Factors Affecting the Capacity Utilization of Road Freight Transport in Turkey

Fayyav, Muhammad
Tüydeş Yaman, Hediye
Road freight accounts for 89% of the inland freight transportation in Turkey. This study examined the factors affecting capacity utilization in Turkey with a specific focus on load factors and empty running. These two decisions, the load factor and the choice of running empty, are modeled jointly in a Heckman model. The model results showed that rigid and articulated trucks represent relatively different transport markets. Their age and the distance profile of the shipments affect the load factor and the probability of running empty. These effects are further examined for different commodity types and by testing different econometric specifications.


Improved Seismic Response of Multisimple-Span Skewed Bridges Retrofitted with Link Slabs
Sevgili, Gizem; Caner, Alp (American Society of Civil Engineers (ASCE), 2009-11-01)
Results of a recent bridge inventory evaluation indicated that about 50% of Turkish highway bridges have more than 30 degrees of skew angle and can be classified as irregular bridges. During the recent major earthquake in Turkey, multisimple-span bridges with continuous decks and link slabs performed well even though these bridges were in the vicinity of the fault line. This study aims to evaluate the improvements in seismic response of skew bridges in terms of forces and displacements when link slabs are a...
Rating and reliability of existing bridges in a network
Akgül, Ferhat (American Society of Civil Engineers (ASCE), 2003-11-01)
Currently, the load rating is the method used by State DOTs for evaluating the safety and serviceability of existing bridges in the United States. In general, load rating of a bridge is evaluated when a maintenance, improvement work, change in strength of members, or addition of dead load alters the condition or capacity of the structure. The AASHTO LRFD specifications provide code provisions for prescribing an acceptable and uniform safety level for the design of bridge components. Once a bridge is designe...
Evaluation of Top Flange Bracing Systems for Curved Box Girders
Topkaya, Cem; Williamson, Eric B. (American Society of Civil Engineers (ASCE), 2005-11-01)
In recent years, steel trapezoidal box girders for curved highway interchanges have become popular. For these bridge systems, significant steel girder cross-sectional stresses occur during the concrete casting sequence. To help resist construction loads, a lateral truss system is installed at a level close to the top flanges to form a "pseudo-closed" section, which has a higher torsional stiffness than an open U-section. Several recent incidents, ranging from the buckling of individual bracing members to th...
Dynamic investigation and rehabilitation of existing railway truss bridge under high speed train loadings for passenger comfort
Mutlu, Gündüz; Yılmaz, Çetin; Department of Civil Engineering (2008)
In Turkey, big investments are made to improve the existing train lines for use of new high speed trains. Most of the bridges on the existing train lines are typical and in this thesis one of the standard types, the classic steel truss bridge is investigated. This thesis presents the dynamic investigation of standard type existing truss bridge for passenger comfort criteria under the high speed train loadings. Two different computational analysis models have been developed to idealize the vehicle-bridge mod...
Impact of passanger comfort level on design of short-span composite steel i-girder high speed railroad bridges
Şentürk, Tolga; Caner, Alp; Department of Civil Engineering (2009)
In globalizing world, increase in demand for high speed rail travel requires comfortable ride over bridges while maintaining an economical design. These bridges either have composite steel I-girders, prestressed precast I or box girder superstructures. The span lengths can reach up to 40 meters. If frequency of wheel load pass at a point on bridge matches with one the critical frequencies of the structure, excessive vibration can developed both at the train and the bridge even if the structure is structural...
Citation Formats
M. ÖZEN, M. Fayyav, and H. Tüydeş Yaman, “Factors Affecting the Capacity Utilization of Road Freight Transport in Turkey,” TEKNIK DERGI, pp. 9813–9832, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34357.