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。 Plane truss arch is a special form of truss arch, truss structure has the characteristics of the plane, while the plane is similar to the solid abdominal arch. Based on the research on the stability of the solid abdominal arch, the out-of-plane stability of the plane truss arch is studied. First, the elastic buckling formula of the plane truss arch is obtained. Then the finite element method is used to study the force mechanism of the buckling plane truss arch and the elastic design method of the buckling truss arch is proposed. The research results will serve as the theoretical basis for the out-of-plane stability design of planar truss arch.