Seismic response analysis and lap length study of simply supported beam bridge across faults
To study the seismic response and lap length requirements of the simply-supported bridge across faults,an elastic-plastic analysis model of the simply-supported bridge was established.Through dynamic response analysis,elastic-plastic analysis and shear resistance analysis,the influence of slip effect of fault ground motion on the lap length requirement of simple supported beam bridge is studied,and the relation between the relative displacement of pier beam and the permanent displacement of ground before plastic hinge failure is discussed.Research shows that the location of the fault affected the seismic response of the structure,and the closer the fault structure is,the greater the earthquake impact will be.The slip impact effect of fault ground motion increased the seismic response of the structure.The maximum shear strength ratio of the plastic joint area of the pier under fault earthquake action is 0.47.The checking calculation of the shear strength of the pier meets the requirements of the seismic design code.The seismic response of the structure under cross-fault seismic action drifted,resulting in the plastic hinge only developing in the same direction.The residual sum of squares and R2 of the polynomial fit are 539.910 and 0.984,respectively.When the permanent displacement of ground is 1.6 m,the relative displacement of pier and beam before plastic hinge failure is 49.5 cm,accounting for about 56%of the calculated supported length.When the peak acceleration is small,the supported length of the simply-supported beam bridge under the earthquake action across the fault meets the requirements of the code.
万方数据
维普
