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    Design and analysis of double composite truss girder for the long span bridges using perfobond leiste
    (İstanbul Gedik Üniversitesi, Lisansüstü Eğitim Enstitüsü, 2025) Saleem, Jaafar Jasim; Muteb, Haitham Hassan
    This research aims to investigate behavior and collect analysis data on the response of a double composite truss girder (DCTG) under increasing static load compared to a single composite truss girder (SCTG) in the same circumstances The study reveals the benefits of a composite structure by the ability to obtain a lightweight girder that is used at the superstructure bridge, especially for long continuous spans with the idea of converting the concrete web to steel truss. The double composite feature will increase the ability of the girder to be high resentence hogging moment at the negative regions at the mid-support of continuous bridges and reduce the deflection ratio; furthermore, the decrease in girder weight will affect positively on the other bridge part design including piers and foundations due to increasing the dimension and steel reinforcement that will lead to lower bridge construction cost and structure durability. The first part, which is the main subject of the experimental work involved fabrication and tested of eight composite truss girder specimens with constant dimensions 2620mm x 350mm x 400mm of steel truss girder divided into two categories depending on the composite installation type. The first category (SCTG) involves implementing a single composite line between the top concrete and the steel truss frame, while the double composite (DCTG) consists of two composite lines between the top and bottom concrete girder and a steel truss frame. The test procedure was made by installing the specimen on the steel support, two at edge and one at middle distance, with applied two-point load by two hydraulic jacks with maximum capacity 3000 KN of each one, the loading was at several stages till the modes of failure occurs. The second part of this research was performed a validation study by numerical analysis method using Abaqus software program to simulating eight models, the dimension and materials parameters such as concrete strength, steel plate, reinforcement bars, also the test situation including applied load and support conditions was the same circumstances of the experimental test, the results get compared, analyzed and listed in detail at chapter six. The experimental test results were clarified by several improvements, such as increasing the girder strength capacity in the double composite girder by 13% compared to the single composite girder. Meanwhile, it's worth mentioning that the stress and strain value of the top concrete surface that causes hogging moment cracks decreased by 42.7% compared to (SCTG) specimens. In terms of perfobond leiste shear connector, it can be stated that these results have clarified the role of the bottom shear connector (double composite), which revolves around the topic of influencing the stresses placed on the top shear connector resulting by the shear flow in the interface between the concrete and steel flange, when the results show decreeing in slip ratio by 18.7% at the top interface, al bond situation at all specimens considered as full interaction state. In general, the most advantage featured of adding double composite was enhancement the ability of girder to decrease the deflection ratio by 31% at the sagging moments regions when the positive moment reach the maximum values due to the continuity of the girder.