THE DEFLECTION AMPLITUDE UNDER VEHICLE AXLE LOADS USING ELASTIC LAYER SYSTEM

1Civil Engineering Department,King Saud University, Riyadh, KSA

2Civil Engineering Department Al_Azhar University, Cairo, Egypt.

Concrete slabs rested directly by the soil continuum are a very common runway construction

form. Predicting the settlements of road-RC slab on different subsoil and/or embankment

under vehicle axle loads is presented. The vertical elastic downward deflection amplitude is

calculated by using layered elastic computer package called Ever-series analysis program.

The mathematical model is applied to case of surface tandem axle traffic loads. The analysis

simulation was applied to study four different practical elastic multi-layered cases in Saudi

Arabia. Each case, when it carries vehicle axle loads, is influenced by the below and above

layer characteristics.The presented results can be used to estimate pavement, RC slab,

subgrade or embankment layer thickness values, or compare critical deflections with

allowable values, in order to achieve satisfactory and economical designs. Also, the

deflection curves presented herein are useful for designing the unsupported garage ground

floor slabs, ramps, plat forms, and bus stations runway iterance.