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 (2) However, as long as there is insufficient data to accurately
describe the behavior of built-up doors (which is somewhere between one- and
two-way element behavior), it is recommended by Keenan to design them as
one-way elements if the configuration is similar to the typical built-up
blast door described above. Figure 72 illustrates a typical built-up blast
door and Figure 73 shows additional blast door details.
(3) Generally speaking, the design of blast doors using any of the
current state-of-the-art methods, would result in a door with a capacity
greater than that predicted by the analysis since the effects of membrane
action are neglected. An analytical approach has been proposed by Warren
et al. which might be useful for design of blast doors. The proposed
method is essentially the same as that used in Computer Program SDOOR
(Section 8 of this manual) except in the calculation of the built-up door
properties. However, as stated by Warren, this approach must be validated
by additional experimental and detailed analytical efforts.
(4) A problem solution is presented in paragraph 6.b, of this
section, for predicting the response of a built-up door.
5. DOOR FRAME. The door frame should be designed to withstand the shear
from the blast door and the loads induced by the hinges during the rebound
phase of the door. The frame should also be able to transfer this shear to
the surrounding walls and this is achieved through anchor rods and
"cadwelds". The design of a typical door frame is best illustrated by an
example which is presented in paragraph 6.c of this section.
6.
EXAMPLE PROBLEMS.
a.
Design of a Solid Steel Door.
Problem:
Design a solid steel-plate blast door subjected to a
pressure-time loading.
Given:
(1) Pressure-time loading.
(2) Design criteria ([theta]max and [mu]max for a
reusable or non-reusable structure).
(3) Structural configuration of the door including geometry
and support conditions.
(4) Properties of steel: Minimum yield strength, Fy, and
dynamic increase factor, c.
Solution:
(1) Select thickness of plate.
(2) Calculate the elastic section modulus, S, and the plate
section modulus, Z, of the plate.
2.08-272
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