*2.1. Design of Specimens*

In this study, the dimension for the short-lapped-rebar splices was 200 mm × 200 mm × 300 mm, as shown in Figure 4. A corrugated metal duct with 300 mm in length, 40 mm in diameter, 0.2 mm in wall thickness, and 5 mm in wave height was utilized. The spiral hoops diameter was selected as 8 mm and three different diameters of rebar (i.e., 12 mm, 16 mm and 20 mm) were selected as the anchored rebar or the embedded rebar. The rebar at the anchorage end was 200 mm longer than the splices and the rebar at the loading end was 350 mm longer than the splices considering the length of the loading jack, as shown in Figure 3. The inner diameter and the spacing of the spiral hoops are 75 mm and 50 mm, respectively.

**Figure 4.** *Cont*.

**Figure 4.** Precast construction process. (**a**) Mold with spiral hoops, rebar, and duct (**b**) Grout pouring (**c**) Anchored rebar with the locators (**d**) Arrangement of strain gauges.
