【摘要】：近年來,我國高層建筑發(fā)展迅速,各種高層、超高層建筑不斷涌現(xiàn)。內(nèi)置鋼板-混凝土組合剪力墻因其具有承載力高、延性好、耗能能力強等優(yōu)點,滿足高層建筑對結(jié)構(gòu)構(gòu)件強度、剛度等性能的高要求。高強混凝土的采用具有節(jié)材、可有效減小結(jié)構(gòu)構(gòu)件的截面尺寸,增加建筑的使用空間等優(yōu)點,將成為高層建筑領(lǐng)域的優(yōu)選材料。將高強混凝土應用于內(nèi)置鋼板-混凝土組合剪力墻,能夠充分發(fā)揮鋼、混凝土組合的優(yōu)勢,可提高剪力墻的承載力、減小剪力墻截面面積并具有較大的抗側(cè)剛度,提高建筑結(jié)構(gòu)綜合抗震性能,具有廣泛的應用前景。但因缺乏高強混凝土應用于內(nèi)置鋼板-混凝土組合剪力墻的研究成果和工程實踐經(jīng)驗,使得對高強混凝土的認識和理解不同,限制了高強混凝土的應用。本文采用試驗研究與理論分析相結(jié)合的方法,對配置混凝土強度等級為C80的內(nèi)置鋼板-混凝土組合剪力墻試件在往復荷載作用下的滯回性能進行分析,研究其承載能力、剛度、延性、耗能能力和破壞特征。根據(jù)試驗研究及分析結(jié)果,提出內(nèi)置鋼板-混凝土組合剪力墻設(shè)計建議。論文具體完成了以下內(nèi)容:(1)共完成了30個剪力墻試件試驗研究,其中包括20個剪跨比為1的試件和10個剪跨比為2的試件。系統(tǒng)分析了軸壓比、墻身鋼板含鋼率、墻身分布鋼筋配筋率及間距等對試件的承載力、剛度、變形能力、滯回耗能能力及破壞特征的影響。研究結(jié)果表明:內(nèi)置鋼板能有效提高剪力墻的抗側(cè)剛度、承載力和耗能能力;內(nèi)置鋼板-剪力墻的設(shè)計軸壓比限值可取為0.50;在保證一定構(gòu)造措施下,C80高強混凝土在試件中能夠充分發(fā)揮其強度,并不影響試件所需的變形能力。(2)采用基于修正斜壓場理論的VT2程序進行內(nèi)置鋼板-混凝土組合剪力墻的非線性有限元分析,從應力-應變層次出發(fā),對這種試件在模擬地震作用的低周反復加載試驗條件下的受力機制和受力全過程進行了更為深入的模擬分析,并與試驗結(jié)果進行對比。從每個試件的對比結(jié)果看,VT2計算得到的荷載-位移曲線與試驗滯回曲線吻合度較高,鋼筋混凝土有限元單元受壓及受拉破壞位置、形態(tài)、裂縫走向均與試驗結(jié)果近似,具有較高的準確性。(3)通過分析內(nèi)置鋼板對剪力墻受剪承載能力的貢獻,在現(xiàn)行規(guī)范已有公式的基礎(chǔ)上修正型鋼及鋼板項系數(shù),給出內(nèi)置鋼板-組合剪力墻受剪承載力計算公式,該公式能夠更好的反應墻體鋼板含鋼率對承載力的影響。通過試驗數(shù)據(jù)分析,確定平截面假定仍適用于配置C80高強混凝土的內(nèi)置鋼板-混凝土組合剪力墻受彎承載力計算。
[Abstract]:In recent years, high-rise buildings in our country have developed rapidly, and various high-rise and super-high-rise buildings have been emerging. Because of its advantages of high bearing capacity, good ductility and strong energy dissipation capacity, the built-in steel plate-concrete composite shear wall can meet the high requirements for the strength and stiffness of structural members in high-rise buildings. The use of high-strength concrete has the advantages of saving materials, effectively reducing the cross-section size of structural members and increasing the use space of buildings, which will become the best material in the field of high-rise buildings. The application of high strength concrete in steel plate concrete composite shear wall can give full play to the advantages of steel and concrete combination, can improve the bearing capacity of shear wall, reduce the cross section area of shear wall and have greater lateral stiffness. Improving the comprehensive seismic performance of building structure has a wide application prospect. However, due to the lack of research results and engineering experience in the application of high strength concrete to the composite shear wall of steel plate and concrete, the understanding and understanding of high strength concrete are different, which limits the application of high strength concrete. In this paper, the hysteretic behavior of steel plate concrete composite shear wall with concrete strength grade C80 under reciprocating load is analyzed by means of experimental study and theoretical analysis, and its bearing capacity and stiffness are studied. Ductility, energy dissipation and damage characteristics. According to the experimental research and analysis results, the design suggestion of composite shear wall with steel plate and concrete is put forward. The main contents are as follows: (1) A total of 30 shear wall specimens were studied, including 20 specimens with shear span ratio of 1 and 10 specimens with shear span ratio of 2. The effects of axial compression ratio, steel content of wall steel plate, reinforcement ratio and spacing on the bearing capacity, stiffness, deformation capacity, hysteretic energy dissipation capacity and failure characteristics of the specimens are systematically analyzed. The results show that the internal steel plate can effectively improve the lateral stiffness, bearing capacity and energy dissipation capacity of the shear wall, and the limit value of the design axial compression ratio of the built-in steel plate and shear wall should be 0.50; Under certain structural measures, C80 high strength concrete can give full play to its strength in the specimen. (2) the VT2 program based on modified baroclinic field theory is used to analyze the nonlinear finite element analysis of steel plate concrete composite shear wall, starting from the stress-strain level. In this paper, the mechanical mechanism and the whole process of this specimen under the condition of low cycle repeated loading to simulate earthquake action are analyzed more deeply and compared with the experimental results. From the comparison results of each specimen, it is found that the load-displacement curve calculated by VT2 is in good agreement with the hysteresis curve of the test, and the location of compressive and tensile failure, the shape and the direction of crack of the finite element of reinforced concrete are similar to the experimental results. (3) by analyzing the contribution of the built-in steel plate to the shear bearing capacity of shear wall, the coefficients of section steel and steel plate are modified on the basis of the existing formulas of the existing code. A formula for calculating the shear capacity of steel plate composite shear wall is presented. The formula can better reflect the influence of steel content on the bearing capacity of the wall steel plate. Through the analysis of test data, it is determined that the assumption of plane section is still applicable to the calculation of flexural bearing capacity of steel plate concrete composite shear wall with C80 high strength concrete.
【學位授予單位】：中國建筑科學研究院
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TU973.16;TU973.31
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本文編號：2398444