Optimal prestressing of triple-bay prestressed stayed columns

Abstract A nonlinear finite element model of a triple-bay prestressed stayed column is developed within the commercial package ABAQUS. A linearly obtained ‘optimal prestressing force’ that maximizes the critical buckling load is investigated since this quantity has been demonstrated in previous work on single-bay prestressed columns to provide a lower bound to the actual maximum load carrying capacity when compared to experimental results and nonlinear modelling. The ratio of the crossarm to the overall column length, the diameter of the cable stays, the relative lengths of the individual crossarms and the ratio of the initial prestressing force to the aforementioned linear optimal prestress are varied. Measures for the relative efficiency of the main column and the stays are defined and the objective of the optimization study is for the efficiency to be maximized. It is found that the true optimal prestress is generally higher than the equivalent, linearly obtained, quantity but by a significantly reduced factor when compared to an equivalent study for single-bay prestressed stayed columns.

[1]  P ? ? ? ? ? ? ? % ? ? ? ? , 1991 .

[2]  Luís Simões da Silva,et al.  A full scale experimental study of prestressed stayed columns , 2015 .

[3]  M. Ahmer Wadee,et al.  Stability of prestressed stayed steel columns with a three branch crossarm system , 2016 .

[4]  Murray C. Temple,et al.  Pretensioning of single-crossarm stayed columns. , 1979 .

[5]  Murray C. Temple,et al.  Stayed Column with Initial Imperfection , 1982 .

[6]  A. H. Chilver.  Coupled modes of elastic buckling , 1967 .

[7]  Daisuke Saito,et al.  Numerical studies of interactive buckling in prestressed steel stayed columns , 2009 .

[8]  M. Ahmer Wadee,et al.  Design of prestressed stayed columns , 2013 .

[9]  M. C. Temple,et al.  Buckling of Stayed Columns , 1977 .

[10]  John S. Ellis,et al.  Buckling of a Single-Crossarm Stayed Column, , 1975 .

[11]  João Martins,et al.  Structural behaviour of prestressed stayed columns with single and double cross-arms using normal and high strength steel , 2016 .

[12]  Erling A. Smith,et al.  Behavior of Columns with Pretensioned Stays , 1985 .

[13]  Leroy Gardner,et al.  Numerical Studies on the Buckling Resistance of Prestressed Stayed Columns , 2013 .

[14]  Luís Simões da Silva,et al.  Design of Steel Structures: Eurocode 3: Design of Steel Structures, Part 1-1: General Rules and Rules for Buildings , 2010 .

[15]  M. Ahmer Wadee,et al.  Effects of periodic and localized imperfections on struts on nonlinear foundations and compression sandwich panels , 2000 .

[16]  Mark A. Bradford,et al.  The Behaviour and Design of Steel Structures to EC3 , 2008 .

[17]  Kuang-Han Chu,et al.  Analysis and Design of Struts with Tension Ties , 1963 .

[18]  Leroy Gardner,et al.  Experimental study of critical and post-buckling behaviour of prestressed stayed columns , 2012 .

[19]  Jialiang Yu.  Nonlinear stability of prestressed stayed columns with multiple crossarm systems , 2016 .

[20]  Daisuke Saito,et al.  Post-buckling behaviour of prestressed steel stayed columns , 2008 .

[21]  L. P. Felton,et al.  Optimum design of columns supported by tension ties. , 1967 .

[22]  Jialiang Yu,et al.  Mode interaction in triple-bay prestressed stayed columns , 2017 .

[23]  D. Saito,et al.  Optimal prestressing and configuration of stayed columns , 2010 .

[24]  Maryam Farsi,et al.  Imperfection sensitivity and geometric effects in stiffened plates susceptible to cellular buckling , 2015 .

[25]  M. Ahmer Wadee,et al.  Asymmetric Secondary Buckling in Monosymmetric Sandwich Struts , 2005 .

[26]  I. V. Savin,et al.  Prestressed load-bearing metal structures , 1977 .

[27]  Leroy Gardner,et al.  Buckling mode interaction in prestressed stayed columns , 2013 .

[28]  Murray C. Temple,et al.  Failure Criteria for Stayed Columns , 1984 .

[29]  Christina Völlmecke,et al.  Nonlinear buckling of fibre-reinforced unit cells of lattice materials , 2016 .

[30]  Uwist,et al.  A PARAMETRIC STUDY OF THE INITIAL BUCKLING OF STAYED COLUMNS. , 1980 .

[31]  Daisuke Saito,et al.  Buckling behaviour of prestressed steel stayed columns with imperfections and stress limitation , 2009 .