tag:blogger.com,1999:blog-136645512024-02-20T17:30:35.059-05:00I am using this page to document my efforts with FEA of restrained shrinkage of concrete bridge decks. The work is a part of my dissertation and is ongoing.Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-13664551.post-1123165049787424952005-08-04T08:57:00.000-05:002005-08-10T17:45:19.363-05:00

I've been putting my efforts into developing my finite element model that simulates the behavior of the restrained shrinkage models constructed and tested by Radabaugh (Radabaugh, 2001). The specimens were 9' by 9' reinforced slabs constructed fully composite with W12x65 girders. Radabaugh construced two specimens whose only difference was in the type of formwork that was used in construction.

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com2tag:blogger.com,1999:blog-13664551.post-1121891978708807352005-07-20T15:13:00.000-05:002005-08-04T08:53:50.866-05:00

I have been spending alot of my time recently, trying to ensure that the model will simulate cracking correctly. I began by using a simple fixed-fixed model, as shown below. The model uses ANSYS SOLID65 nonlinear concrete solid elements to model the concrete and LINK8 3D spar elements to model a single piece of reinforcement. The reinforcement is modeled deiscretely rather than using the

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com5tag:blogger.com,1999:blog-13664551.post-1119970729863964722005-06-28T09:31:00.000-05:002005-06-28T10:08:22.710-05:00

I came across an interesting problem while doing some preliminary models. I was modeling a cantilever member (10" x 10" x 60"). I had fixed the nodes at one end for all DOFs and applied a temperature change of 50 F. One would expect the stress in the member to be uniform and approximately zero. However, the plot of the stresses in the long dimension of the member showed there to be some variation

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com0tag:blogger.com,1999:blog-13664551.post-1118929670232528812005-06-16T08:44:00.000-05:002005-06-16T08:48:36.713-05:00

I thought it best to make a post that would contain assorted references. I'll post references as I use them on the site in the comments in this post. As an aside here, I'll only post the references that I make mention to on this site. If you feel that there is a reference that you feel I should consider/mention/look into, please drop it into the comments under this post.

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com2tag:blogger.com,1999:blog-13664551.post-1118929429876618552005-06-16T08:34:00.000-05:002005-06-16T08:43:49.886-05:00

Within the comments of this post I'll discuss my free-shrinkage modelling efforts. Using ANSYS I made models of laboratory specimens used as a part of the work by David Blackman (Blackman 2002). See the comments for more details, to drop in your opinion, or to tell me I'm completely wrong.*Note* I will be adding content to the comments over time, so be sure to check back from time to time if

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com0tag:blogger.com,1999:blog-13664551.post-1118774097273059872005-06-14T13:34:00.000-05:002005-06-14T13:39:17.476-05:00

Transverse crack likely caused by restrained shrinkage of the concrete deck by the steel girders Photo taken by Jacob Bice (2003)

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com0tag:blogger.com,1999:blog-13664551.post-1118773597801199502005-06-14T13:19:00.000-05:002005-06-14T13:39:59.420-05:00

Naturally, the first question is, "Why try to model restrained shrinkage of concrete?" It is a well established fact that concrete shrinks and because of restraint subsequently cracks. Concrete design codes have addressed control of shrinkage cracks since the 1920s. Current code design provisions are essentially unchanged since the 1940s. However, the codes in their present state are:1) Entirely

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com0tag:blogger.com,1999:blog-13664551.post-1118757254983841592005-06-14T08:47:00.000-05:002005-06-14T13:40:30.740-05:00

I created this site to document my efforts at finite element analysis of concrete bridge decks. Specifically, I am interested in modeling the restrained shrinkage of the decks and determining the the effect on global behavior of various design characteristics of the bridges. This work is apart of my dissertation research and is ongoing. This site is by no means an "expert" site but rather an

Erin and Jakehttp://www.blogger.com/profile/00342247133568016102noreply@blogger.com2