Timber Frame Tension Joinery - Timber Frame Engineering Council

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material needed in direct tension. 21
3.5 Additional Yield Model Equations A comprehensive mortise and tenon yield model will need to include the existing four NDS yield modes for double shear and the three additional yield modes, specific to mortise and tenon connections. The existing NDS modes are based on peg bearing and bending, and the proposed yield modes will account for combined shear and bending, relish failure, and mortise splitting. The first proposed yield mode will be known as Mode V, for purposes of discussion, and takes into account the effect of the combined bending and shear behavior of the connection (Fig. 3-7). The double shear strength for n pegs is the following: P =2nF ⊥ A (3-32) V v Where F v ⊥ is the vertical shear strength of the wood peg and A is the cross-sectional area of the peg. This equation takes into account the combined bending and shear effects by using an allowable shear strength that is determined by testing as shall be described in the next section. The relish failure mode shall be known as Mode VI (Fig. 3-8) and is related to the distance from the center of the peg to the end of the tenon (l v ), the tenon thickness (t m ), peg diameter (D), and the horizontal shear strength of the tenon (F vm ). P =2 ⎛ D VI nFvmtm l - ⎞ ⎜ v ⎟ (3-33) ⎝ 2 ⎠ In the case of the mortise material splitting, known as Mode VII (Fig. 3-10), no specific test or numerical model has been devised to quantify the strength of the material around the mortise. Therefore, minimum edge distances, such as those required by the NDS, shall be developed to ensure that this failure mode does not control. 22
Page 1 and 2: TIMBER FRAME TENSION JOINERY Richar
Page 3 and 4: Acknowledgments Acknowledgments go
Page 5 and 6: 5.4 Dowel Bearing Test Results.....
Page 7 and 8: List of Figures Page Figure 1-1 Typ
Page 9 and 10: List of Appendices Page Appendix A
Page 11 and 12: elasto-plastic behavior an ideal yi
Page 13 and 14: normal distribution orthotropic mat
Page 15 and 16: xiii
Page 17 and 18: Tie Beam Figure 1-2 American Timber
Page 19 and 20: 2. Timber Framing Background 2.1 Hi
Page 21 and 22: territories. Using the new construc
Page 23 and 24: Although timber framing is still a
Page 25 and 26: 3. European Yield Model and Propose
Page 27 and 28: strength, then the dowel could bend
Page 29 and 30: P III s = k3 ⋅D⋅ts ⋅F ( 2 + R
Page 31 and 32: The areas under the shear diagram c
Page 33 and 34: and F es = 1728 psi) (see Sections
Page 35: Figure 3-7 Combined Shear - Bending
Page 39 and 40: need to know the required load and
Page 41 and 42: Using the equivalent bolt diameter,
Page 43 and 44: 4. Peg Testing Procedures and Analy
Page 45 and 46: dowel diameter and the intercept of
Page 47 and 48: were taken for two orientations (e.
Page 49 and 50: affected by the deformation in the
Page 51 and 52: Figure 4-6 Orientation of Prelimina
Page 53 and 54: The main purpose of the full-size t
Page 55 and 56: 5. Test Results 5.1 Introduction Th
Page 57 and 58: Table 5-1 Bending Test Correlation
Page 59 and 60: Table 5-4 Bending Yield Strength Re
Page 61 and 62: 5.3 Shear Test Results 181 shear te
Page 63 and 64: 0.90 0.90 Specific Gravity 0.80 0.7
Page 65 and 66: Yield Stress τ (psi.) 3/4" Red Oak
Page 67 and 68: 5.4 Dowel Bearing Test Results The
Page 69 and 70: obtained from shear tests at variou
Page 71 and 72: To obtain allowable stress design v
Page 73 and 74: l e l v Figure 6-1 Full-size Test D
Page 75 and 76: each mode in the general yield mode
Page 77 and 78: 7. Conclusions and Recommendations
Page 79 and 80: Appendix A Derivation of Dowel Rota
Page 81 and 82: Appendix C NDS Yield Mode II, Alter
Page 83 and 84: Appendix D NDS Mode III s , Alterna
Page 86 and 87:
Appendix E Standard Test Setup for
Page 88 and 89:
Appendix G Bending Test Data Summar
Page 90 and 91:
Summary of Bending Tests: Last Revi
Page 92 and 93:
Appendix H Shear Test Data Summary
Page 94 and 95:
Summary of 1-1/4" Red Oak Shear Tes
Page 96 and 97:
Summary of 1" White Oak Shear Tests
Page 98 and 99:
Appendix I Dowel Bearing Data Summa
Page 100 and 101:
Bibliography Abe M., and Kawaguchi,
Page 102:
Soltis, L. A.; Karnasudirdja, S.; L
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