Design of Flexible Airfield Pavements for Multiple-Wheel Landing Gear Assemblies. Report Number 1. Test Section with Lean Clay Subgrade

Design of Flexible Airfield Pavements for Multiple-Wheel Landing Gear Assemblies. Report Number 1. Test Section with Lean Clay Subgrade PDF

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Published: 1952

Total Pages: 89

ISBN-13:

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The traffic tests and associated studies reported herein were performed for the purpose of developing methods for designing flexible pavements to accommodate the multiple-wheel assemblies of heavy planes. Traffic was applied to a test section, constructed of a medium-strength lean clay, with wheel assemblies simulating those of the B-29, B-50, and B-36 planes. The B-29 assembly was loaded to 70,000 lb (35,000 lb per wheel), the B-50 assembly to 100,000 lb. (50,000 lb per wheel), and the B-36 assembly to 150,000 and 200,000 lb (37,500 and 50,000 lb per wheel, respectively). Deflection measurements and other data on the behavior of the test section under traffic were obtained. Test results indicate that multiple-wheel design criteria developed by theoretical methods from already established single-wheel curves are reasonably correct for this test section, but are slightly on the unsafe side.

Multiple-wheel Heavy Gear Load Pavement Tests

Multiple-wheel Heavy Gear Load Pavement Tests PDF

Author:

Publisher:

Published: 1971

Total Pages: 236

ISBN-13:

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Flexible and rigid pavements were constructed and tested to obtain data on pavement and soil behavior under large aircraft loadings for use in developing criteria for evaluating and designing airfield pavements subjected to multiple-wheel heavy gear loads (WMHGL). The test sections incorporated instrumentation systems designed to determine the response of the pavement structures to static, dynamic (slowly moving), and vibratory loads and to traffic by full prototype loadings of a 12-wheel assembly (one main gear of a C-5A aircraft), a twin-tandem assembly (one twin-tandem component of the Boeing 747 assembly), and a single wheel. Analysis of static load response data from the flexible pavement instrumentation program resulted in the establishment of maximum elastic deflection and vertical elastic stress versus depth curves. Comparisons showed that the same relationships were true for static and dynamic load tests, as well as for speed tests. The findings for the rigid pavement test section indicated that the Westergaard algorithm can be used for reasonable predictio of pavement response to test loadings. The data from the instrumentation program and the traffic tests were used in the analysis of the flexible and rigid pavement test sections. The analysis resulted in a modification of the basic flexible pavement CBR design method. (Author).

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