The Analysis of Impact Coefficient on Reinforced-Concrete Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 786-789
Author(s):  
Chun Xiang Qi ◽  
Fei Xia ◽  
Run Feng Zhang
Keyword(s):  
Reinforced Concrete ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Reinforced Concrete Bridge ◽  
Detection Technology ◽  
Impact Coefficient ◽  
Set Up ◽  
Beam Bridge ◽  
Bridge Spans ◽  
The Impact

In order to discuss the displacement impact coefficient of the simply supported beam bridge, reinforced-concrete simply supported beam models with different span and different section stiffness are set up using the finite element method in the paper. The maximum dynamic displacement of beam models under the running vehicle is calculated. Combined with the maximum static displacement, the corresponding impact coefficients of models are calculated. At the same time, the modal analysis of beams is conducted to calculate the impact coefficient based on the base frequency. From comparing with the displacement impact coefficient, the bridge spans and section stiffness influence on impact coefficient is analyzed. Results show that the influence of section stiffness on impact coefficient can be ignored, but the influence of the change of span cannot be ignored. It will provide a reference for designing and detection technology of reinforced-concrete simply supported beam.

The Natural Frequency Calculation Method of Simply-Supported Beam in the Sunshine Temperature Field

2013 ◽  
Vol 394 ◽  
pp. 364-367
Author(s):  
Yong Chun Cheng ◽  
Yu Ping Shi ◽  
Guo Jin Tan
Keyword(s):  
Temperature Field ◽  
Calculation Method ◽  
Natural Frequencies ◽  
Bernoulli Model ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Frequency Calculation ◽  
Natural Frequency Calculation ◽  
Beam Bridge ◽  
T Beam

The related researches show that , the sunshine temperature field can cause the changes of the natural frequencies of the simply-supported beam. In order to recover the influence law of the temperature field on the natural frequencies, the calculation method of the natural frequencies of the simply-supported beam bridge is formed. First, according to the principles of stress equivalence, transform the sunshine temperature field to the partiality axis forces. Based on the Bernoulli model, the calculation method of the natural frequencies of the simply-supported beam under the partiality axis forces at both ends is formed. At last, take one simply-supported T beam as the object of numerical modeling and verify the validity and the reliability of this method.

Damage Detection Using Piezoelectrics Modal Analysis and PSD Technique

2000 ◽  
Author(s):  
Sauro Liberatore ◽  
Gregory P. Carman
Keyword(s):  
Theoretical Model ◽  
Damage Detection ◽  
State Space Model ◽  
Piezoelectric Sensor ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Power Spectral ◽  
Frequency Changes ◽  
Set Up ◽  
Aluminum Beam

Abstract A damage detection method has been implemented on a simply supported beam structure. The method is developed with both a theoretical model and experimental results. The simply supported beam contains one piezoelectric actuator and one piezoelectric sensor. The theoretical model was obtained from an energy formulation and a Rayleigh-Ritz approach. Matrices were composed in a State Space model to reproduce the input-output system between actuator and sensor. The damage was modeled with material properties variations. The experimental set up consisted of an aluminum beam with damage introduced by adding different weights in various locations. The dynamic changes produced were investigated and compared with theoretical prediction with reasonable agreement obtained. In order to quantify the size of damage, Power Spectral Density approach was used. To locate damage, frequency changes were used.

The Impact of Corrosion on the Seismic Assessment of Reinforced Concrete Bridge Piers

2021 ◽  
pp. 718-725
Author(s):  
Alessandro Rasulo ◽  
Angelo Pelle ◽  
Giuseppe Quaranta ◽  
Davide Lavorato ◽  
Gabriele Fiorentino ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Assessment ◽  
Bridge Piers ◽  
Concrete Bridge ◽  
Reinforced Concrete Bridge ◽  
The Impact

scholarly journals Study on Concrete Pier Impact Performance after Implementing Equal Cross-Section Stainless Steel with Protection from Closed-Cell Aluminum Foam

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Xiwu Zhou ◽  
Honglong Zhang ◽  
Wenchao Zhang ◽  
Guoxue Zhang
Keyword(s):  
Stainless Steel ◽  
Reinforced Concrete ◽  
Aluminum Foam ◽  
Bridge Piers ◽  
Concrete Bridge ◽  
Reinforced Concrete Bridge ◽  
Impact Forces ◽  
Closed Cell ◽  
Steel Bars ◽  
The Impact

In the present study, in order to examine the impact performances of ordinary reinforced concrete bridge piers which have been replaced by stainless-steel bars of equal cross-sections under the protective condition of anticollision material, the impact dynamic responses of the ordinary reinforced concrete bridge piers, with replacements under the protection of closed-cell aluminum foam, were compared and analyzed using an ultrahigh drop hammer impact test system. The results showed that when the impact velocity was small (for example, less than 1.42 M/s), after the implementation of equal cross-sectional replacements, the closed-cell aluminum foam had been in an elastic or yield stage. During that stage, the impact forces of the stainless-steel reinforced concrete piers were larger than those of the ordinary reinforced concrete piers, and the relative ratios were stable at approximately 28 to 34%. In addition, the relative ratios of the displacements at the tops of the components were also found to be stable at approximately 22%, and the change rates of the concrete ultrasonic damages were approximately the same. However, when the impact forces had increased (for example, more than 1.67 m/s), the closed-cell aluminum foam entered a densification stage, and the peak impact force ratios decreased sharply. It was also observed that the relative peak displacement ratios at the tops of the components displayed increasing trends, and the change rates of the concrete ultrasonic damages had displayed major flux. Therefore, the replacement of the ordinary piers with stainless-steel bars had increased the possibility of shear failures.

