Research On Seismic Behavior Of Masonry Structures With Fabricated Tie-columns

Masonry structure is the most popular structural style for buildings in rural areas in China. The abilities of keeping integrality and anti-collapse of masonry structure are vital for improving the seismic behavior of masonry structure in rural areas. It is hard to promote practices of in-situ cast tie-column technology in rural masonry buildings for it is expensive and the construction is complex, etc. Fabricated tie-column technology is effective to solve the problems of in-situ cast tie-column technology and can improve the seismic behavior of rural masonry structure. The major works and findings, around fabricated tie-column technologies in this thesis, are summarized as follows:①Fabricated tie-column technologies developmentBased on the practical situation of input, construction technology and management measures, two kinds of fabricated tie-column technologies are put forward, including core-tie-column technology and precast tie-column technology.②Pseudo-static testes and numerical simulation of masonry walls restrained by core-tie-columnsPseudo-static tests of eleven wall specimens including six specimens restrained by core-tie-columns, two by in-situ cast tie-columns, and three without restraints, were carried out. The failure modes, dissipative capacities, deformation capacities and stiffness degradation behaviors of the specimens were analyzed and contrasted. Some tests of wall specimens restrained by core-tie-columns were simulated by nonlinear FEM.The research results show that, the failure modes are improved, the dissipative capacity and the deformation capacity are improved dramatically, and the stiffness degradation speed is delayed with the restraint effects of core-tie-columns. The core-tie-columns are as effective as in-situ cast tie-columns.③Pseudo-static testes study on walls constrained by precast-tie-columnsPseudo-static tests of five wall specimens restrained by precast-tie-columns were carried out. The failure modes, the dissipative capacities,deformation capacities and stiffness degradation behaviors of the specimens were analyzed and contrasted with wall restrained by in-situ cast tie-columns and without restraints.The research results show that the restraint effects of precast-tie-columns on masonry wall are effective and the walls with precast-tie-columns have better dissipative capacities and deformation capacities.④Shaking table test study of the masonry structural model restrained by core- tie-columnsThe shaking table test of a full scale two-storied masonry structural model restrained by four core-tie-columns, was carried out. The seismic behaviors, including failure mode, dynamic behavior, acceleration responses, displacement responses, deformation capacities and torsion responses etc., were investigated and distinguished. The research results show that the deformation capacity of the masonry structure from crack to serious damaged is improved significantly, the structural integrality is ensured and the collapse resistant capacity is increased with the restraints of core-tie-columns.⑤Design details and practices of fabricated tie-columnThe preliminary design details for core-tie-column technology such as arrangement and reinforcement were proposed. The core-tie-column technology and precast–tie -column 1 technology were used in practical projects.