Design of Industrial R/C Chimneys

Design Codes for R/C industrial chimneys such as CICIND [5.4–1] or DIN 1056 [5.4–2] are based on linear dynamic analysis with uncracked cross-sections. Under extreme loading conditions, however, nonlinear effects may become important, particularly when approaching the ultimate limit state. This fact, of course, directly affects the dynamic amplification of the response, which in general is expressed by the so called gust response factor (GRF). Naturally, the quantification of this factor depends on the respective structural model which is utilized. In addition, it is also affected by taking into account the tensile strength of concrete. In other words, the utilization of most realistic structural models is of great importance particularly when approaching the ultimate limit state.