中間スチフナをもつ熔接組立桁のウエブに生ずる撓み変形とその軽減対策

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Web plate of welded-built-up girder is distorted by the welding of stiffener as shown in Fig. 1. This distortion was measured in the girder as shown in Fig. 2. Stiffener arrangement is shown in Fig. 3. Distortion of each panel is given in Figs. 5 and 6. Maximum deflection of the panels except for the end panels 4 and 4' is about 2.1-2.5 mm, and it agrees with theoretical value obtained by eqs. (1)-(4). (see previous reports).As the method for decreasing the deflection of panel, we considered the following three methods : (1) Method of changing the stiffener space (l1). (see Table 1 and Fig. 7). (2) Method of using additional constraint as shown in Fig. 8. The results are shown in Table 2 and Fig. 9. (3) Method of preheating the back surface of web plate when welding the stiffener. The results are shown in Fig. 10 and Table 3.