These types of structural elements are particularly attractive because of their high torsional stiffness, which is required when the bridge is curved. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. Example on design of slab bridge design data and specifications superstructure consists of 10m slab, 36m box girder and 10m tgirder all simply supported. Fcm bridge wizard midas civil modeling features model structure wizard fcm bridge type 1 and type 2. Cablestayed bridges with a single plane of stays also employs box girders. However, the primary advantage of box girders is the large torsional stiffness that makes the girders ideal for use in curved interchanges for which the bridge geometry can lead to large torques. This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. Zlk series zlk series double box girder bridge cranes utilize box girders, and are often used where capacities are over 10 tons andor long spans are needed. This site is like a library, you could find million book here by using search box in the header. Design guidelines for steel trapezoidal box girder systems. Effective bracing of steel bridge girders outline stability bracing of i.
In addition, specific information needed to analyze the example bridge described above is provided. Analysis and design of prestressed box girder bridge by irc. When type 2 is selected the user must define the section. Select type 1 to use the default section and tendon parameters for the bridge select type 2 to use the section defined in the psc tab of the section definition. Fsm bridge wizard midas civil modeling features model structure wizard fsm bridge bridge model data type. Box girders are usually considered for footbridges only for spans over about 30m, and most box girder footbridges adopt an allsteel configuration. Project specific documents should specify when and where caps are required. Included as a bonus is a full detailed bill of quantities for the bridge. The advantage in using an allsteel configuration is that the whole cross section, including parapets, can be fabricated at the works for delivery and erection in complete spans. The lightness of steel construction is considered as an advantage typically in these constructions. Depending on the application the box girder can be composite or noncomposite. Read online comparison of tbeam girder bridge with box girder bridge.
R and the number road b and the number bridge m and the number maintenance x and the number railroad s and the number substructure d and the number superstructure a and the number approaches. The box girder normally comprises either prestressed concrete, structural steel, or a composite of steel and reinforced concrete. Direct link design of concrete box girder bridge by jorge. A box girder bridge is a bridge in which the main beams comprise girders in the shape of a. It will also provide design aids and other sources of information along with cross references to other parts of this manual to assist in the design and preparation of plans. An overview of the design and erection issues is presented, particularly those dealing with thin elements in compression.
Design guide for composite box girder bridges steelconstruction. Posttensioned psc box girder bridge using fcm as per. By keeping a constant loading and varying the positions the of the tendons, a comparative study has been done so as to understand. A box girder bridge also known as a box section bridge is a bridge in which the main beams comprise girders in the shape of a hollow box. Pdf advanced calculation methods for box girder bridges. This research study analyzes the several positions in a box girder bridge where the prestressed tendons can be added.
Advantages of steel box girder in bridges civildigital. Concrete boxgirder bridge model tutorials computers and. Prestressed tendons system in a box girder bridge 7. Design and rating for curved steel i and boxgirder bridge structures c. Constructibility checks, stiffener and shear connector designs are also. Double box girder top running overhead cranes emh, inc. Over two hundred200 pages of manual design calculation for a box girder bridge. Department, sri vasavi institute of engineering and technology, andhra pradesh. There have been rapid developments in the state of the art in precast segmental box girder technology such as the evolution of the jointing and erection process, the multiple key designs, and the use of wider sections resting on single pies.
If the default section is to be used for the modeling then type 1 can be used but if the database section is to be used for modeling then type 2 can be used. It is applicable to a composite or noncomposite structure of moderate length with either rolled or fabricated sections and simple or continuous spans. An image of a model taken from the sap2000 bridge examples document is shown in figure 1. The objective is to minimize the total cost in the design process of the bridge system considering the cost of materials, fabrication and installation.
Advantages the advantages of double girder traveling bridge cranes become particularly evident with load capacities over 10 tons, or spans of over 50. This menu is used for data management and has four submenus. Tech structural engineering, mandava institute of engineering and technology, andhra pradesh s. The first girder is internally prestressed, the second is externally prestressed. Both are symmetrical five span girders with constant girder height. Attached is a model file and a pdf which outlines the procedure for modeling a concrete boxgirder bridge, a steelgirder bridge, and a cablestayed bridge. Its on the same location as the i35w bridge before its 2007 collapse. The article concludes by describing the design sequence for a segmental precast concrete box girder bridge. Box girder bridge 2629 we will create a line diagram for the reinforcement cross section forces nx for load combination 4. When and how to make these types of dimensional reductions are important decisions that depend on the. Design examples and boxgirder bridges are included.
For a particular girder span and bridge width, the design variables considered for the. Originally constructed of riveted wrought iron, they are now made of rolled or welded steel, aluminium extrusions or prestressed concrete compared to an ibeam, the advantage of a box girder is that it better resists torsion. For proper display of bridge standards in microstation extract these font files into the c. Indiana bridge the indiana bridge has no skew and is composed of a hollow prestressed concrete box girder with a direct fixation track fig. Box girders are usually prefabricated at shop and brought to site as per specifications. The depth and width of the box girder are 7 and 20 ft 2. The torsional stiffness of a box section is generally in the range of. The investigation found that the failure of only one. Evaluation of prestressed concrete bridges under light.
The box is typically rectangular or trapezoidal in crosssection. A single box can carry the full width of deck with cantilevers. The characteristics of the model are presented in the following list and the material and geometry properties in table1. But this is only true for curved steel box girder bridge. Wisconsin department of transportation bridge manual. Lessons learned in the design and erection of box girder. Utrap for the analysis of trapezoidal boxgirder bridges. Analysis and design of prestressed box girder bridge by. A computer program based on the softened truss model theory is developed and corresponding results are compared with previous theoretical and experimental work for single cell cases. Pdf this research study analyzes the several positions in a box girder bridge where the prestressed tendons can be added. A single box girder as the main longitudinal spine of the bridge is an excellent solution for such situations. Compare the pdf file with the dgn file for validation on correct fonts displayed in microstation. Loading single lane of class 70r or two lanes of class a. Indiana bridgethe indiana bridge has no skew and is composed of a hollow prestressed concrete box girder with a direct fixation track fig.
The cable stayed bridge with 650m span has a total length of 20m. The deck may consist of 3 girders spaced at 2, 45 m. For rectilinear bridges both box and plate girders bridges are competitive. Only the design of slab bridge will be used for illustration. Crsbg continuous riveted steel box girder tcb timber covered bridge superstructure types revised. Design and rating for curved steel i and box girder. Comparison of the amount of reinforcement for a boxgirder. The behavior of box girder section for a general case of an eccentric load has been s tudied and presented its studies in chapter 2. The west gate bridge is one of a number of box girder bridges built during the mid 20th century, and was one of four to fail in a three year period. The obstacle to be crossed may be a river, a road, railway or a valley. This potential for reduction and a clear understanding of dimensionality are important.