scholarly journals Seismic Fragility Analysis of Multispan Continuous Girder Bridges with Varying Pier Heights considering Their Bond-Slip Behavior

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Yang Cao ◽  
Yan Liang ◽  
Chenzi Huai ◽  
Ji Yang ◽  
Ruimin Mao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Seismic Performance ◽  
Earthquake Engineering ◽  
Great Influence ◽  
Element Model ◽  
Seismic Fragility ◽  
Bond Slip ◽  
Reliability Method

The bond-slip effect has a great influence on the seismic performance of reinforced concrete structures and ignoring it will overestimate the seismic performance of the structures. Based on the low-cyclic reversed loading experiment of a reinforced concrete column, this paper uses OpenSees to establish a nonlinear finite element model considering bond-slip and verify its correctness. In this paper, a multispan continuous girder bridge with varying pier heights is taken as an example. Considering the effect of the bond-slip behavior of steel bars, a refined finite element model based on the OpenSees platform is established to do the numerical simulation analysis. 10 seismic waves are selected from the Pacific Earthquake Engineering Research Center (PEER) according to the site condition and modulate the amplitude to 150 waves. This paper uses the incremental dynamic analysis (IDA) and the second-order reliability method to analyze the seismic fragility of bridge components and systems, respectively. Results show that the exceeding probability increases obviously when considering bond-slip, and with the increase of seismic spectral acceleration, the influence of bond-slip on the exceeding probability of components also increases; when bond-slip is considered, the difference of system fragility between the upper and lower limits under four damage states is greater than that without bond-slip.

scholarly journals Flexural Strengthening of Reinforced Concrete Beams with Mechanically Bonded Steel Plates

2021 ◽  
Author(s):  
Syed Ali Kashif
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Steel Plate ◽  
Great Influence ◽  
Element Model ◽  
Composite Beams ◽  
Design Guidelines ◽  
Reinforced Concrete Beams ◽  
Design Procedures

Steel plate bonding technology is widely accepted for the strengthening of reinforced concrete structures. Researches in the past showed that epoxy bonded steel plated composite beams are highly prone to variation in temperature and environmental conditions. This research study introduces a novel approach to steel plate composite beam in which bond between the concrete and the steel plate is provided by welding the steel plate to the legs of the uniformly spaced stirrups. Experimental investigation showed that the parameters such as interface connections, geometric dimensions, stirrups spacing and thickness of steel plate have a great influence on the strength, deformation and failure characteristics of such composite beams. A finite element model has been developed using commercial software, ABAQUS, to predict the strength of such composite beams and its performance is validated through experimental results. The direct finite element simulation of proposed composite beams with developed finite element model gives an average of experimental to predicted strength ratio of 0.99, which comfirms the accuracy of prediction. The finite element model is then used to simulate a large number of numerical beams with varying geometric and material properties to formulate design guidelines. Design charts are developed and their performance is validated through test results with experimental to design chart predictions giving an average value of 0.94. Design procedures for such beams are illustrated with calculated design examples. Such simple design procedures can be adopted in the actual design of proposed composite beams in practical applications.

scholarly journals Flexural Strengthening of Reinforced Concrete Beams with Mechanically Bonded Steel Plates

2021 ◽  
Author(s):  
Syed Ali Kashif
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Steel Plate ◽  
Great Influence ◽  
Element Model ◽  
Composite Beams ◽  
Design Guidelines ◽  
Reinforced Concrete Beams ◽  
Design Procedures

Steel plate bonding technology is widely accepted for the strengthening of reinforced concrete structures. Researches in the past showed that epoxy bonded steel plated composite beams are highly prone to variation in temperature and environmental conditions. This research study introduces a novel approach to steel plate composite beam in which bond between the concrete and the steel plate is provided by welding the steel plate to the legs of the uniformly spaced stirrups. Experimental investigation showed that the parameters such as interface connections, geometric dimensions, stirrups spacing and thickness of steel plate have a great influence on the strength, deformation and failure characteristics of such composite beams. A finite element model has been developed using commercial software, ABAQUS, to predict the strength of such composite beams and its performance is validated through experimental results. The direct finite element simulation of proposed composite beams with developed finite element model gives an average of experimental to predicted strength ratio of 0.99, which comfirms the accuracy of prediction. The finite element model is then used to simulate a large number of numerical beams with varying geometric and material properties to formulate design guidelines. Design charts are developed and their performance is validated through test results with experimental to design chart predictions giving an average value of 0.94. Design procedures for such beams are illustrated with calculated design examples. Such simple design procedures can be adopted in the actual design of proposed composite beams in practical applications.

Nonlinear Finite Element Analysis of Corroded Reinforced Concrete Lock-Walls

2011 ◽  
Vol 101-102 ◽  
pp. 329-332
Author(s):  
Fu Lai Qu ◽  
Shun Bo Zhao ◽  
Zhi Mei Zhou ◽  
Baoan Yuan
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Concrete Strength ◽  
Element Model ◽  
Steel Reinforcement ◽  
Nonlinear Finite Element ◽  
Flexural Behavior ◽  
Element Analysis ◽  
Bond Slip

Reinforcement and concrete can work together to bear load in reinforced concrete structures, one of the main reasons is the relatively prefect bond between reinforcement and concrete. When steel reinforcement corrodes, the bond strength decreases and leads to the degradation of the reinforced concrete members. This paper built a finite element model by selecting appropriate stress-strain relationship of concrete and reinforcement, bond-slip relationship between concrete and corroded steel bars. The flexural behavior of corroded reinforced concrete lock-walls was analyzed by nonlinear finite element method. The calculated results were compared with the test results to verify the reliability of the finite element model. Finally, the influence of corrosion level of steel reinforcement and concrete strength on the normal section bearing capacity of lock-walls were discussed.

Uniform loading on the reinforced concrete beam produced by the specific cylinder-shaped rubber bags fully filled with air or water

2020 ◽  
Vol 23 (9) ◽  
pp. 1934-1947
Author(s):  
Dapeng Chen ◽  
Li Chen ◽  
Qin Fang ◽  
Yuzhou Zheng ◽  
Teng Pan
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Element Model ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Uniform Loading ◽  
Air Bag

The bending behavior of reinforced concrete beams under uniform pressure is critical for the research of the blast-resistance performance of structural components under explosive loads. In this study, a bending test of five reinforced concrete beams with the dimensions of 200 mm (width) × 200 mm (depth) × 2500 mm (length) under uniform load produced by a specific cylinder-shaped rubber bag filled with air or water was conducted to investigate their flexural performances. An air bag load was applied to three of the reinforced concrete beams, a water bag load was applied to one reinforced concrete beam, and the remainder beam was subjected to the 4-point bending load. The experimental results highlighted that the air bag and water bag loading methods can be used to effectively apply uniform loads to reinforced concrete beams. Moreover, the stiffness of the air bag was improved by 123% in accordance with the initial pressure increases from 0.15 to 0.45 MPa. In addition, a finite element model of the test loading system was established using ABAQUS/Standard software. Moreover, the critical factors of the air bag loading method were analyzed using the numerical model. The calculated results were found to be in good agreement with the test data. The established finite element model can therefore be used to accurately simulate the action performances of the uniform loading technique using rubber bags filled with air or water.

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.

Sign in / Sign up

Export Citation Format

Share Document