Safety Assessment of Slant Legged Rigid Frame Bridge Based on Field Testing

2013 ◽  
Vol 574 ◽  
pp. 163-175
Author(s):  
Yan Li ◽  
Hong Tao Bi ◽  
Bing Han Li ◽  
Yong Jun Wang
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Bearing Capacity ◽  
Field Testing ◽  
Control Measures ◽  
Original Design ◽  
Loading Test ◽  
Element Analysis ◽  
Rigid Frame ◽  
Rigid Frame Bridge

The safety and load-bearing capacity of an in-service urban reinforced concrete slant leg rigid frame bridge over railway is assessed by field testing and finite element analysis. The bridge is located in Qitaihe city, the northeastern of China. The two heavy trucks and three different loading test configurations are used in experiment. The three load figuration is set up and performed based on the result of technical condition investigation and finite element numerical analysis. The vertical displacement and key section strain response are recorded during experiment. Loading-bearing capacity and safety performance of the bridge is analyzed and evaluated according to measured data combining with numerical analysis. The testing result shows that structural stiffness and strength of the bridge do not satisfy the requirements of the original design. Based on the assessment result, some proposals are proposed to the management office. A moderate maintenance and reinforcement treatment should be carried out for this bridge to improve the bearing capacity and ensure safety operation. Before that completed some traffic control measures should be taken to avoid aggravating diseases and damages of the bridge due to passing heavy vehicle.

scholarly journals Analysis of Non-Uniform Shrinkage Effect in Box Girder Sections for Long-Span Continuous Rigid Frame Bridge

2018 ◽  
Vol 13 (2) ◽  
pp. 146-155 ◽  
Author(s):  
Zhuoya Yuan ◽  
Pui-Lam Ng ◽  
Darius Bačinskas ◽  
Jinsheng Du
Keyword(s):  
Finite Element ◽  
General Purpose ◽  
Element Analysis ◽  
Box Girder ◽  
Finite Element Program ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Shrinkage Effect ◽  
Rigid Frame Bridge

To consider the effect of non-uniform shrinkage of box girder sections on the long-term deformations of continuous rigid frame bridges, and to improve the prediction accuracy of analysis in the design phase, this paper proposes a new simulation technique for use with general-purpose finite element program. The non-uniform shrinkage effect of the box girder is transformed to an equivalent temperature gradient and then applied as external load onto the beam elements in the finite element analysis. Comparative analysis of the difference in deflections between uniform shrinkage and nonuniform shrinkage of the main girder was made for a vehicular bridge in reality using the proposed technique. The results indicate that the maximum deflection of box girder under the action of non-uniform shrinkage is much greater than that under the action of uniform shrinkage. The maximum downward deflection of the bridge girder caused by uniform shrinkage is 5.6 mm at 20 years after completion of bridge deck construction, whereas the maximum downward deflection caused by non-uniform shrinkage is 21.6 mm, which is 3.8 times larger. This study shows that the non-uniform shrinkage effect of the girder sections has a significant impact on the long-term deflection of continuous rigid frame bridge, and it can be accurately simulated by the proposed transformation technique.

SEISMIC BEHAVIOR OF A NEW TYPE OF STEEL–CONCRETE COMPOSITE RIGID CONNECTION

2011 ◽  
Vol 05 (03) ◽  
pp. 283-296 ◽  
Author(s):  
X. NIE ◽  
J. S. FAN ◽  
Y. J. SHI
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Seismic Behavior ◽  
Structural Performance ◽  
Element Analysis ◽  
Maintenance Costs ◽  
Rigid Frame ◽  
Rigid Connection ◽  
New Type ◽  
Rigid Frame Bridge

The composite steel–concrete rigid frame bridge is composed of steel or composite girders connecting rigidly to RC piers, and has advantages of lower maintenance costs, faster construction, and higher resistance and ductility during an earthquake. In this paper, a new type of steel–concrete composite rigid connection is developed and studied by finite element analysis. The comparison with other types of connections shows that this new type of connection has a good structural performance from the confining of concrete by steel and preventing the buckling of steel by concrete.

