北京农村单层四开间砖木住宅结构抗震加固研究  

Seismic behavior of a retrofitted one-story four-bay masonry residential building in rural area of Beijing

作　　者：赵作周[1] 许松健 陈俞[2] 刘辉[2] ZHAO Zuozhou;XU Songjian;CHEN Yu;LIU Hui(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China;Beijing Institute of Real Estate Science and Technology,Beijing 100021,China)

机构地区：[1]清华大学土木工程安全与耐久教育部重点实验室,北京100084 [2]北京市房地产科学技术研究所,北京100021

出　　处：《建筑结构学报》2018年第12期139-146,共8页Journal of Building Structures

基　　金：清华大学-北京市房地产科学技术研究所合作研究课题(清20142001336)

摘　　要：为了检验北京市既有单层大开间砌体砖木结构农宅的抗震加固效果,选取一座北京市既有典型单层四开间砌体砖木结构农宅作为研究对象,制作了1∶2缩比结构模型,模型按照北京市DB11/T 1199—2015《农村既有单层住宅建筑综合改造技术规程》的相关要求,采取增设钢门窗框、钢板圈梁、钢丝网水泥砂浆加固砖柱,以及在房屋四角砖墙、屋架间设置拉杆等抗震加固措施。对加固后结构模型进行了振动台试验,得到模型在不同水平地震波激励下的动力响应与损伤情况。试验研究结果表明：北京既有单层农宅在结构布置上存在沿纵向前后墙抗侧刚度差异大、木屋顶面内刚度小、结构整体性差、屋架抗倒塌能力弱等问题;随着山墙间距的增加,其抗倒塌能力愈弱;采用规程DB11/T 1199—2015建议的抗震加固方法能显著提高前纵墙抗侧刚度与前檐砖柱的变形能力、结构的整体性和屋架的抗地震倒塌能力。加固后结构整体达到“小震不坏、中震可修、大震不倒”的抗震设防目标。In order to verify the effectiveness of seismic retrofitof existing wood-masonry residential buildings in rural areas of Beijing, a dynamic test of a 1 ： 2 scaled retrofitted single-story four-bay wood-masonry structure model of typical existing rural residential buildings in Beijing was carried out. The structure was retrofitted following the Beijing design guideline DB11/T 1199--2015 ＇ Technical specification for comprehensive retrofitting of existing rural single- story residence buildings＇ , and the main retrofitting measures included adding steel doors and window frames, setting steel plate ring beams, strengthening masonry wall corners and columns with steel wire mesh-reinforced cement mortar and setting steel ties between the roof trusses to prevent their out of plane collapse. The dynamic response of the model under different seismic excitation levels was measured during the test. The test results show that the lateral stiffness difference between the front wall and the back longitude wall becomes greater with the distance between the two sidewalls and that the collapse-resisting capability becomes weaker under horizontal seismic action. Undertaking the retrofit measures presented in DB11/T 1199--2015 can significantly improve the lateral stiffness of the front walls and the structure integrity and the collapse-resisting capacity of the roof trusses as well. The retrofitted wood-masonry structure can satisfy the seismic design objectives of ＇ operational under the design minor seismic intensity, repairable damage intensity under the design seismic precautionary intensity, and collapse prevention under the design rare seismic

关 键 词：既有农村住宅 砖木结构 抗震加固 振动台试验 抗倒塌能力 

分 类 号：TU362[建筑科学—结构工程] TU366.2