加勁材對鋼橋柱耐震行為之影響

鋼橋柱常在地震時產生柱板局部挫屈，甚而導致斷裂，形成主因是柱板勁度不足，本研究探討柱板加勁方式及加勁量對鋼橋柱耐震行為之影響，透過一系列的結構破壞試驗來探討現行設計規範中對柱板加勁量規定是否符合耐震需求，其中加勁材的種類包含縱向加勁板、橫隔板及柱充填混凝土加勁等。研究結果顯示，目前規範對柱板加勁量之規定雖可滿足強度、勁度需求，惟其所能提供之韌性仍嫌不足，研究發現若將現有規範之勁度需求值提高3.4倍，將可大幅增進其耐震韌性。而於橋柱中充填混凝土，雖可增加鋼橋柱之耐震能力，惟充填混凝土比例過高時將導致柱底基礎發生破壞，本研究亦建議評估強度之方法以確保橋柱之耐震能力。

關鍵字

橫隔板；能量消散；充填混凝土鋼橋柱；縱向加勁板；鋼橋柱

並列摘要

Steel bridge column is prone to buckle on its component plates during the earthquake event. This type of local buckling is usually due to the lack of enough stiffness and may leads to fracture under the excursion of seismic force. This reported research examined different ways of stiffening the steel column plates. Series of experimental studies were carried out to examine the behavior of longitudinal plate stiffeners, horizontal diaphragm plate stiffeners, and the effect of concrete-filled. From these studies, it is found that the stiffness requirement of steel column plate in the current design specification is able to provide enough stiffness and strength of the steel column. However, the stiffness needs to be increased to 3.4 times in order to archive good ductility. It is also found that the height of the concrete-filled is an important parameter in the seismic performance of steel column. The method for strength evaluation is also suggested to ensure the seismic resistance of steel bridge column.

並列關鍵字

diaphragm ； energy dissipation ； concrete-filled steel bridge column ； longitudinal stiffener ； steel bridge column

國際替代計量

加勁材對鋼橋柱耐震行為之影響

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