發(fā)布時間：2018-11-14 19:51

【摘要】：砌體結(jié)構(gòu)是一種歷史悠久的結(jié)構(gòu)形式,歷次震害表明,無筋砌體結(jié)構(gòu)震害嚴重,為了提高其抗震性能,在砌體中配置一定量的鋼筋形成配筋砌體成為我國在地震區(qū)采用砌體結(jié)構(gòu)的必然選擇。配筋砌體能提高其抗震性能的關(guān)鍵是鋼筋與砌體之間的粘結(jié)力。砌體結(jié)構(gòu)中鋼筋的粘結(jié)強度不僅與砂漿強度有關(guān),還與砌體所受的豎向壓應力相關(guān)。因此,本文以配筋磚砌體為研究對象,通過試驗及理論分析,旨在探究配筋砌體受豎向壓應狀態(tài)下配筋的粘結(jié)性能。主要研究內(nèi)容與結(jié)論如下:本文根據(jù)實際配筋砌體中水平鋼筋的受力特點,自制試驗裝置,模擬了結(jié)構(gòu)構(gòu)件在施工及使用過程中,不斷受到自重及上部荷載的壓縮作用。制作了20組試件,考慮了豎向壓應力與粘結(jié)錨固長度等因素,通過拉拔試驗,獲得了試件樣本的破壞形式和粘結(jié)滑移曲線規(guī)律,通過對粘結(jié)滑移曲線特征及影響參數(shù)的分析,提出了考慮豎向壓應力影響的配筋磚砌體粘結(jié)滑移本構(gòu)模型,建立了粘結(jié)滑移數(shù)學表達式,給出了含豎向壓應力與粘結(jié)錨固長度兩個變量的粘結(jié)滑移特征參數(shù)方程,并對結(jié)果進行了對比分析,結(jié)論表明,預測結(jié)果與試驗結(jié)果吻合良好。通過對配筋外貼應變片,得到了配筋磚砌體在長粘結(jié)錨固下配筋沿長度方向應變分布規(guī)律,采用應變求解粘結(jié)應力的矩陣方程法,獲得了配筋沿長度方向的應力分布并給出了能反應粘結(jié)應力分布的解析函數(shù)。
[Abstract]:Masonry structure is a kind of structure form with a long history. The previous earthquake damage shows that the seismic damage of unreinforced masonry structure is serious, in order to improve its seismic performance, Reinforcement masonry with a certain amount of reinforcement in masonry has become the inevitable choice of masonry structure in earthquake area in China. The key to improve the seismic performance of reinforced masonry is the bond between reinforcement and masonry. The bond strength of reinforcing bar in masonry structure is not only related to mortar strength, but also to the vertical compressive stress of masonry. Therefore, this paper takes reinforced brick masonry as the research object, through experimental and theoretical analysis, the purpose of this paper is to explore the bond behavior of reinforced masonry under vertical compression. The main research contents and conclusions are as follows: according to the stress characteristics of horizontal steel bars in practical reinforced masonry, this paper simulates the compression action of structural members subjected to self-weight and upper load during construction and use. Twenty groups of specimens were made. The vertical compressive stress and the length of bond anchoring were taken into account. Through drawing test, the failure form and the law of bond-slip curve were obtained, and the characteristics of bond-slip curve and the influence parameters were analyzed. The bond-slip constitutive model of reinforced brick masonry considering the effect of vertical compressive stress is proposed. The mathematical expression of bond-slip is established, and the characteristic parameter equation of bond-slip with two variables of vertical compressive stress and bond anchoring length is given. The results are compared and analyzed. The conclusion shows that the predicted results are in good agreement with the experimental results. The strain distribution of reinforced brick masonry along the length direction under long bond Anchorage is obtained by attaching strain gauges to the outside of reinforcement. The matrix equation method of strain solution to bond stress is adopted. The stress distribution along the length of the reinforcement is obtained and the analytical function of the stress distribution can reflect the bond stress distribution is given.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU364

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本文編號：2332132