Headed anchor rods

Headed anchor rods may be used in heu of headed studs to increase the embedment and assure ductile design, or if studs are not available. Design is similar to that for headed studs. The user must ensure that the anchor rod is made of a weldable material. 

Both rebar and headed anchor rods welded to an embedded plate can be cumbersome to handle since the lengths can be long. If this is undesirable for shipping or coating, a threaded coupler can be welded to the embedded plate and the rebar or anchor rods threaded to match. In this case the coupler weld would have to be sufficient to transfer the tension and shear loads. 

Figure 5.3 is a cut-away view of the FSV reactor core in a prestressed concrete reactor vessel (PCRV), with control rods inserted into the top of the core. The PCRV acted as a pressure vessel, containment, and biological shield. The bottom head had 12 penetrations for the steam generator modules, four penetrations for the helium circulators, and a large central opening for access. A 3/4 in.-thick carbon steel liner anchored to the concrete provided a helium-tight membrane. Two independent systems of water-cooled tubes welded to the concrete side of the liner and kaowool fibrous insulation of the reactor side of the liner limited the temperatures in both the liner and the PCRV. 

This chapter provides the basic materials, properties, and corrosion protection recommendations for holt and rod assemblies, headed studs, post-installed anchors, and shear lugs. The engineer must select the proper material, considering properties such as grade, yield strength, tensile strength and weldability and provide for corrosion resistance so that the anchorage will perform as required and intended. 

Furthermore, the anchor capacity can be designed by first computing Ra,across bond length and limits Ra,(1 to bond inside full stone sections (Ab/Ag4 = 1 completely in stone Ab/Ag,(J < 1 in joint) ... 

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