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针对城镇既有砖砌体建筑抗震性能较差的问题,提出了一种适合多层砖砌体房屋的抗震加固新技术,即采用竖向无粘结预应力筋对砌体墙体进行加固,从而改善墙体的抗震性能,提高房屋的整体抗震能力。为了解该技术的加固效果,完成了两批共17片墙体构件的拟静力试验研究和一栋2层足尺房屋模型的拟动力试验研究。墙体构件的试验研究结果表明,该项加固技术可以大幅度提高砖砌体墙体的抗裂能力、受剪承载力和延性。房屋模型的拟动力试验研究则进一步表明,采用该项技术加固后,抗震设防烈度不足8度的房屋,在模拟9度罕遇地震的拟动力作用下基本保持弹性,抗震能力显著提高。在试验研究的基础上,提出了预应力加固砌体墙体的受剪承载力的计算方法。该技术在北京市怀柔区某多层办公建筑的实际应用情况表明,其具有施工工艺简单、工期短、成本低等优势。
Aiming at the poor seismic performance of the existing brick masonry buildings in urban area, a new seismic strengthening technology for multi-story brick masonry buildings is proposed, that is, the vertical unbonded prestressed tendons are used to reinforce the masonry wall, Thereby improving the seismic performance of the wall and improving the overall seismic capacity of the house. In order to understand the reinforcement effect of the technology, the quasi-static experimental study of two batches of 17 wall components and the pseudo-dynamic test of a two-storey full-scale house model have been completed. The test results of the wall members show that the reinforcement technology can greatly improve the crack resistance, shear capacity and ductility of brick masonry walls. The pseudo-dynamic experimental study of the house model further shows that the house with seismic fortification less than 8 degrees strengthened basically by the pseudo-motive force of 9 degree rare earthquakes and the anti-seismic capability is significantly improved. Based on the experimental research, the calculation method of the shear capacity of the prestressed reinforced masonry wall is proposed. The practical application of this technology in a multi-storey office building in Huairou District of Beijing shows that it has the advantages of simple construction process, short construction period and low cost.