采用FRP、钢管、混凝土的组合柱轴压承载力统一计算公式  

Unified calculation formula on axial compressive capacity of composite columns composed of FRP,steel and concrete

作　　者：高新禹 古金本 袁顺利 陶毅[2,3] GAO Xinyu;GU Jinben;YUAN Shunli;TAO Yi(China Railway 20th Bureau Group Co.,Ltd.,Xi’an 710032,China;College of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;State Key Lab of Green Building,Xi’an 710055,China;China Railway Construction and Safety Engineering Design Institute Co.,Ltd,Shijiazhuang 050043,China)

机构地区：[1]中铁二十局集团有限公司,西安710032 [2]西安建筑科技大学土木工程学院,西安710055 [3]绿色建筑全国重点实验室,西安710055 [4]中铁建安工程设计院有限公司,石家庄050043

出　　处：《建筑结构》2024年第18期152-158,135,共8页Building Structure

基　　金：国家自然科学基金项目(51978567)。

摘　　要：随着FRP与传统材料的组合应用,国内外学者提出了适用不同工程背景的FRP、钢管、混凝土新型组合柱形式。考虑到其约束效果可以采用统一的侧向约束系数来评价,针对大多数基于FRP、钢管、混凝土的组合柱提出较为简便的统一计算公式。为建立适用范围广的组合柱轴压承载力统一计算公式,回顾了已有的FRP、钢管、混凝土组合柱形式,并按其约束形式分为四类截面。根据双剪统一强度理论,引入钢管屈服强度折减系数、方钢管的不均匀约束系数来考虑极限状态时钢管轴向应力低于其屈服强度的特点,分别推导出四类截面的组合柱轴压承载力计算公式。该公式考虑了组合柱的套箍指标、钢管屈服强度折减系数和组合柱截面尺寸影响,形式简单,适用范围广。通过与试验数据对比,提出的统一计算公式的理论计算值与试验值较为吻合。With the combined application of FRP and traditional materials,scholars at home and abroad have proposed new composite column forms of FRP,steel pipe and concrete suitable for different engineering backgrounds.Considering that the constraint effect can be evaluated by a unified lateral constraint coefficient,a simple unified calculation formula was proposed for most composite columns based on FRP,steel pipe and concrete.In order to establish a unified calculation formula for the axial compression capacity of composite columns with a wide range of application,the existing composite columns of FRP,steel tube and concrete are reviewed and divided into four sections according to their constraint forms.According to the double shear unified strength theory,the reduction coefficient of steel pipe yield strength and the non⁃uniform constraint coefficient of square steel pipe are introduced to consider the characteristics that the axial stress of steel pipe is lower than its yield strength in the limit state,and the calculation formulas for the axial compression capacity of composite columns of four sections were derived respectively.The formula takes into account the collar index of the composite column,the reduction coefficient of the yield strength of the steel pipe and the influence of the section size of the composite column,and has a simple form and wide application range.By comparing with the experimental data,the theoretical calculated values of the unified calculation formula presented are in good agreement with the experimental values.

关 键 词：纤维增强复合材料 组合柱 双剪统一强度理论 轴压极限承载力 统一计算公式 

分 类 号：TU318.1[建筑科学—结构工程]