ESDU 96031 B-1999 COMPUTER PROGRAMS FOR RESPONSE OF STRUCTURES TO VORTEX SHEDDING. Structures of Circular or Polygonal Cross Section Part 1. Microsoft Excel module
INTRODUCTION ESDU 960306 describes the nature of the lateral response to vortex shedding of structures of circular cross section. It then develops a method for calculation of this response together with the data required for its implementation. This method takes account also of the lateral response to buffeting by across-wind atmospheric turbulence components@ using the methods of ESDU 890495. Comparisons of predictions with both model and full-scale measurements and a discussion of methods of reducing the response to vortex shedding are also included in ESDU 96030. The calculation method is complex and it can realistically be implemented only through a computer program. The Program is available in three formats: (i) as FORTRAN 77 source code. (ii) as compiled executable code (for use with the ESDUview interface). (iii) as a Module to run within the Microsoft Excel* spreadsheet program. All three versions are supplied? on Disk Volume 3c in the Wind Engineering Software Volume. This Item gives guidance on running the Excel Module; use of the Fortran program and ESDUview interface is covered in Reference 9. The method can be applied for the following structure types and flow conditions: ? parallel-sided@ tapered and stepped structures@ ?circular or regular polygon cross section (8 or more sides)@ ? smooth or rough surfaces (for structures with ancillaries such as ladders attached the method applies only if the ancillary is entirely in the main structure wake)@ ? cantilevered structures and structures between end fixings@ ? vertical@ horizontal or inclined structures@ ? structures with or without strakes@ ? uniform or shear flow@ ? smooth or turbulent flow@ ? normal or yawed flow (a yawed wind affects the response only if the structure is not vertical)@ ? natural wind (full scale)@ ? simulated wind (wind tunnel)@ ? internal flows in which the structure causes a blockage of less than 10%. Example applications include stacks (chimneys) and process plant towers@ lighting standards and elements of lattice structures. Several worked examples are described in Section 3 and some guidance on sources of input data is given in Appendix A. * Microsoft and Excel are trademarks of the Microsoft Corporation ? The Fortran and ESDUview versions will be issued later.
ESDU 96031 B-1999 history
1999ESDU 96031 B-1999 COMPUTER PROGRAMS FOR RESPONSE OF STRUCTURES TO VORTEX SHEDDING. Structures of Circular or Polygonal Cross Section Part 1. Microsoft Excel module