北京地区典型砖木结构农宅抗震加固性能研究
Earthquake resistant behavior on seismic strengthening of typical rural brick-wood structure in Beijing

根据北京地区农村住宅调研结果，选取最典型的砖木(前檐砖柱支撑)结构，进行了加固前后的振动台试验。针对北京地区农村住宅砖木结构(砖柱支撑)未加固模型的振动台试验结果，提出了抗震加固措施，包括：加设钢筋混凝土窗框，增大前纵墙的抗侧刚度；采用水泥砂浆面层加固两面山墙、砖柱和窗下墙，提高墙体的承载和变形能力；加设钢圈梁，提高结构的整体牢固性。分析了模型加固前后振动台试验的损伤情况、频率和阻尼、加速度动力系数、位移和滞回曲线等结构动力特性参数。上述加固措施显著提高了此类砖木结构农宅的抗震能力，加固模型达到了“小震不坏、中震可修、大震不倒”的抗震设防目标。
Comparision of resistant behavior was made between two kinds of seismic strengthening methods for the single-story brick-wood structure with brick columns representative of existing rural buildings in Beijing, through shaking table tests on large-scale models. According to the seismic damages of unreinforced model test, the seismic strengthening measures were proposed, which included: (1) addition of a concrete window frame to increase the lateral stiffness of front longitudinal wall, (2) strengthening the walls, brick columns and under-window walls by using cement mortar to increase the carrying and deformation capacity, (3) addition steel ring beam to enhance the robustness of the structure. The results of testing damage and the dynamic characteristics parameters, such as, dynamic frequency, structural damping, acceleration dynamic coefficient, hysteresis curve etc., showed that the reinforcement measures significantly increased the seismic resistance of this kind of brick-wood structure. At same time, the reinforcement measures could achieve the seismic design target of “operational under minor earthquakes, repairable damage under design basis earthquakes, and collapse prevention under rare earthquakes.”