隔震建筑抗超大震性能分析與設(shè)計
發(fā)布時間：2019-01-26 18:35
【摘要】：隔震技術(shù)是50年來結(jié)構(gòu)抗震領(lǐng)域突出的研究成果。近年來,高層建筑結(jié)構(gòu)成為未來的發(fā)展趨勢,高層隔震技術(shù)也在我國得到廣泛的應(yīng)用。近幾年國內(nèi)發(fā)生過數(shù)起9度以上的特大地震,而隔震建筑的實際設(shè)防烈度通常小于9度,在設(shè)計基準期內(nèi)可能承受超出設(shè)計1度左右的地震作用,即超大震作用。隔震措施可以使上部結(jié)構(gòu)在大震作用下處于彈性或弱非線性狀態(tài),減小上部結(jié)構(gòu)的地震響應(yīng),然而在大震、特別在超大震作用下隔震層位移、結(jié)構(gòu)整體的抗傾覆安全都需要特別研究。本文通過SAP2000和ETABS軟件建立隔震結(jié)構(gòu)有限元模型并進行動力彈塑性時程分析,重點研究基于“大震不倒”設(shè)計的隔震結(jié)構(gòu)的抗超大震性能、實現(xiàn)抗超大震的代價和對應(yīng)設(shè)計方法,主要完成以下內(nèi)容:(1)按8度設(shè)防分別設(shè)計高度為27m、53m和95m的隔震結(jié)構(gòu),通過SAP2000和ETABS軟件對這三個隔震結(jié)構(gòu)進行建模,采用彈塑性時程分析對結(jié)構(gòu)在地震峰值加速度(PGA)為70gal、220gal、310gal、400gal、510gal、620gal等地震下的動力響應(yīng)進行計算;通過比較三個結(jié)構(gòu)的層間位移角、隔震支座位移及結(jié)構(gòu)傾覆力矩等響應(yīng),判斷結(jié)構(gòu)在超大震下是否倒塌、倒塌模式及臨界PGA,得到隔震結(jié)構(gòu)的抗超大震能力。(2)通過提高設(shè)計安全系數(shù)的方式增加結(jié)構(gòu)的抗超大震能力。為提高隔震結(jié)構(gòu)的抗超大震能力并同時保證不額外付出過大代價,對前文所選結(jié)構(gòu)隔震層進行改進設(shè)計,在不改變支座個數(shù)及支座布置的基礎(chǔ)上,通過擴大支座截面的方式保證隔震結(jié)構(gòu)能夠承受超大震的作用,并對改進后的結(jié)構(gòu)層間位移角、隔震支座位移、結(jié)構(gòu)傾覆力矩進行分析,得到超大震下新的結(jié)構(gòu)的破壞模式和臨界PGA,并給出滿足“超大震不倒”設(shè)計下安全系數(shù)的選取建議以及前后兩種方案結(jié)構(gòu)各參數(shù)的對比;此外,分析基礎(chǔ)隔震結(jié)構(gòu)的適用條件,得出其具有一定局限性。(3)通過增加隔震結(jié)構(gòu)的柱截面尺寸的方式減小上部結(jié)構(gòu)的層間變形,對6層隔震結(jié)構(gòu)采用該措施設(shè)計并分析其抗震性能,通過對比得出擴大上部結(jié)構(gòu)層間剛度的作用;通過在隔震層增加粘滯阻尼器的方式增加隔震結(jié)構(gòu)的抗震性能,對17層隔震結(jié)構(gòu)在隔震層設(shè)計粘滯阻尼器并分析新的結(jié)構(gòu)地震下響應(yīng),通過對比判斷粘滯阻尼器的作用。
[Abstract]:Isolation technology is the outstanding research result in the field of earthquake resistance of structures in the past 50 years. In recent years, high-rise building structure has become the development trend in the future, high-rise isolation technology has been widely used in China. In recent years, there have been several large earthquakes of more than 9 degrees in China, but the actual fortification intensity of isolated buildings is usually less than 9 degrees. The isolation measures can make the superstructure in elastic or weakly nonlinear state under the action of a large earthquake, and reduce the seismic response of the superstructure. However, in the case of a large earthquake, especially under the action of a very large earthquake, the displacement of the isolated layer can be reduced. The overturning safety of the whole structure needs special study. In this paper, the finite element model of isolated structure is established by SAP2000 and ETABS software, and the dynamic elastic-plastic time-history analysis is carried out. The performance of the isolated structure based on the design of "strong earthquake is not inverted" is studied, and the cost and corresponding design method of anti-earthquake are realized. The main contents are as follows: (1) the isolation structures with the height of 27m ~ 53m and 95m are designed according to the 8-degree fortification, and the three isolation structures are modeled by SAP2000 and ETABS software. Elastoplastic time-history analysis is used to calculate the dynamic response of the structure under the earthquake with a peak acceleration of 70gal-220gal-310gal-310gal-400-gal-510gal-620gal. By comparing the interstory displacement angle of three structures, the displacement of isolation support and the overturning moment of the structure, the collapse mode and the critical PGA, of the structure under the super large earthquake are determined. The super-large earthquake resistance of isolated structures is obtained. (2) by increasing the design safety factor, the anti-super-large earthquake resistance of the structures is increased. In order to improve the seismic resistance of the isolated structure and ensure that it does not pay too much extra cost, the design of the isolation layer is improved without changing the number of the bearings and the arrangement of the bearings. By expanding the bearing section to ensure that the isolated structure can withstand the action of super large earthquakes, the improved interstory displacement angle of the structure, the displacement of the isolation support, and the overturning moment of the structure are analyzed. The failure mode and the critical PGA, of the new structure under the super large earthquake are obtained, and the suggestion of selecting the safety factor under the design of "large earthquake is not collapsed" and the comparison of the structural parameters between the two schemes before and after are given. In addition, by analyzing the applicable conditions of base-isolated structures, it is concluded that they have certain limitations. (3) the interstory deformation of superstructures is reduced by increasing the column section size of the isolated structures. This method is used to design and analyze the aseismic performance of 6-story isolated structure, and the function of enlarging the stiffness of superstructure is obtained by comparison. By adding viscous dampers to the isolation layer to increase the seismic performance of the isolated structure, the paper designs a viscous damper for the 17 story isolated structure and analyzes the response of the new structure under the earthquake. The effect of the viscous damper is judged by comparing the effect of the viscous damper.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU352.12
