摘要
压杆的承载力大都由稳定性控制而不是强度控制,提高受压杆件的稳定承载力是受压杆件加固的主要目标。钢套管加固受压杆是一种受力明确、施工方便的加固方式,已经被广泛采用,刚性预应力撑杆加固受压杆也是一种减小受压杆应力的加固方法。考虑钢套管与被加固压杆之间通过侧向限位措施保持侧向变形协调一致,利用失稳时压缩应变能释放等于弯曲应变能吸收的条件,得到了钢套管加固后受压杆稳定性承载力的临界值,该计算式同样适用于刚性预应力撑杆加固受压杆的设计计算。利用ANSYS对一算例进行了大变形几何非线性失稳计算,得到了4种不同加载情况下的稳定性荷载临界值,与理论分析值相差不足1%,验证了理论值的正确性,也验证了在外套管与受压杆通过数个节点限位可以满足变形一致的要求。
The bearing capacity of compression bars is mostly controlled by stability rather than strength.It is the main goal to improve the stable bearing capacity of the compression members when they are reinforced.Outer sleeve reinforcement is a kind of method with definite load condition and convenient construction,and has been widely used.Rigid prestressed strut reinforcement is also a method to reduce the compressive stress of compression bar.In the paper,the lateral deformation between the steel sleeve and the reinforced compression bar was kept in harmony.The critical value of the stability bearing capacity of the compression bar was obtained by using the condition that the release of compressive strain energy was equal to the absorption of bending strain energy in the case of instability.The formula was also suitable for the design and calculation of the reinforcement with rigid prestressed strut.An example of large deformation geometric nonlinear instability was calculated by ANSYS and the critical values of stability load under four different loading conditions were obtained.The difference from the theoretical analysis value was less than 1%,which verified the correctness of the theoretical value in the paper,and also verified that the outer sleeve and compression bar could meet the requirements of consistent deformation through several node limits.
作者
曾滨
尚仁杰
崔璀
许庆
徐曼
ZENG Bin;SHANG Renjie;CUI Cui;XU Qing;XU Man(Central Research Institute of Building and Construction Co.,Ltd.,MCC Group,Beijing 100088,China;China Shipbuilding NDRI Engineering Co.,Ltd.,Shanghai 200063,China)
出处
《工业建筑》
CSCD
北大核心
2021年第6期133-137,共5页
Industrial Construction
基金
十三五重点研发计划资助课题(2018YFF0300206)
中冶建筑研究总院重大课题资助项目(JAG2018Ky01)。
关键词
压杆稳定
套管加固
刚性预应力撑杆
大变形
屈曲
stability of compression bar
outer sleeve reinforcement
rigid prestressed strut
large deformation
buckling
