analysis and design of three span suspension bridge using midas civil

Main Cable Group: Select the Element Group to which the main cables of a suspension bridge are assigned. Using an initial configuration analysis, determine the equilibrium state which exhibits the horizontal cable forces inputted by the user. Therefore, one Sag Point node (2 nodes for a 3-D bridge) must be assigned to a group. Since the sag value of the main cables at the center of the center span is defined by the user, these nodes must be excluded from being updated. However, the node at the sag point is included in the group although it is not updated. Nodes at each end of a cable, which are affixed to supports, are excluded.

Accordingly, it is recommended to group all the cable nodes. The nodes for the cable elements of a suspension bridge are continuously updated in the process of optimizing the equilibrium state.

Select the node group whose coordinates will be updated. When Initial Force is selected Node Group to be Updated Initial Force : Determine an initial configuration of a suspension bridge model by updating initial forces Optimal Approach : Determine an initial configuration of a suspension bridge model by updating design parameters satisfying the specified constraint condition. Number of Iteration: Enter the number of iterations for nonlinear analysis.Ĭonvergence Tolerance: Enter the convergence tolerance, which will be used for acceptance of errors. This process is required for a self-anchored suspension bridge, as the coordinates of the entire cable system are changed by the axial displacement occurring in the girder.įrom the Main Menu select Analysis > Analysis Control > S uspension Bridge. In order to perform an initial configuration analysis considering the global system of a bridge, re-analysis using this function is needed. Suspension Bridge Wizard performs an initial configuration analysis only considering the cable system. The suspension bridge model created from Suspension Bridge Wizard is modified to suit the user intention and analyzed once again to determine an accurate initial configuration. Suspension Bridge Analysis Control Suspension Bridge Analysis Control

Analysis and design of three span suspension bridge using midas civil