Shear design strength

The minimum of the following strengths should be taken as the shear design strength, V of the anchorage. 

The largest design dependent strength variable is material strength, either ultimate tensile strength (Su), uniaxial yield strength (Sy), shear yield strength (Ty) or some... 

Compression shear tests are also commonly used. ASTM D 2182 describes a simple compression specimen geometry and the compression shear test apparatus. The compression shear design also reduces bending and, therefore, peeling at the edges of the laps. Higher and more realistic strength values are obtained with the compression shear specimen over the standard lap shear specimen. 

For the best possible performance, joints should be specifically designed for adhesive bonding. In a few cases only can an adhesive be used on a joint not specifically designed for adhesives - mainly cylindrical joints. Bond stresses, materials, type of adhesive, surface preparation, methods of application and production requirements can then all be considered in relation to each other at the outset. The designer should consider especially the effect of shear, tension, cleavage and peel stresses upon the joint (Fig. 1) (see Joint design strength and fracture perspectives). 

According to (fib 2012), the design value of shear resistance of a bar with diameter da and design yield stress/y, working as a dowel per Fig. 15.1a in a concrete with design strength/cj, increases with the slippage at the interface, s, as ... 

The value of the design strength of shear strengthened members can be computed... 

Collins, M.P. Porasz, A. 1989. Shear Design for High Strength Concrete, Proceeding of Workshop on Design Aspects of High Strength Concrete. Comite Euro-International du Beton Bulletin d Information. CEB. Paris, pp. 77-83. 

As a result, beam-column joints are susceptible to shear failure which generally involves a brittle process. Such brittle shear failure must be avoided through appropriate design to ensure ductile response of the frame. Despite the importance of shear design of RC beam-column joints, the research community has not yet developed a commonly accepted approach for the determination of the shear strength of RC beam-column joints, probably due to the complexity of joint behavior. 

If the geotextile reinforcement of width B resists design strength P, the length of anchorage for the two cases of direct shear and pull-out modes is as follows (Eqs. [15.19] and [15.20]) ... 

Adhesives for ceramic tiles are specified by the standard EN 12004 2007 (Adhesives for tiles. Requirements, evaluation of conformity, classification, and designation), and includes performance requirements for cementitious, dispersion, and reaction resin adhesive types for all internal and/or external wall, floor and ceiling applications. Annex ZA, of this standard, sets out the requirements, which address the provisions of the Construction Products Directive (see O Sect. 35.4 below), and include assessments of durability. Compliance with these requirements confers a presumption of fitness for purpose for the applications and form part of a CE mark. In these cases durability is assessed by elevated temperature and/or water immersion accelerated ageing or freeze-thaw cycling of test specimens and then determining tensile or shear adhesion strength against minimum requirements. 

Ultrasonic Welding. Ultrasonic welding has been appHed to Tefzel with weld strength up to 80% of the strength of the base resin. Typical conditions include a contact pressure of 172 kPa (25 psi) and 1—2 s cycle time. The two basic designs, the shear and butt joints, employ a small initial contact area to concentrate and direct the high frequency vibrational energy. 

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