Study on the Dynamic Response of Prestressed Concrete Beam under Explosive Load

2014 ◽  
Vol 672-674 ◽  
pp. 1890-1893
Author(s):  
Yu Lan Wang ◽  
Yan Zhao Li
Keyword(s):  
Finite Element ◽  
Dynamic Load ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Dynamic Performance ◽  
Explosive Load ◽  
Element Analysis ◽  
Prestressed Concrete Beam ◽  
Stress And Deformation ◽  
Prestressed Reinforcement

The dynamic performance of the 12m span prestressed concrete beam is analyzed by finite element method. Based on the finite element analysis, with the change of the peak dynamic load, the risetime of dynamic load and the reinforcement ratio of prestressed reinforcement, the change laws of mid-span maximum deflection and the maximum stress of prestressed reinforcement in prestressed concrete beam are studied. At the same time, have further understanding to the stress and deformation of the prestressed concrete beam under explosive load. It can provide references for study on dynamic performance of the prestressed concrete beam under explosive load.

Finite Element Analysis of the Corrosion Prestressed Concrete Beam

2012 ◽  
Vol 204-208 ◽  
pp. 3040-3043
Author(s):  
Hong Bo Zou ◽  
Xiao Yong Luo
Keyword(s):  
Finite Element ◽  
Corrosion Rate ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Mechanical Performance ◽  
Load Capacity ◽  
Element Model ◽  
Ultimate Load Capacity ◽  
Element Analysis ◽  
Prestressed Concrete Beam

Based on analysis of the Corrosion prestressed concrete beam with finite element model, the paper presents the mechanical performance of concrete beams in different corrosion rates. When the corrosion rate is less than 5%, the strand corrosion has little impact on the load capacity. With the increase of the corrosion rate more than 5%, what damage happened to Beam is little steel damage and brittle damage even without apparent warning and at the same time the Corrosion of steel strand will cause the decrease of the ultimate load capacity with the deterioration of ductility.

Research on Monitoring Technology of Long-Span Prestressed Concrete Construction

2012 ◽  
Vol 170-173 ◽  
pp. 3145-3152
Author(s):  
Ji Liang Liu ◽  
Ming Jin Chu ◽  
Shu Dong Xu ◽  
Ying Ying Yin
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Simulation Analysis ◽  
Reference Value ◽  
Element Model ◽  
Construction Process ◽  
Finite Element Software ◽  
Prestressed Concrete Beam ◽  
Comprehensive Service

The author performs simulation analysis on construction process of roofing prestressed concrete beam of comprehensive service center in Beijing Institute of Civil Engineering and Architecture by finite element software Midas/Gen, so as to determine the monitoring programme according to the analysis results. The monitoring results indicate that the structure is safe; the theoretical value of simulation analysis is well matched with actual monitoring value, which means that the finite element model of construction process of roofing prestressed concrete beam is correct, the simulation method is feasible and the construction process is reasonable. It has important reference value for construction and monitoring of subsequent similar projects.

Deflection Analysis of Externally Prestressed Concrete Beam Based on Damage Mechanics

2010 ◽  
Vol 163-167 ◽  
pp. 928-932
Author(s):  
Hui Xia Xiong ◽  
Yu Zhou Sima ◽  
Yao Ting Zhang
Keyword(s):  
Finite Element ◽  
Constitutive Equation ◽  
Prestressed Concrete ◽  
Damage Mechanics ◽  
Concrete Beam ◽  
Finite Element Program ◽  
Value Analysis ◽  
Prestressed Concrete Beam ◽  
Deflection Analysis ◽  
Concrete Materials

This article describes the static experiment of externally prestressed concrete beam under the beeline reinforcing patterns. It adopts the damage mechanics - superimposed load - finite element method, uses damage constitutive equation to replace the constitutive equation, which does not take the damage into account, self-compiled eight-node uniform-parameter element superimposed load finite element program is used to analyze the forced distortion of experimental beam. The value analysis results show: the damage mechanics can soundly reflect the complicated behaviors of concrete materials in the load-superimposing process and has obtained the values of the concrete material damage characteristic parameters and achieved the results that are consistent with the experiment. Therefore, damage mechanics has provided a new way in studying the nonlinear behaviors of concrete materials.

Experimental Study on Mechanical Performance of Unbonded and Bonded Prestressed Concrete Beams

2012 ◽  
Vol 178-181 ◽  
pp. 2387-2392
Author(s):  
Jian Su ◽  
Nan Gai Yi ◽  
Zong Guang Sun ◽  
Yang Bai ◽  
Ai Guo Zhang
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Mechanical Performance ◽  
Concrete Beams ◽  
Stress And Strain ◽  
Strain Variation ◽  
Yield Strain ◽  
Prestressed Concrete Beam ◽  
Bearing Load ◽  
Prestressed Reinforcement

The experiment which based on the stress performance of unbonded and bonded prestressed concrete beam, has made a systematically research on the stress and strain variation law of pretressing tendon in the aforementioned reinforcement prestressed concrete structure. When the bonded prestressed concrete beam bearing load, there is a larger variation in stress and strain of prestressing reinforcement along the length. The maxima of stress and strain of prestressing reinforcement in bonded prestressed concrete beam appears in midspan, it is achieved the yield stress and yield strain, the minima appears in bearing, the stress and strain of prestressing reinforcement in bonded prestressed concrete beam is proportional to the distortion. The stress and strain of prestressed reinforcement in unbonded prestressed concrete beam is almost the same along the length.

