Seismic behavior of a new fabricated concrete grating composite wall structure in rural residences: Shaking table test and finite element analysis

Abstract

To promote the application of prefabricated concrete structures in the field of rural residences, this paper proposes a new fully fabricated concrete grating composite wall structure (FFCGCW). A 2:3 scaled single-story model with door and window openings was designed, and a shaking table test was carried out to study the seismic performance of the FFCGCW structure. Three types of seismic waves were selected to analyze the failure modes, dynamic response, displacement response, strain response, and acceleration response of the structure under four peak ground accelerations (PGAs). The experimental results indicated that the FFCGCW structure had a large stiffness and could work in an elastic state at PGA = 0.4 g. At PGA = 0.8 g, the maximum inter-story drift was 1/600, and the natural frequency decreased by 9.4 %. The structure just entered a plastic state, and no overall failure occurred when loaded to 0.8 g. The cracks mainly occurred on the concealed beam at the upper end of the window, the corner of the door opening, the floor slab, and the column base, but they did not continue to develop and no collapse occurred. Compared to cast-in-situ concrete structures, FFCGCW structural components use bolt-connected keyed joints, which are convenient for construction and have similar seismic performance. During the earthquake, the bolt gaskets constantly deformed, the pre-tightening force of the bolt decreased, and the keyed joints allowed for mutual displacement between structural components to dissipate energy. Meanwhile, a simplified shell-element finite element (FE) simulation method was proposed for the grating wall, and the experimental data was verified by the FE analysis, with errors within 10 %.