西藏典型单层混凝土砌块房屋打包带加固抗震试验研究

Seismic test research of typical single story masonry retrofitted with PP-band in Tibet

本文以振动台试验方式研究了打包带加固对西藏典型单层混凝土砌块房屋抗震性能的影响,同时考虑了结构平面布置、抗震设防及砌筑质量三个因素。选取3种西藏地区民居的经典户型制作了7个1∶3缩尺模型进行振动台试验,模型分别为3个无打包带加固模型、3个有打包带加固模型以及1个加固一半的模型。试验结果表明打包带加固墙体能明显提高墙体的整体性,减轻墙体震损;无打包带加固但砌筑质量好的单层民居抗震能力较好,基本满足当地9度设防的要求;高烈度下平面布置不规则的结构容易因扭转作用而发生破坏,圈梁、构造柱也在高烈度下发挥较大作用。打包带加固技术作为一种经济实用的加固技术可在西藏地区进行推广。

This paper studies seismic performance of masonry structures in Tibet which reinforced by polypropylene bands by shaking table test. At the same time, considering the structure layout, seismic fortification and laying quality three factors. Selected three classical houses in Tibet area to make seven 1/3 scaled models to shaking table test, including 3 models without PP-Band reinforcement of each apartment, 3 models reinforced by PP-Band and one half reinforced by PP-Band. The results showed that PP-Band reinforced wall can obviously improve the integri- ty of the wall to a certain extent and reduce the wall cracks. Buildings with high quality have better earthquake re- sistant ability, and basic meet the requirements of local 9 degrees fortification. Structure located in high intensity area is easy to damage because of torsion, as well as ring beam and constructional column play a large role in high intensity. As an economical and practical reinforcement technology, the strapping reinforcing technology can be popularized in Tibet area.