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العنوان
STUDY OF SEISMIC BEHAVIOR OF INNOVATIVE SELF-CENTERING STEEL BRIDGE COLUMNS
المؤلف
ALI, AHMED THARWAT MOHAMED
هيئة الاعداد
باحث / احمد ثروت محمد على
مشرف / على جمال على عبد الشافى
مناقش / صدقى عبد الله تهامى
مناقش / محمد عبد الباسط عبدة
الموضوع
STEEL BRIDGE
تاريخ النشر
2021
عدد الصفحات
125 P.
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الهندسة المدنية والإنشائية
الناشر
تاريخ الإجازة
3/10/2021
مكان الإجازة
جامعة أسيوط - كلية الهندسة - الهندسة المدنية
الفهرس
Only 14 pages are availabe for public view

from 157

from 157

Abstract

In accelerated bridge construction (ABC) system, this study investigates the general performance of self-centering (SC) concrete filled steel tube (CFST) bridge columns, in whichbuckling restrained steel (BRS) plate is used as a replaceable energy dissipation (ED) system.The study is divided into three parts, the first part of this study presents a general evaluation of the seismic response of CFST bridge columns.The study focuses on the overall response (load drift response, lateral stiffness, and energy dissipation capacity) during earthquake action and the overall response (failure mode, permanent deformation and repairability) after earthquake action. In addition, a comparison between available energy dissipators is presented. The second part of this study attempts to provide a complete answerfor the raised question ”how to control the behavior of the entire system from micro and macro analysis point of view?” Micro analysis discusses the effect of the BRS on the general response of the structure and macro analysis illustrates the general hysteretic response and failure mode of the entire system (Self-centering system with BRS).The third part of this study focuses onthe resilience-based design of this new type of structural system.
Therefore, a detailed three-dimensional finite element modeling (3D-FEM) was carried out using commercial software (ABAQUS 6.13-4).In the light of available experimental results, the created finite element model can capture the behavior of such SC system:the gap opening/closing at the pier base interface;failure mode, stresses, and strain of the energy dissipation system; stresses; and self-centering capacity of the entire system. Good agreement was observed between the numerical and experimental results, which proves the accuracy of the developed finite element model. To control the micro and macro behavior of the entire system,33 numerical models have been studied. The parameters depend on the change of BRS geometry, axial load ratio and mechanical characteristics of the BRS manufacturing materials. The results showed that the studiedparameters have a great influence on the performance of the structure, and the stability of BRS depends on the out-of-planeslenderness ratio (L/i, where L is the clear length of the BRS and i is the radius of gyration).To obtain a resilient structure, which requires no (or minimal) repair even after strong earthquakes and remains highly functional for immediate aftershocks or future earthquakes,this study proposes two approaches that can be followed: one is based on the geometry of the BRS system and the other depends on the change of the partial BRSsystem to fully BRS system.