scholarly journals Dynamic load test and lateral load distribution of a modified rigid frame bridge

2021 ◽  
Vol 233 ◽  
pp. 03026
Author(s):  
NING Yu-feng ◽  
YANG Qing-cheng ◽  
SUN Wei-wei ◽  
CHEN Shun-chao
Keyword(s):  
Dynamic Load ◽  
Load Distribution ◽  
Load Test ◽  
Transverse Load ◽  
Main Beam ◽  
Bridge Structure ◽  
Rigid Frame ◽  
Dynamic Load Test ◽  
Impact Coefficient ◽  
Rigid Frame Bridge

In order to evaluate the stress state and working performance of a rigid frame bridge after reconstruction and extension, load test and transverse load distribution were carried out. Static load test is the test of stress at each section of main beam under the action of partial load and medium load. Dynamic load test is used to test the inherent fundamental frequency, damping ratio and impact coefficient of the bridge through pulsation test and sports car test. The results show that the first order vibration of the bridge is mainly transverse vibration from the measured modal parameters, which is consistent with the characteristics of higher pier and greater flexibility. The vibration characteristics of the bridge structure are low frequency and small damping vibration, the value of which belongs to the normal range among similar bridge structures, the overall stiffness of the bridge structure is normal, and the measured impact coefficient during the test of sports car is less than the design impact coefficient, indicating that the dynamic stiffness of the bridge meets the design and specification requirements.

scholarly journals Research on the evaluation method of bearing capacity of existing Bridges based on dynamic load test

2021 ◽  
Vol 233 ◽  
pp. 03020
Author(s):  
Qingcheng Yang ◽  
Yufeng Ning ◽  
Weiwei Sun ◽  
Shunchao Cheng
Keyword(s):  
Bearing Capacity ◽  
Dynamic Load ◽  
Prestressed Concrete ◽  
Evaluation Method ◽  
Load Level ◽  
Load Test ◽  
Dynamic Strain ◽  
Rigid Frame ◽  
Dynamic Load Test ◽  
Impact Coefficient

The author carried out dynamic load test research on a prestressed concrete rigid frame bridge. Under dynamic load, the ratios of the measured and theoretical frequencies of the first four vertical vibrations of the bridge were 1.081, 1.153 respectively. The corresponding measured damping ratios are 0.011, 0.010 respectively. The maximum dynamic coefficient of bridge sports car test is 1.049, and the corresponding dynamic strain increment coefficient is 0.059. The measured impact coefficient is between 0.012 and 0.049, which is basically equivalent to the design impact coefficient of 0.05.The test results show that the existing bridge works well under the test load, and the bearing capacity of the structure meets the requirements of the design load level.

Investigation of Dynamic Load Test of an Existed Reinforced Concrete Rigid-Frame Arch Bridge

2012 ◽  
Vol 178-181 ◽  
pp. 2121-2124
Author(s):  
Tian Liang ◽  
Jun Dong ◽  
Liang Liang Yang ◽  
Dong Hai Yan
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Load ◽  
Fem Analysis ◽  
Load Test ◽  
Dynamic Responses ◽  
Arch Bridge ◽  
Rigid Frame ◽  
Dynamic Load Test ◽  
Impact Coefficient ◽  
Reconstruction Project

For an existed reinforced concrete rigid-frame arch bridge in reconstruction project, reinforcement effects of the bridge are studied and discussed while the original load grades are maintaining and it is based on dynamic load test including scheme, execution and FEM analysis in this paper. In our investigations, such characteristics as dynamic flexibility, impact coefficient, natural vibrations and dynamic responses are analyzed. All the investigations show that the bridge meets the original-designed-loading requirement, which behaves well in dynamic characteristics after being strengthened and whose stiffness also satisfies requirement.

COMPARISON BETWEEN STATIC AND DYNAMIC LOAD TEST APPLIED TO A STEEL-CONCRETE MIXED BRIDGE STRUCTURE

2017 ◽  
Author(s):  
Maíra Rolla Campos ◽  
Clarissa Rafaela Pinto ◽  
Cláudio José Martins
Keyword(s):  
Dynamic Load ◽  
Load Test ◽  
Bridge Structure ◽  
Dynamic Load Test

Application of Dynamic Load Test in the Bridge Detection

2013 ◽  
Vol 859 ◽  
pp. 218-221
Author(s):  
Tian Ming Miao ◽  
Ying Zhou
Keyword(s):  
Damping Ratio ◽  
Load Test ◽  
Bridge Structure ◽  
Dynamic Impact ◽  
Fluctuation Test ◽  
Test Parameters ◽  
Dynamic Load Test ◽  
Impact Coefficient ◽  
Deflection Test

This practice mainly uses the analysis research on the dynamic characteristics of bridge structure fluctuation test, determination of natural frequency, damping ratio, mode of vibration of bridge structure, dynamic impact coefficient, response (acceleration, dynamic deflection) test parameters, thus judging the whole bridge structure stiffness, operating performance.

