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

基本信息

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

项目摘要

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-混凝土组合构件的受拉侧混凝土被轻质聚氨酯取代，在低高度桥梁中得到有效使用，因为它有助于减轻桥梁重量。然而，高度较低的桥梁往往容易振动。在研究的第一阶段（2003年），我们验证了聚氨酯的效果，对三座钢-混凝土组合板桥进行了振动试验；两个填充刚性聚氨酯，一个完全填充混凝土。测试结果表明，刚性聚氨酯使阻尼比提高了50％以上。在第二阶段（2004-2005年），我们验证了带有刚性聚氨酯的钢板的振动性能，因为我们认为刚性聚氨酯附着在钢板上可以降低噪音从桥上。我们对不同聚氨酯厚度的钢板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：当我们将高尔夫球掉落在具有 150 毫米厚聚氨酯的 3 毫米厚钢板上时，检查高频区域的振动，阻尼比约为。与不含聚氨酯的钢板相比 4 倍。当我们将一个垒球扔到上面的板上来检查低频区域的振动时，阻尼比约为。 2次。振动台上的振动试验：另一方面，确认了当在振动台上振动带有硬质聚氨酯的钢板时，将聚氨酯附着到钢板上会增加钢板的加速响应。