Response of Rate-Sensitive Frames to Impulsive Load

by Nicholas Perrone, Dir.; Struct. Mech. Program, Ofc. of Naval Res.; also Adjunct Prof. of Mech., Catholic Univ. of America, Washington, D.C.,

Serial Information: Journal of the Engineering Mechanics Division, 1971, Vol. 97, Issue 1, Pg. 49-62

Document Type: Journal Paper

Abstract: The response of frames made of rate-sensitive material and subjected to high intensity loading is determined in an approximate way by utilizing modal approximations and plastic hinges with an effective length of 3 beam depths. An initial modal deformation pattern is assumed and a tentative associated solution obtained. Should the solution turn out not to be valid (or safe), a new modal pattern is assumed and the process repeated. The square portal frame under horizontal impulsive impact is treated in detail. The results show that if the impulsive velocity is less than some limiting value, a simple side sway motion is the correct one; if this critical velocity is exceeded the horizontal member bows out due to centrifugal inertia force. Extension of the technique analyzed here to account for strain hardening and pressure pulse loading on frames is also considered.

Subject Headings: Frames | Plastic hinges | Impulsive loads | Material properties | Load factors | Approximation methods | Effective length |

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