Dynamic Response in ALF Aggregate Base Asphalt Pavement

2011 ◽  
Vol 97-98 ◽  
pp. 40-44 ◽  
Author(s):  
Chuan Yi Zhuang ◽  
Ai Qin Shen ◽  
Lin Wang
Keyword(s):  
Dynamic Response ◽  
Compressive Stress ◽  
Asphalt Pavement ◽  
Compressive Strain ◽  
Full Scale ◽  
Dynamic Responses ◽  
Traffic Load ◽  
Dynamic Strain ◽  
Strain Response ◽  
Soil Pressure

In order to evaluate pavement dynamic responses accurately under truck loading, the full-scale asphalt pavement accelerated loading facility (ALF) was used. 10 strain gauges and 2 soil pressure cells were installed; temperature sensors were also installed in the different depth of the HMA layer. Pavement response was measured under real traffic load with ALF. The measured pavement responses are compared between the pavement sections to evaluate the effects of various experimental factors, such as axle load, speed, et al. Dynamic strain at the bottom of HMA layer and vertical compressive stress on the top of the subgrade were examined in the full-scale testing road, the regression models between dynamic response and axle load, dynamic response and speed were put forward respectively. Studies show that there is not only tensile strain but also compressive strain in the dynamic response, and the strain response is in the station of tension and compression alternation. Under the intermediate temperature, the strain response at the bottom of the asphalt layer is increased linearly with the increase of axle load and the vertical compressive stresses at the top of the subgrade is also increased with the increase of axle load. Speed has a great effect on strain response at the bottom of HMA layer, and has little effect on vertical compressive stress, it affects the loading duration of stress only. The destroy for the pavement by low speed and heavy load is more serious than that is normal.

Experiment Study on Dynamic Response of Rough AC Surface under Vehicle

2011 ◽  
Vol 243-249 ◽  
pp. 4366-4372
Author(s):  
Guang Hai Zhang ◽  
Hai Gui Kang ◽  
Yuan Xun Zheng
Keyword(s):  
Service Life ◽  
Dynamic Response ◽  
Structural Design ◽  
Asphalt Pavement ◽  
Road Surface ◽  
Dynamic Responses ◽  
Experiment Study ◽  
Asphalt Road

In order to study dynamic response of rough road surface resulting from different speeds and loads under a certain roughness for purpose of effective enhancement pertinence for structural design of an asphalt pavement and extension of its service life, displacement meters, stress meters and strain meters are embedded at different structural layers on the rough road surface to monitor the dynamic responses of AC pavement. The result shows that roughness can dramatically increase response on an asphalt road surface resulting from load and speed.

scholarly journals Experiment and Numerical Simulation of the Dynamic Response of Bridges under Vibratory Compaction of Bridge Deck Asphalt Pavement

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
An-Ping Peng ◽  
Han-Cheng Dan ◽  
Dong Yang
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Field Experiments ◽  
Bridge Deck ◽  
Asphalt Pavement ◽  
Dynamic Responses ◽  
Structural Safety ◽  
Cross Sectional ◽  
Bridge Structures ◽  
Vibratory Compaction

Vibratory compaction of bridge deck pavement impacts the structural integrity of bridges to certain degrees. In this study, we analyzed the dynamic response of different types of concrete-beam bridges (continuous beam and simply supported beam) with different cross-sectional designs (T-beam and hollow-slab beam) under vibratory compaction of bridge deck asphalt pavement. The dynamic response patterns of the dynamic deformation and acceleration of bridges under pavement compaction were obtained by performing a series of field experiments and a three-dimensional finite element simulation. Based on the finite element model, the dynamic responses of bridge structures with different spans and cross-sectional designs under different working conditions of vibratory compaction were analyzed. The use of different vibration parameters for different bridge structures was proposed to safeguard their structural safety and reliability.

Testing and Statistics Analysis on Dynamic Response of Expressway Bridge under Various Vehicles

2011 ◽  
Vol 90-93 ◽  
pp. 1033-1038
Author(s):  
Tao Wang ◽  
Wan Shui Han ◽  
Yan Wei Li
Keyword(s):  
Dynamic Response ◽  
Rapid Development ◽  
Bridge Engineering ◽  
Dynamic Responses ◽  
Critical Parameters ◽  
Dynamic Strain ◽  
Coupling Vibration ◽  
Vehicle Type ◽  
Traffic Lane ◽  
Video Recorder

Nowadays, with the rapid development of the traffic infrastructure construction and the growing of the traffic flowing and speed, the vehicle-bridge coupling vibration research has become the focus of the bridge engineering study. The dynamic response of the bridge under the traffic flowing is one of the vital parameters for the vehicle-bridge coupling vibration analysis. In this paper, a methodology, employing the speed radar gun, the video recorder, and the dynamic strain tester in combination with manually recording is used to continuously and detailed investigate the traffic loads on the expressway bridge within 24 hours a day. With this approach introduced by this paper, all the critical parameters, such as the vehicle type, speed, traffic lane, the arriving time of the traffic and the bridge-vehicle dynamic interaction are all recorded. In this investigation, firstly the dynamic responses of 8 pieces of girders of the bridge under 5650 individual vehicles driving through the bridge are recorded, then in conjunction with the investigated traffic flowing samples, in terms of the vehicle type, some detailed statistics study is conducted on the collected records, and finally the space-time distribution laws of the dynamic response of the bridge under the traffic flowing are studied extensively. The result of this study could provide helpful theoretic guidance and supporting data for the vehicle-bridge coupling vibration research.

