一种垫高阻尼减振性能好的钢箱梁

Abstract

本实用新型公开了一种垫高阻尼减振性能好的钢箱梁，包括顶板，顶板下端面具有腔体，顶板下端面从上到下依次铺设有位于腔体内部上端的垫高层、阻尼层和约束层，并且垫高层、阻尼层和约束层三者通过若干穿接于内部的固定件固定于顶板上，垫高层材质为发泡阻尼材料。本实用新型显著提高钢箱梁的阻尼比和振动能量耗散性能，垫高层为发泡材料，其内部大量闭孔气泡构成多谐振子系统，闭孔气泡在声压作用下产生受迫振动以将机械能转化为气泡内的热能，同时引发聚合物骨架的周期性形变以降低钢箱梁刚性骨架结构的振动幅度；阻尼层在钢箱梁振动形变时能够有效吸收振动能量；不需要额外在钢箱梁的腔体内部或钢箱梁外部加装阻尼器，即可达到等效的减振功能。

Claims

1. A steel box girder with good cushioning damping performance, characterized in that, Includes a top plate (1), the lower end face of which has a cavity (2), the lower end face of which is sequentially covered with a padding layer (3), a damping layer (4) and a restraint layer (5) located inside the cavity (2) from top to bottom, and the padding layer (3), the damping layer (4) and the restraint layer (5) are fixed to the top plate (1) by several fasteners (6) passing through the interior, the padding layer (3) being made of foamed damping material.

2. The steel box girder with good damping vibration damping performance of the cushion, according to claim 1, characterized in that, The thickness ratio of the padding layer (3), damping layer (4) and constraint layer (5) in the longitudinal direction is 5:1:1, and the total thickness of the three in the longitudinal direction is ≤ 1 / 10 of the height of the cavity (2).

3. The steel box girder with good damping and vibration reduction performance as described in claim 2, characterized in that, The padding layer (3) is directly processed and molded into the upper part of the cavity (2) using a foaming process, and the lower end face of the top plate (1) located inside the cavity (2) is coated with an aging-resistant adhesive for bonding the padding layer (3).

4. The steel box girder with good damping vibration damping performance of the cushion, according to claim 3, characterized in that, The material of the padding layer (3) is one of polyurethane foam, modified phenolic resin foam, and polyisocyanurate foam, and the aging resistant adhesive is one of high-performance polyurethane adhesive, modified epoxy resin adhesive, and high-strength silicone rubber adhesive.

5. The steel box girder with good damping vibration damping performance of the cushion, according to claim 1, characterized in that, The damping layer (4) is made of one of polyurethane rubber, butyl rubber, and chloroprene rubber; the constraint layer (5) is made of one of Q355C steel plate and AZ150 aluminized zinc plate; and the top plate (1) is made of Q355C steel plate.

6. The steel box girder with good damping vibration reduction performance of any one of claims 1-5, wherein, The fastener (6) includes a screw (6-1) and a pad (6-2). The lower end of the screw (6-1) has an end cap (6-1a). The upper end of the screw (6-1) passes through the constraint layer (5), the damping layer (4), and the pad layer (3) in sequence and is screwed and fixed in the corresponding screw hole on the top plate (1). The pad (6-2) passes through the lower end of the screw (6-1) and abuts against the end cap (6-1a) and the constraint layer (5).

7. The steel box girder with good damping vibration damping performance of the cushion, according to claim 6, characterized in that, The upper end of the screw (6-1) is also welded and fixedly connected to the top plate (1).

8. The steel box girder with good damping vibration damping performance of the cushion, according to claim 7, characterized in that, Several ribs (1-1) are fixedly provided at intervals on the lower end face of the top plate (1) and the inner wall of the cavity (2).

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