17:15 〜 19:15
[HCG24-P08] Long-Term Impact of Climate Change on the Structural Dynamics of the Rio Grande Bridge, Costa Rica
キーワード：Climate, Frequency, Structures, Temperature, Costa Rica, Bridges
This study assesses how climate change affects the dynamic behavior of the Rio Grande Bridge in Costa Rica by examining the influence of temperature variations on its vibration frequencies. While structural dynamics changes are often linked to damage or degradation, this study isolates the thermal effects on the bridge’s response. Dynamic response measurements were conducted at three locations on the bridge at different times of the day, ranging from 04:00 to 14:00, with recorded temperatures between 22.05°C and 33.6°C. The results indicate that temperature fluctuations cause frequency variations of up to 0.4% in the vertical axis and up to 2.74% in the transverse axis.
To assess future temperature impacts, climate projections from Alvarado Gamboa (2021) were incorporated, specifically those under the RCP 8.5 scenario. By 2100, an additional 4.5°C increase is projected, leading to a total temperature fluctuation of 16.05°C. Assuming a linear relationship between temperature change and frequency variation, the projected frequency changes reach 0.56% in the vertical axis and 3.81% in the transverse axis.
These findings emphasize the need to account for thermal effects in structural health monitoring and damage detection. In practice, temperature-induced variations could mask or amplify signs of structural damage, affecting the accuracy of damage assessments. Future studies should refine predictive models to distinguish between normal thermal fluctuations and damage-related changes, improving maintenance and monitoring strategies for bridges and other infrastructure.
Considering temperature-induced frequency variations in post-event damage assessments—such as after earthquakes, impacts, and hurricanes—will enhance infrastructure resilience and longevity amid changing climatic conditions.
To assess future temperature impacts, climate projections from Alvarado Gamboa (2021) were incorporated, specifically those under the RCP 8.5 scenario. By 2100, an additional 4.5°C increase is projected, leading to a total temperature fluctuation of 16.05°C. Assuming a linear relationship between temperature change and frequency variation, the projected frequency changes reach 0.56% in the vertical axis and 3.81% in the transverse axis.
These findings emphasize the need to account for thermal effects in structural health monitoring and damage detection. In practice, temperature-induced variations could mask or amplify signs of structural damage, affecting the accuracy of damage assessments. Future studies should refine predictive models to distinguish between normal thermal fluctuations and damage-related changes, improving maintenance and monitoring strategies for bridges and other infrastructure.
Considering temperature-induced frequency variations in post-event damage assessments—such as after earthquakes, impacts, and hurricanes—will enhance infrastructure resilience and longevity amid changing climatic conditions.