本文編號：2415776
[Abstract]:Isolation technology is the outstanding research result in the field of earthquake resistance of structures in the past 50 years. In recent years, high-rise building structure has become the development trend in the future, high-rise isolation technology has been widely used in China. In recent years, there have been several large earthquakes of more than 9 degrees in China, but the actual fortification intensity of isolated buildings is usually less than 9 degrees. The isolation measures can make the superstructure in elastic or weakly nonlinear state under the action of a large earthquake, and reduce the seismic response of the superstructure. However, in the case of a large earthquake, especially under the action of a very large earthquake, the displacement of the isolated layer can be reduced. The overturning safety of the whole structure needs special study. In this paper, the finite element model of isolated structure is established by SAP2000 and ETABS software, and the dynamic elastic-plastic time-history analysis is carried out. The performance of the isolated structure based on the design of "strong earthquake is not inverted" is studied, and the cost and corresponding design method of anti-earthquake are realized. The main contents are as follows: (1) the isolation structures with the height of 27m ~ 53m and 95m are designed according to the 8-degree fortification, and the three isolation structures are modeled by SAP2000 and ETABS software. Elastoplastic time-history analysis is used to calculate the dynamic response of the structure under the earthquake with a peak acceleration of 70gal-220gal-310gal-310gal-400-gal-510gal-620gal. By comparing the interstory displacement angle of three structures, the displacement of isolation support and the overturning moment of the structure, the collapse mode and the critical PGA, of the structure under the super large earthquake are determined. The super-large earthquake resistance of isolated structures is obtained. (2) by increasing the design safety factor, the anti-super-large earthquake resistance of the structures is increased. In order to improve the seismic resistance of the isolated structure and ensure that it does not pay too much extra cost, the design of the isolation layer is improved without changing the number of the bearings and the arrangement of the bearings. By expanding the bearing section to ensure that the isolated structure can withstand the action of super large earthquakes, the improved interstory displacement angle of the structure, the displacement of the isolation support, and the overturning moment of the structure are analyzed. The failure mode and the critical PGA, of the new structure under the super large earthquake are obtained, and the suggestion of selecting the safety factor under the design of "large earthquake is not collapsed" and the comparison of the structural parameters between the two schemes before and after are given. In addition, by analyzing the applicable conditions of base-isolated structures, it is concluded that they have certain limitations. (3) the interstory deformation of superstructures is reduced by increasing the column section size of the isolated structures. This method is used to design and analyze the aseismic performance of 6-story isolated structure, and the function of enlarging the stiffness of superstructure is obtained by comparison. By adding viscous dampers to the isolation layer to increase the seismic performance of the isolated structure, the paper designs a viscous damper for the 17 story isolated structure and analyzes the response of the new structure under the earthquake. The effect of the viscous damper is judged by comparing the effect of the viscous damper.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU352.12
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，本文編號：2415776
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