ANALISIS KUAT LAYAN STRUKTUR ATAS JEMBATAN (BALOK MENERUS) AKIBAT RUNTUHNYA SALAH SATU PILAR JEMBATAN (STUDI KASUS JEMBATAN GANTIWARNO, KLATEN, JAWA TENGAH)
ABSTRACT: The upper
structure of the
Gantiwarno bridge in
Klaten, Central Java,
was built using
the continuous concrete beam bridge structure, which was
supported by abutment at the ends and two pillars between them. In its service,
one of the pillars had collapsed causing the inability of the upper bridge
structure to provide support for the necessary loads. This study aims to
observe; 1) the moment resistant of the main concrete beam section and its
difference compared to the positive and negative maximum moment produced from
the result of SAP90; 2) deflection and natural frequency value of the bridge
in the normal
condition of the upper
structure and in
the damaged condition.
Through the observations,
the study intends to
understand the remaining
strength of the
upper structure, due
to the collapse
of one of
the pillars, in supporting the services load. The result
showed that the percentage of the “D” load allowed to pass the bridge structure
in its damaged condition is 2.7859% (motorcyclists were still able to pass the
bridge). There was a significant decrease of 68.312% of the structure natural
frequency in its damaged condition. The deflection in its normal conditions was
far from the maximum deflection permitted. It was also the case in its damaged
condition. Therefore, the service strength of this bridge is determined by the
moment resistant of the existing main concrete beam section and not by the
deflection.
Keywords: continuous concrete
beam, moment resistant, damaged condition
Penulis: Bambang Supriyadi
Kode Jurnal: jptsipildd080011