scholarly journals Influence of Fluid Viscous Damper on the Dynamic Response of Suspension Bridge under Random Traffic Load

2020 ◽  
Vol 2020 ◽  
pp. 1-19
Author(s):  
Yue Zhao ◽  
Pingming Huang ◽  
Guanxu Long ◽  
Yangguang Yuan ◽  
Yamin Sun
Keyword(s):  
Dynamic Response ◽  
Traffic Flow ◽  
High Intensity ◽  
Bending Moment ◽  
Suspension Bridge ◽  
Dynamic Responses ◽  
Traffic Load ◽  
Damping Coefficient ◽  
Suspension Bridges ◽  
Fluid Viscous Dampers

Fluid viscous dampers (FVDs) are widely used in long-span suspension bridges for earthquake resistance. To analyze efficiently the influences of FVDs on the dynamic response of a suspension bridge under high-intensity traffic flow, a bridge-vehicle coupling method optimized by isoparametric mapping and improved binary search in this work was first developed and validated. Afterwards, the traffic flow was simulated on the basis of monitored weigh-in-motion data. The dynamic responses of bridge were analyzed by the proposed method under different FVD parameters. Results showed that FVDs could positively affect bridge dynamic response under traffic flow. The maximum accumulative longitudinal girder displacement, longitudinal girder displacement, and longitudinal pylon acceleration decreased substantially, whereas the midspan girder bending moment, pylon bending moment, longitudinal pylon displacement, and suspender force were less affected. The control efficiency of maximum longitudinal girder displacement and accumulative girder displacement reached 33.67% and 57.71%, longitudinal pylon acceleration and girder bending moment reached 31.51% and 7.14%, and the pylon longitudinal displacement, pylon bending moment, and suspender force were less than 3%. The increased damping coefficient and decreased velocity exponent can reduce the bridge dynamic response. However, when the velocity exponent was 0.1, an excessive damping coefficient brought little improvement and may lead to high-intensity work under traffic flow, which will adversely affect component durability. The benefits of low velocity exponent also reduced when the damping coefficient was high enough, so if the velocity exponent has to be increased, the damping coefficient can be enlarged to fit with the velocity exponent. The installation of FVDs influences dynamic responses of bridge structures in daily operations and this issue warrants investigation. Thus, traffic load should be considered in FVD design because structural responses are perceptibly influenced by FVD parameters.

Statistics Analysis of the Bridge Dynamic Response in the Survey of Expressway Traffic Loads

2011 ◽  
Vol 250-253 ◽  
pp. 1633-1637
Author(s):  
Tao Wang ◽  
Wan Shui Han
Keyword(s):  
Dynamic Response ◽  
Rapid Development ◽  
Bridge Engineering ◽  
Dynamic Responses ◽  
Critical Parameters ◽  
Dynamic Strain ◽  
Statistics Analysis ◽  
Coupling Vibration ◽  
Traffic Lane ◽  
Traffic Loads

Nowadays, with the rapid development of the traffic infrastructure construction and the growing of the traffic flowing and speed, the vehicle-bridge coupling vibration research has become the focus of the bridge engineering study. The dynamic response of the bridge under the traffic flowing is one of vital parameters for the vehicle-bridge coupling vibration analysis. In this paper, a methodology, employing the radar speed gun, the video recorder, and the dynamic strain tester in combination with manually recording is used to continuously and detailed investigate the traffic loads on the expressway bridge within 24 hours a day. With this approach introduced by this paper, all the critical parameters, such as the vehicle type, speed, traffic lane, the arriving time of the traffic and the bridge-vehicle dynamic interaction are all recorded. In this investigation, firstly the dynamic responses of 8 pieces of beams of the bridge under 5650 individual vehicles driving through the bridge are recorded, secondly statistics analysis are made for the record of each beam, and finally the space-time distribution laws of the dynamic response of the bridge under the traffic flowing are studied extensively. The result of this study could provide helpful theoretic guidance and supporting data for the vehicle-bridge coupling vibration research.

scholarly journals Monitoring of Dynamic Strain Response in Concrete Structure Based on Piezoelectric Sensors

2017 ◽  
Vol 11 (1) ◽  
pp. 992-1002
Author(s):  
Lei Qin ◽  
Enrong Wang ◽  
Qi Qin ◽  
Taochun Yang ◽  
Feng Gao
Keyword(s):  
Dynamic Response ◽  
Cantilever Beam ◽  
Concrete Structure ◽  
Linear Response ◽  
Dynamic Properties ◽  
Piezoelectric Sensors ◽  
Embedded Sensors ◽  
Dynamic Strain ◽  
Strain Response ◽  
Concrete Frame

