【摘要】：超高層建筑結(jié)構(gòu)的剪力墻往往要承受極大的豎向荷載和地震作用,但傳統(tǒng)的鋼筋混凝土剪力墻承載力不高、變形能力小、延性差,在當(dāng)前情形下已難以滿足工程需求。雙層鋼板混凝土組合剪力墻因其具有承載力高、耗能能力強(qiáng)、延性好等優(yōu)點(diǎn),可以滿足超高層建筑中結(jié)構(gòu)構(gòu)件的高性能要求。目前國(guó)內(nèi)外雙層鋼板混凝土組合剪力墻震害實(shí)例基本沒有,試驗(yàn)研究的數(shù)量也不多。因此有必要來(lái)對(duì)雙層鋼板混凝土組合剪力墻的抗震性能進(jìn)行分析和探討。本文采用纖維截面模型疊加剪切彈簧考慮剪切效應(yīng),基于OpenSees程序,建立了雙層鋼板混凝土組合剪力墻在低周往復(fù)荷載作用下的有限元分析模型。利用試驗(yàn)結(jié)果論證了有限元分析模型的準(zhǔn)確性和可靠性。在此基礎(chǔ)上,分析混凝土強(qiáng)度等級(jí)、鋼板屈服強(qiáng)度、含鋼率、端柱與墻身鋼板比例等關(guān)鍵因素對(duì)組合墻抗震性能的影響。在分析數(shù)據(jù)的基礎(chǔ)上,給出了雙層鋼板混凝土組合剪力墻構(gòu)造設(shè)計(jì)建議和抗剪承載力計(jì)算公式。本文研究的主要結(jié)論如下:1.隨著混凝土強(qiáng)度等級(jí)的提高,組合墻抗側(cè)剛度和極限承載力提升明顯。在約束拉桿、鋼板、端柱鋼管等合理布置的前提下,高強(qiáng)混凝土與鋼板共同工作且耗能能力和延性良好,可以極好地發(fā)揮其高強(qiáng)度。2.隨著鋼板屈服強(qiáng)度的提升,鋼板屈服強(qiáng)度和極限承載力呈現(xiàn)線性增長(zhǎng),達(dá)到極限承載力之后,剛度退化幾乎相同。3.組合墻截面含鋼率的提高直接導(dǎo)致鋼板厚度增加,而鋼板厚度變大能直接提高鋼板提供的剪力貢獻(xiàn)值。同時(shí)鋼板對(duì)混凝土約束作用也在一定程度上提升,從而混凝土抗剪承載力隨之提高。含鋼率由8.8%增大到12.4%時(shí),含鋼率與極限承載力幾乎成線性增長(zhǎng),含鋼率超過12.4%后,承載力增長(zhǎng)明顯放緩。4.端柱和墻身鋼板比例tz/tw對(duì)組合墻耗能能力、極限承載力和延性均有一定的影響,在其他條件相同情況下,tz/tw為2.0時(shí)組合墻的抗震性能表現(xiàn)最佳。5.通過有限元計(jì)算數(shù)據(jù)的回歸分析,在已有公式的基礎(chǔ)上修正了鋼板項(xiàng)和混凝土項(xiàng)系數(shù),提出了雙層鋼板混凝土組合剪力墻抗剪承載力計(jì)算公式。
[Abstract]:The shear wall of super high-rise building structure is often subjected to great vertical load and seismic action, but the traditional reinforced concrete shear wall has low bearing capacity, small deformation capacity and poor plasticity, so it is difficult to meet the engineering needs under the current situation. Double-deck steel plate concrete composite shear wall can meet the high performance requirements of structural members in super high-rise buildings because of its high bearing capacity, strong energy consumption capacity, good ductility and so on. At present, there are no earthquake damage examples of double-layer steel plate concrete composite shear wall at home and abroad, and the number of experimental research is not many. Therefore, it is necessary to analyze and discuss the seismic performance of double-layer steel plate concrete composite shear wall. In this paper, the fiber section model superimposed shear spring is used to consider the shear effect. Based on OpenSees program, the finite element analysis model of double-layer steel plate concrete composite shear wall under low cyclic reciprocating load is established. The accuracy and reliability of the finite element analysis model are demonstrated by the test results. On this basis, the influence of key factors, such as concrete strength grade, steel plate yield strength, steel content and the ratio of end column to wall body steel plate, on the seismic performance of composite wall is analyzed. Based on the analysis of the data, the structural design suggestions and the calculation formula of shear capacity of double-layer steel plate concrete composite shear wall are given. The main conclusions of this paper are as follows: 1. With the improvement of concrete strength grade, the lateral stiffness and ultimate bearing capacity of composite walls are improved obviously. Under the premise of reasonable arrangement of restrained pull rod, steel plate, end column steel pipe and so on, high strength concrete and steel plate work together and have good energy dissipation capacity and toughness, so they can give full play to their high strength. 2. With the increase of yield strength of steel plate, the yield strength and ultimate bearing capacity of steel plate increase linearly, and after reaching the ultimate bearing capacity, the stiffness degradation is almost the same. 3. The increase of steel content of composite wall section directly leads to the increase of steel plate thickness, and the increase of steel plate thickness can directly increase the shear contribution value provided by steel plate. At the same time, the restraint effect of steel plate on concrete is also improved to a certain extent, so the shear capacity of concrete is improved. When the steel content increases from 8.8% to 12.4%, the steel content and ultimate bearing capacity increase almost linearly. When the steel content exceeds 12.4%, the increase of bearing capacity slows down obviously. The ratio of end column to wall body steel plate tz/tw has certain influence on the energy dissipation capacity, ultimate bearing capacity and toughness of the composite wall. Under the same other conditions, the seismic performance of the composite wall is the best when tz/tw is 2.0. 5. Based on the regression analysis of finite element calculation data, the steel plate term and concrete term coefficient are modified on the basis of the existing formulas, and the formula for calculating the shear capacity of double-layer steel plate concrete composite shear wall is put forward.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.9;TU352.11

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本文編號(hào)：2484979