884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 北京市建筑設(shè)計(jì)研究院有限公司，  北京 100045； 2 土木工程安全與耐久教育部重點(diǎn)試驗(yàn)室， 清華大學(xué)， 北京 100084）

［摘要］北京市有一批建于20世紀(jì)70年代的高層低配筋混凝土剪力墻住宅。由于修建時(shí)間較早，受到當(dāng)時(shí)經(jīng)濟(jì)條件和規(guī)范水平的影響，結(jié)構(gòu)混凝土強(qiáng)度低且配筋率嚴(yán)重不足，為了滿足現(xiàn)行抗震規(guī)范對(duì)混凝土結(jié)構(gòu)抗震的要求，需要進(jìn)行抗震加固。為了盡可能縮短加固工程周期并減少對(duì)居民生活的影響，提出了外套式加固方法，該方法無需進(jìn)入原結(jié)構(gòu)內(nèi)部，僅在原結(jié)構(gòu)兩側(cè)延長橫墻長度、增設(shè)縱墻，并在原結(jié)構(gòu)頂部增設(shè)跨越屋面的大梁將兩側(cè)的加固部分連成整體。為了考察加固后結(jié)構(gòu)的抗震性能，采用子結(jié)構(gòu)技術(shù)進(jìn)行1∶2縮比模型擬靜力試驗(yàn)。試驗(yàn)結(jié)果表明：原結(jié)構(gòu)經(jīng)加固后承載力大幅提高；加固結(jié)構(gòu)在層間位移角達(dá)到1/200時(shí)，承載力達(dá)到峰值；層間位移角達(dá)到1/100時(shí)，結(jié)構(gòu)連梁剪壞，剪力墻墻角混凝土壓碎，結(jié)構(gòu)剩余承載力約為峰值承載力的85%；加固后結(jié)構(gòu)承載力和延性滿足現(xiàn)行抗震規(guī)范要求。

［關(guān)鍵詞］魚骨式剪力墻； 低配筋； 外套式加固； 擬靜力試驗(yàn)

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)18-0088-05

Experimental study of reinforced concrete shear wall structure with low reinforcement ratio retrofitted by exterior strengthening method

Su Yukun1, Li Wenfeng1, Miao Qisong1, Pan Peng2

(1 Beijing  Institute of Architectural Design, Beijing 100045, China; 2 Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Tsinghua University, Beijing 100084, China)

Abstract:A group of low reinforcement ratio concrete shear wall buildings which were constructed during 1970s are still used of Beijing. As the buildings were built pretty early, according to the economic conditions and standards, their concrete strength is too low, and the steel reinforcement in the concrete wall is inadequate. In order to satisfy current seismic design standard for reinforced concrete structures, the buildings need to be retrofitted. To shorten the construct period and minimize the disturbance to the residents, a retrofit method that is constructed from outside were proposed. This method only need to extend the length of the transverse wall, add the vertical wall and use concrete beam across the roof to connect the reinforcement part of both sides without enter the original structure. In order to study the seismic performance of the retrofitted structures, a structure model with a scale ratio of 1∶2 was tested by using substructure method. The test results show that the strength of the structure  significantly increases after retrofitted. The strength of the structure reaches the peak value when the top displacement reaches 1/200 of the structure height. When the top displacement reaches 1/100 of the structure height,the major damage of the structure is observed at the coupling beams and the bottom of the shear wall. The residual strength is about 85% of the peak value. Strength and ductility of the retrofitted structure satisfy the current seismic design standard.

Keywords:fishbone type shear wall; low reinforcement; exterior strengthening; quasi static test

 作者簡介：蘇宇坤，碩士，Email：syk2182857@126.com。