peter236

http://news.mingpao.com/20120825/caa4.htm

港專家估計：超載車撞橋致塌

【明報專訊】本港工程師學會前會長朱沛坤在參閱部分大橋倒塌照片後表示，估計塌橋有可能與貨車超載貨物及失控有關。他解釋，部分相片顯示大橋上有多條車胎滑行痕舻，而連同橋面一同倒塌、當時正在行走的重型貨車，亦盛載覑不少建築物料和石粒。因此，不排除貨車超載失控，向橋的一邊衝撞，衝力大得拖垮整座大橋的其中一段，甚至連「啤令」也扯歪了。而若重型貨車正常在大橋上行走，即使負荷過重，亦未必會造成塌橋。

他續說，從相片上觀察，哈爾濱的陽明灘大橋採用抗地震設計，路面採用石屎構造、橋底則採用鐵片，由一小段一小段接駁，以橋樑作支撐，該設計在大地震下也不會出現整條大橋一同倒塌，與內地不少抗震的大橋設計相似。他目前未能估計工程是否有偷工減料引致大橋倒塌，因為需要檢驗大橋石屎及鋼筋等建材。

內地專家：整塊傾覆不似豆腐渣

另據內地財新網引述哈爾濱工業大學交通學院副院長王宗林分析，因該段橋樑設計載重為單向50噸，而事故發生之前，估計3輛大貨車嚴重超重，每輛載重約120噸，另一輛貨車載重約30噸，總體重量可能已接近400噸。他懷疑4輛貨車當時停留在引橋慢線，意圖避開檢查，導致橋樑被壓塌。

研究橋樑檢測、加固與安全評估的哈工大交通學院副教授陳少峰，認為傾覆的橋體上部、下部、周圍都沒有問題，且橋板是整塊傾覆，下墜後也沒有發生斷裂，說明質量應該合格。

明報記者

peter236

回復  peter236

Peter, good work!! Glad you've got a good article this time.

BTW, back to the accident.

Certainly overloading is a factor. But that still can't sum up to the failure of an year old heavily designed bridge.

What's your opinion though?
Hint: something to do with the construction schedule, inspection, or minor design default...
lo_pak 發表於 2012-8-24 14:27

It probably has something to do with the standard requirements. If the bridge meets this standard then it is not 豆腐渣. But the thing is that if the standard requirements is set too low, then meeting this standard is not enough.

Big trucks are overloaded in China. It happened before when a couple of extremely overloaded trucks line up on one aide of a bridge. So how much safety margin you need to build into the standard requirements? Do you set the standard requirement so that the bridge can tolerate a traffic jam full of extremely overloaded trucks?

peter236

回復  peter236

Peter 哥…， 莫非你意為北美洲既標準會低得過大陸?

非也…

中間有一樣野叫"量力而為 ...
lo_pak 發表於 2012-8-24 20:46

The reason of this case is several very overloaded trucks all line up on one side of the bridge section, in an attempt to avoid the weight inspection. These trucks are all several times over the legal limit.

There is no way the Port Mann bridge can support several overloaded trucks few times the legal limit, all parked on one side, at the same time.

peter236

回復  peter236


nope!
all steel bridges are hold by W-beam!
don't say no! coz i m a steel detailer ...
jiujiujiu 發表於 2012-8-26 00:46

Who cares what beam they use? The bridge will break if very overloaded.