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A proper evaluation of effective moment of inertia involved tensile cracking effect and tension stiffening effect is an
important consideration in the design of one-way composite slabs reinforced with structural steel decking. Especially common
uses of high-strength reinforcing structural steel decking and shallow sections caused serviceability problem of one-way
composite slabs to be of more importance. Methods to evaluate effective moment of inertia and allowable span-depth ratio for
controlling deflection in one-way composite slabs were developed. A new presented formula for effective moment of inertia can
apply to simple as eliminating the necessity of computing moment of inertia of cracked section. Allowable span-depth ratio that
limitation of long-term deflections will be satisfactory considered loading conditions, support conditions, deck plate ratio, span
length, and allowable deflections in ACI 318-02. The proposed methods in this study show a more justifiable than other
procedures such as ACI 318-02 and ANSI/ASCE.