Integration of Wind Tunnel Results on a Space Grid Roof for Predicting it is Modal Response

摘要

This paper presents the modal response characteristics of a space grid roof with diagonal support columns, based on wind tunnel investigations on a 1:20 scale model of space grid roof. The wind tunnel tests were conducted under open terrain conditions using short test section wind tunnel. The Atmospheric Boundary Layer (ABL) velocity profile was generated using barriers and roughing elements. Assuming linear variation of pressure profile from edge-to-edge, the maximum and minimum pressure .co-efficient were derived and compared with corresponding values given in IS: 875-Part-3 on Wind loads. The vibrational response characteristics of space grid roof under wind tunnel test loads were done using Finite Element Analysis Techniques for four modes (two bending modes, two torsional modes). The vibrational response of the wind tunnel model is evaluated and presented in this paper.