PT Journal
AU Chowdhury, S
   Zabel, V
TI Influence of loading sequence on wind induced fatigue assessment of bolts in TV-tower connection block
SO Results in engineering
PD August
PY 2022
BP 1
EP 18
VL 16, 2022
PU Elsevier
DI 10.1016/j.rineng.2022.100603
WP https://www.db-thueringen.de/receive/dbt_mods_00061809
LA en
DE Schadensakkumulation; Lebenszyklus; Windlast; Damage accumulation; Fatigue life; Loading sequence; Rainflow counting algorithm; Wind load; OA-Publikationsfonds2022
SN 2590-1230
AB Bolted connections are widely employed in structures like transmission poles, wind turbines, and television (TV) towers. The behaviour of bolted connections is often complex and plays a significant role in the overall dynamic characteristics of the structure. The goal of this work is to conduct a fatigue lifecycle assessment of such a bolted connection block of a 193 m tall TV tower, for which 205 days of real measurement data have been obtained from the installed monitoring devices. Based on the recorded data, the best-fit stochastic wind distribution for 50 years, the decisive wind action, and the locations to carry out the fatigue analysis have been decided. A 3D beam model of the entire tower is developed to extract the nodal forces corresponding to the connection block location under various mean wind speeds, which is later coupled with a detailed complex finite element model of the connection block, with over three million degrees of freedom, for acquiring stress histories on some pre-selected bolts. The random stress histories are analysed using the rainflow counting algorithm (RCA) and the damage is estimated using Palmgren-Miner's damage accumulation law. A modification is proposed to integrate the loading sequence effect into the RCA, which otherwise is ignored, and the differences between the two RCAs are investigated in terms of the accumulated damage.
PI Amsterdam
ER