6.4Design Strength Due to Block Shear

The strength as governed by block shear at an end connection of plates and angles is calculated as given in 6.4.1.

6.4.1 Bolted Connections

The block shear strength, $T_{\mathrm{db}}$ of connection shall be taken as the smaller of,

$\begin{aligned} T_{\mathrm{db}} & =\left[A_{\mathrm{vg}} f_{y} /\left(\sqrt{3} \gamma_{\mathrm{m} 0}\right)+0.9 A_{\mathrm{tn}} f_{u} / \gamma_{\mathrm{ml}}\right] \\ \text { or }\end{aligned}$

$T_{\mathrm{db}}=\left(0.9 A_{\mathrm{vn}} f_{\mathrm{u}} / \left(\sqrt{3} \gamma_{\mathrm{ml}}\right)+A_{\mathrm{tg}} f_{\mathrm{y}} / \gamma_{\mathrm{m} 0}\right)$

where

• $A_{\mathrm{vg}}, A_{\mathrm{vn}}=$ minimum gross and net area in shear along bolt line parallel to external force, respectively (1-2 and 3-4 as shown in Fig. 7A and 1-2 as shown in Fig. 7B),
• $A_{\mathrm{tg}}, A_{\mathrm{in}}=$ minimum gross and net area in tension from the bolt hole to the toe of the angle, end bolt line, perpendicular to the line of force, respectively (2-3 as shown in Fig. 7B), and
• $\begin{aligned} f_{u}, f_{y} & =\text { ultimate and yield stress of the material } \\ & \text { respectively. }\end{aligned}$

6.4.2 Welded Connection

• $\begin{aligned} A_{\mathrm{e}} & =\text { effective sectional area as defined } \\ & \text { in } 7.3 .2 \text {, and }\end{aligned}$

The block shear strength, $T_{\mathrm{db}}$ shall be checked for welded end connections by taking an appropriate section in the member around the end weld, which can shear off as a block.