Anti-Shear Reliability Analysis of Existing Pretension Prestressed Concrete Beam Bridges in the Corrosion Environment with Acid Rain

2010 ◽  
Vol 150-151 ◽  
pp. 1488-1494
Author(s):  
Feng Chen ◽  
Shuan Hai He ◽  
Da Lin Hu ◽  
Bing Yuan Huang
Keyword(s):  
Bearing Capacity ◽  
Acid Rain ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Shear Failure ◽  
Safety Evaluation ◽  
Calculation Model ◽  
Corrosion Condition ◽  
Prestressed Concrete Beam ◽  
Shear Bearing Capacity

Under the acid rain corrosion condition, the shear-bearing capacity of the pretension prestressed concrete beam will attenuate gradually with the stirrup corrosion and concrete deteriorate. Moreover, the stress corrosion cracking failure and the bond force degradation of the prestressed wires that caused by the aggravated corrosion mediator ingress will further increase the shear failure risk of the pretension prestressed concrete structure without any symptom. The paper presents a shear bearing capacity calculation model of the pretension prestressed concrete beam bridge and discuss the time-variation model of the stirrup corrosion considering the effective prestress attenuation under the acid rain corrosion condition. The analysis method on anti-shear reliability of existing pretension prestressed concrete beam bridges under the sodium sulfate corrosion condition is proposed then. The method will be used in the durability and safety evaluation of the shear-bearing capacity of the existing pretension prestressed concrete beam bridges in the corrosion environment with acid rain.

Anti-Shear Reliability Analysis of Existing Pre-Tensioned Prestressed Concrete Beam Bridges under Atmosphere Condition

2011 ◽  
Vol 255-260 ◽  
pp. 1017-1022
Author(s):  
Feng Chen ◽  
Da Lin Hu ◽  
Yi Li Sun
Keyword(s):  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Shear Failure ◽  
Safety Evaluation ◽  
Calculation Model ◽  
Corrosion Condition ◽  
Prestressed Concrete Beam ◽  
Shear Bearing Capacity ◽  
Beam Bridge

The shear bearing capacity of pretensioning prestressed concrete beam bridge mainly depends on the stirrup and concrete of the beam, but the longitudinal pre-pressure plays a certain role for the shear bearing of the structure. Under the carbonization corrosion condition, the shear-bearing capacity of the pretensioning prestressed concrete beam will attenuate gradually with the stirrup corrosion and concrete deteriorate. And the risk of brittle shear failure will be increased with the enhanced reinforcement corrosion amount. The paper presents an anti-shear calculation model of the pretensioning prestressed concrete beam bridge, and discusses the time-variation model of the corrosion stirrup considering the effective prestress attenuation under the carbonization corrosion condition. The analysis method on the anti-shear reliability of existing pretensioning bridges under the corrosion condition is proposed then. The method will be used in the durability and safety evaluation of the shear-bearing capacity of the existing pretensioning prestressed concrete bridges.

Analysis of Damages Correlation of Prestressed Concrete Beam

2011 ◽  
Vol 94-96 ◽  
pp. 244-247
Author(s):  
Feng Peng Zhang ◽  
Zhao Guo Qiu ◽  
Han Zhi
Keyword(s):  
Elastic Modulus ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Evaluation Method ◽  
Concrete Strength ◽  
Safety Evaluation ◽  
Steel Corrosion ◽  
Corrosion Damage ◽  
Reinforcing Steel ◽  
Prestressed Concrete Beam

Damages correlation of prestressed concrete beam and its safety evaluation have been studied by finite element method. The influences of three typical damages on deflection of beam have been analyzed. The vertical crack damage (VC) has been simulated by pre-crack and contact elements has been set between crack surfaces, the reinforcing steel corrosion damage (RSC) has been simulated by reducing the effective area of the reinforcing steel, and the concrete strength degradation damage (CSD) has been simulated by changing the elastic modulus of concrete based on the relationship between concrete strength and its elastic modulus. Damage correlation variables have been defined, and safety evaluation method of concrete beam based on damage correlation has been discussed. The results showed that: there is a strong nonlinear correlation between VC and RSC, and the beam's safety states are significantly reduced because of the interaction of damages.