Background: In this study, piezoelectric sensors were embedded into concrete structures to monitor dynamic response. The embedded piezoelectric sensors had sensitive frequency and linear response. Objective: In the experiment, two loading conditions were applied to the concrete cantilever beam and concrete frame. The dynamic properties could be monitored using the embedded sensors and the damage could also be identified.

scholarly journals The influence of accessory rods and connectors on the dynamic response of spine fixation

2021 ◽  
Author(s):  
Mahmut Pekedis ◽  
Murat Altan ◽  
Turgut Akgul ◽  
Hasan Yildiz
Keyword(s):  
Dynamic Response ◽  
Dynamic Responses ◽  
Dynamic Strain ◽  
Nondestructive Technique ◽  
Lateral Direction ◽  
Group I ◽  
Flexion Extension ◽  
Anterior Corpectomy ◽  
Band Limited ◽  
Spine Fixation

Abstract Purpose This study presents a nondestructive technique to assess the influence of accessory rods and connectors on the dynamic response of spine fixation.Methods Eighteen spine specimens were divided into three construct groups such as group I (2 rods [2R]), II (2 primary rods + 2 accessory rods with 2 transverse connectors [4R+2TC]) and III (2 primary rods + 2 accessory rods with 4 transverse connectors [4R+4TC]). Anterior corpectomy was performed for all specimens. A custom test setup was built to assess the dynamic responses of constructs in flexion-extension (FE) and left-right lateral bending (LRLB) motions. This setup can slide in lateral direction, and it is excited with an electrodynamic shaker vibrated at band limited random frequencies. Accelerometer and reusable dynamic strain sensors were installed on constructs to monitor the dynamic responses. Quasi-static eccentric loading tests were performed to determine the range of motion (RoM).Results The results demonstrated that accessory rods significantly increase the resonance frequency (RF) and decrease the strain over standard 2R construction. Although 4R+4TC provided greatest reduction in rod strain over 4R+2TC and 2R, additional 2 connectors have no significant influence on dynamic response in FE motion.Conclusions An increase in the number of rods has a significant role on the improvement of the fixation's integrity in FE and LRLB motions. However, the additional transverse connectors have significant involvements only in LRLB motion. RF obtained from dynamic tests correlated with the RoM which indicates that the technique could be used as an addendum to the quasi-static test.

Comparison of Full-Scale and Numerical Model Dynamic Responses of Norströmsgrund Lighthouse

2014 ◽  
Author(s):  
Wojciech Popko
Keyword(s):  
Numerical Model ◽  
Dynamic Response ◽  
Measurement Data ◽  
Structural Response ◽  
Full Scale ◽  
Dynamic Responses ◽  
Soil Stiffness ◽  
Time Histories ◽  
3D Numerical Model ◽  
Abaqus Software

This paper compares dynamic response of the Norströmsgrund lighthouse and its numerical implementation in Abaqus software. The dynamic response of the full-scale structure was analyzed based on the accelerometers data, which were correlated with ice loading time histories that were recorded from the load panels surrounding the structure. The full-scale measurement data come from the Measurements on Structures in Ice (STRICE) project. A 3D numerical model of the lighthouse, based on the solid elements was setup in Abaqus. Such aspects as soil stiffness and sand filling of caissons were accounted for to more accurately mimic behavior of the real structure. The eigen-frequency response of the numerical model was tuned to correspond with the structural response of the full-scale lighthouse. The numerical model was equipped with a set of load panels on which pre-defined time histories of the full-scale loading were applied. Then, its response was compared with the response of the Norströmsgrund lighthouse.

scholarly journals Dynamic Response Analysis of a Semi-Submersible Floating Wind Turbine in Combined Wave and Current Conditions Using Advanced Hydrodynamic Models

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5820 ◽  
Author(s):  
Takeshi Ishihara ◽  
Yuliang Liu
Keyword(s):  
Dynamic Response ◽  
Wind Turbine ◽  
Wave Spectrum ◽  
Full Scale ◽  
Dynamic Responses ◽  
Offshore Wind Turbine ◽  
Response Analysis ◽  
Water Tank ◽  
Hydrodynamic Models ◽  
Wide Range

In this study, advanced hydrodynamic models are proposed to predict dynamic response of a floating offshore wind turbine (FOWT) in combined wave and current conditions and validated by laboratory and full-scale semi-submersible platforms. Firstly, hydrodynamic coefficient models are introduced to evaluate the added mass and drag coefficients in a wide range of Reynolds numbers. An advanced hydrodynamic model is then proposed to calculate the drag force of cylinder in combined wave and current conditions. The proposed model is validated by the water tank tests in the current-only, wave-only and current-wave conditions and is used to investigate the effect of current on the dynamic response of FOWT. Finally, the full-scale semi-submersible platform used in the Fukushima demonstration project is investigated. It is found that the predicted dynamic responses of platform by the proposed hydrodynamic models are improved by the directional spreading function of the sea wave spectrum and show favorable agreement with the field measurement.

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