鋼浪腹鈑外置預力橋結構行為之分析與探討

鋼浪腹鈑外置預力橋為一種新穎的橋梁結構型式，乃是採用鋼浪腹鈑取代傳統箱梁之混凝土腹板。如此一來，可減少混凝土之使用量，有效地減輕自重，並可提高抗剪強度。鋼浪腹鈑有特殊「手風琴效應」之結構行為，可容許橋梁沿著軸向有伸縮之變形，故鋼浪腹鈑不承受軸力以及撓曲，因此使得預力系統能夠更有效的導入混凝土翼板內，大大的提升預力施加之效率。故使用鋼浪腹鈑有橋梁輕型化、經濟性、外觀優美、提高橋梁之剪力強度以及施工快速等優點，其結構行為的探討便顯得相當的重要。本文採用有限元素分析軟體ANSYS v11.0模擬分析鋼浪腹鈑外置預力橋之結構行為，分析模式中考慮了幾何非線性以及材料非線性。文中針對鋼浪腹鈑與鋼翼板I型梁、鋼浪腹鈑與混凝土翼板I型梁做研究，將分析之結果與其真實試驗結果兩者作比對，說明本文之分析可有效模擬鋼浪腹板外置預力橋之結構行為，並且能夠了解其細部之應力分佈情形，冀望該分析結果能夠對於以後設計該類型腹板之橋梁提供參考。

關鍵字

鋼浪腹鈑；有限元素法；預力混凝土

並列摘要

Prestressed girder with corrugated steel web is a new type of structure. In which, the corrugated steel web is employed to replace web of the traditional concrete box girder. Therefore, it can reduce the use of concrete as well as self-weight effectively, and increase shear strength of the web. The “accordion effect” of corrugated steel web is a special structure behavior that allows axial telescopic of displacement with girder, accordingly, the corrugated steel web doesn’t take axial force and flexural bending so that the prestress can be eﬃciently introduced into the concrete flange. The use of corrugated steel web has many advantages such as light girder, economy cost, artistic appearance, high shear strength and rapid construction. The application of it to practical bridge engineering becomes popular in last decade, the study on its structure behavior is thus important. In this study, the famous finite element software of ANSYS v11.0 was used for simulation and analysis on structure behavior of corrugated steel web. Effects of geometric and material nonlinear were taken into account. The reported experimental results of steel and concrete I-girders with corrugated steel web were served as case studies. The results of analysis were compared with those of experiment. It shows that the analysis is consistent to the actural behavior within acceptable precision. The results obtained might benefit the design of this type girder in the future.

並列關鍵字

Corrugated steel web ； Finite Element Method ； Pre-stress concrete

參考文獻

[1] Abbas H. H., Sause R. and Driver, R. G., "Analysis of Flange Transverse Bending of Corrugated Web I-Girders under In-Plane Loads," Journal of Structure Engineering, 2007, pp.347-355.

[2] Abbas H. H., Sause R. and Driver, R. G., "Simpliﬁed analysis of ﬂange transverse bending of corrugated web I-girders under in-plane moment and shear," Engineering Structures, No.29, 2007, pp. 2816–2824.

[3] ANSYS User’s Manual version 11.0,Swanson Analysis Systems,Inc, 2007

[4] Chawalit M., Eiichi W. and Tomoaki U., "Shear Buckling of Corrugated Plates With Edges Elastically Restrained Against Rotation," International Journal of Structural Stability and Dynamics, Vol. 4, No. 1, 2004, pp. 89–104.

[5] Driver, R. G., Abbas H. H., and Sause R., "Shear Behavior of Corrugated Web Bridge Girders," Journal of Structure Engineering, 2006, pp.195-203.

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鋼浪腹鈑外置預力橋結構行為之分析與探討

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