THEORY and PRACTICE, September 15, 2020
PART 516
2021 ASCE TDI Conference, Abstract Submission
Jozef Grajek, P.Eng. Author, MASCE, Author,
Principal Consultant /Senior Airport Engineer
EJG Aviation,
jgrajek@ejgaviation.com
Joanna Grajek, Vice-President ,Co-Author EJG Aviation,jgrajek@ejgaviation.com
“Air Traffic Pavements Structural Analysis and Design.”
ABSTRACT
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.
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THEORY and PRACTICE,August 2020
PART 515 COLD REGIONS ,ARCTIC
Abstract 2021 ASCE RCOP ICCRE Conference
Jozef Grajek, P.Eng.,MASCE,Author Principal Consultant /Senior Airport Engineer EJG Aviation, jgrajek@ejgaviation.com
Joanna Grajek ,Co-Author,Vice-President EJG Aviation, jgrajek@ejgaviation.com
“Airfield Pavements Performance in Arctic Conditions".
ABSTRACT
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
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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.
Pavement 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
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THEORY and PRACTICE PART 310,August 2020
Joanna and Jozef Grajek, www.ejgaviation.com
SOIL IS THE FOUNDATION
SUBGRADE
BASE
SUBBASE
MATERIALS, GRANULARS
DESIGN INPUT
PERMAFROST
AIRPORT SPECIFICATIONS
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."
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TECHNICAL LIFE NEWS
GALLERY- June 20,2020
Joanna and Jozef Grajek
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SPECIAL NOTE
Joanna and Jozef Grajek, March 26,2020
COVID -19(coronavirus) has introduced sudden and exceptional changes
to our businesses, operating environments and our lives over
the past few weeks. We recognize that some of these changes
have created significant impacts for our clients and our
professional services.
We are understanding our profession and essential engineering
services, our obligations under the Code of Ethics, which include,
among other requirements, the duty to hold paramount the safety,
health, and safety in the workplace.
Action issues are:
Health and safety responsibilities for family, employers
and professionals
Signing, sealing and submitting documents remotely
Conducting field reviews and other professional activities
that may not support proper social distance.
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THEORY and PRACTICE , PART 415, February 2020
Joanna,Jozef Grajek, www.ejgaviation.com
People, Economics,Nature,Technology
PROGRAM /PROJECT MANAGEMENT
RISK- WHEN YOUR PROJECT IS IN TROUBLE?
• Schedule Delays and Cost Rising
• Substantial Rework and Omissions
• Claims Growing
• Ethical Problems
• Program Structure
• Project Organizational Structure (Risk Management, Project Team..)
• Contractual Structures (Risk Control,…)
• Finance and Authority (Budget, Decision Making, …)
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THEORY and PRACTICE, PART 400, February,2020
Joanna and Jozef Grajek
Airport Engineering
Airfield Pavements Design and Evaluation
ACN/PCN Arcraft/Pavement Rating System
Sample-Inside the runway
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THEORY and PRACTICE PART 300,January 2020
Joanna and Jozef Grajek, www.ejgaviation.com
SOIL IS THE FOUNDATION
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.
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