Experimental Study on Bearing Capacity of Compression Members of Space Grid Structures Reinforced by RPC

Insufficient bearing capacity of compression bars in space grid structures can significantly reduce the collapse resistance and cause immeasurable losses. Reactive powder concrete (RPC) with high strength, micro-expansion, good ductility is used to reinforce members by infilling steel tubes. Axial tests on five types high-frequency welded pipes different section sizes initial stresses were carried out. The results showed that compared tubes alone, reinforced RPC could be increased 75.77 218.34%. With a decrease either stress or confinement coefficient, contribution material reinforcement increased. failure mode specimen after grouting was same as non-reinforced pipe, which dominated elastic-plastic buckling. hole did not fail prior instability member, suggests necessary measures repair should taken. Based design method axial concrete-filled tubular six codes China abroad, test this paper 242 RPC-filled analyzed. Finally, an equation nominal capacity, estimates ultimate compressive strengthened filled structures, proposed.