3/19/2021 0 Comments Plywood Template For Anchor Bolts
With this, the total design shear force for the connection is 1,600 lb (7.12 kN), with each anchor bolt resisting half of the total load.Both shear and tension are transferred through anchor bolts to resist design forces such as uplift due to wind at the top of a column or wall or vertical gravity loads on ledgers supporting joists or trusses (see Figure 1).The magnitude of these loads varies significantly with the application.
Post-installed anchors achieve shear and tension (pull out) resistance by means of expansion against the masonry or sleeves or by bonding with epoxy or other adhesives. The design of post-installed anchors should be in accordance with the anchor manufacturers literature and is beyond the scope of this TEK. Bent-bar anchor bolts must meet the material requirements of Standard Specification for Carbon Structural Steel, ASTM A36A36M (ref. Headed anchor bolts must meet the requirements of Standard Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength, ASTM A307, Grade A (ref. Allowable stress design values are limited to 20 of the average tested anchor bolt strength. Using strength design provisions, nominal design strengths are limited to 65 of the average tested strength. An overview of these design philosophies can be found in Allowable Stress Design of Concrete Masonry, TEK 14-7C, and Strength Design Provisions for Concrete Masonry, TEK 14-4B (refs. Plywood Template For Anchor Bolts Code Also IncludesNote that Chapter 5 of the code also includes prescriptive criteria for floor and roof anchorage that are applicable to empirically designed masonry, but these provisions are not covered here. The following discussion and topics apply to anchors designed by either the allowable stress or strength design methods. For bent-bar anchors, the effective embedment length is measured parallel to the bolt axis from the masonry surface to the bearing surface on the bent end minus one anchor bolt diameter. This requirement applies to anchor bolts embedded in the top of a masonry element as well as those penetrating through the face shells of masonry as illustrated in Figure 2. While research (ref. In the absence of such criteria, construction tolerances used for placement of structural reinforcement could be modified for application to anchor bolts. In order to keep the anchor bolts properly aligned during grout placement, templates can be used to hold the bolts within the necessary tolerances. Templates, which are typically made of wood or steel, also prevent grout leakage in cases where anchors protrude from the side of a wall. When the projected areas of adjacent anchor bolts overlap, the portion of the overlapping area is reduced by one-half for calculating A pt or A pv as shown in Figure 3. Any portion of the projected area that falls within an open cell, open core, open head joint, or falls outside of the masonry element is deducted from the calculated value of A pt and A pv. A graphical representation of a tension breakout cone is shown in Figure 4. For bent-bar anchors, the allowable axial tensile load must also be less than that determined by Equation 5 for anchor pullout. The strength reduction factors,, for use in Equations 11 through 18 are taken equal to the following values. For bent-bar anchors, the nominal axial tensile strength must also be less than that determined by Equation 13 for anchor pullout. The wall has a minimum specified compressive strength, f m of 2,000 psi (13.8 MPa). The bolts have an effective yield stress of 60 ksi (413.7 MPa) with and effective embedment length and spacing between bolts of 6 in.
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