The Sei Dareh Bridge is a cable-stayed bridge located in West Sumatra Province, Indonesia. The bridge, has a main span of 123 meters length and 9 meters wide, crosses the Batanghari River. Traffic load is transmitted through 4 prestressed cables to a 42.4 meter high pylon made of concrete. Bridge deck and traffic loads are directly supported by steel box girders as main beams that are reinforced laterally with cross beams IWF 800.300.16.24 and stringers IWF 350.350.12.19. This paper discusses static and dynamic testing on the bridge which aims to assess the feasibility before it is opened for public. Based on the test, it was concluded that the 73% static load could not be achieved because the deflection that occurred was beyond the allowable deflection. This is exacerbated by the sound of a loud clanging sound on the ST2-X1 prestressed cable when loading to 240 tons or 58% of the targeted load. In addition, this bridge is included in the "lazy bridge" category because it takes 24 hours to return to an undeformed condition after loading. As a recommendation for this bridge, it is necessary to carry out a structural health monitoring system (SHMS) regularly on the vehicle floor and cables.
Suspension bridge is a type of bridge which have the deck hung below the suspension cables on vertical suspenders. The bridge is commonly used for long spans. One of the longest suspension bridge is Akashi-Kaikyo in Japan. Cost effective, suitable for long span bridge, have more flexibility and less complicated construction are the advantage of suspension bridges. Therefore suspension bridges are not only designed for vehicles but also for pedestrians. Suspension bridges for pedestrian are usually located in rural areas due to obstacles such as rivers, valleys or plantations. This paper presents a design of suspension bridge for pedestrian. The design refers to “Manual for Design and Build of Suspension Bridge for Pedestrian”. The suspension bridge is modeled using MIDAS Civil 2019. The output of the software is the internal forces consisting of moments, shear and normal forces used to design section properties and connection models. Based on the analysis and design process, obtained the dimensions of the bridge element; IWF.250.125.9.6 for the main girder, 150.100.9.6 for the cross girder, C.50.45.5.7 for the secondary girder, 250.250.14.14 for the pylon, L.50.50.5 for the bottom bracing, 60 mm for the main cable diameter, 20 mm for the hanging rod diameter, and 20 mm for the wind cable ties diameter.
The cable-stayed bridges are vulnerable to vibrations caused by earthquakes. This study focuses on the Sei Dareh Cable-Stayed bridge that is at a relatively high level of vulnerability based on the 2017 Indonesia earthquake map. In this research, the study discussed the response of the Sei Dareh cable-stayed bridge under eleven ground motion accelerograms. The analysis was based on linear elastic conditions, so that it obtained the natural frequency, maximum displacement in the middle of the span and the top of the pylon, the stress of the cable and edge beam, and dynamic amplification factor (DAF). The three-dimensional finite element model (3D-FEM) of the bridge was established. Then, the model was analyzed under eleven ground motion accelerograms that have been scaled using the local design response spectra. The study reveals that the first and second mode of structure is a vertical translation with 0,71s and 0,49s periods respectively. TCU060 and Tabas accelerogram ground motions caused the largest cable forces and stress contrary to the Imperial ground motions. The analysis results under eleven ground motions show that the top pylon and deck mid-span satisfy the PTI code allowable displacements. The dynamic amplification factor (DAF) is under 2,0 as the limit value.
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