古砖塔内植锚杆加固前后抗倒塌能力研究

Study on the Seismic Collapse Resistance Ability of Ancient Brick Pagoda Unretrofitted and Retrofitted with Interplantation Anchor Technology

古砖塔作为古代高层建筑的杰出代表,是中国古代建筑中最为宝贵的一笔文化遗产。长年的风雨侵蚀和人为的损坏,古砖塔的稳定性和承载力也大大降低,在地震时会发生严重的破坏,因此,开展砖石古塔的保护研究,对古建筑的保护具有重大的现实意义。本文通过应用单元法,对地震作用下古砖塔加固前后的抗震性能进行了仿真模拟,重点研究建筑内植锚杆加固技术对古砖塔抗倒塌能力的影响。发现在地震作用下,未加固的古砖塔倒塌过程基本与汶川地震中古砖塔的倒塌情况类似。从上部楼层的墙体相对变形较大,部分墙体抗剪强度不足脱落开始,随着变形的继续增大,上部多层出现倒塌。采用建筑内植锚杆技术加固后,加强了砖墙的约束,提高了墙体的抗剪、抗拉强度,以及抗变形能力,在墙体发生破坏时,加固后的墙体由于內植锚杆的存在,使得结构的层间刚度下降很小,越向上的楼层,这种作用越明显,使得在整个地震作用过程中未出现倒塌破坏。

The ancient brick pagoda as an outstanding representative of ancient high-rise buildings,is a valuable cultural heritage of the most ancient buildings in China. Years of wind and rain erosion and man-made damage,the stability and the bearing capacity of the ancient brick pagoda are greatly reduced,the severe damage would be occurred in the earthquake,so to carry out the research on the protection of the ancient brick pagoda has great practical significance for the protection of ancient buildings. By using the applied element method,the seismic performance of the unretrofitted and retrofitted ancient brick pagoda under earthquake is simulated,focusing on the influence of the seismic collapse resistance of ancient brick pagoda with the interplantation anchor technology. It is found that,under the earthquake,the collapse process of unretrofitted ancient brick pagoda is similar to the basic situation of pagoda collapsed in the Wenchuan earthquake. The wall of the upper floors is relatively large deformation,the shear strength of the wall is not enough to begin to fall off,as the deformation continues to increase,the upper layers is collapsed. After the reinforcement of the brick wall with the interplantation anchor technology,the shear strength,tensile strength,and the ability to resist deformation of the wall are improved. When the failure occurs in the wall,reinforced wall due to implant anchor,the structure layer stiffness decline is very small,and this effect is more obvious in the higher floor,so the collapse of the damage does not appear in the earthquake process.