应用正交各向异性钢面板提高钢桁架桥库存等级系数

Erik Wahyu Pradana, A. Triwiyono, A. Awaludin, S. Mandal
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引用次数: 0

摘要

目前,印尼已经建成了18648座桥梁,总长510,366公里,但只有86%的桥梁完好无损,其余的都遭到了破坏。钢桁架桥的损伤一般发生在钢筋混凝土桥面,其修复通常通过更换桥面或使用正交异性钢桥面(OSD)面板进行。在印度尼西亚,这种方法只在2009年的Citarum I桥和2013年的Cisadane桥上得到了有限的应用,而对现有钢桁架桥的影响尚不清楚。因此,本研究旨在通过数值模拟来评估钢桁架桥在OSD面板复盖后的性能。采用网格尺寸为50x50mm的壳单元和钉住边界条件,在ABAQUS CAE上进行了OSD面板的微建模。在这一阶段,假定材料具有小变形的弹性。以Bina Marga设计标准的a级钢桁架桥为研究对象,通过对比现有桥梁库存等级系数(RC桥面)和OSD面板重装(桥面重装是桥梁减重的指标),对钢桁架桥的性能进行了评价。基于SAP2000建立的结构宏观模型,桥梁自重使钢桁架桥主体的轴向拉力和轴向压缩力分别降低20.6% ~ 24.6%和20.5% ~ 24.5%。因此,这增加了9.3%-9.5%的库存评级因子。换句话说,使用比现有RC桥面更轻的OSD面板增加了钢桁架桥在整个使用寿命中抵抗活荷载或车辆额定荷载的能力。
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Increasing Inventory Rating Factor of Steel Truss Bridge Through Orthotropic Steel Deck Panel Application
Currently, 18,648 bridges with a total length of 510,366 km have been constructed in Indonesia, but only 86% are in good condition, while the rest are damaged. Steel truss bridge damage generally occurs on the RC decks, and its repair is often implemented through deck replacement or redecking using Orthotropic Steel Deck (OSD) panel. In Indonesia, this method has only been applied limitedly at the Citarum I Bridge in 2009 and the Cisadane Bridge in 2013, while the effect on the existing steel truss bridge is unknown. Therefore, this study aims to evaluate the steel truss bridge performance after OSD panel redecking through numerical modeling. The design process of the OSD panel was carried out by micro-modeling on ABAQUS CAE using shell elements with a mesh size of 50x50 mm and pinned boundary conditions. In this stage, the materials were assumed to be elastic with small deformations. The evaluation of steel truss bridge performance was performed on the A-class steel truss bridge Bina Marga design standard with a 60 m span by comparing the existing bridge inventory rating factor (using RC decks) to OSD panel redecking, which is an indicator of bridge self-weight reduction. Based on the structural macro-model developed using SAP2000, the bridge self-weight reduced the axial tension and compression forces on the steel truss bridge mainframe by 20.6%-24.6% and 20.5%-24.5%, respectively. Consequently, this increased the inventory rating factor by 9.3%-9.5%. In other words, using the OSD panels lighter than the existing RC decks increases the steel truss bridge capacity to resist the live load or vehicle rating throughout its service life.
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审稿时长
15 weeks
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