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A platform for research: civil engineering, architecture and urbanism
Evaluation of Erection Procedures of the Horizontally Curved Steel I-Girder Ford City Veterans Bridge
In the case of horizontally steel curved I-girder bridges, it is important to carefully analyze the erection sequence of the superstructure so as to ensure that difficulties do not arise in the field during construction of the bridge. Generally, problems with curved girder bridges results from unwanted displacements, stresses, and instabilities that occur during erection. For this reason, the bridge engineer should explore a variety of erection sequences to ensure each phase of construction proceeds as anticipated to make certain that the steel superstructure satisfies the intended design parameters (i.e. deck elevations, girder web plumbness, etc.). Additional construction difficulties can result from inconsistent detailing of cross-frame members, which are primary load carrying members in steel curved I-girder bridges. Given that horizontally curved I-girders deflect vertically and horizontally upon loading, the web of the girders cannot remain plumb both before and after load is applied. An inconsistency occurs when the design engineer, the bridge erector, or the owner desires to have the web of the girders plumb before and after erection. For example, if the girders are fabricated to fit cross-frames in a web-plumb, no load condition, but the cross-frames are detailed to connect girder in a web-plumb position after load application, an inconsistency develops. In some cases, the inconsistent detailing of cross-frame members can lead to extreme problems during construction of curved I-girder bridges.
Evaluation of Erection Procedures of the Horizontally Curved Steel I-Girder Ford City Veterans Bridge
In the case of horizontally steel curved I-girder bridges, it is important to carefully analyze the erection sequence of the superstructure so as to ensure that difficulties do not arise in the field during construction of the bridge. Generally, problems with curved girder bridges results from unwanted displacements, stresses, and instabilities that occur during erection. For this reason, the bridge engineer should explore a variety of erection sequences to ensure each phase of construction proceeds as anticipated to make certain that the steel superstructure satisfies the intended design parameters (i.e. deck elevations, girder web plumbness, etc.). Additional construction difficulties can result from inconsistent detailing of cross-frame members, which are primary load carrying members in steel curved I-girder bridges. Given that horizontally curved I-girders deflect vertically and horizontally upon loading, the web of the girders cannot remain plumb both before and after load is applied. An inconsistency occurs when the design engineer, the bridge erector, or the owner desires to have the web of the girders plumb before and after erection. For example, if the girders are fabricated to fit cross-frames in a web-plumb, no load condition, but the cross-frames are detailed to connect girder in a web-plumb position after load application, an inconsistency develops. In some cases, the inconsistent detailing of cross-frame members can lead to extreme problems during construction of curved I-girder bridges.
Evaluation of Erection Procedures of the Horizontally Curved Steel I-Girder Ford City Veterans Bridge
B. W. Chavel (author) / C. J. Earls (author) / W. Kepler (author)
2002
532 pages
Report
No indication
English
Highway Engineering , Structural Mechanics , Highway bridges , Girder bridges , Erection sequences , Support reactions , Dynamic structural analysis , Cross-frames , Finite element analysis , Literature reviews , Computerized simulation , Displacements , Stresses , Ford City Bridge , Inconsistent detailing , Web-plumb condition , I-girder
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