2D-Modeling of Accordion Effect in Corrugated Steel Web and its Applicability

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  • 波形鋼板ウェブのアコーディオン効果の二次元モデルとその適用性
  • ハケイ コウハン ウェブ ノ アコーディオン コウカ ノ 2ジゲン モデル ト ソノ テキヨウセイ

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Prestressed concrete box girder with corrugated steel web is one of the promising concrete-steel hybrid structures applied to highway bridges. Prestress is efficiently induced into the top and bottom concrete flanges due to the so-called “accordion effect” of corrugated web. In this paper a simple 2-D analysis is presented to account for 3-D phenomena of the accordion effect using 2-D link-type elements. In the vertical direction, links are given a very high stiffness to fully transmit vertical shear force. In the horizontal direction, the link stiffness is given a value calculated from the out-of-plane bending of a folded plate forming each trapezoidal corrugation. Viability of the approach is demonstrated through comparison of experimental and numerical results on a large scale specimen of prestressed concrete beam with corrugated steel web.

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