Abstract
Composite steel box girder bridges have become an effective alternative to conventional plate girders and concrete girder bridges in North America in the past 25 years. A number of ongoing innovations in Canada and elsewhere have the potential of further enhancing the design, durability, constructability, and, by extension, the economics of steel box-girder bridges. The thesis examines number of boxes actually needed, with the aim of reducing the number used at present while meeting all design criteria.
Highlights
The construction of box-girder bridges in interchanges of modem high highway systems has become increasingly popular for economic and aesthetic reasons
This implies 21 span reference points starting from the left end to the right end of the bridge
Summary for Four-Lane Bridge Design This section presents the results for four lane bridge configurations. 4.1.1 Three-Box Girder Bridge Design Results Figure 3.6 shows the cross-section dimensions of the four-lane, three-box girder bridge and longitudinal and transverse reinforcements in the rectangular concrete block within the effective slab width
Summary
The construction of box-girder bridges in interchanges of modem high highway systems has become increasingly popular for economic and aesthetic reasons. Box-girder bridges have the following advantages over typical I-beam bridge systems: (i) low material content, relatively light weight, (ii) high bending rigidity, (iii) composite concrete deck-steel cellular bridges provide significantly high torsional rigidity when compared with open-section bridges, (iv) high stability during the erection process, and (v) high vertical clearance due to the favourable span-to-depth ratio. Composite Conrete-steel section a) Types of single-cell box girders Steel Section. Steel section b)Types of multiple-spine (mUlti-box) box girders
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