Abstract：
The explosion pressure is simplified as the triangular shock load, which is applied to the bottom surface of a span of 24m×36m gas station is four square pyramid space truss structure, using SAP2000 finite element method, analysis of dynamic response of space truss structure. The results showed that: the longitudinal and transverse truss joint displacements are bigger in the middle than both sides, each joint acceleration began to fluctuate after the explosion occurred over a period of time, then grew larger, and the corner joint fluctuation frequency is significantly higher than other joints, under blast loading, most of the upper chord bars are tension, part of the bottom chord bars are tension, part of the bottom chord bars are compression, and the stress of bottom chord bars is bigger than the upper chord bars, the middle chord bars axial force of the side span are smaller than on both sides of chord bars, the middle chord bars axial force of the middle span are bigger than on both sides of chord bars.
