Mechanical Response Analysis of Airport Flexible Pavement Above Underground Infrastructure Under Moving Wheel Load

2017 ◽  
Vol 35 (5) ◽  
pp. 2269-2275 ◽  
Author(s):  
Yue Li ◽  
Ge Song ◽  
Jing Cai
Keyword(s):  
Mechanical Response ◽  
Flexible Pavement ◽  
Response Analysis ◽  
Wheel Load ◽  
Underground Infrastructure

Research of Steel Deck Pavement Suitable Paving Materials

2011 ◽  
Vol 243-249 ◽  
pp. 4092-4096 ◽  
Author(s):  
Yi Wei Weng ◽  
Jyh Dong Lin ◽  
Wei Hsing Huang ◽  
Ming Chin Yeh
Keyword(s):  
Mechanical Response ◽  
Compressive Strain ◽  
Flexible Pavement ◽  
Traditional Theory ◽  
Tire Pressure ◽  
Wheel Load ◽  
Suitable Material ◽  
Pavement Distress ◽  
Asphalt Mix ◽  
Steel Deck

This study utilized mechanical calculation method and finite element method ABAQUS software to analyze the mechanical response of different flexible pavement material combinations on steel deck. Heavy vehicle load with high axle load and high tire pressure were considered, so as to know the reasons for steel deck pavement distress, and to define the arrangement principle for steel deck pavement and the combination of materials suitable for flexible pavement. The results show that the fatigue damage of steel deck pavement coincides with traditional theory, the maximum tensile strain at the bottom of surface course is still the determination index, and the fatigue crack is presented mainly in four types; the maximum compressive strain on the top of steel plate is the determination index of rutting damage, the major cause for rut is the surface course under compressive strain in the wheel load position. The suitable material for steel deck one-course pavement is full depth Guss asphalt mix; the suitable combination for steel deck two-course pavement is modified asphalt mix on top and Guss asphalt mix at bottom.

Mechanical Response Analysis of the Composite Asphalt Pavement

2014 ◽  
Vol 1023 ◽  
pp. 28-31
Author(s):  
Li Min Li
Keyword(s):  
Service Life ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Road Construction ◽  
Pavement Design ◽  
Rigid Base ◽  
Response Analysis ◽  
Early Failure ◽  
Short Service Life ◽  
Design Software

With the constant increasing of traffic flow and axle load, the early failure of semi-rigid base asphalt pavement is increasingly serious in China. The bad durability and short service life of pavement have become main obstacles in road construction development. Based on the experience of successful application, the early failure of semi-rigid base asphalt pavement is solved, and the service life of pavement is increased by using of the composite asphalt pavement. To solve the design problem of the composite asphalt pavement , its mechanical properties influence results of are obtained by the factors, such as shear strain, shear stress, compression strain on top of subgrade, etc, by a lot of calculation using Shell pavement design software. These provide theoretical basis for durable asphalt pavement design based on rut-resistance property.

Influences of Wind Barriers on the Train Running Safety on a Highway-Railway One-Story Bridge

2021 ◽  
pp. 2140009
Author(s):  
Ye Liu ◽  
Yan Han ◽  
Peng Hu ◽  
C. S. Cai ◽  
Xuhui He
Keyword(s):  
Dynamic Responses ◽  
Response Analysis ◽  
Train Track ◽  
Wheel Load ◽  
Wind Barrier ◽  
The Mean ◽  
Wind Pressures ◽  
Track Bridge ◽  
Fluctuating Wind ◽  
Bridge System

In this study, the influences of wind barriers on the aerodynamic characteristics of trains (e.g. a CRH2 train) on a highway-railway one-story bridge were investigated by using wind pressure measurement tests, and a reduction factor of overturning moment coefficients was analyzed for trains under wind barriers. Subsequently, based on a joint simulation employing SIMPACK and ANSYS, a wind–train–track–bridge system coupled vibration model was established, and the safety and comfort indexes of trains on the bridge were studied under different wind barrier parameters. The results show that the mean wind pressures and fluctuating wind pressures on the trains’ surface decrease generally if wind barriers are used. As a result, the dynamic responses of the trains also decrease in the whole process of crossing the bridge. Of particular note, the rate of the wheel load reductions and lateral wheel-axle forces can change from unsafe states to relative safe states due to the wind barriers. The influence of the porosity of the wind barriers on the mean wind pressures and fluctuating wind pressures on the windward sides and near the top corner surfaces of the trains are significantly greater than the influence from the height of the wind barriers. Within a certain range, decreasing the wind barrier porosities and increasing the wind barrier heights will significantly reduce the safety and comfort index values of trains on the bridge. It is found that when the porosity of the wind barrier is 40%, the optimal height of the wind barrier is determined as approximately 3.5[Formula: see text]m. At this height, the trains on the bridges are safer and run more smoothly and comfortably. Besides, through the dynamic response analysis of the wind–train–track–bridge system, it is found that the installation of wind barriers in cases with high wind speeds (30[Formula: see text]m/s) may have an adverse effect on the vertical vibration of the train–track–bridge system.

