Research on Deformation Monitoring of Large Span Hyperbolic-Paraboloid Composite Torsional Shell

2010 ◽  
Vol 163-167 ◽  
pp. 2819-2823
Author(s):  
Hui Deng ◽  
Guang Jian Xiao ◽  
Yu Cao
Keyword(s):  
Deformation Monitoring ◽  
Type Structure ◽  
Hyperbolic Paraboloid ◽  
Construction Monitoring ◽  
Large Span ◽  
Long Span ◽  
Deformation Parameters ◽  
New Type ◽  
Measured Deformation ◽  
Construction Optimization

Long span hyperbolic-paraboloid composite torsional shell is a new type structure. In order to find out actual deformation of the roof during construction, monitoring is carried out based on deformation monitoring scheme that was put forward in this paper, and deformation parameters and characteristic of the roof are obtained. It is proved that the measured deformation values are basically consistent with the simulation calculations, and the results show that the scheme is correct and feasible, meanwhile, all of monitoring results are helpful for future analog calculation, design and construction optimization of similar project.

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.

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.

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.

scholarly journals Current and New Approaches to Predict the Deflections of One-Way Flexural Members with a Focus on Composite Steel Deck Slabs Voided by Circular Tubes

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 421
Author(s):  
Chang-Hwan Lee ◽  
Iman Mansouri ◽  
Jaehoon Bae ◽  
Jaeho Ryu
Keyword(s):  
Structural Function ◽  
Flexural Members ◽  
Long Span ◽  
Deck Slabs ◽  
New Type ◽  
New Perspective ◽  
Flexural Tests ◽  
Prediction Approach ◽  
Steel Deck

A new type of composite voided slab, the TUBEDECK (TD), which utilizes the structural function of profiled steel decks, has recently been proposed. Previous studies have confirmed that the flexural strength of TD slabs can be calculated based on the full composite contribution of the steel deck, but for long-span flexural members, the deflection serviceability requirement is often dominant. Herein, we derived a novel deflection prediction approach using the results of flexural tests on slab specimens, focusing on TD slabs. First, deflection prediction based on modifications of the current code was proposed. Results revealed that TD slabs exhibited smaller long-term deflections and at least 10% longer maximum span lengths than solid slabs, indicating their greater efficiency. Second, a novel rational method was derived for predicting deflections without computing the effective moment of inertia. The ultimate deflections predicted by the proposed method correlated closely with the deflection under maximum bending moments. To calculate immediate deflections, variation functions for the concrete strain at the extreme compression fiber and neutral axis depth were assumed with predictions in good agreement with experiments. The proposed procedure has important implications in highlighting a new perspective on the deflection prediction of reinforced concrete and composite flexural members.

Sublimation of composite ice and its influence on performance of ice shells

2021 ◽  
Vol 36 (1) ◽  
pp. 67-77
Author(s):  
Yue Wu ◽  
Junkai Huang ◽  
Jiafeng Chen
Keyword(s):  
Numerical Simulation ◽  
Shell Structure ◽  
Composite Shell ◽  
Engineering Practice ◽  
Sublimation Rate ◽  
Long Span ◽  
Static Performance ◽  
New Type ◽  
Ice Sublimation ◽  
Composite Shell Structure

The long-span ice composite shell structure is a new type of ice and snow structure developed in recent years. The engineering practice of ice composite shell shows that sublimation is one of the important reasons for its damage and even collapse. In this paper, we firstly supplemented the existing H-K equation and obtained the revised ice sublimation equation through indoor evaporative plate experiment considering the influence of admixtures and wind speed. Afterwards, combining the simulations of solar radiation and CFD, the numerical simulation of sublimation distribution on the surface of were realized by programming in Grasshopper platform. During sublimation, the thickness of the ice composite shell decreases by 0.38 mm every 10 days and the sublimation rate on the sunny side was 1.7 times that on the shady side. Finally, the static performance and stability of the sublimated ice composite spherical shell were analyzed. After 70 days of sublimation, the thickness of the ice composite shell structure becomes thinner and uneven, which leads its sensitivity to external load increases.

