| Penulis/Author |
Angga Trisna Yudhistira (1) ; Angga Fajar Setiawan, S.T., M.Eng., Ph.D. (2); IRFANI NURUL HUDA (3); Budi Suanda (4); Ir. Ali Awaludin, S.T., M.Eng., Ph.D., IPU., ACPE. (5) |
| Abstrak/Abstract |
Heavy equipment transportation has become the biggest challenge in the
implementation of a powerplant project in Central Borneo, Indonesia. The road
structure composition was subgrade only, and a simple log bridge only connected
several river crossings. One of the longest bridges was Palili Bridge, with a 29-m
span. The existing Palili bridge was used for logging trucks with operation load
50–60 ton. While the heaviest equipment in the powerplant project is a Gas Engine
with a weight of 105 tons, the structural modification shall be done. The log girder
span was modified to be 18.00 m so that a couple of 5.50 m cantilever log abutment
was constructed. Also, the main span and abutment improvement were conducted
to resist 105 tons of load. The objectives of this research were to investigate the
structural performance of the strengthened Palili Bridge under 105 tons of vehicle
load with the safety criteria. In the structural investigation, direct loading test under
static and dynamic load was conducted. Bridge displacement was monitored at half
and a quarter of span. Furthermore, a numerical analysis of the Palili Bridge was
conducted by using SAP2000 software to verify the testing result. As the direct
loading test result, both static and dynamic fulfilled the corresponded regulation.
Based on the log girder span displacement monitoring, and the numerical analysis
result, the bridge could resist the loads with safety factor 3.57 on the main span and
2.46 on the cantilever abutment. The computed maximum displacements considering
composite action were 7.72 and 8.79 mm for static and dynamic load, respectively,
less than the limit of 40.28 mm (L/360). Based on the result, the design and concept
of the log bridge were proved to be feasible and could be applied in any other similar
site condition. |
