The prestressed precast concrete girder analysis and design program, dashp. Computations include linear elastic analysis firstorder and secondorder and eigenvalue buckling analysis for both girder erection and concrete deck placement. The most commonly used superstructure definitions girder system superstructure girder line superstructure reinforced concrete slab system superstructure. Tutorials also illustrate how to use new load rating software components such as gusset plate analysis, 3d modeling, and curved girder analysis. Torsional load a plan view of the top flange of one of the girders in the example curved bridge is shown in figure 2. The horizontal alignment is curved with a radius of 2,830. Design and rating for curved steel i and box girder bridge. Benefit from the software s 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 your projects on time and under budget. The models are made with varying radius of curvature and bracing spacing to study their influence in the analysis results. The v load method is a widely used approximate method for the analysis of horizontally curved i girder highway bridges. Girder is a feature rich windows home automation software available.
Content on this page requires a newer version of adobe flash player. Comprehensive design example for prestressed concrete psc girder superstructure bridge design step 7 design of substructure design step 7. The specifications shall be based on the recommended specifications for horizontally curved steel highway bridges developed under nchrp project 1238,which are in a load factor design format, supplemented by the results of the fhwa largescale curved i girder tests as they become available. Curved deck on straight parallel beam design bridge. Load distribution factors for horizontally curved composite.
The finiteelement analysis softwaresap2000 is used to examine the key parameters that can influence the distribution factors for horizontally curved composite steel girders. The program can use either the working stress design wsd method, the load factor design method or the load resistance factor design lrfd method. Girder controls programs like winamp and windows media player using infrared and wireless remote controls so you can sit back. So the deck edge will be variable from about 9 to 49. All live load ll computations also are performed automatically where the aashto truck and lane loadings are applied to an influence surface previously generated for the entire bridge. The model should represent all members in the superstructure system. Development of computational software for analysis of. Girder is a graphical user interface that allows easy access to devices like lights, security systems, home theater, and any or all pcs functions including full application control for any program. He demonstrated how to use midas civil to model curved steel box girder bridges as well as go over the procedure he followed to perform load rating. Corrugated metal pipe cmp culvert rating spreadsheets.
In the vload method, the curved girders are analyzed as isolated straight girders with developed span lengths equal to their respective arc lengths, l1 and lz. Curved steel bridge comparison on various modeling. In our past webinar, pankaj shrestha of gm2 associates, inc. In this post, we are going to evaluate the potentials of staad pro software in the analysis of box girder bridge subjected to load model 1 of eurocode 1 part 2. Diaphragms in curved girder systems can be located by one of 3 methods. This link redirects you to the trbs website where nchrp report 725 guidelines for analysis methods and construction engineering of curved and skewed steel girder bridges can be found. Design resource center delaware department of transportation. Both girder systems are subjected to lateral thrust from noncollinear flange forces. Integral abutments are used to eliminate expansion joints at the end of a bridge. Input and output may be created using english units. Previously, this method had been proven valid only for noncomposite i girder bridges with radial supports. 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. Streamline the design of straight and curved igirder and tubgirder bridges with. Currently we only have line girder design software here at the office merlin dash.
The curvature in a curved girder generates a distributed out of plane flange load, compared to a concentrated point load from a kinked girder that is shown in figure 4. Csibridge load rating calculates the safe load capacity of a bridge based on the requirements of the aashto manual for condition evaluation and load and resistance factor rating lrfr of highway bridges october 2003 with 2005 interim revisions and the manual for bridge evaluation second edition 2011 with 20 interims. 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 idealisations would be suitable but the beam element modelling of the whole girder would not. Approximate analysis of horizontally curved girder bridges by ann l. Bridgelink is another free software in this bridge design software list for windows. Jul 04, 2007 this study focuses on a threespan, curved steel igirder bridge which was tested under three boundary condition states to determine its response to live load. Comprehensive design example for prestressed concrete psc. Use only one lane of live load in the structure model when checking the fatigue and fracture limit state. The measured liveload strains were used to calibrate a finiteelement model.