Prestressed Concrete Beam Bridge Design and Main Parameters of Prestressed Steel Beam Calculations and Arrangement

2014 ◽  
Vol 496-500 ◽  
pp. 2501-2504
Author(s):  
Xi Jun Yin
Keyword(s):  
Cross Section ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Steel Beam ◽  
Prestressed Concrete Beam ◽  
Steel Welds ◽  
Prestressed Reinforcement ◽  
Edge Cracking ◽  
Beam Bridge ◽  
Beam Edge

Prestressed concrete beam bridge cross-section using T-shaped cross-section. Anti-shrinkage reinforcement requirements adopted under the dense arrangement of all the memorial steel welds are double-sided welding, using a special form of prestressed reinforcement arranged in assembly is completed, tension on the deck to prevent the beam edge cracking.

Finite Element Analysis of Unbonded Prestressed Concrete Silos

2014 ◽  
Vol 578-579 ◽  
pp. 60-65
Author(s):  
Guang Shu Xu ◽  
Huan Qin Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Prestressed Concrete ◽  
Seismic Analysis ◽  
Structural Response ◽  
Response Analysis ◽  
Element Analysis ◽  
Paper Making ◽  
Pile Caps ◽  
Prestressed Reinforcement

in this paper, making coal storage silo that diameter is a 120 m as the background, researched warehouse wall and pile caps using finite element method. In articles, the finite element analysis of soil, study the influence of prestressed reinforcement about prestressed effect, the structural response analysis under different stack forms and seismic analysis. The results show that: inside and outside temperature difference makes maximum stress, full load can reflect the other coal pile forms, the ability of resist the earthquake is strong.

The Measuring Test and Finite Element Analysis for Prestressed Concrete Beams

2011 ◽  
Vol 105-107 ◽  
pp. 1052-1055
Author(s):  
Yang Li ◽  
Li Jiao Shen
Keyword(s):  
Finite Element ◽  
Prestressed Concrete ◽  
Low Cost ◽  
Security Threat ◽  
Element Analysis ◽  
Indirect Measure ◽  
Measure Methods ◽  
History Of ◽  
Finite Element Numerical Simulation ◽  
Prestressed Reinforcement

Based on one prestressed frame beam in an actual project, both the indirect measuring test and the finite element numerical simulation about the reinforcement prestress are made. The test and simulation results show that the effect prestress obtained from indirect measure methods can reflect the prestress history relatively well. Meanwhile, the indirect measure method has the advantages of low cost and easy operation, which can be exploited and developed in general projects so as to get the stress history of the prestressed reinforcement in time and reduce potential security threat.

Study on a New Linear Arrangement of Prestressed Concrete Beam

2011 ◽  
Vol 94-96 ◽  
pp. 1471-1475
Author(s):  
Chun Bao Li ◽  
Qing Wang
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Fundamental Principle ◽  
Torsional Moment ◽  
Linear Arrangement ◽  
Prestressed Concrete Beam ◽  
Torsion Moment ◽  
Load Tests ◽  
Prestressed Reinforcement

A new kind of prestressed concrete beams with spiral broken line cables subjected to torsions is present based on the fundamental principle of equivalent loads of prestressed reinforcement. It carried out the emulation analyses and load tests of the beams on spiral broken line cables and the general prestressed concrete beams with longitudinal cables. The results showed that the spiral broken line cables effectively postpone the cracking of the beam and increased both crack torsional moment and ultimate torsion moment, and kept some ductility.

Model Updating of Full Prestressed Concrete Beam Based on Bayesian Theory

2011 ◽  
Vol 304 ◽  
pp. 107-114
Author(s):  
C.Y. Fang ◽  
Yao Ting Zhang
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Model Updating ◽  
Screening Method ◽  
Bayesian Theory ◽  
Model Parameters ◽  
Element Analysis ◽  
Prestressed Concrete Beam ◽  
The Difference ◽  
Full Prestressed Concrete Beam

Model updating based on Bayesian theory for the prediction of natural frequencies of full prestressed concrete beam has been developed. Morris screening method is employed to study the sensitivity of model parameters and elastic modulus and density of concrete are determined to be updated. Cooperative work between finite element analysis program and Markov chain generating program is realized, and multiple chains with different starting points are designed to obtain the posterior distribution of model parameters. It is found that standard deviations of posterior estimates decrease compared to those of prior distributions. In addition, different starting points are selected to discuss their influence on posterior estimates of model parameters. On reducing the uncertainty of posterior estimate, the difference of each natural frequency used as witness resource is compared.

scholarly journals FINITE ELEMENT MODELING OF CAMBER OF PRESTRESSED CONCRETE BEAMS

2017 ◽  
Vol 13 (4) ◽  
pp. 58-65
Author(s):  
Peter P. Gaigerov
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
Numerical Experiments ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Reinforced Concrete Beam ◽  
Prestressed Reinforcement ◽  
The Impact ◽  
Relief Efforts

For large-span reinforced concrete beam structures developed by the method of determining the camber due to the prestressing of a steel rope on the concrete. Performed numerical experiments to study the impact of various schemes layout prestressed reinforcement without bonding with concrete on the distribution of the relief efforts along the path of the reinforcement.

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