Estimation Method for Prestress Loss of Externally Prestressed Composite Girder Bridges

2014 ◽  
Vol 919-921 ◽  
pp. 547-550
Author(s):  
Yong Ming Zhao ◽  
Hong Xue Li ◽  
Xue Wei Wang
Keyword(s):  
Estimation Method ◽  
Design Parameters ◽  
Prestress Loss ◽  
Temperature Changes ◽  
Concrete Shrinkage ◽  
Girder Bridges ◽  
Composite Girder ◽  
Prestressing Loss ◽  
Simplified Calculation ◽  
Prestressing Tendon

To accurately calculate the prestress of externally prestressed composite girder bridges, the six critical factors (the prestressing tendon withdrawal and anchor deformation, friction between prestressing tendon and deviator, prestressing tendon relaxation, concrete creep, concrete shrinkage and temperature changes) that cause the prestress loss of such type of the bridges are summarized and the corresponding simplified calculation methods are respectively derived on the basis of the existing researches. The prestressing tendons ability has an important influence on the mechanical behavior of prestressed composite girder bridges, which is the key design parameters. Prestress loss will occur in the process of long-term use, so that the whole beam stress redistribution occurs. How to accurately calculate the value of the prestressing loss is an issue of great concern to engineers. And at present there is few research for prestressed composite girder bridges. On the basis of existing research, this paper summarizes the key factors that lead to loss of prestress and derives the corresponding simplified calculation method for design reference.

scholarly journals Application of Composite Structures in Bridge Engineering. Problems of Construction Process and Strength Analysis

2015 ◽  
Vol 15 (4) ◽  
pp. 57-85
Author(s):  
Kazimierz Flaga ◽  
Kazimierz Furtak
Keyword(s):  
Composite Structures ◽  
Highway Bridges ◽  
Strength Properties ◽  
Bridge Engineering ◽  
Strength Analysis ◽  
Shear Connectors ◽  
Concrete Shrinkage ◽  
Girder Bridges ◽  
Composite Girder ◽  
Orthotropic Steel Plate

Abstract Steel-concrete composite structures have been used in bridge engineering from decades. This is due to rational utilisation of the strength properties of the two materials. At the same time, the reinforced concrete (or prestressed) deck slab is more favourable than the orthotropic steel plate used in steel bridges (higher mass, better vibration damping, longer life). The most commonly found in practice are composite girder bridges, particularly in highway bridges of small and medium spans, but the spans may reach over 200 m. In larger spans steel truss girders are applied. Bridge composite structures are also employed in cable-stayed bridge decks of the main girder spans of the order of 600, 800 m. The aim of the article is to present the cionstruction process and strength analysis problems concerning of this type of structures. Much attention is paid to the design and calculation of the shear connectors characteristic for the discussed objects. The authors focused mainly on the issues of single composite structures. The effect of assembly states on the stresses and strains in composite members are highlighted. A separate part of problems is devoted to the influence of rheological factors, i.e. concrete shrinkage and creep, as well as thermal factors on the stresses and strains and redistribution of internal forces.

Frictional Loss of Prestress Caused by Locally Deflected Tendons in Prestressed Concrete Girder Bridges

2015 ◽  
Vol 1119 ◽  
pp. 716-720 ◽  
Author(s):  
Kyung Joon Shin ◽  
Yun Yong Kim ◽  
Hwan Woo Lee
Keyword(s):  
Economic Efficiency ◽  
Prestressed Concrete ◽  
Prestress Loss ◽  
Frictional Loss ◽  
Girder Bridges ◽  
The World ◽  
Design And Construction ◽  
Prestressing Tendon ◽  
Concrete Girder

Prestressed concrete girder bridges are one of the most widely used bridges in the world because of their excellent construction feasibility, economic efficiency, serviceability, and safety. In certain situations, however, the prestressing tendon is supposed to be bent locally, and this leads to the loss of prestress force. This kind of prestress loss is not considered in the design and construction processes. This study shows that prestress loss occurs at the locally bent tendon, and that a 2% maximum of prestress loss occurs at the locally bent tendon, due to eccentricity.

Optimized Prestressed Continuous Composite Girder Bridges with Corrugated Steel Webs

2017 ◽  
Vol 22 (2) ◽  
pp. 04016121 ◽  
Author(s):  
Jian-Guo Nie ◽  
Ying-Jie Zhu ◽  
Mu-Xuan Tao ◽  
Chao-Ran Guo ◽  
Yi-Xin Li
Keyword(s):  
Girder Bridges ◽  
Composite Girder

Analysis of Skewed Composite Girder Bridges

1968 ◽  
Vol 94 (4) ◽  
pp. 919-941
Author(s):  
William C. Gustafson ◽  
Richard N. Wright
Keyword(s):  
Girder Bridges ◽  
Composite Girder

scholarly journals Refined Finite Element Analysis of Crack Causes in SRC Arch Rib Bridges considering Multiple Factors

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Mengsheng Yu ◽  
Nianchun Deng ◽  
Qifeng Chen ◽  
Tianzhi Hao
Keyword(s):  
Steel Frame ◽  
Element Analysis ◽  
Shrinkage Temperature ◽  
Arch Bridge ◽  
Temperature Changes ◽  
Concrete Shrinkage ◽  
Shrinkage Process ◽  
Crack Problems ◽  
Arch Bridges ◽  
Bearing Structure

The SRC (steel-frame reinforced concrete) arch bridge is an important part of the development of arch bridges. Scholars worldwide have studied it from various aspects because of its stronger stiffness and stability than other types of bridges especially when crossing the canyon. The steel frame is a stress bracket during construction. Concrete becomes the main axial-pressure bearing structure when it fills the inner pipe and the encased frame. This article mainly focuses on the crack problems of SRC arch bridging during the postconstruction operation, local model of the midspan arch rib, and the equivalent relationship between the coefficient of expansion and the temperature of concrete. This study uses a cooling method to simulate the shrinkage process with detailed analysis of three properties including concrete shrinkage, temperature gradients, and concentrated hanger rod force. It is concluded that the SRC arch bridge will have large tensile stress on both inner and outer surfaces of slab and web when the temperature changes, and it is the main cause of cracks. The results agree well with measured data. At last, we come up with some reference suggestions in the design and construction of similar bridges in the future.

scholarly journals Analyses of sway bracing members in composite-girder bridges.

1987 ◽  
pp. 115-124
Author(s):  
Nobutoshi MASUDA ◽  
Chitoshi MIKI ◽  
Hiroyuki KASHIWAGI ◽  
Hiroshi KAIDOH
Keyword(s):  
Girder Bridges ◽  
Composite Girder
Sign in / Sign up

Export Citation Format

Share Document