Jozef Grajek, P.Eng. Author, MASCE, Author, Principal Consultant /Senior Airport Engineer EJG Aviation, firstname.lastname@example.org Joanna Grajek, Vice-President ,Co-Author EJG Aviation,email@example.com
“Air Traffic Pavements Structural Analysis and Design.”
After the aircraft starts its engines, it generally must taxi along the taxiways to a runway and then travel along the runway during its take-off run. Dynamic interaction between the runway and the aircraft landing gears together with atmospheric thermal effects are a source of high dynamic and static overloads affecting strength and durability of the runway upper layers. All structures deform under the action of applied loads. Time-varying deflections import accelerations to the structure. All layers of airfield pavement structures impacted by loads. Finite elements analysis provides the forces and stresses as well as the deformation of a structural layers under the loading conditions (phase of operation, section of the runway, taxiway, rapid exit or apron). On for finite element analysis consists of the geometry of the layers, mechanical properties of the materials, description of the subgrade as a foundation and applied loads. Runways and taxiways are equipped with specific devices installed into the top layers and for the runway high category there are several hundreds of them. Each single device is provided with underground power and communication connections located in the subgrade. In this paper Authors selected the two type of rigid pavement structures for large aircraft loads and large airport. Model formulation of the runway centerline slabs with operational devices breaks the problem down and formulates it mathematically.
“Airfield Pavements Performance in Arctic Conditions".
Many States continue to be interested in Arctic region to advance its leadership, economic agenda and substantial investments.” Aviation is working backwards; airports and airfield pavements must be prepared in advance.” The development of various kinds of modern technology, like of composite layered materials, prefabricated panels become more and more important. This makes a strong need for simplified but reliable models of systems in order to improve the safety of aircraft operations. The main criteria to be satisfied in the design and construction of airfield pavements are generally those of ensuring that pavement is strong enough to support all type of loads imposed by the aircraft and all other loads without deforming surface and satisfy structural integrity. This paper describes three cases of heavy aircraft loads on runway during the landing and takeoff operations at permanent, seasonal and temporary aerodromes. Two types of prefabricated airfield pavement structure are considered for engineering applications. As a result of the Arctic geographic locations the possible sites are under continuous permafrost. Daily and seasonal changes in temperature have been analysed. Mathematical/Numerical model solution presented including special case of impact of the aircraft wheel on the surface caused by vertical unevenness.
Key Words: Airfield, Arctic Runway
THEORY AND PRACTICE PART 511 August 27,2020
Joanna and Jozef Grajek, www.ejgaviation.com
18 Years Performance Concrete Overlay
18 years Performance Exposed Concrete
18 Years Performance Pavement Monitoring
Further to discussion and previous papers, the following is to
provide you with more details of The Pilot Project , Unbonded
Concrete Overlay, Full Depth Concrete Road and Monitoring.
During construction strain gauges to measure load distribution and transfers
were installed. This work required special ducts construction, wiring
for the individual sensors, sensors set up, construction of secured central box
for digital panels, solar power supply system and phone monitoring system.
Construction was performed from June 27, 2003 t0 August 4, 2003.
To be continued
THEORY and PRACTICE PART 310,August 2020
Joanna and Jozef Grajek, www.ejgaviation.com
SOIL IS THE FOUNDATION
Written by Jozef Grajek,P.Eng., 2018 ,Washington DC.
"Without exaggeration it can be argued that of all buildings the most
connected to soil are roads and airfield pavements, because the foundation
of roads is always soil, intermediate layer transferring external forces to
the foundation almost always there is a soil and often the soil is also
material and surface. Despite such repeated use of soil in road and
airfield pavements construction, we are still facing problems which
we are trying to solve through engineering practice and scientific research."