Experimental study of critical and post-buckling behaviour of prestressed stayed columns

A full scale experimental study of prestressed stayed columns

“…on buckling load [10] 1982 Plane single cross-arm 3.05 E, A, N Effect of initial imperfections on buckling load were investigated. Relationships between load and lateral deformations were proposed in addition to experimental studies on stayed column [11] 1984 Plane single cross-arm 0.81 E, N A series of tests were performed and compared with FE procedure which was developed in this study [12] 1985 --A Analytical studies to distinguish between buckling modes were performed [13] [18][19][20] 2010 Single cross-arm 3.05 N The issue of the true optimal prestress for stayed columns was examined through proposed structural optimisation indicators involving both instability and material quantity measures using FE simulations [21] 2012 Plane single cross-arm 2.8 E, N 18 full scale tests were performed Above experiments were used for validating FE simulation [22] 2013 Plane single cross-arm 2.9 N, A Numerical sensitivity study was performed to find out effect of cross-arm length on the load The sensitivity of the load carrying capacity to the geometry of the stayed column, the initially applied prestress level within the stays and the initial global imperfection was investigated numerically General design procedure for prestressed stayed columns with a single cross-arm system was proposed. (see Section 5) [23,24] * E: Experimental, A: Analytical and N: Numerical, Unit is in m. displacements at both ends and all other transducers were used to measure lateral displacements at every 1500 mm segments.…”

Stability of prestressed stayed steel columns with a three branch crossarm system

“…This implies that the critical buckling load is less than 8% of the yield load. Moreover, in actual experimental studies of stayed columns, even though the buckling load of the column system is considerably enhanced due to the prestressed stay system, it has been demonstrated quite conclusively for practical arrangements [16,14,17,4] that elastic behaviour is (almost) exclusively observed. Even if material yielding is detected, it is only observed at deformation levels that are well beyond those at the ultimate load.…”

“…Saito and Wadee were the first to investigate the perfect post-buckling [11], imperfection sensitivity [12] and interactive buckling behaviour [13] of the stayed column systematically. Further research included experimental studies [14] that led to the formulation of design equations and recommendations [15]. Prestressed stayed columns are by their very nature constructed from highly slender elements.…”

Compressive behaviour and design of prestressed steel elements

“…Early work by Magnel [1] in 1950 experimentally demonstrated the improved economy that can be achieved by prestressing truss girders. More recent studies have explored the behaviour and design of prestressed steel beams [2,3], columns [4,5,6,7,8,9], trusses [10,11] and space trusses [12,13]. The behaviour of prestressed frames with sliding joints has also been examined both during the stress-erection process [14] and under external loading [15,16,17,18].…”