Why was the tatara bridge built

Analysis indicated cable-stayed bridge superior to suspension one Originally, back in when the project was first conceived, the bridge was designed as a suspension bridge due to its long center span. However, according to Shuichi Suzuki, an engineer with the Honshu-Shikoku Bridge Authority, this plan would have entailed a large excavation of a steep hill to set the anchorage on one of the connecting islands—Ikuchijima Island—which was located in a national park.

Since technological advances, both in long-span bridge technology and computer-based structural analysis, had occurred since the original plans were made, a cable-stayed bridge was considered in and decided upon Several factors were considered before this decision was made. Characteristics of cable-stayed bridges compared with suspension bridges with center spans ranging from m to 2, m were carefully studied.

The three main factors considered included the aerodynamic design, the eventual cost and the ultimate impact upon the natural environment. In all three instances, the cable-stayed bridge was superior. Additional considerations that needed to be taken into account included the area's propensity for high winds three typhoons struck during the actual construction of the bridge and large scale earthquakes.

The geological conditions primarily granite were also a factor making a bridge preferable to a tunnel. A cable-stayed bridge suffers larger displacement for center spans exceeding 1, m indicating the horizontal displacement factor was not prohibitive as long as the center span remained shorter than 1, m.

It was noted that a cable-stayed bridge has a higher torsional frequency than a suspension bridge and, therefore, generally offers better aerodynamic stability than a suspension bridge with the same span length. Thus, it was concluded that a cable-stayed bridge was the better option as long as the center span remained shorter than 1, m. Extensive testing and analysis characterized project throughout One of the highlights of the project was the extensive testing and analysis that accompanied the progress of the bridge.

Wind tunnel tests were conducted at a large wind tunnel laboratory managed by the bridge authority. It was noted that attempts were made to make the scale model as large as possible. The unique topography of the area also prompted a full-model test including models of the mountainous topography surrounding the bridge. Wind tunnel tests conducted during construction as well as completion Since safety of the project during construction as well as at completion was important, wind tunnel tests were conducted in both instances.

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View 2 excerpts, cites background. The importance of bridge aerodynamic investigations was immediately realized after the Tacoma Narrows Bridge collapsed in Since then the aerodynamic control system that using moveable flaps to … Expand. View 2 excerpts, cites methods. The model tuning through sensitivity analysis is a prominent procedure to assess the structural behavior and dynamic characteristics of cable-stayed bridges. Most of the previous sensitivity-based … Expand. View 1 excerpt. Design of Tatara Bridge.