EFFECT OF SOIL COMPRESSIBILITY ON THE STRUCTURAL RESPONSE OF BOX CULVERTS USING FINITE ELEMENT APPROACH

Authors

  • OU Ubani DEPARTMENT OF CIVIL ENGINEERING, NNAMDI AZIKIWE UNIVERSITY, AWKA, ANAMBRA STATE, NIGERIA
  • CMO Nwaiwu DEPARTMENT OF CIVIL ENGINEERING, NNAMDI AZIKIWE UNIVERSITY, AWKA, ANAMBRA STATE, NIGERIA
  • JI Obiora DEPARTMENT OF CIVIL ENGINEERING, NNAMDI AZIKIWE UNIVERSITY, AWKA, ANAMBRA STATE, NIGERIA
  • EO Mezie DEPARTMENT OF CIVIL ENGINEERING, NNAMDI AZIKIWE UNIVERSITY, AWKA, ANAMBRA STATE, NIGERIA

Keywords:

Box Culvert, Modulus of Subgrade Reaction, Soil Settlement, Staad Pro.

Abstract

The structural response of box culverts to variable soil compressibility condition was studied in this paper. This was made possible by modelling the soil as springs, and varying the spring stiffness which was represented by the modulus of subgrade reaction of the soil. The results showed that the values of maximum bending moments for gravity actions on box culverts increased linearly with modulus of subgrade reaction, but remained within close values. The results also showed good agreement with results from literature for highly compressible soils. However, for incompressible soil condition, results from standard tables in literature were more conservative with about 10% difference for gravity actions, and 21% difference for lateral actions. The term ‘highly compressible’ that was used in literature for manual analysis was discovered to be more valid for lateral load cases than for gravity load cases. Subsequently, the variations of other action effects such as shear force, axial force, torsion, and soil spring settlement with modulus of subgrade reaction were also studied.

 

http://dx.doi.org/10.4314/njt.v39i1.5

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Published

2020-01-03

Issue

Vol. 39 No. 1 (2020): NIGERIAN JOURNAL OF TECHNOLOGY, VOL. 39, NO. 1, JANUARY 2020

Section

Building, Civil & Geotechnical Engineering

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How to Cite

EFFECT OF SOIL COMPRESSIBILITY ON THE STRUCTURAL RESPONSE OF BOX CULVERTS USING FINITE ELEMENT APPROACH. (2020). Nigerian Journal of Technology, 39(1), 42-51. https://nijotech.com/index.php/nijotech/article/view/2215