Monotonic Testing of Steel Anchor Straps for Alternative Installation Methods in Wood Frame Shear Walls
Metal wood-connection hardware straps are sometimes installed in ways not intended by the manufacturers; in particular, a shear-wall anchor strap which was manufactured to be used in straight alignment to connect a post above a particular floor of a building to a post below that floor may instead be bent and wrapped around a floor beam. Four specimens using steel straps were constructed and tested in order to simulate building situations. The experimental specimens had wooden posts and
... d-wood floor beams, connected by straps, arranged so that the load paths passed through the straps being tested; the control specimens had post-to-post connections. The specimens were tested monotonically by applying tension, in order to determine whether the performance of the straps was altered when installed in bent configurations. Two tests on each of the MSTA36 and CMSTC16 steel straps intended for wood-connection, manufactured by Simpson Strong-Tie, Inc., were performed, and results were measured. No fracture occurred at a strap bend. All specimens showed evidence of post-yield elongation at time of fracture. Neither of the two straps which were wrapped around the floor beam showed any reduction-of-effective-capacity effect due to the bending of the straps at the corners of the beam. The results suggest that metal straps may, in the situation tested, be used effectively in bent and wrapped configurations. v ACKNOWLEDGMENTS I gratefully acknowledge the help and supervision of my advisor, Professor Kurt McMullin of the Department of Civil and Environmental Engineering on all phases of this project. Professor McMullin suggested the topic of the experiments. He answered my questions regarding the experiments, and advised me both in designing the specimens and in preparing this thesis. He participated in the testing of the specimens. He read draft versions of the thesis and made useful recommendations. I also thank the laboratory technician Patrick Joice, for his work in preparing the laboratory specimens, and for helping me with my portion of the specimen construction.