Previously, this method had been proven valid only for noncomposite igirder bridges with radial supports. 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. Analysis of box girder bridges using staad pro structville. By using a fullsize test, compensatory dead load would also not be required. Pgsuper precastprestressed girder design and analysis software. Curved girder analysis looking for vload design example. Baber associate professor department of civil and environmental engineering university of virginia introduction since the early 1990s, horizontally curved girder bridges have represented more than one.
Curved box girder bridge the crosssection of the bridge deck is shown in figure 2. Ut bridge is a 3dimensional finite element program for the analysis of curved steel igirders and steel tub girders. You need to start with specifying input parameters to design a specific bridge structure. Flange forces observed for kinked girder structure are inherently similar to curved girders. Grubb abstract the vload method is a widely used approxi mate method for the analysis of horizontally curved. Post tensioned psc box girder bridge using balanced cantilever method fcm as per eurocode duration. Design and rating for curved steel i and box girder bridge structures c. The program utilizes finite element theory of analysis and current aashto load resistance factor design lrfd specifications. Girder is the award winning, home, office and industrial automation software that allows users of all skill level to make advanced scripts and macros to automate many functions both on the computer and around the house or office. Nov 29, 2018 during this upcoming webinar he will provide the results of a model comparison study performed for a highly curved bridge 200ft radius that included a midas civil grillage model and allplate model,leap steel grillage model, and mdash girder line analysis with v load approximations. Girder automation software for home automation and commercial. The program can be run using either working stress design wsd method, load factor design lfd method or the lrfd specifications for curved girders. The bridge may be of arbitrary plan configuration and can be continuous and skewed over supports. Performing analysis on complex bridges, such as curved or flared structures, is a difficult task given the approximations and assumptions inherent in.
It lets you design different kinds of bridge projects including box girder, spectra, curved, prestressed girder, ibeams, ubeams, and many more. This paper focuses on load distribution factors for horizontally curved composite concretesteel girder bridges. Additional constant dead load is allowed input per girder as a special program option. 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 igirder with one crane and two lift clamps. Features bridge analysis, design and rating csibridge. Steel composite curved girder bridge design midas civil. 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. The weight of the diaphragms will be computed by the software and applied to the 3d model. Brassgirder is a comprehensive system for the analysis and rating of highway bridge girders. These tools were previously packaged together and posted to the txdot engineering software webpage as utcgat ut curved girder analysis tools. Threespan december 2015 continuous horizontally curved composite steel i girder bridge 6. Streamline the design of straight and curved igirder and tubgirder bridges with leap bridge steels computational 3d design and modeling.
Girder automation software for home automation and. Sep 23, 20 post tensioned psc box girder bridge using balanced cantilever method fcm as per eurocode duration. 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. Design and analysis of curved igirder bridge system. The computer program descus ii will perform the complete analysis of a horizontally curved bridge composed of steel box sections which act either compositely or noncompositely with a concrete deck. 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. Software ferguson structural engineering laboratory. The question, then, is in what condition should an i girder bridge be detailed to fit. Development of computational software for analysis of curved girders under construction loads cem topkaya, eric b. Curved bridge design bridge engineering software optimate. Qconbridge live load analysis for the aashto lrfd bridge design specification hl93 live load model. Girder is a graphical user interface that allows easy access to devices like lights, security systems, home theater. Steel bridge design, analysis software leap bridge steel.
Liveload analysis of a curved igirder bridge journal of. In this paper, models of box girder and i girder bridges are created in midas civil software which is found to give very accurate results. We are planning to keep all of the beams straight and parallel. Engineering software texas department of transportation. Analytical and field investigation of horizontally curved girder bridges. Aashto lrfd design examples this link redirects you to the fhwa aashto lrfd design example page. This allows for future modifications to specific members. Introduction and research approach the national academies press. Use a singlelaneloaded multiple presence factor of 1. Aashto has nearly 100 tutorials to help users with conducting load ratings for various types of structures.