Search Results (2)

This study investigated the vortex-induced vibration (VIV) characteristics of a proposed water-conveying truss pipeline cable-stayed bridge through wind tunnel tests. The experimental results indicated that both vertical bending and torsional VIV responses decreased as the wind attack angle increased. The vertical bending VIV behavior of the bridge was significantly influenced by the lateral spacing and relative height of the pipelines. Adjustments to these geometric parameters markedly affected the structural VIV response. Furthermore, computational fluid dynamics (CFD) was employed to analyze the flow field around the truss pipeline bridge. The results revealed that changes in the lateral spacing and relative height of the pipelines primarily altered the VIV performance by modifying vorticity distribution, separation point position, and other critical flow field parameters around the truss section. These findings underscore the importance of considering the effects of geometric parameters on VIV during the design of the truss section in pipeline bridges. Full article

Pipeline bridges are structures characterized by their triangular truss designs, which provide support and stability for pipelines. They have been used for centuries to span gaps and are still widely employed today in various forms and applications. This paper aims to explore the technical and economic aspects associated with optimizing the performance of a pipeline bridge by modifying the constitutive elements. It was investigated how variations in geometric elements and other design characteristics can influence the stress state and the associated material costs, so as to find solutions and strategies that allow the obtaining of a more efficient, safer, and more economical structure, without compromising quality or safety. Different construction scenarios were analyzed, revealing a stress increase of up to 54.77% in comparison to the lowest stress scenario (Scenario 6). Lower stress values were achieved using thicker pipes, with minimal influence from angle dimensions. A statistical analysis using ANOVA, performed in Minitab, showed that both maximum stress and material costs are predominantly influenced by pipe type (99.7% and 81.72%, respectively), rather than angle size. The optimal solution for minimizing stress and costs was determined to be the combination of angle C1 (30 × 30 × 3 mm) and pipe T3 (60.3 × 3.6 mm). This work contributes to the state of practices by providing detailed guidelines on selecting structural configurations that balance cost and performance, making it highly relevant for the design and optimization of pipeline bridges. Full article