四边形截面圆弧空间钢管桁架拱平面内稳定性及试验研究.pdfVIP

31 8 2010 8 Journal ofBuilding Structures Vol131 No18 Aug12010 008 : 1000-6869( 2010) 08-005 -09 郭彦林, 郭宇飞, 窦 超, 林 冰 (清华大学土木工程系, 北京 10008 ) : , , , ; , , , , , , , , : ; ; ; ; ; : TU3931302 TU31711 : A Theoretical and expermi ental investigation on in-plane stability of spatial circular tube truss-archesw ith quadrangular section GUO Yanlin, GUO Yufe,i DOU Chao, LIN Bing (Departm ent of Civil Engineering, TsinghuaUn iversity, Beijing 10008 , China) A bstract: The buckling m odes and failure m echanism of circular truss-arches w ith quadrangular sections under different load cases includ ing horizontal uniform load, axially uniform ly distributed load and concentrated load were investigated, and the influence of different geom etric param eters of the truss-arches such as sectional height-to-w idth ratio, rise-to-span ratio, web-m ember included angle and sectional dmi ension on the failure mode and bearing capacities were also discussed, wh ich shows that local buckling of chord m embers, local buckling ofw eb m embers, global buck ling and interactive bucklingmay occur under different conditions, and com pared w ith global buckling and chord-m ember local buckling, the buckling ofwebm embers largely decreases bearing capacity of thewhole truss-arch, which should be prevented in design. The tests of four truss-arch modelsw ith rectangular and trapezoidal sections were carried out, which ind icates truss arches w ith the two types of sectionsm entioned above have almost the sam e stiffness and bearing capacity, and they can share the sam e design formula. Finally, the design formula for predicting the bearing capacity of circular