| The evaluation of the stability of ancient wooden-structure buildings in mountainous areas is an important issue for disaster prevention and mitigation of ancient buildings.Mountain topography has obvious amplification effect on earthquakes,which is very unfavorable for the protection of ancient wooden-structure buildings.Studying mountain topography on seismic response of ancient woodenstructure buildings has important practical guiding significance and application value.This article takes Wanshou Mountain in the Summer Palace and Foxiang Pavilion,the main building of Wanshou Mountain,as the research object,and uses the actual elevation data of Wanshou Mountain to establish the actual mountain model.On the basis of research on the seismic magnification of Wanshou Mountain,a more systematic study on the earthquake response of Foxiang Pavilion under the influence of mountain topography effect was further conducted.The research conclusions are as follows:1)Under the action of earthquake,the acceleration response of mountain surface acceleration mainly has the following three characteristics: First,under the action of earthquake,the maximum amplification factor may not always appear at the top of the mountain;Second,the altitude affects the amplification factor,the magnification factor has obvious elevation effect,and the acceleration magnification factor basically has a quadratic relationship with the altitude;the third is the relative height difference between the foot and the top affects the magnitude of the top-peak/foot-peak,the greater the relative height difference,the greater the top-peak/foot-peak;2)The modals of the main body of Foxiang Pavilion,the foundation and the overall modal of Foxiang Pavilion are calculated separately.Due to the influence of the foundation,the overall modal changes of the Foxiang Pavilion are determined.Mainly,the platform mode is added after the fourth-order vibration mode,and the platform has a greater influence on the superstructure;3)The dynamic time-history analysis of the Foxiang Pavilion under direct loading and considering the terrain effect respectively.The Foxiang Pavilion has the following three characteristics under the action of seismic waves: First,the response of each point on the top of the column under the earthquake is basically consistent,showing a good integrity;Second,the acceleration amplification effect is obvious when the terrain effect is considered,the amplification factor is between 2.2 and 2.4,which is nearly double the acceleration response when directly loaded;Third,when considering the terrain effect,the displacement angle between layers increases significantly,and the maximum value is close to the specification limit,and the terrain has a significant impact on the seismic effect of ancient buildings. |
