For details on computing the moment due to the distributed load, see the Appendix at the bottom of this post.įor a static (i.e. Purlins are often used in conjunction with rafter ties (see Appendix below for a figure).įigure 4: Free Body Diagram of the Rafter.Moments are summed about a point on the ridge of the roof. The rafter ties can generate tremendous force on the rafter to which it is connected. The number of ties required per rafter will vary by situation. See a structural engineer if you have a real problem that needs to be solved.įor those who are not familiar with rafter ties, I have included Figure 1 as an illustration of what they are and how they are connected to the rafters. Instead, I am reviewing the basic mathematics and physics used in doing this sort of work. ![]() ![]() Note that this post does not presume to train anyone on how to do structural engineering. I also noticed that the same equation is also built into an online calculator. I became curious where the equation used in this article came from and I decided to derive it myself. I had forgotten about this old farm building until I saw an article in the Journal of Light Construction (JLC) on the problems associated with using rafter ties on a roof. This also was a sign of tremendous tension. I noticed that steel cables has been hidden behind the rafter ties to try to reinforce them, but the screws attaching the cables to the rafters were also pulling out. The rafter ties were clearly pulling away from their rafters because of the tension forces they were experiencing when under snow load. I noticed that the rafter ties had pulled away from the rafters they were nailed to. Version reviewed: 1.5.As a boy, I remember seeing a dilapidated farm building that had a set of rafter ties in its attic. Some free alternatives of this product might be: Carbon Emacs, jEdit, or a lightweight text editor that has less support for syntax highlighting, mi. If you are a developer and you use a text editor for commercial projects, and this text editor helps you to finish your projects faster and easier, then the price isn't an issue. ![]() The price might be a little to high for a regular user. The only thing that disturbed me was the lack of flexibility of the tabbed implementation. I was quite impressed by this piece of software. In conclusion: this is a pretty good text editor. Pluses: it has a great support for programming languages due to its syntax highlighting, it's plug-in-able, it features tabbed interface for files that are part of the same project, it has various built-in tools that make your life easier, it has spell checking.ĭrawbacks / flaws: the tabbed interface works only with the files that are part of the same project, so it doesn't give you the possibility to use it whenever you want to. The editing of individual text files is made into individual windows. It has built-in tabbed editing of the files, but this kind of functionality is available only for the files from the same project. By using this kind of functionality you can easily check whether the Web page that you are currently developing complies with the W3C Web standards or not. For example, TextMate has built in a W3C HTML syntax validator which communicates with the online tool that's provided by W3C. It also features some functionality that you won't find in any text editor. ![]() TextMate has various formatting/converting features. You can check the list of supported types in one of the screenshots that I took during my testing. This kind of support makes this text editor an option for developers. The list of supported languages is decent. I was quite surprised to see that it can highlight the syntax even though I saved the file as '.txt'. The normal text editing is quite irrelevant because even the built-in TextEdit can do a fair job. Since it is a text editor, the first thing that I checked was the syntax highlighting for specific languages. It is fast, it has a well designed interface, and a very good support for various programming languages. Indeed, TextMate is a pretty good text editor. TextMate is referred as the missing text editor on Mac OS X.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |