부산대학교 도서관

Different site classifications and pile-soil-structure interaction (PSSI) would have significant influence on the seismic dynamic response of lattice communication tower (SDRLCT), the relevant studies on which are quite limited so far. A three-dimensional finite element model on the basis of a typical 50m high lattice communication tower (LCT), considering PSSI, was developed in this paper to study this scientific issue. The dynamic analysis was conducted with respect to site conditions: class I to IV. The maximum horizontal displacements (MHD) between top and bottom and the maximum acceleration (MA) at the top of tower were taken as dynamic response indexes. The results were compared with that of the analysis of rigid foundation tower (RFT) without considering PSSI effect. It was found that the performances of SDRLCT, such as displacement ratio and main material axial force, varied under different site conditions, to be specific, soil getting softer, the dynamic response is more strong. In addition, under the condition of site class I, PSSI had no apparent effects on the results, while significant effects in terms of site class II, III and IV. Furthermore, the position of weak points of LCT, with respect to different site condition, remained at the place where the structural form of diagonal bracing changed. As a result, the PSSI effects should be involved in the engineering design, and the weak points should be strengthened. The results would provide valuable theoretical basis and reference to practical engineering design.