No. A shield essentially occupies one hand, meaning that if you're using a shield in that hand, you're not legally using another object in that hand.
How that works: If I'm using a buckled shield and a two-handed weapon, and someone strikes the shield, that actually counts as a legit hit against me. Likewise, if I'm using a buckled shield on my left arm, and a shortsword in my left hand, and someone strikes the buckled shield, I take the hit.
Does that help?