![]() ![]() This term is measured and expressed as load intensity per unit of displacement. Is there any relationship between bearing capacity and modulus of subgrade reaction? Modulus of Subgrade Reaction (Ks) As more and more engineers will use software to design foundations, it is essential for engineers to have a fundamental understanding of this soil parameter. Many engineers are not familiar with this term and often try to compare it with bearing capacity. However, these computer programs often ask for an input called “modulus of subgrade reaction”. Manual computation of flexible analysis could be challenging and, in almost all cases, software programs such as STAAD, SAFE, GT STRUDL etc. But for large and multi column foundations, most engineers prefer flexible analysis. That particular assumption works well in practice for small and single column footings. However, that simplicity assumes the footing will behave as a rigid body. Because of simplicity and ease of use, this method is still the fundamental soil parameter for foundation design. The obvious reason is that basic examples given in most text books almost always use bearing capacity to calculate the plan dimension of a footing. Probably the most widely used value in a soil report is soil bearing capacity. ![]()
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