Failure mode of CFRP grid and its control method based on Pushover analysis

The self-weight and its induced internal force of a long span space structure remarkably increase with increasing span, thus the spanning ability of these structures is limited. This problem can be solved by using carbon fiber reinforced plastic (CFRP) instead of conventional steel in construction of long span space structures. Thus in this paper,space structure is proposed to be constructed fully by CFRP. The seismic capacity, failure mode of the structure under strong earthquakes and its control method of CFRP grid are investigated based on the pushover analysis. First, the pushover analysis method for the CFRP grid under vertical load and considering multi-mode is addressed. After that, a square pyramid space grid is utilized to address the failure criteria, failure mode and its control method of the CFRP grid under four types of loads ,i.e. one directional horizontal load, two directional horizontal load, vertical load and three directional load. The analysis results indicate that the failure modes of CFRP grid are affected by the method modeling the bearings of the grid. The key criteria controlling failure mode of CFRP grid under limit earthquakes is that keeping the horizontal displacement of the grid smaller than the horizontal displacement limit of the bearing.