Safety concerns have restricted traffic over the main freeway bridge through downtown Cleveland, near the area where Design World magazine is published. Now we are finding out that the crisis was revealed by an FEA analysis of a four-sided steel beam on the Inner Belt Bridge over Interstate 90 in downtown Cleveland. The story was written by reporter Karen Farkas of the Plain Dealer.
ABAQUS FEA用于执行下部弦和角撑板的三维非线性应力分析，显示在克利夫兰的内带I-90桥上叠加。
图片由Simulia Erie Office提供。
图像指示桥梁和弦在极端压力下，不再支持在I-90上的八个车道跨度上的全部流量。如果和弦失败，整个桥都可能会崩溃。因此，俄亥俄州的运输部（臭臭）立即关闭外部车道以减轻桥梁的重量。一天后，两个车道被关闭了。如今，每个方向的外部车道保持闭合，并且禁止卡车使用桥梁。
The 3D computer technology convinced the state agency to scrap a plan to spend $240 million to rehab the 50-yr-old bridge. Instead, the bridge will be demolished in 2014 and replaced by a new span.
The Inner Belt bridge likely is the most analyzed bridge in the US, says ODOT. The 3D imaging that detected the chord problem was used to examine the structure’s more than 7000 beams. Bridge data, including calculations from the original plans when the structure was built and measurements of the current steel beams, were entered into a computer. Results were compared to inspections and load and stress tests on the bridge.
This was one of the largest trusses of its type still in existence and in need of a major overhaul. Even though visual inspections and ultrasonic thickness tests had documented the bridge’s condition, no one knew before the analysis that the chord was overstressed.
This simulation was one part of a larger engineering project directed by ODOT involving various engineering companies. The engineering team at Simulia’s Erie office used their Abaqus FEA software to perform a structural analysis of the Inner Belt I-90 Bridge for ODOT. The analysis included geometric and material nonlinearities (the steel properties in Abaqus included elastic and plastic behaviors).
模拟非线性的能力和建模铆接连接是奥特别多多使用ABAQUS的最重要因素。ABAQUS的后处理能力 - 包括创建自由体切割的能力和支持3D分析的内脏工程师的切割，以便可视化应力型材，变形的地块和潜在的屈曲模式，这有助于他们更好地了解了修复决策。总的来说，能够看到3D的非线性应力结果，这有助于工程师能够更好地理解在桥梁结构中发生的应力和变形。
Dassaultsystèmessimulia.
www.simulia.com.
Filed Under:FEA软件,模拟,软件
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