A New Class of Oxide Superconductor (Nd, Ce, Sr)2CuO4

1989 ◽  
Vol 156 ◽  
Author(s):  
E. Takayama-Muromachi
Keyword(s):  
Crystal Structure ◽  
Crystal Chemistry ◽  
Superconducting Phase ◽  
Type Structure ◽  
Oxide Superconductor ◽  
New Class ◽  
System 2 ◽  
New Type ◽  
System 1 ◽  
Tetragonal Cell

ABSTRACTSince the discovery of the high-Tc superconductor in the La-Ba-Cu-O system [1], a great deal of experimental and theoretical effort have been made to clarify the nature of the Cu-based oxides. In order to elucidate mechanism of the high-Tc superconductivity, discovery of a new type of superconductor is no doubt of great importance. Recently, Akimitsu et al. found a new oxide superconductor in the Nd-Ce-Sr-Cu-O system [2]. Soon after their discovery, the superconducting phase was isolated and identified [3]. It has a tetragonal cell with space group P4/nmm and has a structure closely related to but different from the K2NiF4− or T'-Nd2CuO4− -type structure. Although, Tc of the Nd-Ce-Sr-Cu oxide is not so high (ca. 20 K) compared with the 1–2–3 or Bi(Tl)-based superconductors, it has aroused interest widely due to a very simple crystal structure. In this article, I will discuss superconductivity and crystal chemistry of the Nd-Ce-Sr-Cu oxide. Also, various compounds isostructural to it will be presented.

scholarly journals Research on Construction Monitoring of Large-Span Steel Pipe Truss Structure

2019 ◽  
Vol 09 (04) ◽  
pp. 255-267
Author(s):  
Kongliang Chen ◽  
Guoqing Yuan ◽  
Liankun Wang ◽  
Wenzhi Zhang ◽  
Xiaoke Wang
Keyword(s):  
Truss Structure ◽  
Steel Pipe ◽  
Construction Monitoring ◽  
Large Span

Structural Innovation and Form Expression for New-Type Large-Span Timber Building

2011 ◽  
Vol 374-377 ◽  
pp. 2066-2070
Author(s):  
Zhao Xia Wang ◽  
De Xin Zong
Keyword(s):  
Space Form ◽  
Main Body ◽  
Construction Technology ◽  
Form Expression ◽  
Modern Material ◽  
Large Span ◽  
Glued Laminated Timber ◽  
New Type ◽  
Technical Features ◽  
Structural Innovation

Promoted by modern material and construction technology, various ingenious structural forms are created with wide use of glued-laminated timber in large-span building. On the analysis of some classical cases for large-span timber structure, this paper expounds the design thoughts and technical features of employing structure as the main body of building space form and presents the idea of integrating large-span timber structural innovation with the spatial forms.

Analysis of Sensitive Factors of Long-Span Continuous Rigid Frame Bridge’s Stability with Thin-Wall Piers in the Construction Stage

2011 ◽  
Vol 255-260 ◽  
pp. 921-925 ◽  
Author(s):  
Hai Jun Wu ◽  
Yu Qiang Kang ◽  
Lei Zhang
Keyword(s):  
Prestressed Concrete ◽  
Wind Load ◽  
Basic Theory ◽  
Thin Wall ◽  
Large Span ◽  
Long Span ◽  
Rigid Frame ◽  
Main Factors ◽  
High Pier ◽  
The Stability

Analyzing the basic theory of stability, with a high pier of large span prestressed concrete continuous bridge as the example, the stability was analyzed when constructing, considering wind load, hanging basket, pier etc. Both eigenvalue and mode are got for the longest cantilever ting condition, the sensitivity of stability to various loads being analyzed. It is concluded that the unbalanced weight and the falling of basket are the main factors.

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