- 摘 要
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(1 軍事科學(xué)院國防工程研究院， 北京 100036； 2 中國海洋大學(xué)工程學(xué)院， 青島 266100； 3 中國建筑科學(xué)研究院有限公司， 北京 100013)
［摘要］根據(jù)汶川地震中砌體結(jié)構(gòu)墻肢剪切裂縫分布情況，提出鋼筋-砂漿面層交叉條帶加固法，在砌體結(jié)構(gòu)承重墻上最容易產(chǎn)生剪切裂縫的破壞面上設(shè)置250～400mm寬鋼筋-砂漿面層加固條帶，由交叉布置的鋼筋-砂漿面層條帶承擔(dān)并分散墻體剪切應(yīng)力，避免或減緩強(qiáng)震下墻體出現(xiàn)交叉斜裂縫。通過系列的試驗(yàn)建立相應(yīng)的加固墻體抗剪承載力計(jì)算公式，并利用三維振動臺試驗(yàn)驗(yàn)證實(shí)際加固效果，解決設(shè)置圈梁、構(gòu)造柱約束砌體承載力偏低，及目前常用的砂漿面層加固法和板墻加固法加固后的墻體剛度比未加固墻體增大較多而產(chǎn)生結(jié)構(gòu)內(nèi)力重分布并導(dǎo)致新的薄弱部位出現(xiàn)等問題。試驗(yàn)研究表明，采用交叉條帶面層加固后，結(jié)構(gòu)具有較好的抗震能力，單片組合墻體的抗剪承載能力提高40%以上；加固后墻體有較好的變形能力和延性，縮尺模型位移延性系數(shù)平均值為4-0，單片墻試件位移延性系數(shù)有較大的提高，且破壞時縮尺模型的樓層層間位移角比未加固結(jié)構(gòu)明顯增大，墻體的破壞形態(tài)也由比較集中的X形交叉裂縫變?yōu)槎鄺l裂縫。
［關(guān)鍵詞］砌體結(jié)構(gòu)； 抗震加固； 鋼筋-砂漿面層交叉條帶法
中圖分類號：TU318文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)05-0001-08
Applicational study for seismic performance of existing masonry wall reinforced by steel bar-mortar crossed strip method
Zhou Xianxiang1, Xie Wei1, Jiang Jitong2, Yang Tao3, Chen Tao3, Chen Wei1
(1 Research Institute for National Defense Engineering of Military Sciences, Beijing 100036, China; 2 School of Engineering, Ocean University of China, Qingdao 266100, China; 3 China Academy of Building Research, Beijing 100013, China)
Abstract:According to the cracks distribution of masonry walls in Wenchuan earthquake, steel bar-mortar crossed strip method was put forward to reinforce existing masonry wall. 250～400mm wide steel bar-mortar crossed strip were constructed on the location where shearing cracks are most likely to happen on the load-bearing wall of the masonry structure, and the shear stress of the wall was undertaken and dispersed by steel bar-mortar crossed strip, avoiding or mitigating the cross cracks in the wall under strong earthquakes. Through a series of experiments, the corresponding formulas for calculating shear capacity of reinforced walls were established, and the actual effect of reinforcement was verified by a three-dimension shaking table test. Slove the problem of low bearing capacity of the existing masonry walls reinforced by setting ring beams and tie-columns, the common method using mortar layer and concrete splint will increase stiffness and redistribute obviously internal force of the reinforced walls, then new weak spots of the building may occur. The new method, with less stiffness increasing, may avoid these cases to happen. The experimental research shows that the structure has good seismic resistance after the reinforcement of steel bar-mortar crossed strip, and the shear bearing capacity of the single-piece composite wall is improved by more than 40%; the deformation capacity and ductility of the reinforced walls are better. And the average value of displacement ductility coefficient of the scale model is 4-0, and the displacement ductility coefficient of the single-wall test piece is greatly improved. When the failure occurs, the storey displacement angles of the scale model are obviously higher than the unreinforced structure, and the failure form of the wall is changed from concentrated X cross crack to several dispersed cracks.
Keywords:masonry structure; seismic reinforcement; steel bar-mortar crossed strip method
作者簡介：周獻(xiàn)祥，碩士，高級工程師，一級注冊結(jié)構(gòu)工程師， Email：zhouxianxiang1@163.com。
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