单层双开间石砌体结构房屋抗震加固振动台试验研究OA

There are a large number of stone masonry houses in Fujian Province.Such houses generally have low masonry mortar strength,small shear bearing capacity of stone walls,and lack of seismic measures,resulting in poor seismic performance.To this end,it was proposed to use ultra-high performance engineering cement-based composite(UHP-ECC)punctate joints to strengthen the stone wall,while adding reinforced concrete surface layer strip-type structural columns and ring beams to further strengthen its overall performance.Two 1/2 scaled unreinforced and reinforced single-layer double-bay stone masonry structure models were designed and fabricated,and then the shaking table test was carried out.The failure modes and dynamic responses of the reinforced and unreinforced models under earthquake were compared and analyzed to verify the improvement effect of the reinforcement method on the seismic performance of the structure.The results show that compared with the unreinforced model,the natural frequency and damping ratio of the reinforced model are improved.Under the earthquake action of different acceleration peaks,the roof acceleration amplification coefficient of the reinforced model is reduced by 28.76％on average,the inter-story displacement angle is reduced by 61.62％on average,and the plane torsion angle is reduced by 74.42％on average.Under the 7 degree(0.10g)fortification ground motion,the maximum inter-story displacement angle of the unreinforced model reaches 1/383,which is close to the serious damage degree.Under the action of 7 degree(0.15g)fortification earthquake,the maximum interlayer displacement angle reaches 1/123,and the local wall has serious out-of-plane damage,and the structure has reached the collapse degree.Even under the action of 8 degree rare earthquake,the maximum inter-story displacement angle of the reinforced model is only 1/347,which reaches the moderate damage degree,and the integrity of the structure remains intact.Therefore,the seismic performance of the structure can be significantly improved by using the reinforcement method of UHP-ECC point-like caulking to reinforce the stone wall and adding strip-type structural columns and ring beams on the surface layer.