Effect of foundation stiffness on temperature analysis of a pedestrian bridge

Foundation stiffness is a critical factor in overlong structure temperature action analysis,which should be obtained by field measurement.According to the temperature action analysis of some overlong pedestrian bridge,the actual foundation stiffness can be calculated by the lateral and vertical load test of piles.Different internal force distributions of fixed supports,linear spring supports and nonlinear spring supports were compared.The results show that the fixed supports have brought excessive constrain to some high stiffness structural members,such as concrete core shear wall,and have changed the configurations of temperature internal forces,which are quite different from the actual conditions.The limitations of some assumptions about foundation stiffness were discussed.The specific suggestions on the proper value of foundation stiffness were given.