American Society of Civil Engineers

Bending Behavior of Steel Pipe Girders Filled with Ultralight Mortar

by Shun-ichi Nakamura, P.E., M.ASCE, (Prof., Dept. of Civ. Engrg., Tokai Univ., 1117 Kitakaname, Hiratsuka 259-1292, Japan. E-mail:, Tetsuya Hosaka, (Gen. Mgr., Railway Engrg., 2-14-2 Nagatacho, Chiyoda, Tokyo, Japan 100-0014), and Kenji Nishiumi, (Sr. Researcher, Nippon Steel Corp., Futtsu, Chiba, Japan 113-8656)

Journal of Bridge Engineering, Vol. 9, No. 3, May/June 2004, pp. 297-303, (doi:

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Document type: Journal Paper
Abstract: Bending behavior of steel pipes filled with ultralight mortar was studied by bending tests using a steel pipe, steel pipes filled with ultralight mortar, and steel pipes filled with light aggregate concrete and normal concrete. The steel pipe model filled with normal concrete had 1.8 times higher bending strength than the steel pipe model. The bending behavior of the steel pipe filled model with ultralight mortar was not improved when the compressive strength of the ultralight mortar was less than 1 MPa. However, ductility was much improved when the compressive strength was over 5 MPa, and the ultimate steel strain was more than double of the steel pipe model. The strains of steel and concrete in all the models were proportional to the distance from the neutral axis until the steel plate yielded. A simple analytical method was proposed to calculate the bending moments of the ultralight mortar filled steel pipes. The calculated values agreed very well with the test results.

ASCE Subject Headings:
Composite bridges
Maximum loads
Steel pipes