Kapil,
The question is simple, but the answer is exceedingly complicated and results from years of study and field validation. Blast resistant design is dynamic design on steroids.
First, as I indicated in my September 25th response, you need to be using the UFC 3-340-02 which replaced the TM 5-1300 last year. Following is the link to the UFC 3-340-02:
http://www.wbdg.org/ccb/DOD/UFC/ufc_3_340_02.pdf
The UFC 3-340-02 is a 1,943 page document that contains a step by step example of a double leaf door. Please reference my September 25 response for the exact reference to the appropriate section of the UFC 3-340-02 for the double leaf door.
The UFC 3-340-02 provides straight forward solutions predicated on the work of engineers who have studied and tested blast resistant structures for decades. If it is not covered in the UFC 3-340-02, you will need to go back to the fundamentals presented in Biggs, develop your hydrocode computer modeling program, design the door, construct the door, set the door in a reaction structure, detonate a device to create the design air blast, capture the overpressure and response data, and validate your design. Count on about 5 years and about 25 million dollars in R&D after you clear the security issues.
To your specific question. The stiffened double leaf door does not reference yield line. If you are looking at a solid plate element, reference UFC 3-340-02, page 5-29 for a discussion on yield line assumptions.
There are specialty door companies that provide this service.
It is a complicated field of study.
Regards, Harold Sprague
> Date: Fri, 2 Oct 2009 09:44:45 -0400
> Subject: Blast Doors : Door Edge Rotation and Yield Lines
> From: kapil.nandwana@gmail.com
> To: seaint@seaint.org
>
> Hi :
>
> I am designing a blast door using TM5-1300 manual. It's is double
> leaf blast door, and can be supported on two or three sides.
>
> My question is : How should I calculate the door edge rotation angle
> for a two side support and three side support ?
>
> In addition to edge rotation, I am also in doubt for how to select the
> yield lines for 2 sides supported and three side supported door ?
>
> How do I determine which option to choose while starting the analysis.
> How would I know later that I chose a wrong yield lines ?
>
> Thanks
>
> Kapil , Structural Engineer, EWI
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