STRUCTURAL AND CONSTRUCTION METHOD DESIGN OF ELEVATED WALKWAY IN KELAPA GADING

• Main Author: Rahmadian Zulfi, Akmal
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68668
• Institution: Institut Teknologi Bandung

The existence of Kelapa Gading roundabout as a traffic-densed area and full of social activities creates an opportunity to build a new library as a public space and an elevated walkway as an access for pedestrians around the roundabout. The elevated walkway is built above the Kelapa Gading roundabout and beneath the LRT line and Kelapa Gading – Pulo Gebang toll road. The walkway structure is designed to be on par with the first level floor of the library which is 6 meters above ground. To anticipate collision, the walkway and library building is separated by a dilation due to the different behavior between the two structures. The elevated walkway consists of straight and curved spans with a diameter of 107 meters, and has a width of 4 meters for the pedestrian path. The length of this bridge is 300 meters which is divided into 8 spans. The girder structure of the elevated walkway is designed using steel profile materials that are supported by reinforced concrete pier structures. With a curved shape and limitation of the available steel profile span, the girder of the elevated walkway is divided to several segments that are connected to each other to form a unity. Structural modeling and analysis were done separately between the girder and pier structures with the help of SAP2000 software. The steel structure consists of girder, cross girder, and bracing elements, while the pier structure consists of pier beam and column elements. The design of elements, connection, supports, and reinforcement refers to the applicable standards. The construction method for the elevated walkway structure is designed by considering the quality of work, safety, construction speed, and construction feasibility at the project site. The execution will be done by fabricating the girder segment first before being installed at the location. Installation and lifting is done per segment by the lifting equipment. Each girder segment is installed phase by phase with the help of scaffoldings as temporary support for the structure to avoid large deflection during the construction stage. The lifting equipment has sufficient capacity to lift 1 girder segment. The lifting equipment is the SANY STC1000C mobile crane with a maximum lifting capacity of 100 tons and 8 mobile cranes is used to be able to reach the installation work of each segment in each span. The use of scaffolding and lifting equipment is designed in accordance to site conditions with existing infrastructure at the project site. During construction, vehicular traffic at the Kelapa Gading roundabout can still operate even though partially of the road is used for the construction area which is restricted with the project guardrail.