Finite Element Analysis about Dynamic Characteristics of the High-Pier and Long-Span Continuous Rigid Frame Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 1876-1880
Author(s):  
Ying Wang ◽  
Jian Xin Liu ◽  
Chong Wang
Keyword(s):  
Finite Element ◽  
Dynamic Characteristics ◽  
Time History ◽  
Response Analysis ◽  
Bridge Structure ◽  
Element Analysis ◽  
Long Span ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Rigid Frame Bridge

A structure model of three-span continuous rigid frame bridge was constructed based on the finite element method. At first, the modal analysis was performed to get the natural frequencies and periods. The dynamic characteristics of the bridge structure were summarized, and some improvement measures are suggested to overcome the shortcoming for the bridge structure. Then, seismic response analysis was carried out based on the EL-Centro wave. The input excitations adopted the combination of vertical wave plus longitudinal wave, or vertical wave plus lateral wave. Based on the two excitation cases, some useful results were obtained, which include internal forces, displacements, accelerations time-history curves of the critical sections for the bridge structure. And some commentates about the time-history curves are given. At last, some helpful conclusions are drawn based on the calculation and analysis above. The calculation methods and results in this paper can provide some referenced information for the engineering design.

Test Research on Behavior and Spatial Finite Element Analysis of Equal Section Catenary Double Empty Arch Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2248-2252
Author(s):  
Zhong Qiang Wang ◽  
Tao Ouyang
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Structural Design ◽  
Calculation Model ◽  
Element Calculation ◽  
Loading Test ◽  
Element Analysis ◽  
Internal Forces ◽  
Arch Bridges ◽  
Calculated Model

Test research on behavior and theoretical analysis were carried out to ensure the in-service safety for the reason of diseases of existing double arch bridges[5]~[6]. Combing with a practical example of Menggong Bridge present situation, the performance was detected and the actual bearing capacity was checked through multi working conditions loading test. The finite element calculated model was established using the software MIDAS to simulated analyze internal forces and deformations. The comparison showed that the calculated result was well agree with experimental data, the structural design was reasonable and the flexural stiffness and bearing capacity were enough. The results also indicated that Menggong Bridge should be reinforced for the diseases, and the test and finite element calculation model were effective and reliable.

Cyclic Loading Test and Numerical Analysis of Flange Joint and Reducer of RHR Piping Systems

2014 ◽  
Author(s):  
Zih-Yu Lai ◽  
Yan-Fang Liu ◽  
Ching-Ching Yu ◽  
Juin-Fu Chai ◽  
Fan-Ru Lin ◽  
...  
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Cyclic Loading ◽  
Nuclear Power ◽  
Numerical Models ◽  
Heat Removal ◽  
Piping System ◽  
Loading Test ◽  
Element Analysis ◽  
Piping Systems

According to the seismic risk assessment results presented in the Final Safety Analysis Report (FSAR) for a nuclear power plant in Taiwan, the failure of Residual Heat Removal (RHR) piping system occurs in both of the two accident sequences with the highest contributions for core damage. The seismic performance of RHR piping system depends on the capacity of its components, such as supports, flanged joints and reducers. For the need of seismic response-history analysis of RHR piping systems, we developed detailed numerical models of flanged joint and reducer using finite element analysis software (ABAQUS and SAP2000). The proposed finite element models were verified by the experimental results. The pure bending tests with four-point cyclic loading were conducted for sample flanged joint and reducer to investigate their mechanical behaviors. The displacement and rotation responses identified from the tests are in good agreement with the results of numerical analysis. A preliminary simplified model of flanged joints was also proposed in this study to improve the efficiency of numerical analysis for RHR piping system.

scholarly journals Finite element analysis of double‐plate fixation using reversed locking compression‐distal femoral plates for Vancouver B1 periprosthetic femoral fractures

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Daisuke Takahashi ◽  
Yoshihiro Noyama ◽  
Tsuyoshi Asano ◽  
Tomohiro Shimizu ◽  
Tohru Irie ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Plate Fixation ◽  
Weight Bearing ◽  
Femoral Fractures ◽  
Full Weight Bearing ◽  
Loading Test ◽  
Lateral Plate ◽  
Element Analysis ◽  
Periprosthetic Femoral Fractures

