Study on Seismic Performance of Masonry Walls Reinforced with Ultra-high Ductile Concrete
To investigate the seismic performance of masonry walls reinforced with ultra-high ductile concrete (UHDC),low-cycle repeated loading tests were conducted on two solid walls and two cavi-ty walls. The results showed that,compared to unreinforced walls,the load-bearing capacity of the solid walls and cavity walls increased by 31％ and 223％,respectively,while the peak displacement decreased by 30％ and 471％,respectively. The UHDC-reinforced masonry walls were modeled us-ing OpenSees software to assess the impact of various factors on seismic performance,including re-inforcement layer thickness,reinforcement mode,and axial compressive stress. The results indicat-ed that,for solid walls,when the reinforcement layer thickness was 10,20,and 30mm,the peak load-bearing capacity increased by 16.0％,36.2％,and 56.1％,respectively,while the peak dis-placement decreased by 28.3％,26.7％,and 26.7％,respectively. For cavity walls,the peak load-bearing capacity increased by 117.4％,179.5％,and 243.4％,respectively,and the peak displace-ment increased by 345.5％,522.7％,and 506.1％,respectively,when the reinforcement layer thickness was 10,15,and 20mm. When the axial compressive stress was 0.6 MPa and 0.9 MPa,the peak load-bearing capacity of solid walls increased by 16.8％ and 33.0％,respectively,com-pared to 0.3 MPa,while the peak displacement decreased by 12.0％ and 16.0％,respectively. Com-pared to 0.15 MPa,the peak load-bearing capacity of cavity walls increased by 6.5％ and 10.5％,with peak displacement increasing by 2.8％ and 0.0％,respectively. When full-surface,oblique strip,and orthogonal strip reinforcement methods were used,the peak load-bearing capacity of solid walls increased by 36.2％,12.0％,and 5.4％,respectively,with peak displacement decreasing by 26.7％,28.3％,and 28.3％,respectively. For cavity walls,the peak load-bearing capacity in-creased by 179.5％,80.1％,and 39.3％,respectively,with peak displacement increasing by 522.7％,203.0％,and 203.0％,respectively. Finally,a formula for calculating the shear bearing capacity of UHDC-reinforced masonry walls was proposed,which showed reliable accuracy when compared with experimental and simulation results. The formula provides theoretical support for re-inforcement design.
万方数据
维普
