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5.12全国防灾减灾日|National disaster prevention and mitigation day

全国防灾减灾日

是经中华人民共和国国务院批准而设立,自2009年起,每年5月12日全国防灾减灾日。一方面顺应社会各界对中国防灾减灾关注的诉求,另一方面提醒国民前事不忘、后事之师,更加重视防灾减灾,努力减少灾害损失。

防灾减灾日的图标以彩虹、伞、人为基本元素,雨后天晴的彩虹韵意着美好、未来和希望,伞的弧形形象代表着保护、呵护之意,两个人代表着一男一女、一老一少,两人相握之手与下面的两个人的腿共同构成一个“众”字,寓意大家携手,众志成城,共同防灾减灾。整个标识体现出积极向上的思想和保障人民群众生命财产安全之意。

今年5月12日是我国第12个全国防灾减灾日,主题是“提升基层应急能力,筑牢防灾减灾救灾的人民防线”。

地震自救
2008年5月12日汶川大地震

 

虎门大桥起伏晃动的罪魁祸首原来是它?

5日下午,广东虎门大桥发生异常抖动,部分桥面出现上下起伏、如波浪般抖动的小视频刷屏朋友圈:

不少过往群众也表示,整个大桥像波浪一样“起起伏伏”地摇晃。

专家组连夜研判,虎门大桥振动原因初步判定是它……

据广东省交通集团通报称,专家组初步判断,虎门大桥悬索桥本次振动主要原因是:沿桥跨边护栏连续设置水马,改变了钢箱梁的气动外形,在特定风环境条件下,产生的桥梁涡振现象。

虎门大桥大修办公室副总工程师张鑫敏表示:“我们现在分析的主要原因是,可能当时我们在做桥面检修的工作,沿着护栏立柱摆了一层水马,摆了水马以后,相当于把护栏立柱的透风孔给堵住了,通过专家的会议和意见,觉得是水马对桥梁的外形、抗风的外形产生了变化,所以产生了涡振。

桥梁涡振现象是如何产生的?

著名桥梁专家、虎门大桥工程顾问、西南交通大学教授强士中解释说,桥梁的截面呈流线型,迎风面的风吹过之后,是不会产生漩涡的。但是,当这个形状改变了,风通过横截面之后,会在背侧形成漩涡,从而加大桥梁的压力。在桥梁上加一个水马等小型物件,没有很大影响,但连续性的物体,会使整个横截面形状被改变。

水马,是个啥?

水马,是一种用于分割路面或形成阻挡的塑制壳体障碍物。通常是上小下大的结构,上方有孔以注水增重,部分水马还有横向的通孔以便通过杆件连接以形成更长的阻挡链或阻挡墙。

水马一般用于道路交通设施,在高速路、城市道路及天桥街道路口常见。

水马,是一种用于分割路面或形成阻挡的塑制壳体障碍物。通常是上小下大的结构,上方有孔以注水增重,部分水马还有横向的通孔以便通过杆件连接以形成更长的阻挡链或阻挡墙。

水马一般用于道路交通设施,在高速路、城市道路及天桥街道路口常见,它长这样.

Question:

桥面是水平的,风也是水平吹过来的,为什么会发生上述扭转的摆动,导致最后桥的坍塌呢?

Answer:

由于在风的作用下产生的“卡门涡街”,涡作用以后使得桥面周期性出现上下的作用力。

卡门涡街示意图:

“卡门涡街” 相关视频

https://haokan.baidu.com/videoui/page/search?query=%E5%8D%A1%E9%97%A8%E6%B6%A1%E8%A1%97