To arrive at meaningful results for curved girder bridges grillagebased analyses are not sufficient. Analysis of parameters influencing horizontally curved. Aashto lrfd design examples this link redirects you to the fhwa aashto lrfd design example page. Multiple curved steel girder structures with steel straddle piers modeling. Wisdot bridge manual chapter 24 steel girder structures. Mar 27, 2018 performing analysis on complex bridges, such as curved or flared structures, is a difficult task given the approximations and assumptions inherent in any modeling approach. A finite element model of the bridge revealed that pier flexibility may be important in modeling the. Each curved steel box girder comprises webs of 1 thick plate and top and bottom flange thicknesses of 114 plate. Software for curved bridge girders qshake structural 8 mar 09 11. To arrive at meaningful results for curved girder bridges grillagebased. Benefit from the softwares advanced load rating and analysis. A typical box girder system consists of one or more ushaped steel girders that act compositely with a castinplace concrete deck through the use of welded shear. Beckmann of the american institute of steel construction, who diligently gave of himself to help others achieve the best solutions for the nations steel bridges.
We have just recently purchased this software and i have generated a few questions throughout the modeling of my first structure. Steel composite curved girder bridge design midas civil. Multiple curved steel girder structures with steel straddle piers. Diaphragms in curved girder systems can be located by one of 3 methods. Diaphragms tab to see how diaphragm definitions are assigned to the framing plan. Steel bridge design, analysis software leap bridge steel. The weight of the diaphragms will be computed by the software and applied to the 3d model. Horizontally curved bridges with or without skewed supports and with a maximum lr greater than 0. The purpose of this spreadsheet is to provide a tool and give information to an engineer when deciding the safety of lifting a horizontally curved steel i girder with one crane and two lift clamps. Numerous midas civil questions content hi, i am currently working on modelling a curved, continuous 3 span, superelevated, composite steel i girder structure.
One limitation of the vload method, however, was that ii. Design and rating for curved steel i and box girder. Steel box girder redesign of estero parkway flyover. Abstract this report describes the i girder bending component tests that were conducted as part of the csbrp. The computer program descus i will perform the complete analysis and partial design of a horizontally curved bridge composed of flanged steel sections which act either compositely.
Girder types may be simple span, continuous, hinged or cantilevered with or without integral leg frame configuration. Development of computational software for analysis of curved. Guidelines for steel girder bridge analysis aashtonsba tg for standard curved or skewed structures, use of a conventional grid model is generally adequate. The leading software package for designing and rating curved and straight steel girder bridges for compliance. The wolf creek bridge is a curved, multi girder three span steel composite bridge located south of narrows, virginia, that was completed in 2006. The program can use either the working stress design wsd method, the load factor design method or the load resistance factor design lrfd method. Curved steel bridge comparison on various modeling approaches. Internal x bracing formed of wt and l sections is used in conjunction with diagonal top. Implementation of straight and curved steel girder. Beckmann of the american institute of steel construction, who diligently. Streamline the design of straight and curved igirder and tubgirder bridges with leap bridge steel s computational 3d design and modeling.
The baseline for com parison in this study consists of field data collected during the testing of a curved girder bridge in salt lake city in 1999. The nonlinear layered shell element enables users to consider. I have analyzed several curved steel girder bridges with descus and mdx. Steel plate girder design software purol civilenvironmental op 9 sep 03 12. Analysis of parameters influencing horizontally curved steel igirder bridges during construction. This report, in conjunction with the companion report on fmite element analysis of curved bridges, provides a complete set of analysis procedures for the design and checking of curved steel girder bridges.
Use a 709 grade hps 70w steel for painted bridges if it is economical or otherwise beneficial to do so. This bridge was a semicomposite which made the analysis m uch more complicated, steel girder bridge about 25 years ol d. This bridge is the igirder design example presented in the appendix of the aashto guide specifications for. Provide blockouts in decks and approach slabs at expansion joints to allow for placement of the joint. Here is one of the curved bridges im building now, it has 3 deck girders, 1 modified deck girder which is really closer to a thru girder, an i beam section and a concrete box girder. Figure 3 3d model of curved tub girder figure 4 3d model of curved i girder 2. Performing analysis on complex bridges, such as curved or flared structures, is a difficult task given the approximations and assumptions.
Design and rating for curved steel i and boxgirder bridge structures c. It covers in full detail the philosophy, design, fabrication and setup of these tests. Engineering software texas department of transportation. Design and rating for curved steel i and box girder bridge.
Steel composite curved girder bridge design midas civil online training. Specifies to prepare drawings in accordance with aashtonsba steel bridge collaboration s10. Behavior ofcurved steel trapezoidal boxgirders during. See the adjacent software information links for general details regarding lusas bridge software products. Streamline the design of straight and curved igirder and tubgirder bridges with leap bridge steels computational 3d design and modeling. Use a 709 grade 50w or hps 70w steel for unpainted bridges. Skewed and curved steel i girder bridge fit contributors fred beckman, consultant this document is dedicated to the late fred r. Software ferguson structural engineering laboratory. These tools were previously packaged together and posted to the txdot engineering software webpage as utcgat ut curved girder analysis tools. Curved bridges descus i for plate girders and descus ii for box girders.
