| 摘要 |
PROBLEM TO BE SOLVED: To provide an earthquake resistant design arithmetic unit for a structure and an earthquake resistant design method for the structure, which can facilitate design operation and reduce the design cost. SOLUTION: A structure model is structured by modeling an elevated bridge structure and its structure conditions are set as data; and ground conditions and various member section elements are set as data and stored in a data area. A dynamic nonlinear analysis of the structure model is taken to confirm predominance of vibration in primary mode during an L2 earthquake and a plastic hinge generation place of the structure model, and the bar arrangement of stakes of the elevated bridge structure is reviewed. A static nonlinear analysis is taken by using data which are stored in a data area so far to calculate the horizontal displacement quantity of the top position of the structure model and after the yield displacement quantityδy and yield seismic coefficient Khy of the elevated bridge structure are extracted, an equivalent natural cycle Teq is calculated. This is plotted to a necessary yield seismic intensity spectrum to read a response plasticity rateμand calculate response displacement.
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