Truss Design Project Essay -- Engineering

SummaryWe have objected a constipate to support a orient load, placed at 190mm from the edge of a 450mm gap. The vertical face of the tie d professes is modelled on the already established K constipate design, but the overall shape of the structure is our own. There atomic number 18 trey K units on each truss. The two vertical faces ar held in concert at the top by a nonher truss-like design. We modelled this on the N truss.The truss is constructed from hot-dog sticks, glue and bolts.IntroductionThe task was to construct a truss start of 48 hot-dog sticks and 30 bolts to support as large a mention load as possible. It was to span a gap of 450mm and to support a load placed at 190mm from the end. The truss may have a utmost depth beneath the supports of 130mm, and the loading rod placed not more than 110mm beneath the supports. Member ends must be bolted and the forces within the members calculable. spew ObjectivesMaximise the load capacity of the trussAchieve an even dis persal of force to each memberConstruct the truss carefully for maximum qualityDesign a truss which did not fail from flexural-torsional buckling. ontogeny of the ModelWe began by researching established truss designs, such as the Bailey bridge over, Baltimore bridge and the N truss. We realised that although each type of truss was useful for its own purpose, none of the bridges was intended for supporting a point load. However, we compared the designs by calculating the distribution of forces in the members. This gave some guidance to the development of the model.We researched the K truss, which is composed of many repeated K units, in either direction. This design gives the most even distribution of force to the members, which satisfies o... ... to the members reinforcing material glued to contraction members holes drilled towards the middle of tension members to give extra support the go shape of the top and bottom of the trusses for improved weight distribution and the N tr uss design on the top and bottom to prevent flexural-torsional buckling.Drawings are over the pageConclusionsThe K-truss is the most effective means of distributing a point load amongst members, under determinate conditions.Increasing the concavity/ angle of the outmost members of the truss lessens the forces in the members.Reversing the direction of the Ks at the ready of the point load helps to lessen the force in the corresponding vertical members.It is desirable to have as many Ks in the truss as possible. The solution is maximised so that all 30 bolts are used, giving a good amount of K joints.