损伤古砖塔的地震响应与破坏模式研究

打开文本图片集

中图分类号：TU365； TU371+ .1 文献标志码：A 文章编号：1000-0844（2025）05—1012—12

DOI：10.20000/j.1000-0844.20240118001

Abstract： The seismic response and failure modes of damaged ancient brick pagodas were investigated using a numerical model of Kaiyuan Temple Pagoda in Binxian County， Shaanxi Province. The model was established using the finite element software ABAQUS. Three seismic waves （ElCentro wave，Taft wave，and Lanzhou artificial wave） were input as ground motions. After four damage patterns were implanted， the seismic responses of the damaged pagoda under various damage conditions were calculated. The dynamic characteristics of the pagoda structure were analyzed，and acceleration amplification factors and story drift ratio curves along the structure height were obtained in all cases. Based on tensile damage and plastic strain distribution characteristics， seismic failure modes and the vulnerable locations of the Kaiyuan Temple Pagoda under different damage states were studied.Results indicate the following：（1） Under seismic action，the mortar layer exhibits initial cracking and failure，and damage subsequently propagates toward floor corners;（2） the second and seventh stories suffer the most severe damage and are thus identified as vulnerable layers；and （3） failure severity closely correlates with initial damage. The most severe damage occurs when the initial damage on the 4th floor is set at 30% ， followed by initial damage of 20% on the 4th/lst floor; the lightest damage occurs without any initial damage.

Keywords： masonry pagoda; finite element model; damage analysis; seismic response; dynamic characteristic

0 引言

砖石古塔体型高大、造型独特，是建筑遗产的典范，我国现存砖石古塔约2000座，其中超过700 年历史的古塔有200余座[1。（剩余14300字）