摘要
大跨连体桁架由于具有跨度大、安装高度高等特点,常采用整体提升的施工方法。相较于一次成型状态,提升施工工艺会使结构产生附加内力。本研究从能量转换的角度研究了提升过程中的附加内力形成机制。在提升过程中,提升反力作为外部约束作用于提升吊点,结构自身重力通过做功将能量传递至被提升机构。这一过程导致结构内部积累了附加变形能,进而产生附加内力。以某项目大跨连体桁架整体提升为案例,对比各附加内力控制方案,研究如何优化结构附加内力。结果表明,增大提升吊点处竖向自由度刚度,能有效降低结构附加内力。
Due to the characteristics of the large span and high installation height,the construction method of integral lifting is often used for large-span connected truss structures.Compared to the onestep forming state,the construction method of integral lifting will generate additional internal forces in the structure.This article studies the mechanism of additional internal force generation during the lifting process from the perspective of energy transmission.During the lifting,the support reaction acts as an external constraints on the lifting point,the gravitational potential energy transmitting energy to the lifting and lifted structure through work.This process leads to the accumulation of deformation energy inside the structure,which generates additional internal forces.Taking the integral lifting of a large-span connected truss engineering as a case study,this study compares various additional internal forces control schemes and studies how to optimize the additional internal forces of the structure.The results indicate that increasing the vertical stiffness of the lifting point can effectively reduce the additional internal forces of the structure.
作者
姚杰
李成龙
刘新泽
吕建军
张明洋
YAO Jie;LI Cheng-long;LIU Xin-ze;LYU Jian-jun;ZHANG Ming-yang(Zhejiang Jinggong Steel Building Group Co.,Ltd.,312030,Shaoxing,Zhejiang,China;BCEG No.3 Construction Engineering Co.,Ltd.,100044,Beijing,China)
出处
《建筑技术》
2024年第21期2569-2571,共3页
Architecture Technology
关键词
大跨连体桁架
整体提升
能量转换
附加内力
变形能
large-span connected truss structures
integral lifting
energy transmission
additional internal forces
deformation energy