Abstract Background Internal fixation is recommended for treating Vancouver B1 periprosthetic femoral fractures. Although several fixation procedures have been developed with high fixation stability and union rates, long-term weight-bearing constructs are still lacking. Therefore, the aim of the present study was to evaluate the stability of a double-plate procedure using reversed contralateral locking compression-distal femoral plates for fixation of Vancouver B1 periprosthetic femoral fractures under full weight-bearing. Methods Single- and double-plate fixation procedures for locking compression-distal femoral plates were analysed under an axial load of 1,500 N by finite element analysis and biomechanical loading tests. A vertical loading test was performed to the prosthetic head, and the displacements and strains were calculated based on load-displacement and load-strain curves generated by the static compression tests. Results The finite element analysis revealed that double-plate fixation significantly reduced stress concentration at the lateral plate place on the fracture site. Under full weight-bearing, the maximum von Mises stress in the lateral plate was 268 MPa. On the other hand, the maximum stress in the single-plating method occurred at the defect level of the femur with a maximum stress value of 1,303 MPa. The principal strains of single- and double-plate fixation were 0.63 % and 0.058 %, respectively. Consistently, in the axial loading test, the strain values at a 1,500 N loading of the single- and double-plate fixation methods were 1,274.60 ± 11.53 and 317.33 ± 8.03 (× 10− 6), respectively. Conclusions The present study suggests that dual-plate fixation with reversed locking compression-distal femoral plates may be an excellent treatment procedure for patients with Vancouver B1 fractures, allowing for full weight-bearing in the early postoperative period.

Nonlinear Numerical Analysis of SRC Frame Middle Joints

2013 ◽  
Vol 376 ◽  
pp. 231-235
Author(s):  
Cheng Li ◽  
Yun Zou ◽  
Jie Kong ◽  
Zhi Wei Wan
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Bearing Capacity ◽  
Axial Load ◽  
Load Ratio ◽  
Experimental Results ◽  
Steel Ratio ◽  
Finite Element Software ◽  
Axial Load Ratio ◽  
Hysteretic Performance

Nonlinear numerical analysis for the force performance of frame middle joint is processed in this paper with the finite element software of ABAQUS. Compared with experimental results, numerical analysis results are found to be reasonable. Then the influence of factors such as shaped steel ratio and axial-load ratio are contrastively analyzed. The results show that shaped steel ratio has a greater influence on the bearing capacity and hysteretic performance of the structure, but the axial-load ratio has less influence.

Analysis of Effective Pre-Stress of Continuous Rigid Frame Bridge in Service Based on Inversion Theory

2013 ◽  
Vol 671-674 ◽  
pp. 1012-1015
Author(s):  
Zhao Ning Zhang ◽  
Ke Xing Li
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Inversion Method ◽  
Vertical Deflection ◽  
Continuous Rigid Frame Bridge ◽  
Rigid Frame ◽  
Inversion Theory ◽  
Rigid Frame Bridge ◽  
The Finite Element Model

Due to the environment, climate, loads and other factors, the pre-stress applied to the beam is not a constant. It is important for engineers to track the state of the pre-stress in order to ensure security of the bridge in service. To solve the problem mentioned above, the paper puts forward a new way to analyze the effective pre-stress using the displacement inversion method based on the inversion theory according to the measured vertical deflection of the bridge in service at different time. The method is a feasible way to predict the effective pre-stress of the bridge in service. Lastly, taking the pre-stressed concrete continuous rigid frame bridge for example, the effective pre-stress is analyzed by establishing the finite element model.

With Different Axial Compression, the Finite Element Analysis of Concrete Frame Column that Reinforced by Assemble Inclined Web Steel Truss

2014 ◽  
Vol 1079-1080 ◽  
pp. 177-182
Author(s):  
Shao Wu Zhang ◽  
Ying Chuan Chen ◽  
Geng Biao Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bearing Capacity ◽  
Axial Compression ◽  
Simulation Analysis ◽  
Hysteresis Curve ◽  
Element Analysis ◽  
Concrete Frame ◽  
The Finite Element Analysis ◽  
Steel Truss

In order to study the performance of concrete frame columns that reinforcedby assembleinclined web steel truss, with the same reciprocatinghorizontal displacement and different axialcompression.It canbe calculate the mechanical behavior of concrete frame columns and reinforced columns by using the finite element analysis software ABAQUS. Simulation analysis shows that the bearing capacity ofreinforced columnshas greatly increased andpresented a full hysteresis curve. The result shows that the reinforcement method of assemble inclined web steel truss can greatly improve the bearing capacity and ductility of the concrete frame column, and the axial compression is larger, the better the reinforcement effect.

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