TESTS AND ANALYSIS OF MIXED WOOD-CONCRETE BEAMS (PRELIMINARY REPORT)

As concrete and wood are low cost materials and require low skill levels in construction, their combined use as bridge materials is attractive to rural settings. Concrete is strong in compression and weak in tension. Wood is strong in tension parallel to grain but subject to buckling in compression. Thus, composite T-beams constructed to stress concrete in compression and wood in tension may have performance advantages for bridges. Basic research on the composite behavior of mixed concrete-wood beam construction is a first step toward understanding their potential use in bridge constructions. This project included two laboratory studies and analytical work dealing with T-beams comprised of a concrete flange connected to wood beam plus plywood sheathing. Based on the experimental results of tests of 72 slip specimens and 4 full-scale layered T-beams, the mechanical behavior of different materials in layered structure was studied. In the slip tests, concrete-wood members were tested for two different ages of concrete, 4 types of nails and two different embedment lengths. The slip modulus and ultimate load of each specimen were determined after testing. In T-beam bending tests, the deflection and the interlayer slip were measured at varying load level. The experimental results of the T-beam tests are compared favorably to theoretical values that were obtained by use of an existing computer program, FEABEA, originally configured for composite wood to wood construction. The report is organized in eight chapters as follows: (1) Introduction; (2) Literature Review; (3) The Mathematical Model for a T-Beam; (4) Testing Equipment and Procedure; (5) Properties of Materials; (6) Experimental Results; (7) Verification of the Mathematical Model; and (8) Summary and Conclusions. There are three appendices as follows: (A) The Load-Slip Curves of Slip Tests; (B) The Load-Deflection Curves of T-Beam Bending Tests; and (C) Comparison of the Theoretical and Experimental Results of T-Beam Specimens.

• Record URL:
  https://www.ugpti.org/resources/reports/details.php?id=302
• Corporate Authors:

  Mountain-Plains Consortium

  North Dakota State University
  Fargo, ND  United States  58108
• Authors:
  • Chen, T-M
  • Gutkowski, R M
• Publication Date: 1993-3

Language

• English

Media Info

• Media Type: Digital/other
• Features: Appendices; Figures; Photos; References; Tables;
• Pagination: 189 p.

Subject/Index Terms

• TRT Terms: Alternatives analysis; Beams; Bend tests; Breaking loads; Composite materials; Computer programs; Deflection; Guides to the literature; Laboratory tests; Literature reviews; Mathematical models; Slip (Fluid mechanics); T beams; Test procedures; Testing equipment; Tests
• Uncontrolled Terms: Bending tests; Composite beams; Interlayer slip
• Old TRIS Terms: Composite behavior; Layered system mechanics; Slip moduli; Slip tests; Test results; Theoretical values; Wood-concrete beams
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 00633264
• Record Type: Publication
• Report/Paper Numbers: MPC Rept No. 93-18-A
• Files: TRIS
• Created Date: Jun 4 1993 12:00AM