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作 者:杨纪芒 李翔[1] 唐文豪 YANG Jimang;LI Xiang;TANG Wenhao(Department of Structral Engineering,Tongji University,Shanghai 200092,China)
出 处:《结构工程师》2020年第3期151-159,共9页Structural Engineers
基 金:国家自然科学基金(51378376)资助项目。
摘 要:为了摸清混凝土多孔砖墙在地震中倒塌的机理,对两个带木楼板的半砖厚混凝土多孔砖墙模型进行了不同方向的振动台试验.在单向机械波的作用下,1/2比例的模型经历了弹性、开裂和倒塌三个阶段.砖墙顶部首先开裂,当最大加速度达到14.08 m/s^2时,平面外受力砖墙因墙底开裂而倒塌;平面内受力砖墙抗震性能相对较好,砖墙在加速度达到37.97 m/s^2时,墙底开裂,但砖墙仍能和木板一起受力直至振动结束.试验及分析证实,砖墙平面外受弯破坏是混凝土多孔砖墙倒塌的主要原因,研究应继续进行足尺模型试验以确保砌体结构房屋大震不倒.In order to understand the collapse mechanism of masonry walls subjected to the earthquake,unidirectional shaking table tests were done on two half-scaled models of brick-timber structures.The dynamic properties and responses of structures under different level of mechanical waves were recorded.Cracking patterns and collapse modes of perforated concrete brick walls were filmed by digital cameras.The interface between wooden floors and walls would crack firstly.Paired walls,which were vibrated perpendicular to their faces,would break and fall out-of-plane when max acceleration reached 14.08 m·s^-2.The performance of another model was better under the vibration along the length of the wall,the cracked walls could still rock with wooden floor when max acceleration came to 37.97 m·s^-2.It was found that out-of-plane failure of masonry structure was controlled by the flexural capacity of its bearing wall.Full-scaled test should to be carried out in further study.
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