Construction method of long-span composite beam bridge with steel truss and corrugated steel web

Abstract

The invention discloses a construction method of long-span composite beam bridge with steel truss and corrugated steel web. The steel truss and corrugated steel web beam segment is arranged outside the fulcrum lining concrete segment in the bridge. The steel truss and corrugated steel web beam segment can effectively share the shear load of beam segment, prevent buckling instability of corrugatedsteel web and structural damage, meet the design requirements of long-span corrugated steel web beam bridge, and solve the problem of large shear of corrugated steel web of long-span corrugated steelweb bridge lining outer beam segment. Accordingly, the inventors also established corresponding construction methods. The invention is applicable to the design and use of beam bridges with spans of 160m and above, and has certain engineering significance and great economic value.

Description

technical field [0001] The invention belongs to the field of transportation bridge and culvert engineering, in particular to a steel truss-corrugated steel web long-span composite girder bridge and a construction method thereof. Background technique [0002] As the span of the bridge increases, the height of the section steel web near the fulcrum of the corrugated steel web is also increasing, and buckling failure is prone to occur. In general engineering, lining concrete is used to restrain the corrugated steel web near the fulcrum. plate to prevent segmental buckling. "Guangdong Provincial Code" (DB44 / T1393-2014 Article 7.2.2) pointed out that the net height of corrugated steel web should be less than 5m to prevent web buckling instability. However, with the increase of the bridge span, under the constraints of the support height-span ratio of 1 / 15-1 / 17, when the span reaches more than 180m, the net height of the corrugated steel web at the fulcrum reaches 9-10m, The web...

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Problems solved by technology

However, with the increase of the bridge span, under the constraints of the support height-span ratio of 1 / 15-1 / 17, when the span reaches more than 180m, the net height of the corrugated steel web at the fulcrum reaches 9-10m, The web in the negative moment area is super high, prone to buckling instability, which becomes the limiting condition for the development of this type of bridge span, and setting too long a lining concrete section will increase the self-weight of the bridge, and lose the possibility of setting corrugated steel webs. significance

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