STUDY ON TRANSVERSE ANTI-SEISMIC STRUCTURE AND PARAMETER SELECTION OF SLENDER STRAIGHT PIPE SUPPORT

Compared with the longitudinal mechanical properties, the transverse mechanical properties of the slender straight pipeline system are particularly important for the stability of the pipeline. The transverse seismic performance of slender straight pipe support was studied. Considering the influence of connection mode on the seismic performance of the pipe support, and the pipe support and the bottom foundation were bolted and welded, two specimens, i.e., SJ1 and SJ2, were designed for quasi-static tests, and the finite element model of the pipe support was established. On the basis of the finite element model, the detailed structural parameters of the pipe support considering the connection mode, the structural form of the middle panel and the number of ribs are analyzed, and finally the structural parameters of the pipe support with good seismic performance are obtained. The results show that the bolted bracket members fail to give full contribution to the seismic performance of the bracket structure because the bolts are easily pulled up. Compared with the bolt connection, the hysteresis curve of the welded pipe frame and the bottom foundation is relatively plump, with higher skeleton curve and stronger energy dissipation capacity, indicating a relatively good seismic performance. The skeleton curves and energy dissipation capacity curves of the bracket structures with different middle panel structure forms have little difference, with similar stiffness degradation law. A larger number of vertical ribs leads to enhanced buckling resistance of pipe support members, with the bearing capacity and energy dissipation capacity being significantly improved. When the number of vertical ribs is 2, it leads to better bearing capacity, strength, stiffness, energy dissipation capacity, and better seismic performance of the supports.