Research on Application of Steel-Concrete Composite Members filled with Rigid Urethane to Structures

硬质聚氨酯填充钢-混凝土组合构件在结构中的应用研究

• 批准号: 15560419
• 负责人: OTA Teiji
• 金额: $ 2.37万
• 依托单位: Takamatsu National College of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560419/
• 关键词: Rigid Urethane; Steel-Concrete Composite Bridge; Vibration Test; Damping Ratio; 振動減衰; 鋼コンクリート合成床版橋; 現場振動計測

Steel-concrete composite member, the tension side concrete of which is replaced with light weight urethane, is used efficiently in low height bridges because it helps to reduce bridge weight. However, low height bridges tend to vibrate easily. In the first stage of the research (in 2003), we verified the effect of urethane, performing vibration tests on three steel-concrete composite slab bridges ; two filled with rigid urethane and one filled completely with concrete. The test result showed that rigid urethane increases damping ratio by more than 50 percent.In the second stage (in 2004-2005), we verified vibration property of steel plates with rigid urethane because we thought that rigid urethane attached to steel plates could reduce noise from the bridge. We performed two kinds of vibration tests (impact loading test and vibration test on a shaking table) on steel plates with various urethane thickness.Impact loading test : When we dropped a golf ball on a 3mm-thick steel plate with 150mm-thick urethane to check vibration in high-frequency region, damping ratio was approx. 4 times comparing a steel plate without urethane. When we dropped a softball on the above plate to check vibration in low-frequency region, damping ratio was approx. 2 times.Vibration test on a shaking table : On the other hand, it was confirmed that attaching urethane to steel plates increases the acceleration response of steel plates when vibrating steel plates with rigid urethane on a shaking table.

钢-混凝土组合构件是以轻质聚氨酯代替受拉侧混凝土的一种结构形式，它能有效地减轻桥梁的自重，在低高度桥梁中得到了广泛的应用。然而，低高度的桥梁往往容易振动。在研究的第一阶段（2003年），我们验证了氨基甲酸乙酯的效果，在三个钢-混凝土组合板桥上进行了振动试验;两个填充刚性氨基甲酸乙酯，一个完全填充混凝土。第二阶段（2004-2005年），我们认为刚性聚氨酯附着在钢板上可以降低桥梁的噪声，因此对刚性聚氨酯钢板的振动特性进行了验证。在聚氨酯厚度不同的钢板上进行了两种振动试验（冲击载荷试验和振动台振动试验）。冲击载荷试验：将高尔夫球落在聚氨酯厚度为150 mm的钢板上，检查高频区域的振动时，阻尼比约为1.5。与不含氨基甲酸乙酯的钢板相比增加了4倍。当我们把一个垒球放在上面的板上以检查低频区域的振动时，阻尼比约为。振动台上的振动试验：另一方面，当在振动台上振动具有刚性聚氨酯的钢板时，确认了将聚氨酯附着到钢板上增加了钢板的加速度响应。