Implementation of straight and curved steel girder erection design tools construction. Girders may be constructed of steel, reinforced concrete, prestressed concrete pre and. Benefit from the softwares advanced load rating and analysis capabilities, such as linegirder, grillage, and finite element analysis, which will enable you to evaluate steel bridges faster and deliver. Composite steel and composite prestressed concrete girders may be included. With curved girder structures significant torsional stresses must be accounted for at the design stage and careful consideration is also required to ensure their safe erection. Analysis of parameters influencing horizontally curved steel. Software for curved bridge girders structural engineering. Program will read program input from the descus ii program with additional data for construction staging to investigate effects of a curved girder bridge during construction. Skewed and curved steel igirder bridge fit contributors fred beckman, consultant this document is dedicated to the late fred r. Benefit from the software s advanced load rating and analysis capabilities, such as linegirder, grillage, and finite element analysis. Ut lift is an easy to use, macroprogrammed excel spreadsheet for determining the behavior during lifting of straight and horizontally curved steel igirders with one crane and two lift clamps. A finite element model of the bridge revealed that pier. This design example illustrates the design calculations for a curved steel igirder bridge, considering.
Curved bridge design bridge engineering software optimate. As discussed earlier, during the construction ofthese curvedgirder systems, the concrete deck is poured in a number. Comparison of measured and computed stresses in a steel. Best and worst construction methods best minimizes radial, tangential, vertical deflection worst results in largest radial, tangential, and vertical deflection all 30 parametric bridges were analyzed one case presented summary of results for all cases. This design example illustrates the design calculations for a curved steel i girder bridge, considering the strength, service, fatigue and constructibility limits states in accordance with the aashto lrfd bridge designs specifications. Abstract the design of mu1tigirder bridge units with horizontal curvature is complicated by the torsional forces induced by the curvature. Design and analysis of curved igirder bridge system.
The aashtoware bridge management software is a comprehensive asset management system developed to assist in the challenging task of bridge management. References and bibliography the national academies press. Curved steel bridge comparison on various modeling. Design and rating for curved steel i and box girder bridge structures c. Pushover analysis features in csibridge include the implementation of fema 356 and the hinge and fiber hinge option based on stressstrain. Construction staging is an integrated utility program designed specifically for the construction staging of a curved steel bridge.
Aashtoware bridge features several modules that will help you manage every aspect of bridge construction and management. Performing analysis on complex bridges, such as curved or flared structures, is a difficult task given the approximations and assumptions inherent in any modeling approach. Refined analysis of horizontally curved, steelgirder bridges is recommended to estimate thermal effects because even slight curvature may develop large radial forces at bearings. Sep 23, 20 steel composite curved girder bridge design midas civil online training. Features bridge analysis, design and rating csibridge. Girders may be constructed of steel, reinforced concrete, prestressed concrete pre and posttensioned, and timber. Midas customer online support curved steelcomposite. Wisdot bridge manual chapter 24 steel girder structures july 2019 245 24. Abstract this report describes the igirder bending component tests.
Curved or skewed girder bridges with composite steel plate girder are frequently simulated with plate and beam elements instead of beam elements with composite section. Material properties the material properties are assigned to concrete and steel as follows. Steel plate girder design software structural engineering. I was woundering what software do some of you use and recommend for this type of application. For instance, if a curved girder analysis is being performed and the lateral forces in the top and bottom flanges are required then the shell element modelling and beam element modelling of flange.
Skewed and curved steel igirder bridge fit 1 nsba technical committee, fit task force. The wolf creek bridge is a curved, multigirder three span steel composite bridge located south of narrows, virginia, that was completed in 2006. Appendix b task 9 report recommendations for construction. Design resource center delaware department of transportation. Pdf comparison of measured and computed stresses in a steel. Where cross frame fatigue forces control the design, use of a refined model for live load conditions should be considered.
Implementation of straight and curved steel girder erection. Refined analysis of horizontally curved, steel girder bridges is recommended to estimate thermal effects because even slight curvature may develop large radial forces at bearings. Development of computational software for analysis of. If that is case we will have to use steel plate girder and the structure analysis program we current us for your single span steel girder bridges is not very user friendly for continuous structures. The computer program descus i will perform the complete. Specifies to perform girder erection analyses using txdot provided software utlift and ut bridge when applicable, or use other suitable commercial software. Introduction curved, trapezoidal, steel box girders have been used extensively in recent years. The program is able to model the partiallycomposite behavior due to concrete curing during the bridge deck pours. B4 guidelines for analysis methods and construction engineering of curved and skewed steel girder bridges 2. Live load the curved bridges are assumed to be functioned as metro bridges and therefore the loading. Analysis result comparison with industry standard software.
Numerous midas civil questions content hi, i am currently working on modelling a curved, continuous 3 span, superelevated, composite steel igirder structure. This bridge is the igirder design example presented in the appendix of the aashto guide specifications for horizontally curved steel girder highway bridges, 2003. It is concluded that the curved girder analysis software captures the general behavior well for these types of curved girder bridge systems at or below the service load level, and that the. Program will read program input from the descus ii program with additional.
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