Anti-cracking structure for hogging moment region of steel beam-concrete slab combined continuous beam bridge
A technology of concrete slab and negative bending moment area, applied in bridges, bridge parts, bridge maintenance, etc., can solve problems such as easy cracking, reduce tensile stress, improve long-term mechanical performance, and facilitate construction.
Inactive Publication Date: 2015-06-24
WUHAN MUNICIPAL ENG DESIGN & RES INST
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[0008] The purpose of the present invention is to provide a steel beam-concrete slab composite continuous girder bridge negative moment zone crack resistance structure, to reduce the tensile stress of the steel beam-concrete slab composite continuous beam negative moment zone concrete slab, improve the strength of the concrete slab Durability, solving the problem of easy cracking in the negative moment zone of existing steel-concrete composite continuous beams
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[0023] Now in conjunction with accompanying drawing, further illustrate how the present invention is implemented:
[0024] The present invention is a steel girder-concrete slab composite continuous girder bridge anti-cracking structure in the negative moment zone, wherein the steel girder L and the concrete bridge deck B of the steel girder-concrete slab composite continuous girder bridge are connected by shear nails 9; the combination The continuous girder bridge is a negative moment zone 1 at the top of the pier Z; the steel girder L is composed of an upper flange plate 4, a web 5 and a bottom plate 6; the concrete bridge deck B is composed of concrete steel bars 7 and concrete 8 components, in the steel girder-concrete slab composite continuous girder bridge, set the expansion joint 2 in the direction of the transverse bridge in the concrete bridge deck B at the top of the negative moment zone 1 at the top of the pier Z in the steel girder-concrete slab composite continuous ...
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The invention relates to an anti-cracking structure for a hogging moment region of a steel beam-concrete slab combined continuous beam bridge, and belongs to the field of bridge engineering. A steel beam and a concrete bridge deck slab of the steel beam-concrete slab combined continuous beam bridge are connected through shearing force nails, and the hogging moment region is at the top of a middle pier; a transverse bridge direction expansion joint is formed in the portion, in the hogging moment region at the top of the middle pier in the steel beam-concrete slab combined continuous beam bridge, of the concrete bridge deck slab, and an expansion type structural body is arranged in the transverse bridge direction expansion joint. By means of the transverse bridge direction expansion joint and the expansion type structural body, the deformation constrain of the concrete section in the expansion joint is reduced, the tensile stress of the concrete slab is reduced, and therefore the problem of cracking of the hogging moment region at the top of the middle pier in the steel beam-concrete slab combined continuous beam bridge is solved. The anti-cracking structure is concise in design and convenient to construct, the transverse bridge direction expansion joint can be formed in a hogging moment region of a newly built bridge, and the anti-cracking structure can be used for solving the problem of concrete cracking of the hogging moment region of the steel beam-concrete slab combined continuous beam bridge.
Description
technical field [0001] The invention discloses a steel girder-concrete slab combined continuous girder bridge anti-crack structure in negative moment zone, which belongs to the field of bridge engineering. Background technique [0002] The steel girder-concrete slab composite continuous girder bridge takes advantage of the tensile properties of steel and the good compressive properties of concrete, and combines the two to work together. Compared with the traditional steel box girder, it has obvious economic and technical advantages. However, for the negative bending moment area at the top of the middle pier of the multi-span steel-concrete composite continuous girder bridge, the concrete slab will be under tension. If the tensile stress is not properly controlled, the concrete in the negative bending moment area of the beam bridge will crack. Reduce the durability of the structure and affect the service life of the bridge structure. [0003] The existing methods to solve ...
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IPC IPC(8): E01D19/00E01D19/06E01D19/12E01D22/00
CPCE01D19/125E01D19/06E01D22/00
Inventor 陈丽军胡宁刘璐文小和张茂会
Owner WUHAN MUNICIPAL ENG DESIGN & RES INST