Preliminary remarks. Preliminary remarks. Preliminary remarks. CHAPTER 7 BM Analysis using Stiffness Method
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1 CHAPTER 7 BM Analysis using Stiffness Method Objectives เข าใจว ธ ของ stiffness method ก บ โครงสร างประเภทคาน Member & node identification In general each element must be free from load & have a prismatic cross section The nodes of each element are located at a support or at points where members are connected together or where the vertical or rotational disp at a point is to be determined Global & member coordinates The global coordinate system will be identified using x, y, z axes that generally have their origin at a node & are positioned so that the nodes at other points on the beam are +ve coordinates Global & member coordinates The global coordinate system will be identified using x, y, z axes that generally have their origin at a node & are positioned so that the nodes at other points on the beam are +ve coordinates The local or member x, y, z coordinates have their origin at the near end of each element The positive x axis is directed towards the far end
2 Kinematic indeterminacy The consider the effects of both bending & shear Each node on the beam can have degrees of freedom, vertical disp & rotation These disp will be identified by code numbers The lowest code numbers will be used to identify the unknown disp & the highest numbers are used to identify the known disp The beam is kinematically indeterminate to the 4 th degree There are 8 degrees of freedom for which code numbers to 4 rep the unknown disp & 5 to 8 rep the known disp evelopment of the stiffness method for beams follows a similar procedure as that for trusses Kinematic indeterminacy First we must establish the stiffness matrix for each element These matrices are combined to form the beam or structure stiffness matrix We can then proceed to determine the unknown disp at the nodes This will determine the reactions at the beam & the internal shear & moments at the nodes We will develop the stiffness matrix for a beam element or member having a constant cross-sectional area & referenced from the local x, y, z coordinate system y displacement A positive disp d Ny is imposed while other possible disp are prevented The resulting shear forces & bending moments that are created are shown Linear & angular disp associated with these loadings also follow the same sign convention We will impose each of these disp separately & then determine the loadings acting on the member caused by each disp
3 y displacement A positive disp d Ny is imposed while other possible disp are prevented The resulting shear forces & bending moments that are created are shown z rotation A positive rotation d Nz is imposed while other possible disp are prevented The required shear forces & bending moments necessary for the deformation are shown When d Nz is imposed, the resultant loadings are shown By superposition, the resulting four load-disp relations for the member can be expressed in matrix form as These eqn can be written as q kd Once all the member stiffness matrices have been found, we must assemble them into the structure stiffness matrix, K The rows & columns of each k matrix, the eqns are identified by the code numbers at the near end (N y, N z ) of the member followed by those at the far end (F y, F z ) When assembling the matrices, each element must be placed in the same location of the K matrix K will have an order that will be equal to the highest code number assigned to the beam Where several members are connected at a node, their member stiffness influence coefficients will have the same position in the K matrix & therefore must be algebraically added to determine the nodal stiffness influence coefficient for the structure
4 Application of the stiffness method for Once the stiffness matrix is determined, the loads at the nodes of the beam can be related to the disp using the structure stiffness eqn Q Partitioning the stiffness matrix into the known & unknown elements of load & disp, we have Application of the stiffness method for This expands into eqn: Q Q k u u u The unknown disp u are determined from the first of these eqn Using these values, the support reactions Q u are computed for the second eqn k k Application of the stiffness method for Intermediate loadings It is important that the elements of the beam be free of loading along its length This is necessary as the stiffness matrix for each element was developed for loadings applied only at its ends Consider the beam element of length L which is subjected to uniform distributed load, w Application of the stiffness method for Intermediate loadings First, we will apply FEM & reactions to the element which will be used in the stiffness method We will refer to these loadings as a column matrix q o The distributed loading within the beam is determined by adding these results
5 Application of the stiffness method for Member forces The shear & moment at the ends of each beam element can be determined by adding on any fixed end reactions q o if the element is subjected to an intermediate loading We have: q kd q 0 Example etermine the reactions at the supports of the beam as shown. is constant. Example cont d The beam has elements & nodes identified. The known load & disp matrices are: Example cont d We can now assemble these elements into the structure stiffness matrix. The matrices are partitioned as shown, Each of the member stiffness matrices can be determined.
6 Example cont d We can now assemble these elements into the structure stiffness matrix. The matrices are partitioned as shown, Example cont d จ บก นมาค ณ ส าหร บ 4 แถวแรก เราจะได แก สมการ 6.67, 6.67, Q 4 0 Q 0kN 5 6 5kN
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