تقييم الأداء الزلزالي للركائز البيتونية المسلحة لجسور السكك الحديدية تحث جأثير التعب الحاصل من الحمولات المرورية

الموضوعات

علوم تطبيقية وتكنولوجية

روابط وملفات

التعريف والنوع

رقم الوثيقة

054bed30-1e57-4b31-aee4-1ec7e3da7bd7

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1957553_1.pdf

بيانات النشر

ترجمة العنوان

SEISMIC ASSESSMENT OF REINFORCED CONCRETE RAILWAY BRIDGE PIERSUNDER TRAFFIC FATIGUE EFFECTS

ألقاب المؤلفين

[{"name_ar":"رأفت الادلبي","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"رويدة رئيف عباس","title_ar":"اعداد","title_en":"Preparation"}]

اللغة

Arabic

المصدر والدورية

اسم المصدر

تقييم الأداء الزلزالي للركائز البيتونية المسلحة لجسور السكك الحديدية تحث جأثير التعب الحاصل من الحمولات المرورية

المحتوى والصفحات

عدد الصفحات

206

ترجمة الملخص

Traditionally in seismic performance assessment of reinforced railway bridges ,it is implicitly assumed that bridges are optimally maintained during their lifetime neglecting any deterioration mechanism that may adversely affect their structural performance.On this basis, the impact of fatigue caused by railway traffic on bridges is not accounted for .In small-span bridges the effects of traffic loads are several times higher than those of the dead loads. Thus, traffic loads are causing large stress variations and therefore, critical sections are prone to fatigue . It is displayed as a change in material mechanical properties .To shed light on seismic performance assessment of railway bridge piers with moment connectors to superstructure sunder fatigue conditions, a model of 121 frame bridges in Swiss is used as case of study, the model has been already tested cyclically between20KN and 120KN with a total of 2.665 million load cycles ,The frequency of loading was at 4.3HZ ,Emphasis was placed on calculating moment of inertia of all sections after 2 million cycles to be as fatigue damage. In this study expected damage due to fatigue defined based on increasing cross sectional strain and thus the loss in sectional compression zone. The cross section degradation and their influence on seismic response are illustrated through nonlinear static pushover analysis.SAP2000 is used to perform pushover analysis for the model without any loading that is age 0, and for model that has been exerted fatigue with 2 million cycles. results show a 9% reduction in both shear and moment yield capacities of frame under 2 million cycles as compared to that of a pristine model, the peak rotational ductility dem and of 2.9for the pristine model already indicates significant damage in the form of cracking and saplling, after 2 million cycles the model suffers peak rotational ductility demands of 3.5, which signifies a more severe damage in the form of longitudinal rein for cement buckling .frame bridge; that has been exerted fatigue shows an overall increase in seismic vulnerability over time , that indicating significant effects of deterioration due to fatigue

إشراف وإعداد

الإشراف

رأفت الادلبي

الإعداد

رويدة رئيف عباس

الاقتباسات الببليوغرافية