A simple model of a one-story frame structure is shown in Figure P11.30(a). Use one beam element to model each of the columns and two bar elements to model the girder. Determine the response of the structure if it is subject to the blast force of Figure P11.30(b).

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2.5 m FIGURE P11.30 5.1 m 2000 kg E = 200 10 N/m p=7500 kg/m A 3.1 102m I=1.7 10-5 m (1) F(N) 7000 (b) 0.08 I(s)