Analysis on Factors that Affect the Damping of Reinforced Concrete Beam under Hammering Method

2011 ◽  
Vol 374-377 ◽  
pp. 2130-2133
Author(s):  
Da Peng Gu ◽  
Wei Ming Yan ◽  
Yan Jiang Chen ◽  
Hai Xia Zhou
Keyword(s):  
Reinforced Concrete ◽  
Parameter Identification ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Rational Method ◽  
Beam Model ◽  
Dynamic Experiment ◽  
Simply Supported Beam ◽  
Dynamic Behaviors ◽  
Simply Supported

Abstract. Damping, as one of the most important indicators of the structure’s dynamic behaviors, depicts how energy dissipates during vibration. Using Hammering Method on Reinforced Concrete Simply Supported Beam model dynamic experiment, by analyzing the vibrating signals captured during hammering process, how the allocation of the sensors and the hammer strength affect the parameter identification can be revealed. A rational method of parameter identification can be presented as well.

scholarly journals Seismic Collapse Analysis of RC Highway Bridges Based on a Simplified Multiscale FE Modeling Approach

2017 ◽  
Vol 2017 ◽  
pp. 1-19
Author(s):  
Menghan Hu ◽  
Qiang Han ◽  
Xiuli Du ◽  
Xiao Liang
Keyword(s):  
Computational Efficiency ◽  
Highway Bridges ◽  
Multiscale Model ◽  
Fe Modeling ◽  
Simply Supported Beam ◽  
Shell Elements ◽  
Simply Supported ◽  
Beam Elements ◽  
Seismic Collapse ◽  
Beam Bridge

Multiscale finite element (FE) modeling offers a balance between computational efficiency and accuracy in numerical simulations, which is appropriate for analysis of seismic collapse of RC highway bridges. Some parts of structures that need detailed analysis can be modeled by solid elements, while some subordinate parts can be simulated by beam elements or shell elements to increase the computational efficiency. In the present study, rigid surface coupling method was developed to couple beam elements with solid elements using the LS-DYNA software. The effectiveness of this method was verified by performing simulation experiments of both a single-column pier and a two-span simply supported beam bridge. Using simplified multiscale FE modeling, analyses of collapse and local failure of a multispan simply supported beam bridge and a continuous rigid frame bridge were conducted to illustrate the approach in this paper. The results demonstrate that the simplified multiscale model reasonably simulates the collapse process and local damage of complex bridges under seismic loading.

The Application of E Shaped Steel Bearing on the Simply Supported Beam Bridge

2011 ◽  
Vol 90-93 ◽  
pp. 3141-3144
Author(s):  
Ling Jun Kong ◽  
Yan Bei Chen ◽  
Jun Liu ◽  
Qi Bin Jiang
Keyword(s):  
Computational Models ◽  
Time History ◽  
Earthquake Response ◽  
Bending Moments ◽  
Shear Forces ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Related Data ◽  
Nonlinear Time History ◽  
Beam Bridge

To study the application of E shaped steel bearing on the simply supported beam bridge, the Xinhua bridge is analyzed by the nonlinear time-history method and the Midas/Civil software, considering the interaction between pile and soil. The related data are obtained through two computational models. And the data are compared in this paper. The results show that the bending moments and shear forces of the bottom of the fixed pier are reduced, due to using the E shaped steel bearing at the fixed pier. The E shaped steel bearing dissipates the earthquake energy and reduces the earthquake response of the bridge.

Research on the Natural Frequency Solving Method of the Simply Supported Beam Bridge with Cracks

2013 ◽  
Vol 437 ◽  
pp. 51-55
Author(s):  
Ping Yi Sun ◽  
Yan Hua Wang ◽  
Han Bing Liu ◽  
Guo Jin Tan
Keyword(s):  
Natural Frequency ◽  
Natural Frequencies ◽  
Beam Model ◽  
Euler Beam ◽  
Simply Supported Beam ◽  
Simply Supported ◽  
Solution Methods ◽  
Element Approach ◽  
Experimental Values ◽  
Beam Bridge

Two kinds of natural frequency solution methods for the simply supported beam bridge with cracks are presented respectively based on the Bernoulli-Euler beam model and the finite element approach. Multiple groups of crack damages are supposed on the experimental simply supported steel I-beam, and the natural frequencies of the experimental beam are measured in all the crack cases. By comparing the calculated natural frequencies respectively obtained by the above two methods with the experimental values, the characteristics of the two kinds of natural frequency solving methods are evaluated.

Sign in / Sign up

Export Citation Format

Share Document