CAJ | 학술논문

考虑索和吊桥的非保向力效应,利用能量法对下承式平行双肋斜张拱桥的横向稳定问题进行分析,得到了斜张拱桥横向屈曲临界荷载的实用计算表达式.研究表明,索结构的索面大小、水平倾角、索张力大小及拱上锚固位置和拱结构的矢跨比、横撑在拱切向面内抗弯刚度、横撑数量等因素对结构横向稳定性能影响很大,而横撑在拱径向面内抗弯刚度和拱肋抗扭刚度、竖向抗弯刚度等因素的影响很小;考虑非保向力效应后,拉索使结构横向稳定性能有显著提高.
고필색화조교적비보향력효응,이용능량법대하승식평행쌍륵사장공교적횡향은정문제진행분석,득도료사장공교횡향굴곡림계하재적실용계산표체식.연구표명,색결구적색면대소、수평경각、색장력대소급공상묘고위치화공결구적시과비、횡탱재공절향면내항만강도、횡탱수량등인소대결구횡향은정성능영향흔대,이횡탱재공경향면내항만강도화공륵항뉴강도、수향항만강도등인소적영향흔소;고필비보향력효응후,랍색사결구횡향은정성능유현저제고.
Considering the effect of non-directional load of cables and suspenders,the principle of the minimum potential energy is used to analyse the instability behavior in lateral of cable-stayed arch bridge,and a practical formula to determine the critical load of lateral stability of cable-arch structure is given.The result shows that the size of cable-plane,level inclination,the size of cable tension,and the anchor position on arch of the cable structure and rise-to-span ratio,the bending stiffness of crossbar in arch tangential plane and the quantity of crossbar of arch structure have obvious effect on the lateral stability,but the effect of the bending stiffness of crossbar in arch radial plane,the torsional stiffness and vertical bending stiffness of arch rib is small.Considering the effect of non-directional load,cable can improve the lateral stability significantly.