The member stiffness in a bolted connection has a direct influence upon safe design with regard to both static and fatigue loading, as well as in the prevention of separation in the connection. This work provides a simple technique for computing the member stiffness in many types of bolted connections. Finite element analyses are performed for joints having a range of materials and geometries, and the results are generalized by nondimensionalization. An exponential expression for the stiffness is determined, and the results are compared with those of some of the techniques currently used.
The present study is dedicated to the reliability analysis of projectile penetration into a buried concrete target. The expressions for depths of penetration in the buried target have been derived for crater and tunnel regions separately. These penetration depths have then been employed for subsequent reliability analysis using First Order Reliability Method (FORM). Design points, important for probabilistic design, have been located on the failure surface. Sensitivity analysis has been carried out to study the influence of various random variables on projectile reliability. Some parametric studies have also been included to obtain some results of field interest.
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