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pdelta analysis of arch using notional load approach
i am working on the pdelta analysis of an arch rib. the fea model i've created is a shallow arch consisting of 24 elements. i'm trying to model the pdelta effects (ignoring pdelta effects)by the notional load approach. i've performed an elastic analysis of the arch and have my initial deflections. my question is how to calculate the notional loads (that will be applied to the nodes of the model)from the moment found by the pdelta of each element. i know there are other methods such as modified newton-raphson that require some mathmatical gymnastics, and i'd rather not go that route, if possible. i've already performed a moment magnification of the elastic model, and wanted to compare it to a pdelta analysis. any help would be most appreciated.

i forgot to say that the arch supports are fixed.

2009-09-15, 11:46 AM	#1
huangyhg 超级版主注册日期: 04-03 帖子: 18592 精华: 36 现金: 249466 标准币资产: 1080358888 标准币	pdelta analysis of arch using notional load approach pdelta analysis of arch using notional load approach i am working on the pdelta analysis of an arch rib. the fea model i've created is a shallow arch consisting of 24 elements. i'm trying to model the pdelta effects (ignoring pdelta effects)by the notional load approach. i've performed an elastic analysis of the arch and have my initial deflections. my question is how to calculate the notional loads (that will be applied to the nodes of the model)from the moment found by the pdelta of each element. i know there are other methods such as modified newton-raphson that require some mathmatical gymnastics, and i'd rather not go that route, if possible. i've already performed a moment magnification of the elastic model, and wanted to compare it to a pdelta analysis. any help would be most appreciated. i forgot to say that the arch supports are fixed. __________________ 借用达朗贝尔的名言：前进吧，你会得到信心! [url="http://www.dimcax.com"]几何尺寸与公差标准[/url]