886 Materials and Structures(2008)41: 879-890 Table 4 Tensile strength, modulus of elasticity, and secant stiffness of glass fiber strap specimens Width of specimens Fmax(N 1.26mm(1 bundle)x7852429857469451.3143,433.3843,56291 27,70601 759759 75920.56 19.25 9.10 9.10 58mm(6 bundles)x4,933.72312.26490.971.4935,75062 29.6527.19 42.75 0. 4,996.90 3,93621 2,50343 8.7118.17 13.98 3.50mm(19 bundles)x17,376.00347.52546411.6032,220.6536,081.5622,94787 1,549.8431.00 48.740.298,921.61 641628 8.928.92 17.78 4.100mm(38 bundles)x31,901.15319.20501.891.4531,8990335,74069 22,731.07 s3.l12.7831.15 v9.769.76 97610.32 14.20 7.95 5.200mm(76 bundles)x63,020.10315.26495.691.1737,916.0841,38743 26,322.41 2,193.071097 17.250.16 683401 50.70 3,08504 v3.483.48 3.4813.49 l172 11.72 Fig. 6 The"force-strain diagrams of glass fibe traps without epoxy coating: (a)15.8 mm wide traps, (b)200 mm wide 158mm Strain(%) Strain ( Fig. 7(a) Testing of glass fiber strap 15.8 mm wide b)glass fiber strap after afte failure variation D= 5.28. The specimens of this type of 7 Influence of strengthening at the strap grip testing were all broken in the same way, regardless of areas on the tensile strength of glass fiber straps the test speed. The failure of fabric occurred in the jaws, although certain damage was visible in the jaws treatment at the area held by jaws, on th.r strap middle 150 mm length of specimens between rubbe The third testing showed the influence area as well of the strap. Although in previous specimens thevariation t = 5.28. The specimens of this type of testing were all broken in the same way, regardless of the test speed. The failure of fabric occurred in the middle 150 mm length of specimens between rubber jaws, although certain damage was visible in the jaws area as well. 7 Influence of strengthening at the strap grip areas on the tensile strength of glass fiber straps The third testing showed the influence of strap treatment at the area held by jaws, on the strength of the strap. Although in previous specimens the a) b) Fig. 6 The ‘‘force–strain’’ diagrams of glass fiber straps without epoxy coating: (a) 15.8 mm wide straps, (b) 200 mm wide straps Table 4 Tensile strength, modulus of elasticity, and secant stiffness of glass fiber strap specimens Width of specimens Fmax (N) fmax (kN/m) ffab (MPa) eFmax (%) E0.1–0.3% (MPa) E0.1–0.5% (MPa) Jmax 0.1–0.5% (kN/m) 1. 2.6 mm (1 bundle) x 785.24 298.57 469.45 1.31 43,433.38 43,562.91 27,706.01 s 59.63 22.67 35.64 0.27 8,362.03 3,963.05 2,520.50 m 7.59 7.59 7.59 20.56 19.25 9.10 9.10 2. 15.8 mm (6 bundles) x 4,933.72 312.26 490.97 1.49 35,750.62 38,508.17 24,491.20 s 429.65 27.19 42.75 0.27 4,996.90 3,936.21 2,503.43 m 8.71 8.71 8.71 18.17 13.98 9.10 9.10 3. 50 mm (19 bundles) x 17,376.00 347.52 546.41 1.60 32,220.65 36,081.56 22,947.87 s 1,549.84 31.00 48.74 0.29 8,921.61 6,416.28 4,080.75 m 8.92 8.92 8.92 18.33 27.69 17.78 17.78 4. 100 mm (38 bundles) x 31,901.15 319.20 501.89 1.45 31,899.03 35,740.69 22,731.07 s 3,112.78 31.15 48.98 0.15 4,530.61 2,841.73 1,807.34 m 9.76 9.76 9.76 10.32 14.20 7.95 7.95 5. 200 mm (76 bundles) x 63,020.10 315.26 495.69 1.17 37,916.08 41,387.43 26,322.41 s 2,193.07 10.97 17.25 0.16 6,834.01 4,850.70 3,085.04 m 3.48 3.48 3.48 13.49 18.02 11.72 11.72 Fig. 7 (a) Testing of glass fiber strap 15.8 mm wide; (b) glass fiber strap after failure 886 Materials and Structures (2008) 41:879–890