Cable-stayed columns and their applications in building structures

Krishnan, Sudarshan

doi:10.1016/j.jobe.2019.100984

Cited by 14 publications

(12 citation statements)

References 15 publications

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“…Existing so-called 'super struts' are currently used; constructed from heavy tubular steel cross-sections, these struts need to withstand earth pressures axially in conjunction with their considerable self-weight under bending. An iconic structure that has already employed a system of stayed columns and beam-columns is 'La Grande Arche' in Paris [31]. The internal structure includes a suspended membrane roof, part of which is supported by a system of prestressed cable-stayed columns that are braced every 21 m by stayed beamcolumns in the horizontal plane, the details of which are shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Prestressed stayed beam-columns: Sensitivity to prestressing levels, pre-cambering and imperfections

Wadee

Gardner

2021

Engineering Structures

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The behaviour and structural performance of imperfect beam-columns with crossarms and externally prestressed cable stays are studied numerically, where the combination of bending and compression is assumed to be derived from the system self-weight acting orthogonally to the applied axial load. Both doubly-symmetric and mono-symmetric systems are studied. Sensitivity of the structural response to varying prestressing levels, pre-cambering and initial imperfections is investigated. Different initial imperfection levels and combinations are considered to facilitate the exploration of interactive buckling. The optimum prestressing force in terms of ultimate resistance and two structural efficiency indicators is also studied. It is found that relatively small crossarm lengths, stay diameters and crossarm length ratios should be avoided. Moreover, mono-symmetric cases are more sensitive to the level of pre-cambering than their doubly-symmetric counterparts. Considering both load-carrying capacity and structural efficiency, doubly-symmetric cases perform best with zero pre-cambering, but mono-symmetric cases perform best with upward precambering. As for the true optimum prestressing levels, these are recommended to be significantly above the linearly obtained optimum to maximize the structural efficiency.

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Section: Introductionmentioning

confidence: 99%

Prestressed stayed beam-columns: Sensitivity to prestressing levels, pre-cambering and imperfections

Wadee

Gardner

2021

Engineering Structures

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“…Slender struts supported with prestressed cable-stays in conjunction with periodicallyspaced crossarms distributed longitudinally, offer an attractive, innovative and pragmatic solution for reducing structural self-weight while maintaining buckling strength [1]. The use of the crossarm-stay system with pretensioning within the cable stays effectively provides intermediate supports that act to reduce the effective buckling wavelength which, in turn, results in a higher load-carrying capacity.…”

Section: Introductionmentioning

confidence: 99%

Interactive buckling in prestressed stayed beam-columns

Wadee

Gardner

2020

International Journal of Mechanical Sciences

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The instability of beam-columns with crossarms and externally prestressed cable stays is studied analytically, where the combination of bending and compression is assumed to be derived from the system self-weight acting orthogonally to the applied axial load. A nonlinear analytical model for prestressed stayed beam-columns with doubly-symmetric and mono-symmetric configurations, based on the Rayleigh-Ritz method, is presented that captures modal interactions for perfect geometries explicitly for the first time. It is demonstrated that the theoretical compressive strength enhancements under certain configurations can only be obtained at the expense of triggering a sequence of destabilizing bifurcations. This can give rise to severely unstable interactive post-buckling behaviour including the so-called 'mode jumping' phenomenon. Moreover, for mono-symmetric stayed beam-columns, it is shown that the varying levels of prestress within the stays can lead to different buckling modes which all have their own characteristic post-buckling responses. The analytical model is verified using a nonlinear finite element model formulated within the commercial code ABAQUS and excellent comparisons are obtained.

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“…This is normally achieved through the introduction of additional cross-arms and stays in the perpendicular direction, resulting in two axes of restraint. A study by Krishnan (2020) presents case studies where PSCs have been used in practice. PSCs have been studied since the 1960s (Chu and Berge, 1963), with the first finite element (FE) study being carried out by Temple (1977).…”

Section: Introductionmentioning

confidence: 99%

Behaviour of eccentrically loaded prestressed stayed columns with circular hollow sections

Hyman

Osofero

2020

Advances in Structural Engineering

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The behaviour of axially loaded prestressed stayed columns is a commonly studied area. Despite the fact that load eccentricity in columns is commonplace in practice, the amount of investigation into these systems under eccentric loading is limited. This study employed finite element analysis to investigate the interactive post-buckling behaviour of prestressed stayed columns. Critical imperfection combination with respect to the load carrying capacity was established and a comparison of a planar and a three-dimensional model was carried out to investigate key differences in the models. In this work, it has been shown that the load carrying capacity of eccentrically loaded columns can be significantly reduced when buckling in interactive mode is observed. Furthermore, it was established that increase in eccentricity results in a decrease in load carrying capacity of columns for both planar and three-dimensional models. However, a major difference between the models is the twisting effect exhibited in the three-dimensional model under out-of-plane eccentric loading. This work highlights the importance of carefully designing prestressed stayed columns’ connections to minimise loading eccentricity as it has been shown that the benefit of employing these systems over unstayed columns reduces with increasing load eccentricity.

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Cable-stayed columns and their applications in building structures

Cited by 14 publications

References 15 publications

Prestressed stayed beam-columns: Sensitivity to prestressing levels, pre-cambering and imperfections

Prestressed stayed beam-columns: Sensitivity to prestressing levels, pre-cambering and imperfections

Interactive buckling in prestressed stayed beam-columns

Behaviour of eccentrically loaded prestressed stayed columns with circular hollow sections

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