Köprülerin Yapısal Analizinde Hareketli Yük Dağıtma Katsayıları Etkisinin İncelenmesi

Bu çalışmada AASHTO-LRFD Köprü Şartnamesinde uygulama ve hesap özellikleri verilen hareketli yük dağıtmakatsayılarının (LLDF) köprülerin analizinde kullanılması araştırılmıştır. Bu amaçla, üç açıklıklı 30-30-30 m ve 33-50-38 m köprülerin LLDF hesaplamaları AASHTO Şartnamesine göre yapılmıştır. Bu köprüler yaklaşık analizyöntemi olan Çizgisel-Kiriş yöntemiyle analiz edilmiştir ve hesaplanan LLDF katsayıları analizde kullanılmıştır.30-30-30 m köprünün SAP2000 programıyla ve 33-50-38 m köprünün CSiBridge programıyla analizi yapılmıştır.Bu programlarla yapılan analizde LLDF katsayıları program tarafından otomatik olarak hesaplamalarakatılmaktadır. Yapılan çalışma sonucunda Çizgisel-Kiriş yöntemiyle analizden elde edilen sonuçların, hassas vekesin analiz yapan SAP2000 ve CSiBridge programlarıyla elde edilen sonuçlara çok yakın olduğu görülmüştür.Böylece, AASHTO Tasarım Şartnamesi’ne göre LLDF hesaplamalarının yapısal analizde kullanımının doğruluğuve uygunluğu ortaya konulmuştur.

Investigation of Live Load Distribution Factors Effect in Structural Analysis of Bridges

In this study, the use of live load distribution factors (LLDF) that application and calculation properties are defined in the AASHTO Bridge Specification, in the analysis of bridges is investigated. For this purpose, LLDF calculations of three spans of 30-30-30 m and 33-50-38 m bridges is made according to AASHTO Specification. These bridges are analyzed by Line-Girder method and calculated LLDF coefficients are used in the analysis. The 30-30-30 m bridge is analyzed by SAP2000 program and the 33-50-38 m bridge is analyzed by CSiBridge program. In the analysis made with these programs, LLDF coefficients are automatically included in the calculations by the program. As a result of the study, it was seen that the results obtained from the Linear-Girder analysis were very close to the results obtained with the SAP2000 and CSiBridge programs which perform precise and exact analysis. Thus, the accuracy and appropriateness of the use of LLDF calculations in structural analysis according to AASHTO Design Specification have been demonstrated.

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