Flow-Induced Vibration Analysis of a Water Injection System at Elevated Flow Rates of an FPSO

2019 ◽  
Author(s):  
Néstor González Díez ◽  
Juan P. Pontaza ◽  
Oluwaseun M. Awe ◽  
Pieter van Beek ◽  
Can Tümer
Keyword(s):  
Mechanical Response ◽  
Optimization Technique ◽  
Water Injection ◽  
Element Model ◽  
Injection System ◽  
Response Analysis ◽  
Flow Induced Vibration ◽  
Flow Rates ◽  
Screening Analysis ◽  
High Level

Abstract The water injection system of an FPSO active in the Gulf of Guinea is to increase injection capacity to levels that are threatening from a flow-induced vibration perspective, such that hydrocarbon recovery can be accelerated. A three-tier method based on the internal guidelines of the system operator has been employed to assess the level of FIV threat expected from the increase in flow rate. A high-level screening analysis is followed by a more detailed approach, modified in this case by introducing knowledge obtained from field data gathered during a comprehensive measurement campaign aboard the FPSO. In particular, the data has been used to calibrate the finite element model of the mechanical layout of the pipework and associated supporting by making use of an optimization technique. The PSD of the flow excitation has been calibrated to match the measured response of the system, with descriptions of the turbulent excitation introduced in elbows by means of PSD functions available in the open literature. The PSDs, once calibrated, are further scaled to the future flow-rates so that they can be used as input to the mechanical response analysis. Though the high-level screening analysis delivers the conclusion that flow rates should be limited, the detailed analysis proves that the expected vibrations will be acceptable.

Mechanical Response of Asphalt Pavement under Overloading

2013 ◽  
Vol 361-363 ◽  
pp. 1869-1872 ◽  
Author(s):  
Sheng Jie Liu ◽  
Qing Long You
Keyword(s):  
Tensile Stress ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Compressive Strain ◽  
Flexible Pavement ◽  
Load Application ◽  
Rigid Base ◽  
Linear Elastic ◽  
Application Procedure ◽  
Surface Increase

This paper examines theoretically the possible mechanical response changes on both bituminous pavement structure using linear elastic method, the change regulation of deflection,stress on the bottom of base and subbase and compress strain on the top of subgrades between semi-rigid base and flexible pavement pavement. In the load application procedure, a dual wheel with the a series of pressure was chosen.The results have shown that the deflection tensile stress and subgrade compressive strain on the surface increase with the increase of axle load and they would result in serious effect of overloading on the earlier damage of asphalt pavement.

scholarly journals Analisa Rencana Overlay Landas Pacu Bandar Udara Iskandar Pangkalan Bun, Terhadap Equivalent Single Wheel Load (ESWL) Pesawat Boeing 737-900 ER

2019 ◽  
Vol 25 (7) ◽  
pp. 468
Author(s):  
Ataline Muliasari ◽  
M Herry Purnama
Keyword(s):  
Flexible Pavement ◽  
Wheel Load

Bandar udara Iskandar yang terus berupaya meningkatkan kualitas pelayanan penerbangan bagi masyarakat pengguna, berencana melakukan pengembangan fasilitas landas pacu dari 1.850 meter menjadi 2.250 meter. Pemanjangan fasilitas landas pacu sepanjang 350 meter ini diharapkan agar pesawat udara berbadan lebar dapat mendarat di bandar udara Iskandar yang saat ini baru dapat didarati oleh pesawat dengan tipe 737500. Analisa rencana overlay landas pacu bandar udara Iskandar Pangkalan Bun, terhadap Equivalent Single Whell Load (ESWL) pesawat Boeing 737-900ER ini dilakukan dengan tujuan untuk mengetahui ketebalan rencana lapisan perkerasan landas pacu yang akan di overlay terhadap equivalent single wheel load (ESWL) pesawat hoeing 737-900 ER. Sementara itu, perurnusan masalah dari pengkajian ini adalah apakah rencana tebal perkerasan overlay fasilitas landas pacu di Bandar Udara Pangkalan Bun telah memenuhi persyaratan untuk dapat didarati pesawat tipe Boeing 737-900 ER. Bandar Udara Iskandar pangkalan Bun akan melakukan overlay setebal 7,5 cm. sehingga flexible pavement yang semula setebal 80 cm akan menjadi setebal 87,5 cm. tetapi, dari hasil perhitungan terlihat bahwa tebal pavement minimal adalah 88 cm. oleh sebab itu terdapat selisih tebal lapisan perkerasan hasil perhitungan dengan rencana sebesar 0.25 cm.

Sign in / Sign up

Export Citation Format

Share Document