預(yù)制剪力墻結(jié)構(gòu)強(qiáng)水平縫弱豎縫結(jié)構(gòu)性能研究
本文選題:預(yù)制剪力墻 + 強(qiáng)水平縫弱豎縫; 參考:《華北理工大學(xué)》2017年碩士論文
【摘要】:隨著我國城市化進(jìn)程的不斷發(fā)展,城市住宅的需求數(shù)量和質(zhì)量與日俱增,與當(dāng)前我國廣泛應(yīng)用的現(xiàn)澆混凝土結(jié)構(gòu)相比,裝配式剪力墻結(jié)構(gòu)具有諸多顯著優(yōu)點(diǎn)。預(yù)制剪力墻結(jié)構(gòu)中存有各種形式的接縫,接縫的連接方式和特點(diǎn)關(guān)系到結(jié)構(gòu)的抗震性能和整體性。為解決預(yù)制剪力墻結(jié)構(gòu)中接縫的連接問題,使預(yù)制剪力墻結(jié)構(gòu)得到更多的推廣應(yīng)用,滿足剪力墻結(jié)構(gòu)設(shè)計的理念,提高結(jié)構(gòu)延性,提出“強(qiáng)水平縫弱豎縫”的設(shè)計理念,并利用新型預(yù)制-現(xiàn)澆組合鋼筋混凝土樓板的設(shè)計實現(xiàn)強(qiáng)水平縫,利用金屬阻尼器等耗能裝置實現(xiàn)弱豎向縫。采用一幢20層裝配式混凝土結(jié)構(gòu)模型,應(yīng)用有限元軟件SAP2000,分別建立現(xiàn)澆混凝土剪力墻結(jié)構(gòu)模型,設(shè)置豎向接縫的剪力墻模型,以及安裝不同參數(shù)的金屬阻尼器剪力墻模型。選取了五條地震波(El centro波,唐山-北京飯店南北向地震波,遷安波,蘭州波1,上海人工波5),分別對上述模型在八度設(shè)防烈度時多遇地震和罕遇地震情況下進(jìn)行時程分析,比較不同模型結(jié)構(gòu)的最大層間位移角。通過研究五組地震波的反應(yīng)分析可知,當(dāng)剪力墻豎向接縫寬度為300 mm~500 mm范圍時,在多遇地震和罕遇地震條件下,設(shè)置金屬阻尼器的預(yù)制剪力墻結(jié)構(gòu)能夠取得顯著的減震效果。多遇地震與罕遇地震情況下,通過比較各樓層的最大層間位移角,發(fā)現(xiàn)減震效率一般在20%~70%左右,這時減震效果較好。當(dāng)阻尼器初始剛度及屈服點(diǎn)取適當(dāng)較高的值時,有明顯的減震效果。位移型阻尼器在小震時基本處于彈性狀態(tài),為結(jié)構(gòu)提供剛度;在大震時則處于屈服狀態(tài),具備較好的耗能能力。在預(yù)制墻的豎向接縫內(nèi)設(shè)置金屬(軟鋼)阻尼器,可以減小在地震作用下結(jié)構(gòu)的層間位移角及具有耗能作用。因此,在預(yù)制墻的豎向接縫內(nèi)設(shè)置金屬阻尼器是可行的。
[Abstract]:With the development of urbanization in our country, the quantity and quality of urban housing are increasing day by day. Compared with the cast-in-place concrete structure widely used in our country, the prefabricated shear wall structure has many remarkable advantages. There are various kinds of joints in prefabricated shear wall structures. The connection mode and characteristics of the joints are related to the seismic performance and integrity of the structure. In order to solve the joint connection problem in precast shear wall structure, make the precast shear wall structure get more popularization and application, satisfy the design idea of shear wall structure, improve the ductility of the structure, put forward the design idea of "strong horizontal joint weak vertical joint". A new type of precast and cast-in-situ composite reinforced concrete floor slab is designed to realize the strong horizontal joint and the weak vertical joint is realized by the energy dissipation device such as metal damper. Using a 20-story assembled concrete structure model and finite element software SAP2000, the structural model of cast-in-place concrete shear wall, the shear wall model with vertical joint and the shear wall model of metal damper with different parameters are established respectively. Five seismic waves, El centro wave, Tangshan-Beijing Hotel seismic wave, Qian'an wave, Lanzhou wave 1 and Shanghai artificial wave 5, are selected. The time-history analysis of the above model is carried out under octave intensity frequent earthquakes and rare earthquakes, respectively. The maximum interstory displacement angle of different model structures is compared. The response analysis of five sets of seismic waves shows that when the width of vertical joint of shear wall is 300 mm~500 / mm, the prefabricated shear wall structure with metal damper can achieve remarkable seismic absorption effect under the condition of frequent earthquake and rare earthquake. In the case of frequent earthquakes and rare earthquakes, by comparing the maximum interstory displacement angles of each floor, it is found that the damping efficiency is generally about 20% or 70%, and the damping effect is better. When the initial stiffness and yield point of the damper are properly high, the damping effect is obvious. The displacement-type dampers are basically in the elastic state during small earthquakes, which provide stiffness for the structure, and are in the yield state for large earthquakes, so they have better energy dissipation capacity. A metal (mild steel) damper is installed in the vertical joint of the precast wall, which can reduce the interstory displacement angle and the energy dissipation of the structure under earthquake. Therefore, it is feasible to install a metal damper in the vertical joint of the precast wall.
【學(xué)位授予單位】:華北理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU973.16
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