Influences of Installment Tensioning Technology on Bearing Capacity of Rectangular Prestressed Concrete Beam

2017 ◽  
Vol 23 (2) ◽  
pp. 122-129 ◽  
Author(s):  
Hongyan Ding ◽  
Peng Liu ◽  
Puyang Zhang ◽  
Yan Zhu ◽  
Yaohua Guo
Keyword(s):  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Prestressed Concrete Beam

Analysis of loss in flexural stiffness of in-service prestressed hollow plate beam

2019 ◽  
Vol 10 (4) ◽  
pp. 534-547
Author(s):  
Guanhua Zhang ◽  
Jiawei Wang ◽  
Jinliang Liu ◽  
Yanmin Jia ◽  
Jigang Han
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Human Life ◽  
Calculation Model ◽  
Flexural Stiffness ◽  
Loading Test ◽  
Content Type ◽  
Prestressed Concrete Beam ◽  
Non Linear ◽  
Prestressed Reinforcement

Purpose During service, cracks are caused in prestressed concrete beams owing to overload or other non-load factors. These cracks significantly affect the safety of bridge structures. The purpose of this paper is to carry out a non-linear iterative calculation for a section of a prestressed concrete beam and obtain the change in stiffness after the section cracks. Design/methodology/approach The existing stress of prestressed reinforcement was measured by performing a boring stress release test on two pieces of an in-service 16 m prestressed concrete hollow plate. Considering the non-linear effects of materials, the calculation model of the loss in the flexural stiffness of the prestressed concrete beam was established based on the existing prestress. The accuracy of the non-linear calculation method and the results obtained for the section were verified by conducting a bending destruction test on two pieces of the 16 m prestressed concrete hollow plate in the same batch and by utilising the measured strain and displacement data on the concrete at the top edge of the midspan section under all load levels. Findings The flexural stiffness of the section decreases rapidly at first and then gradually, and structural rigidity is sensitive to the initial cracking of the beam. The method for calculating the loss in the flexural stiffness of the section established with the existing stress of prestressed reinforcement as a parameter is accurate and feasible. It realizes the possibility of assessing the loss in the rigidity of a prestressed concrete structure by adopting the existing stress of prestressed reinforcement as a parameter. Originality/value A method for quickly determining the loss in the stiffness of structures using existing prestress is established. By employing this method, engineers can rapidly determine whether a bridge is dangerous or not without performing a loading test. Thus, this method not only ensures the safety of human life, but also reduces the cost of testing.

FEM Analysis of Bi-Prestressed Concrete Beam

2013 ◽  
Vol 743 ◽  
pp. 138-141
Author(s):  
Feng Gao ◽  
Tong Liu
Keyword(s):  
Constitutive Equation ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Fem Analysis ◽  
Solid Modeling ◽  
Failure Criteria ◽  
Ansys Software ◽  
Prestressed Concrete Beam ◽  
Cooling Method

Based on ANSYS software, the solid modeling method was performed to build the half model of bi-prestressed concrete beam. And the solution for solve the problem such as the constitutive equation, failure criteria , the method of modeling,the infliction method of prestressed was summarized in this paper. The heating-cooling method was used to achieve the bi-prestressed.The simulate method was reasonable while the built mode was performed to simulate the pre-arch and bearing capacity, simulate the pre-arch and bearing capacity of pre-pressed bi-prestressed concrete beam by FEM software ,and compared with the experiment results. And summarized the handling of the constitutive equation,failure criteria,the infliction method of prestressed, the method of modeling ,and so on. All of the method will provide reference for the research of Bi-prestressed concrete beam.

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