8305

7703

كارشناسي ارشد

آب

اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران

1392

ده،101ص.‌:مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمدرضا چمني

امير مهدي حلبيان

1/10/92

حميد هاشم الحسيني، كيوان اصغري

مهندسي عمران

ID7703

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

MohammadHosein Monemi m monemi@cv iut ac ir Data of submission July 21 2013 Department of Civil engineering Isfahan University of Technology Isfahan Iran Degree M Sc language Farsi Supervisor MohammadReza Chamani m chamani@cc iut ac ir Counselor AmirMahdi Halabian mahdi @cc iut ac ir Abstract Bridges failures because of local scour at piers are common occurrences Local scour occurs as the result of interaction between water and soil either naturally by the changes of rivers morphology or artificially as the result of structures constructed by human Most bridges includes complex piers that are supported by deep foundation and includes groups of piles As the maximum of depth of scour in not reached suddenly the loading capacity of bridges piles are reduced before the occurrence of the maximum depth of scour To study the capacity of a single pile loading during the local scour process a dynamic analysis is necessary There is not any numerical model that is capable of simulating the local scour and the dynamic analysis of a pile simultaneously The present work developed procedures for studying the loading capacity of a single pile during the scour process SSIIM software is used for estimating the scour process and dynamic analysis is then modeled in ABUQUS software The behavior of the pile during the scour process is studied by linking these two softwares The result of dynamic modeling is verified by DYNA5 before linking to SSSIM The link program was written in MATLAB software and verified by comparing the outputs with the inputs of the program In addition method are presented based on simplification of the scour hole shape The numerical results of the scour pattern around the single pile using SSIIM software are deviates considerably from those of the experimental data The maximum scour depth was also compared with the experimental data and it was observed that SSIIM software is capable of estimating the maximum scour depth within acceptable errors The comparison of results in ABUQUS and DYNA5 models displayed minor errors for stiffness than those of attenuation The results of ABUQUS model show the operation of piles at lower frequencies are better than those at higher frequencies With linking ABUQUS and SSIIM it was observed that during the early stages of scour the dynamic stiffness has less variation as compared with the final stages of scour process Keyword scour single pile dynamic stiffness SSIIM ABUQUS DYNA5 PDF created with pdfFactory trial version www pdffactory com

محمدرضا چمني

امير مهدي حلبيان

حميد هاشم الحسيني، كيوان اصغري