Study on Detection Method of Bridge Structure Based on Quasi-Static Test

2014 ◽  
Vol 501-504 ◽  
pp. 1148-1151
Author(s):  
Chun Heng Feng ◽  
Yan Gao ◽  
Xi Sha Jin ◽  
Xing Na Shi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Load ◽  
Static Load ◽  
Element Model ◽  
Load Test ◽  
Bridge Structure ◽  
Static Load Test ◽  
Static Test ◽  
Dynamic Load Test

Currently the bridge structure detections are mainly based on static load test and dynamic load test. The static load test has shortcomings of less test data, long time-consumption and high cost. However, the dynamic load test has the advantages of quick and convenient, its related technologies and theories are still not mature enough. To solve this problem, the detection of bridge structure based on quasi-static test is proposed in this paper. Quasi-static load is applied on the structure by moving the standard load vehicle slowly. Then create the structural finite element model and modify the model according to the measured data to make it consistent with the actual structure. The bridge actual structural mechanical properties can be acquired by conducting load test on the optimized structural finite element model. By doing this, the bridge safety could be evaluated quickly.

scholarly journals Dynamic load test and load lateral distribution of box girder bridge in mining area under special load

2019 ◽  
Vol 136 ◽  
pp. 04064
Author(s):  
Shengtao Yuan ◽  
Weilong Zheng ◽  
Shunchao Chen ◽  
Chuanwen Hu ◽  
Wenbo Luo ◽  
...  
Keyword(s):  
Dynamic Load ◽  
Damping Ratio ◽  
Mining Area ◽  
Lateral Distribution ◽  
Load Test ◽  
Natural Vibration Frequency ◽  
Box Girder ◽  
Dynamic Load Test ◽  
Impact Coefficient ◽  
Girder Bridge

Dynamic load test of bridge is one of the important indexes to evaluate bridge operation and bearing capacity, however, the test of the lateral distribution of bridge is one of the important means to evaluate the state of bridge. In order to evaluate the stress condition and working performance of a box girder bridge in a mining area under the special load of 100T, dynamic load test and lateral load distribution are studied, dynamic load test is to test the natural vibration frequency damping ratio and impact coefficient of the bridge through pulsating test and traffic running test, the transverse distribution of load is analyzed by deflection method and the experimental value of transverse distribution coefficient is compared with the theoretical value of girder method. The results show that under dynamic load, the first vertical natural vibration frequency of the bridge is 10.986, the damping ratio is 0.015%, and the impact coefficient is 1.07~1.26, the vertical measured fundamental frequency is larger than the calculated fundamental frequency, and the overall stiffness of the bridge meets with the design specification; the transverse connection among the box girders is close and the lateral distribution of load meets with the requirement of the design specification.

Static and Dynamic Test Detection of Steel Tube Truss Arch Bridge

2012 ◽  
Vol 178-181 ◽  
pp. 2513-2520
Author(s):  
Xiao Li Li ◽  
Zong Guang Sun ◽  
Ying Fang Fan
Keyword(s):  
Natural Frequency ◽  
Dynamic Load ◽  
Dynamic Test ◽  
Steel Tube ◽  
Load Test ◽  
Measuring Point ◽  
Test Load ◽  
Dynamic Load Test ◽  
Impact Coefficient ◽  
Control Section

Static and dynamic test of 85m span half-through steel tube concrete truss arch were in. Follow contents were determined in the static test:control section deflection of steel tube concrete arch rib under test load;deck control section deflection and strain measuring in test load;deflection and strain measuring of suspender beam;strain test of suspender;crack observation of beam in loading. The deflection and strain measuring point of deck control section were on the beam. The content of dynamic load test :the measuring of impact coefficient、natural frequency and cable tension by frequency methods. Finally, operational situation of bridge was estimated.

