节段预制拼装桥墩接缝承载能力的影响因素分析  

INFLUENCING FACTOR ANALYSIS ON THE BEARING CAPACITY OF JOINTS IN PRECAST CONCRETE SEGMENTAL BRIDGE COLUMNS

作　　者：胡皓 HU Hao(Shanghai Urban Construction Design&Research Institute(Group)Co.,Ltd.,Shanghai 200125,China)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《工业建筑》2020年第3期88-95,共8页Industrial Construction

摘　　要：为了分析节段式桥墩接缝承载能力的影响因素,建立了节段式桥墩受力性能的数值分析方法,对可能影响接缝承载能力的轴压力、配箍率、预应力筋初始张拉应力及砂浆层强度等因素进行了全面的参数分析。研究结果表明:采用数值分析方法可以较为满意地反映出节段式桥墩在压弯剪耦合作用下不同阶段的受力特点;当设计轴压比由13%增大到33%时,普通钢筋配筋桥墩接缝承载力提高40. 3%,钢绞线配筋桥墩接缝承载力提高17. 8%;增大预应力筋有效应力可以较小程度地增大接缝承载力;当砂浆层强度等级由C80降低到C40时,接缝承载力降低19. 7%。To analyze the influencing factors of bearing capacity of joints in segmental columns,the numerical analysis method of mechanical properties of segmental columns was proposed. Comprehensive parametric analysis was then conducted to obtain the influence of the factors such as axial compression force,stirrup ratio,initial tension stress of prestressing tendons,and strength of mortar layer. The results indicated that: the stress features of the segmental columns in different stages could be satisfactorily reflected by the numerical analysis method under axialflexure-shear coupling behavior;when the design axial compression ratio increased from 13% to 33%,the ultimate bearing capacity of the joints in coventionally reinforced concrete segmental columns increased by 40. 3%,and the ultimate bearing capacity of the joints in prestressed concrete segmental columns increased by 17. 8%;increasing the initial prestressing stress of prestressing tendons could improve the bearing capacity of joints to a lesser degree;when the strength grade of the mortar layer decreased from C80 to C40,the ultimate bearing capacity of the joints decreased by 19. 7%.

关 键 词：接缝承载能力 数值分析 节段预制拼装桥墩 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]