已知公差不为零的等差数列\(\{a _{n} \}\)的前\(n\)项和为\(S _{n}\)，满足\(a _{2} +S _{5} =28\)，且\(a _{1}\)，\(a _{3}\)，\(a _{13}\)成等比数列．
\((\)Ⅰ\()\)求数列\(\{a _{n} \}\)的通项公式；
\((\)Ⅱ\()\)设数列\(\{b _{n} \}\)满足\(b_{n}= \dfrac {1}{a_{n}a_{n+1}}\)，求数列\(\{b _{n} \}\)的前\(n\)项和\(T _{n}\)．