tailieunhanh - Bearing capacity of shell strip footing on reinforced sand

In this paper, the ultimate load capacities of shell foundations on unreinforced and reinforced sand were determined by laboratory model tests. A series of loading tests were carried out on model shell footing with and without single layer of reinforcement. The tests were done for shell foundation at different shell embedment depth and subgrade density. The results were compared with those for flat foundations without reinforcement. The model test results were verified using finite element analysis using program PLAXIS. The experimental studies indicated that, the ultimate load capacity of shell footing on reinforced subgrade is higher than those on unreinforced cases and the load settlement curves were significantly modified. The shell foundation over reinforced subgrade can be considered a good method to increase the effective depth of the foundation and decrease the resulting settlement. Also the rupture surface of shell reinforced system was significantly deeper than both normal footing and shell footing without reinforcement. The numerical analysis helps in understanding the deformation behavior of the studied systems and identifies the failure surface of reinforced shell footing. | Journal of Advanced Research 2015 6 727-737 Cairo University Journal of Advanced Research ORIGINAL ARTICLE Bearing capacity of shell strip footing on reinforced sand CrossMark . Azzam . Nasr Department of Structural Engineering Faculty of Engineering Tanta University Tanta Egypt ARTICLE INFO ABSTRACT Article history Received 8 January 2014 Received in revised form 2 April 2014 Accepted 11 April 2014 Available online 19 April 2014 Keywords Shell foundation Ultimate load capacity Sand Reinforcement Shell efficiency Settlement factor In this paper the ultimate load capacities of shell foundations on unreinforced and reinforced sand were determined by laboratory model tests. A series of loading tests were carried out on model shell footing with and without single layer of reinforcement. The tests were done for shell foundation at different shell embedment depth and subgrade density. The results were compared with those for flat foundations without reinforcement. The model test results were verified using finite element analysis using program PLAXIS. The experimental studies indicated that the ultimate load capacity of shell footing on reinforced subgrade is higher than those on unreinforced cases and the load settlement curves were significantly modified. The shell foundation over reinforced subgrade can be considered a good method to increase the effective depth of the foundation and decrease the resulting settlement. Also the rupture surface of shell reinforced system was significantly deeper than both normal footing and shell footing without reinforcement. The numerical analysis helps in understanding the deformation behavior of the studied systems and identifies the failure surface of reinforced shell footing. 2014 Production and hosting by Elsevier . on behalf of Cairo University. Introduction Shell foundation has been considered the best shallow foundation for transferring heavy load to weak soils where a conventional shallow foundation undergoes .