Author(s): CHUN Qing, CHEN Chunchao, PAN Jianwu, Key Laboratory of Urban & Architectural Heritage Conservation, Ministry of Education, Southeast University, College of Civil Engineering, Southeast University, Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics
Pages: 1659-1665
Year: 2014 Issue:  5
Journal: Journal of Central South University of Technology
Keyword:  timber stitching beam; bending bearing capacity; plane hypothesis;
Abstract: In order to study the bending behavior including failure mode and bending bearing capacity and strain distribution at mid-span section of timber stitching beams with big top and small bottom, the bending tests on eight specimens with traditional conformation were carried out. Based on the theoretical analysis and the experimental results, the computing formulas of bending bearing capacity of this kind of timber stitching beams made of pine and fir were presented. The results show that the failure modes of this kind of stitching beams are all the brittle breaking at the bottoms of the top beams for the stitching pine beams and the stitching fir beams. The distribution of the section strain along the height of the stitching timber beam basically obeys plane hypothesis. Moreover, in order to avoid the early brittle failure of the stitching beam, the wood knot should not be put on the tensile side of beam.