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Kiriş mesnet noktalarından ve açıklık ortasından yanal olarak desteklendiği için Lb= 4m olarak belirlenir.

Mathinline
body--uriencoded--$$ \normalsize L_b = 4m \\ L_p = 1.76i_y \sqrt \frac%7BE%7D%7BF_y%7D = 1.76 \times 72.9 \times \sqrt \frac%7B200000%7D%7B355%7D = 3045.38mm < L_b = 4000mm \\ L_r = 1.95 i_%7Bts%7D \frac%7BE%7D%7B0.7F_y%7D \sqrt %7B \frac%7BJ_c%7D%7BW_%7Bex%7Dh_0%7D + \sqrt%7B \left ( \frac %7BJ_c%7D%7BW_%7Bex%7Dh_0%7D \right )%5e2+6.76 \left ( \frac %7B0.7F_y%7D%7BE%7D \right )%7D%7D = 9860mm \qquad i_%7Bts%7D =\frac%7Bb_f%7D%7B\sqrt %7B12 \left ( 1+ \frac%7B1%7D%7B6%7D \frac%7Bht_w%7D%7Bb_ft_f%7D \right)%7D%7D = 82.40mm $$