and to control the lateral movement of the beams without fasteners fig1 b shows u2018 l shaped u2019 brackets 120 122 and 124 in a connector 100 u2032 which allow the beams to enter the top brackets 120 122 from the side as required for the top three beams of an arch assembled by cantilevering the bottom bracket in connector 100 u2032 is shown at 124 bolts screws or other fasteners are required to keep the beam in place in u2018 l shaped u2019 brackets fig1 c shows u2018 fully enclosed u2019 brackets 130 132 and 134 in a connector 100 u2033 which are used in applications where the ends of the stringer beams require protection from the weather e g with bamboo stringer beams the top brackets are shown at 130 and 132 and the bottom bracket is shown at 134 fig1 d shows u2018 wing u2019 type top brackets 140 and 142 in a connector 100 u2032 u2033 in this embodiment the bottom bracket is selected to be a u shaped bracket 144 fig1 e shows u2018 wing u2019 type top brackets 150 and 152 in a connector 100 u2033 u2033 configured without a transverse notch in this embodiment the bottom bracket in connector 100 u2033 is selected to be an l shaped bracket 154 the brackets in fig1 e are shown with holes 4 for bolts or other fasteners that are to be used to retain the beams in the brackets as shown in fig2 the purpose.