Mechanical Behaviors Study On The Main Cable Of Model Test In Super Long-span Self-anchored Suspension Bridge

Basing on the test model of Taohuayu Yellow River Bridge, the effects of main cable's linear characters and bending stiffness in this model are explored relying on the key scientific project of transportation industry (2010-353-341-230) leaded by my tutor. The main work and conclusions are summarized as the followings:(1) Analysis and comparisons of the cable curve and shear forces using piecewise-concentrated counterweight and uniform counterweight are respectively made basing on the principle of similarity theory and numerical analysis methods, and the results prove the reasonability to use piecewise-concentrated counterweight instead of uniform counterweight. According to the ideology of unstressed control theory, a method of taking theoretic lifting point as reference point to determine the clamp position is advanced, which reduces the measuring work in construction, improves the work efficiency and is less susceptible to the change of construction environment.(2) The influences of main tower's error (height error and span error) and temperature change on the free cable curve are explored, and respective relationships between the error factors and the cable curve are analyzed and derived basing on traditional parabolic theory. The sensitivity of the free cable curve to each error factor is correspondingly studied through FEM including in error factors. And then adjusting measures aiming at test model are further proposed according to the relationship obtained.(3) Aiming at the effects of bending stiffness of main cable on the cable curve, main cable is simulated by beam element but not traditional cable element, and the bending stiffness method for beam element is obtained by the analysis of the linear differences using two different element type. The bending stress variation with the system transition in where the cable clamp locates is analyzed according to theoretical calculation.