Development of Fire Protection Panel in Steel-Concrete Composite girder bridge

最近，日本和国外因油罐车翻车事故、纵火等原因引发的桥梁火灾袭击事件有增加的趋势。日本此类事故的一个例子是2008年8月初发生在大都会高速公路池袋线上的事故。在这种情况下，由于支撑区的剪切屈曲，钢梁的高度从1200 mm下降到700 mm。因此，这条城市快速路关闭了大约两个半月进行维修。根据大都会高速公路有限公司的公告，这起事故造成的经济损失约为45亿日元。为防止火灾对桥梁造成严重破坏，建议高架桥或普通桥梁在火灾发生概率较高的情况下，采用防火保护板(以下简称FPP)。进行了钢-混凝土组合梁加装FPP和不加FPP的火灾试验。本文报道了FPP的概况和钢梁内温度分布的试验结果。

Recently, the fire attack for the bridges due to turning over accident of a tank lorry vehicle, incendiary fire and so on trends to increase in Japan and also in foreign countries. One of the examples of such accident in Japan occurred in Ikebukuro line of Metropolitan Expressway at the beginning of August in 2008. In this case, the height of the steel girder was sunk from 1200mm to 700mm due to shear buckling in the region of the support. As a consequence, this urban expressway was closed about two and half months for repairs. According to the announcement of Metropolitan Expressway Company Limited, the economic loss by this accident reached to approximately 4.5 Billion Yen. To prevent a serious damage of the bridge due to fire attack, the authors have been proposed the adoption of Fire Protection Panel (hereafter referred to as FPP) for the viaduct or normal bridge only where they have high occurrence possibility of fire accident. The author carried out the fire test of steel-concrete composite girder with and without FPP. This paper reports on the outline of the FPP and the experimental results of the temperature distributions in the steel girder.