Load distribution factors for horizontally curved concrete box girder bridges

مقدم أطروحة جامعية

Hasan, Hashim Muhammad

مشرف أطروحة جامعية

Khalil, Raid I.
Sayhood, Iyad K.

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم هندسة البناء و الإنشاءات

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2013

الملخص الإنجليزي

Curved reinforced concrete box girder bridges have become an important component in highway systems.

A simplified analysis method is needed for analyzing new bridges.

If appropriate simplified formulas for load distribution factors exist, there is no need for complex analysis.

In this study, a 3-D finite element model was used for the analysis of the curved slab built monolithically with box girders.

A parametric study was carried out to calculate the load distribution factors for curved reinforced concrete box girder bridges based on (AASHTO 1996) live loads by using F.E.M by SAP 2000 (Structural Analysis Program).

The parameters considered in this study were: span-to-radius of curvature ratio, span length, number of longitudinal girders, girder spacing and number of lanes.

The analysis of the bridge was done for the case of full live load and partial live loads.

The results using developed empirical equations as compared with the moment distribution factor of AASHTO are between (0.9-1.26) for interior girder of two boxes bridge, (0.76-0.9) for exterior girder of two boxes bridge, (1.08-1.38) for interior girder of three boxes bridge and between (0.420.8) for exterior girder of three boxes bridge; these values are reasonably close to AASHTO 1996.

The full data are given together with AASHTO 1996 calculations of L/R ratio in range (0-0.9).

The results of the present study show the moment distribution factor and deflection distribution factor for curved bridge if compared to the straight bridge (L/R=0) decrease as the curvature ratio increases in most cases.

^DF percentage of curvature is between (28% - 281%).

The DDF percentage of curvature is between (21% - 277%).

التخصصات الرئيسية

العلوم الهندسية والتكنولوجية (متداخلة التخصصات)

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-417701