KARAKTERISTIK FREKUENSI ALAMI JEMBATAN BALOK BETON BERTULANG T AKIBAT VARIASI GEOMETRI: STUDI PARAMETRIK
DOI:
https://doi.org/10.59003/nhj.v6i1.2284Keywords:
natural frequency, modal analysis, reinforced concrete bridge, bridge geometry, SAP2000Abstract
Natural frequency is an important dynamic parameter in evaluating bridge performance because it is influenced by structural geometry and stiffness. This study investigates the effect of geometric variations on the natural frequencies of reinforced concrete T-beam bridges using finite element-based modal analysis. A total of 27 bridge models were developed in SAP2000 with variations in span length (15, 20, and 25 m), slab thickness (180, 200, 250 mm), and bridge width (8, 10, and 12 m). the results indicate that natural frequencies increase with higher vibration modes. Increasing the span length significantly decreases the natural frequency, whereas increasing the slab thickness increases the natural frequency. In contrast, increasing the bridge width reduces the natural frequency. Among the investigated parameters, span length has the greatest influence on the natural frequency, followed by bridge width and slab thickness.
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