摘要
为研究不同轴压比与剪跨比下装配式墩柱-盖梁节点的抗震性能,基于某实桥三柱式排架墩,设计并制作了3个不同轴压比试件及1个小剪跨比试件,对比分析了试件的滞回特性、刚度退化、耗能能力、位移延性等抗震性能指标。研究结果表明:不同轴压比下,各试件呈现相似的损伤发展和破坏模式,均表现出良好的承载力和变形能力。轴力变化会影响节点开裂范围,但不会改变节点破坏模式。高轴压比情况下,墩柱裂缝向盖梁发展的趋势得到有效控制。小剪跨比试件呈现出显著的剪切破坏特性,其节点承载力与剪跨比近似成反比,呈现出更高的等效刚度、屈服承载力和峰值承载力,但其耗能能力及耗能效率显著降低,强震作用下的延性较差。
To investigate the seismic performance of prefabricated pier column-cap beam joints under different axial compression ratios and shear span ratios,three specimens with varying axial compression ratios and a small shear span ratio were designed and fabricated based on a real bridge’s three-column bent cap.The seismic performance indicators,including hysteretic behavior,stiffness degradation,energy dissipation capacity,and displacement ductility,were analyzed and compared under low-cycle reversed loading.The results indicate that specimens under different axial compression ratios exhibited similar damage progression and failure modes,demonstrating good load-bearing and deformation capacities.Variations in axial force influenced the extent of joint cracking but did not alter the failure mode.Under high axial compression ratios,the propagation of pier column cracks toward the cover beam was effectively controlled.Specimens with a small shear span ratio displayed pronounced shear failure characteristics,with joint bearing capacity approximately inversely proportional to the shear span ratio.These specimens exhibited higher equivalent stiffness,yield strength,and peak load capacity,but their energy dissipation capacity and efficiency were significantly reduced,along with poorer ductility under strong seismic conditions.
作者
杜程
杨靖宁
邹俊志
常正强
徐腾飞
王传琦
DU Cheng;YANG Jingning;ZOU Junzhi;CHANG Zhengqiang;XU Tengfei;WANG Chuanqi(Shandong Provincal Communications Planning and Design Institute Group Co.,Ltd.,Jinan,Shandong 250101,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Southwest Municipal Engineering Design&Research Institute of China,Chengdu,Sichuan 610081,China)
出处
《施工技术(中英文)》
2025年第22期121-126,共6页
Construction Technology
基金
国家自然科学基金(52311540016)
四川省科技计划(2023ZDZX0010)
中建股份科技研发计划资助(CSCEC-2024-Z-36)。
关键词
桥梁
拟静力试验
抗震性能
轴压比
bridge
quasi-static test
seismic performance
axial compression ratio
