平面桁架拱平面外弹性稳定及设计方法研究

Out-of-plane elastic stability and design method of planar truss arch

平面桁架拱是桁架拱的一种特殊形式,其平面内具有桁架结构的特点,而平面外则与实腹式拱相近。在实腹式拱稳定研究的基础上,对平面桁架拱的平面外稳定性能进行了研究。首先得到了平面桁架拱的弹性屈曲公式,其次采用有限元算例研究了压弯平面桁架拱的受力机理,并提出的压弯桁架拱弹性设计方法。研究成果将作为平面桁架拱的平面外稳定设计的理论基础。

Planar truss arch is a special form of tubular truss arch which has been widely used in structure engineering. It has the same in plane mechanical characteristic as truss structures,while its out of plane characteristic is similar to solidweb arch. Based on the stability study of solid-web arch,the out of plane stability of plane truss arch was discussed.Firstly,the elastic buckling load was achieved,and then the mechanism of plane truss arch under compression-bending load was studied based on FEM examples,and the compression-bending related equation was proposed. The results may be used as the theoretical base of the out-of-plane inelastic design of planar truss arches