Diagnostics of an Existing Cable-Stayed Bridge by Means of the Dynamic Load Test

2015 ◽  
Vol 769 ◽  
pp. 200-205 ◽  
Author(s):  
Michal Polak ◽  
Petr Fajman ◽  
Jiri Maca ◽  
Tomáš Plachý
Keyword(s):  
Dynamic Load ◽  
Dynamic Behaviour ◽  
Load Test ◽  
Diagnostic Methods ◽  
Actual State ◽  
Bridge Structure ◽  
Structural Element ◽  
Cable Stayed Bridge ◽  
Dynamic Load Test ◽  
Bridge Reconstruction

The cable-stayed bridge at the inner ring road in Prague in the Czech Republic was put into operation in 1997. In 2008 a crack was found in the bridge structure area where the end beam was connected with the upper deck of the box section and where the bridge expansion joint system was anchored. The basic objective of diagnostic works, which were started immediately after the finding of the crack, was obtaining the basis for bridge structure modifications, among other things, to prevent formation of similar damages in the future. A series of diagnostic methods was used for determination of the bridge actual state and the real static and dynamic bridge behavior. One of these methods was the dynamic load test. It was focused on an examination of the bridge forced vibration which was caused by dynamic effects of a usual traffic flow. An arrangement of the test was not quite usual because the experiment was concentrated on dynamic behaviour of bridge support areas especially. The abutment area, the pylon area and the area of a pillar with the bearing with a tensile structural element were observed on the investigated bridge. The dynamic load test was performed in two stages. The first stage was focused on investigation of bridge dynamic behaviour in original structural conditions and on obtaining the basis for design of bridge adjustments. The second stage was realized after bridge reconstruction in December 2012 and verified the effectiveness of bridge modifications.

Damage Monitoring and Field Analysis of Dynamic Responses of Ha Shuang Prestressed Concrete Box Girder Oblique Bridge before Strengthening

2011 ◽  
Vol 255-260 ◽  
pp. 1102-1106
Author(s):  
Ali Fadhil Naser ◽  
Zong Lin Wang
Keyword(s):  
Natural Frequency ◽  
Dynamic Load ◽  
Prestressed Concrete ◽  
Load Test ◽  
Dynamic Responses ◽  
Bridge Structure ◽  
Box Girder ◽  
Dynamic Load Test ◽  
Concrete Box Girder ◽  
The Web

Ha Shuang Bridge is located in Harbin city within Heilongjiang province in the east north of China. The purposes of this study are to monitor the damage in structural members of Ha Shuang prestressed concrete box girder oblique bridge before strengthening and to evaluate the dynamic performance of the bridge structure by adopting dynamic load test. Monitoring process of damage of the bridge structure shows that the web of box girder in the quarter of the second span (about 10.5m from the pier) suffers from serious shear cracks. These cracks extend from the top to lower flange of box girder. The width of cracks rang from 0.5mm to 2mm and the angle is 45 degree. There are 6 bending cracks. The spacing between these cracks rang from 20cm to 30cm and the width is 035mm. In the span No. 3 near the pier, the web of box girder appears 12 diagonal cracks have width rang from 0.1mm to 0.12 mm. The results of dynamic load test analysis show that the values of measured vertical natural frequency is w1 = 3.616Hz and horizontal natural frequency w2 = 4.492Hz less than the values of theoretical natural frequency which is 3.863Hz and 4.848Hz, indicating that the actual stiffness of the bridge structure is less than the theoretical stiffness. Therefore the dynamic working state of bridge structure is not good. Therefore the working state of bridge is not good and it need to repair and strengthening.

Inspection and Evaluation of Load-Bearing Capacity of Single Tower Composite Girder Cable-Stayed Bridge

2012 ◽  
Vol 538-541 ◽  
pp. 1785-1788
Author(s):  
Xie Dong Zhang ◽  
Jin Zhi Wang ◽  
Jun Feng Guo
Keyword(s):  
Bearing Capacity ◽  
Dynamic Load ◽  
Static Load ◽  
Load Test ◽  
Bridge Structure ◽  
Static Load Test ◽  
Test Measure ◽  
Cable Stayed Bridge ◽  
Composite Girder ◽  
Dynamic Load Test

In order to evaluate single tower composite girder Cable Bridge actual bearing capacity and working property on design using load, a single-tower composite girder cable-stayed bridge is taken as an example, by means of static load test, dynamic load test, reasonably measures evaluates the single tower composite girder cable-stayed bridge's bearing capacity. The static load test measure static properties of bridge structure (static strain, static deflection, etc.), dynamic load test, measure the dynamic properties of bridge structure (vibration frequency, damping, forced vibration amplitude, impact coefficient, etc.). Results show that the rigidity strength integrity and dynamic characteristics of bridge structure are favorable; the structure’s bearing capacity is favorable.

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