Abstract:

In order to study the seismic response characteristics of tower frame foundation and optimize the seismic design, the tower frame foundation of a fractionation tower in a petrochemical plant was studied, the finite element simulation results of cylindrical tower foundation were compared with the calculation results using specification empirical formula, and the reasons for the deviation were analyzed. The tower frame foundation was calculated by bottom shear method, integrated model method and framework model method respectively, the results were compared, and the deviations of the results and the reasons were summarized. The results show that the simulation calculation of the cylindrical tower foundation did not take into account the actual influence of tower internals and pipelines, the simulation results of fundamental period T1 were larger, and the seismic effect at the tower bottom was smaller. Therefore, the method of increasing wall thickness can be used to adjust the simulation calculation. The interaction between tower and frame foundation was considered in the calculation of tower frame foundation by integrated model method. The fundamental period T1 was increased and the seismic force and total bending moment at the bottom of tower were reduced compared to the results of towers. The calculation results by bottom shear method deviated from those of integrated model method, so bottom shear method is not applicable. The seismic force and overturning moment calculated by framework model method were larger, resulting in excessive internal forces and reinforcement of the framework, so optimization and adjustment is advisable. The research results provide reference for the seismic design of tower frame foundations.

Key words:  ')">

 , tower frame foundation, seismic action, fundamental period, integrated model, framework model