BALASTLI HIZLI TREN HATLARI İÇİN CAM LİFİ TAKVİYELİ KABLO KANALLARI

References (3)

1. cl HCL, pH 2.6 %7 cl HCL, pH 2.3 %13 8kg NaOH, pH 14 %14 The 9.8 MPa mean ultimate strength of the aged sample set
2. unexposed to corrosive agents (the "normal" set), was lower than its early ultimate strength value of 12.1 MPa shown in Figure 3 earlier. This is an expected behavior since it is determined that, the glass fiber reinforced material loses strength and ductility with time [8, 9]. The elastic strength limit is determined to increase with time and converge to the decreasing ultimate strength value. DESIGN, TESTING ANALYSIS AND FABRICATION OF THE CABLE DUCT Following the determination of the design load and the mechanical properties of the material, the duct design and analysis commenced. The duct design enabled elastic behavior under service loads and ductile failure under ultimate loads. The limited number of samples used for this study was not large enough to define statistically the characteristic bending strength value. Therefore, the design used the mean of the available bending strength results. Supplemented by the findings of the previous section, the possible effects of extreme contamination was judged to reduce the aged bending strength of the glass fiber reinforced material section
3. which was determined to be on average 9.8 MPa, by 15%. The design guidelines [8, 9] frequently use and specify the material factors based on un-aged material properties, which for the case presented herein was 12.1 MPa. Practical Design Guide for Design with GFRC by GRCA [8] addresses the load factor as 4 for dead load and 1.6 for live loads. Based on the Recommended Practice for Design with GFRC by PCI [9], the recommendation for the dead load factor is 1.4 and the live load factor is 1.7. Both guides recommend the material factor for un-aged materials as 0.25. Based on the findings about corrosion, an additional factor of 0,85 is accounted for the 15% bending strength loss. 5.1 Design Figure 1 shows the design loading case for the cable duct. The design considered the bending effect of the lateral load applied to the sidewall at a height of 7.5 cm from the base of the wall. With the known elastic and ultimate stress levels, the design outcome was the base and sidewall thickness (t) of the duct. The lateral service load (Fs) determined earlier was 70 kgf/m. For the design of the cable duct, the design ultimate load (Fud): = 1.7 * = 1.7 * 70 = 119 (2) The design moment (Md): = * 7.5 = 893 - (3) The design material ultimate strength (fud): = 0.25 * 0.85 * = 0