Structural Analysis and Renovation by Zihai Shi & Masaaki Nakano & Yoshifumi Takahashi

Author:Zihai Shi & Masaaki Nakano & Yoshifumi Takahashi
Language: eng
Format: epub
Publisher: De Gruyter Open
Published: 2015-11-02T16:00:00+00:00

Photo 5.1: Interfacial debonding of renovated pipe specimens at failure loads: (a) a circular pipe specimen; (b) a box-culvert pipe specimen

The following discussion is based on numerical studies of the fracture tests of two renovated pipe specimens, a box-culvert pipe (1500Γ1500 mm) and a circular pipe (ϕ 1000 mm), as defined in Case 2 of Table 3.2 and Case 4 of Table 3.3. Structural dimensions and renovation details are shown in Fig. 3.2(a) and Fig. 3.3(a), and test conditions are shown in Fig. 3.4. Tables 3.4 and 3.5 summarise the material properties of the original pipe and the renovation layer for each case, respectively.

Figure. 5.5 shows schematic illustrations of the structural deformations during the external pressure tests. As seen, under the compressive loads multiple tension zones develop in the renovation layer, which is generally thinner than the plates and the walls of the original pipe and structurally functions like a tension member. In these tension zones tensile stress normal to the axis of the tension member may occur at the interface, and its occurrence can be attributed to the Poisson effect, the interfacial shear transfer, the hardening shrinkage of the fill mortar and its self weight. As mechanical connectors are not used to integrate the original pipe and the renovation layer, the complete integration of structural components required by the Guidelines depends solely on the direct tensile strength of the fill mortar.

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