scholarly journals Experimental Study of the Structural Behaviour of Reinforced Concrete Box Girder with the Using of Steel Plates Strengthening and Different Shapes of Cells

2021 ◽  
Vol 14 (1) ◽  
pp. 86-95
Author(s):  
Zahraa Sermed Zuhdiy ◽  
Ali Laftah Abbas
Keyword(s):  
Reinforced Concrete ◽  
Crack Width ◽  
Ultimate Load ◽  
Steel Plates ◽  
Structural Behaviour ◽  
Box Girders ◽  
Box Girder ◽  
Rectangular Cell ◽  
Circular Cell ◽  
Concrete Box Girder

The aim of this research is to study the effect of using corrugated steel plate strengthening on the structural behaviour of reinforced concrete box girder by using corrugated steel plates with vertical and horizontal corrugation and studying the effect of the shape of cells by using rectangular and circular shape with the same web width and strengthening the circular cell with smooth plate. Five simply supported reinforced concrete box girders are casted by using Self-compacting concrete and experimentally tested under four-point load. The box girder specimens are divided into two groups according to the steel strengthening and the shape of cells. The experimental results showed that in the first group, the using of the vertical and horizontal corrugated steel plates strengthening increased the ultimate load by (7.14% and 11.03%) respectively compared with the control box girder, and decreased the crack width, the results also showed that in the second group, the using of circular cell and circular strengthened cell increased the ultimate load by (17.85% and 29.22%) respectively compared with the control box girder with rectangular cell and decreased the crack width. All the box girders in the first and second group failed with diagonal shear.

Research on CFRP External Pre Stress Reinforcing Vertical Crack of Box Girder Roof

2014 ◽  
Vol 668-669 ◽  
pp. 236-239
Author(s):  
Xin Zhong Wang
Keyword(s):  
Mechanical Properties ◽  
Crack Width ◽  
Longitudinal Crack ◽  
Design Model ◽  
Vertical Crack ◽  
Box Girder ◽  
External Reinforcement ◽  
Reinforcement Efficiency ◽  
Concrete Box Girder ◽  
Reinforcement Model

the article is about longitudinal crack of concrete box girder roof, and it designed a reinforcement model. As the pre stressed material, CFRP could reach 30% of reinforcement efficiency under different loads in design model through external reinforcement upon calculation and analysis. And its crack width greatly reduces. In this way, the reinforcement purpose could be realized, and the mechanical properties of CFRP concrete could be fully played. The effect is obvious.

scholarly journals Numerical Analysis of Temperature Influence on Transverse Cracks in Concrete Box-Girder Bridges

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Hanzheng Xu ◽  
Xiaofeng Yan
Keyword(s):  
Numerical Analysis ◽  
Highway Bridges ◽  
Hydration Reaction ◽  
Box Girders ◽  
Transverse Cracks ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges

Concrete box-girder bridges are widely used in China. During several routine inspections of two-year-old highway bridges of this type in the China Central Plains region, we found that transverse cracks are widespread on the bottom flanges of those box girders, mainly distributed in the area of 1/4L to 3/4L of the span. Selected cracks were then monitored continuously for one year. Our results showed that there had been no change in the widths of the cracks, but their lengths had increased and new cracks had formed. Taking into consideration factors like hydration reaction, relative humidity difference, shrinkage and creep, sunlight thermal differential effect, sudden temperature change, vehicle load, and their combined efforts, we have developed spatial structural models and conducted stress analyses on the reinforced concrete and prestressed concrete box-girder bridges, respectively. Our numerical analysis results indicated that the hydration reaction is the main reason for the initial bottom flange crack and the temperature difference between the inside and the outside of the box girders caused the crack developments at the later stage.

scholarly journals Acoustic Emission Monitoring of Multicell Reinforced Concrete Box Girders Subjected to Torsion

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Marya Bagherifaez ◽  
Arash Behnia ◽  
Abeer Aqeel Majeed ◽  
Chai Hwa Kian
Keyword(s):  
Acoustic Emission ◽  
Reinforced Concrete ◽  
Cross Sections ◽  
Analysis Data ◽  
Damage Localization ◽  
Box Girders ◽  
Box Girder ◽  
Value Analysis ◽  
Damage Propagation ◽  
Torsion Fracture

Reinforced concrete (RC) box girders are a common structural member for road bridges in modern construction. The hollow cross-section of a box girder is ideal in carrying eccentric loads or torques introduced by skew supports. This study employed acoustic emission (AE) monitoring on multicell RC box girder specimens subjected to laboratory-based torsion loading. Three multicell box girder specimens with different cross-sections were tested. The aim is to acquire AE analysis data indicative for characterizing torsion fracture in the box girders. It was demonstrated through appropriate parametric analysis that the AE technique could be utilized to effectively classify fracture developed in the specimens for describing their mechanical behavior under torsion. AE events localization was presented to illustrate the trend of crack and damage propagation in different stages of fracture. It could be observed that spiral-like patterns of crack were captured through AE damage localization system and damage was quantified successfully in different stages of fracture by using smoothedb-value analysis.

A materially nonlinear finite element model for the analysis of curved reinforced concrete box-girder bridges

1993 ◽  
Vol 20 (5) ◽  
pp. 754-759 ◽  
Author(s):  
S. F. Ng ◽  
M. S. Cheung ◽  
J. Q. Zhao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Element Model ◽  
Nonlinear Material ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Girder Bridges ◽  
Concrete Box Girder ◽  
Concrete Box Girder Bridges

A layered finite element model with material nonlinearity is developed to trace the nonlinear response of horizontally curved reinforced concrete box-girder bridges. Concrete is treated as an orthotropic nonlinear material and reinforcement is modeled as an elastoplastic strain-hardening material. Due to the fact that the flanges and webs of the structure are much different both in configuration and in the state of stresses, two types of facet shell elements, namely, the triangular generalized conforming element and the rectangular nonconforming element, are adopted to model them separately. A numerical example of a multi-cell box-girder bridge is given and the results are compared favourably with the experimental results previously obtained. Key words: finite element method, curved box-girder bridges, reinforced concrete, nonlinear analysis.

Structural Behaviour of Beam with HDPE Plastic Balls Subjected to Flexural Load

2017 ◽  
Vol 889 ◽  
pp. 270-274
Author(s):  
Noridah Mohamad ◽  
Wan Inn Goh ◽  
Abdul Aziz Abdul Samad ◽  
A. Lockman ◽  
Anas Alalwani
Keyword(s):  
Reinforced Concrete ◽  
High Density Polyethylene ◽  
Concrete Beam ◽  
Ultimate Load ◽  
Reinforced Concrete Beam ◽  
Crack Pattern ◽  
Maximum Deflection ◽  
Structural Behaviour ◽  
Tension Cracks ◽  
Spherical Voids

This paper presents the structural behaviour of reinforced concrete beam embedded with high density polyethylene balls (HDPE) subjected to flexural load. The HDPE balls with 180 mm diameter were embedded to create the spherical voids in the beam which lead to reduction in its self-weight. Two beam specimens with HDPE balls (RC-HDPE) and one solid beam (RC-S) with dimension 250 mm x 300 mm x 1100 mm were cast and tested until failure. The results were analysed in the context of its ultimate load, load-deflection profile, and crack pattern and failure mode. It was found that the ultimate load of RC-HDPE was reduced by 32% compared to RC-S beam while the maximum deflection at its mid span was increased by 4%. However, RC-HDPE is noticed to be more ductile compared to RC-S beam. Both types of beams experienced flexure cracks and diagonal tension cracks before failure.

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