  
Vol 34 (13) ◽  
pp. 2050129
Author(s):  
Qiyu Gao ◽  
Xiaohong Zhan ◽  
Honglie Shen ◽  
Wanli Ling ◽  
Hengchang Bu
Keyword(s):  
Maximum Stress ◽  
Element Model ◽  
Invar Alloy ◽  
Residual Tensile Stress ◽  
Welding Zone ◽  
Welding Stress ◽  
A Value ◽  
Welding Sequence ◽  
Simulation Results ◽  
Stress And Deformation

The welding sequence has an important influence on the formation of stress and deformation in multi-layer and multi-pass welding (MLMPW). In this paper, a 3D finite element model of Invar alloy welding that can calculate the welding stress and deformation has been established using MSC. Marc. The simulation results show that there is high residual tensile stress in the welding zone. For six-layer twelve-pass welding, the welding sequence has little effect on maximum stress value. Meantime, welding deformation is mainly distributed far from the weld metal area and is mainly affected by welding sequence under similar other welding conditions. It is found that the deformation angle of welding sequence D is the smallest, with a value of [Formula: see text].

Analysis of Stress in Construction Monitoring of Long - Span Concrete Bridge

2017 ◽  
Vol 1 (1) ◽  
pp. 6
Author(s):  
Jianwei Li
Keyword(s):  
Concrete Bridges ◽  
Concrete Bridge ◽  
Construction Technology ◽  
Construction Process ◽  
Stress Monitoring ◽  
Construction Monitoring ◽  
Technology Application ◽  
Large Span ◽  
Long Span

In order to improve the quality of the relevant construction development activities and effectively meet the special requirements of the design and construction of large span concrete bridges, the safety, effectiveness and economy of the bridge are fully enhanced. In this paper, the spatial structure of the long span concrete bridge is very special. As well as environmental adaptability, technical staff should be based on the development of large and span concrete bridge construction activities of the actual needs of large-span concrete bridge for scientific design and planning, but also the construction technology application activities for scientific supervision. The purpose of this paper is to explore the scientific and efficient application of stress monitoring in the construction process of large span concrete bridge under the guidance of the relevant theory of construction from the perspective of stress monitoring, so as to ensure the accuracy of construction activities and promote the development of bridge orderly development.

scholarly journals The Construction Technology of Roof Steel Structure in YanCheng NanYang Airport

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Qin Yang ◽  
Shaole Yu ◽  
Xuewei Zhang ◽  
Zhijun Wang ◽  
Junsheng Yan ◽  
...  
Keyword(s):  
Maximum Stress ◽  
Steel Structure ◽  
Construction Safety ◽  
General Situation ◽  
Construction Technology ◽  
Construction Process ◽  
Construction Monitoring ◽  
Construction Scheme ◽  
Project Characteristics ◽  
Elastic Stage

The roof steel structure in the Terminal 2 building of YanCheng NanYang Airport has a large span and a considerably difficult construction. According to the project characteristics, the construction scheme of the roof steel structure follows the principle of subareas and substeps, with the truss lifting in segmentation. To ensure construction safety, a construction monitoring scheme was adopted in this project. According to the layout of the roof steel structure, a total of 10 monitoring points are arranged to monitor the stress of the roof steel structure during the construction process. This paper first gives a brief introduction to the general situation regarding the engineering, followed by a detailed description of the construction scheme of such a roof steel structure. Then, the monitoring results, including monitoring of the main truss’ stress and column head, are introduced. The monitoring results revealed that the variation of stress in monitoring points followed the same trend as the monitoring data. The maximum stress was 166.6 MPa according to the monitoring results, which indicate that the stress of the roof steel structure is in the elastic stage during the construction process and the construction scheme is feasible.

scholarly journals Scientometric Analysis for Mechanical Performance of Broken-Line Long-Span Steel Structure in Construction Considering Geometric Nonlinearity

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1229
Author(s):  
Gang Yao ◽  
Chaoyu Wu ◽  
Yang Yang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Steel Structure ◽  
Element Model ◽  
Structural Quality ◽  
Scientometric Analysis ◽  
Construction Process ◽  
Large Span ◽  
Long Span ◽  
The Impact

A structure does not reach a stable state during the construction process, and hence its structural reliability is low. In order to ensure the safety of the construction process and final structural quality, it is necessary to analyze the safety and structural mechanical properties of large-span space steel structures during the construction process. Based on the engineering background of the polyline symmetrical large-span steel structure construction process, this research established a finite element model of the large-span steel structure on an ANSYS platform. The correctness of the model was verified by comparing the measured frequency of the large-span steel structure with the frequency calculated in the finite element model. Based on the life-death element method, the internal force and deformation response characteristics of the large-span steel structure in the construction process were analyzed, and the different effects of the on-time completion and step-by-step construction on the performance of the broken-line large-span steel structure were compared and analyzed. The study found that the long-span steel truss structure is more sensitive to the construction process, and the final forming state is greatly affected by the construction process. The construction sequence is different, and the structure process and size and distribution of the final stress and deformation are also different. The analysis result of the construction process is closer to that of the actual project. Therefore, appropriate construction paths should be used in the construction process to reduce the impact of path effects on structural performance. It is recommended to pay more attention to the displacement and stress response of the truss when it encounters similar a symmetrical long-span steel structure truss in-place of the forming construction.

Analysis of Stress in Construction Monitoring of Long - Span Concrete Bridge

2017 ◽  
Vol 1 ◽  
pp. 6
Author(s):  
Jianwei Li
Keyword(s):  
Concrete Bridges ◽  
Concrete Bridge ◽  
Construction Technology ◽  
Construction Process ◽  
Stress Monitoring ◽  
Construction Monitoring ◽  
Technology Application ◽  
Large Span ◽  
Long Span

In order to improve the quality of the relevant construction development activities and effectively meet the special requirements of the design and construction of large span concrete bridges, the safety, effectiveness and economy of the bridge are fully enhanced. In this paper, the spatial structure of the long span concrete bridge is very special. As well as environmental adaptability, technical staff should be based on the development of large and span concrete bridge construction activities of the actual needs of large-span concrete bridge for scientific design and planning, but also the construction technology application activities for scientific supervision. The purpose of this paper is to explore the scientific and efficient application of stress monitoring in the construction process of large span concrete bridge under the guidance of the relevant theory of construction from the perspective of stress monitoring, so as to ensure the accuracy of construction activities and promote the development of bridge orderly development.

Multi-Condition Analysis and Optimization of Sprayer Frame

2016 ◽  
Vol 835 ◽  
pp. 632-638
Author(s):  
Zhi Hong Wang ◽  
Jin Biao Wu ◽  
Jia Wu Liu
Keyword(s):  
Finite Element ◽  
Constant Velocity ◽  
3D Model ◽  
Maximum Stress ◽  
Element Model ◽  
Element Analysis ◽  
Frame Design ◽  
Emergency Braking ◽  
Stress And Deformation ◽  
Distribution Of Stress

A high clearance self-propelled sprayer was designed, and a 3D model of sprayer frame was built with CATIA. Its finite element model was built by using Hypermesh, and it was imported to ABAQUS for finite element analysis. The analysis researched the stress and deformation of frame under four typical conditions of constant-velocity, torsion, emergency braking and emergency turning. The weak region of strength in the variable track mechanism was found, and a size optimization research was carried to the square pipe of the variable track mechanism. The result showed that the maximum stress of frame after optimization decreased obviously, and the distribution of stress became much more reasonable. The optimization ensured the reliability of the frame design.

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