课程设计英文版.docVIP

1, the design of the original data A three-span simply supported beam bridge , using column pier piles , U -shaped abutment . 1 . Bridge clearance Bridge clearance : 11 +2 × 0.75m 2 . And the total length of the main beam path Standard path: 20.00 ( pier center distance ) ; Calculated span : 19.50 ( bearing center distance ) ; Main Beam Length: 19.96 ( main beam prefabricated length). 3 . Design load Road -I level loads , the crowd 3.5kN / m 4 . Material Main Beam : Concrete C40, bulk density 26kN/m3 5. Structure size Reference to the original standard size chart , choose l as shown in the drawings , in which beams with five . 6. Design basis ( 1 ) Highway Bridge Design Specifications pass thrown (JTG D60-2004), referred to as bridge rules ; ( 2 ) reinforced concrete and prestressed concrete highway bridge design specifications (JTG D64-2004), referred to as public pre- regulation ; The first chapter section design 1.1 main beam and the main beam spacing clip The girder spacing should generally increase with height and span beam widened as the economy , while widening the wing to improve the efficiency of the main indicators of effective beam section , placed under the license conditions should be appropriately widened T beam flange . The design of the main beam flange width of 2500mm, due to the width of the larger force to ensure the overall performance of the bridge, the bridge cast concrete panel with rigid joints. Net -11 +2 × 0.75 wide bridge using five main beam . 1.2 main beam cross -section main dimensions proposed in ( 1 ) Main beam height Increasing the beam height can save the amount of prestressing steel beams , high beams simultaneously increase generally only heightening the web , and the amount of concrete to increase much. The design of the main beam access to 1700mm height . ( 2 ) the size of the main beam section detail T beam flange thickness depends mainly on the bridge deck to withstand load wheels local requirements , but also consider th