Dynamic Response of Light Frame Joist Floor Subjected to Impact Force

Abstract

Dynamic tests and direct transient response analyses of finite element method were carried out to demonstrate the vertical dynamic response of light frame joist floor subjected to various impact forces (impact-hammer, heel-drop, clay-drop). The specimen was 3.64m-long-span and 3.64m-wide joist floor consisted of eleven 2" by 8" lumbers and 15 mm-thick T&G plywood subfloor. The test results indicate, i) Dynamic maximum displacement of mid-span of the joist placed in the center of the floor obtained by the finite element method agree with those by experiments, ii) Dynamic maximum displacements closely relate to both the natural frequency of the joist floor and the processing time of impact force. iii) The static calculation using the coefficient (1.4) derived from the direct transient response analyses predicts the dynamic maximum displacements of the joist accepted the impact force.