高舉架立式圓筒型儲液容器減震技術(shù)及理論
發(fā)布時間：2018-08-30 16:09
【摘要】：隨著石油化工、建筑工業(yè)、海洋平臺等的發(fā)展,高舉架儲液容器仍然扮演著舉足輕重的角色。此類結(jié)構(gòu)一旦遭遇震害,會危害到人類的生命、財產(chǎn)等。為了減輕地震對高舉架立式圓筒型儲液容器造成的破壞,本文在國內(nèi)外學(xué)者的研究基礎(chǔ)上,針對高舉架立式圓筒型儲液容器結(jié)構(gòu)特點提出了基礎(chǔ)隔震、柱頂隔震、附加粘滯阻尼器減震、粘滯阻尼器與基礎(chǔ)隔震組合減震、粘滯阻尼器與柱頂隔震組合減震五種減震方法,從理論研究及有限元數(shù)值仿真分析兩個方面進行了地震動響應(yīng)對比分析,研究內(nèi)容如下:1.高舉架立式圓筒型儲液容器隔震理論:將支承分散成多個集中質(zhì)點,提出了新的抗震、基礎(chǔ)隔震及柱頂隔震簡化分析力學(xué)模型,給出了運動控制方程,針對不同地震動輸入,采用數(shù)值積分法進行了地震動響應(yīng)對比分析,結(jié)果表明:采用隔震措施后能很好地減小結(jié)構(gòu)地震動響應(yīng),但對儲液晃動波高控制有限,兩種隔震方式減震效率相差不大;隔震設(shè)計需根據(jù)不同場地類型選取合理的隔震周期。2.高舉架立式圓筒型儲液容器附加粘滯阻尼器減震理論:建立了附加粘滯阻尼器的減震模型及運動控制方程,對比分析了不同速度指數(shù)、不同阻尼器配置方案、不同地震動輸入時的地震動響應(yīng),結(jié)果表明:粘滯阻尼器受地震動頻率影響較小,均有較好控制效率;通過在支承結(jié)構(gòu)上附加粘滯阻尼器能夠在一定程度上降低高舉架立式圓筒型儲液容器的晃動波高;粘滯阻尼器阻尼參數(shù)、配置方案等需綜合考慮工程實際情況,優(yōu)化設(shè)計。3.高舉架立式圓筒型儲液容器組合減震理論:建立了兩種組合減震的簡化力學(xué)模型,對比分析了不同地震動輸入、不同儲液高度、不同速度指數(shù)及不同地震動峰值時不同減震方式的減震效果,結(jié)果表明:組合減震措施控制效率要好于單一減震措施,且其優(yōu)勢與速度指數(shù)密切相關(guān)。建議被動控制方式的選取需根據(jù)實際工程抗震要求、場地條件等實際情況,選擇最合適的被動控制方式。4.高舉架立式圓筒型儲液容器隔震有限元數(shù)值仿真分析:建立了基礎(chǔ)隔震和柱頂隔震有限元模型,研究在不同阻尼比、不同隔震周期、不同地震動輸入和不同儲液高度等參數(shù)影響下高舉架立式圓筒型儲液容器的地震響應(yīng)。結(jié)果表明:采用基礎(chǔ)隔震及柱頂隔震后,地震動響應(yīng)減震效果明顯,可優(yōu)化其儲罐、支承和基礎(chǔ)設(shè)計,縮小截面尺寸,降低工程造價;基礎(chǔ)隔震和柱頂隔震的減震率與隔震周期、隔震層阻尼比密切相關(guān)。建議高舉架立式圓筒型儲液容器隔震設(shè)計時需考慮多參數(shù)、多形式影響,選擇最合理隔震方案。5.高舉架立式圓筒型儲液容器粘滯阻尼器減震有限元數(shù)值仿真分析:建立了高舉架立式圓筒型儲液容器粘滯阻尼器減震有限元模型,并進行地震動響應(yīng)分析,結(jié)果表明:粘滯阻尼器減震措施能有效控制支承結(jié)構(gòu)及上部儲罐地震動響應(yīng),同時對儲液的晃動波高有一定控制作用。6.高舉架立式圓筒型儲液容器組合減震有限元數(shù)值仿真分析:建立高舉架立式圓筒型儲液容器組合減震有限元模型。針對不同地震動輸入,對比分析了五種減震方式地震動響應(yīng)減震效率,結(jié)果表明:采用組合減震措施時,隔震層偏移較小,有利于保護隔震層和結(jié)構(gòu)的安全。從耗能角度看,粘滯阻尼器與柱頂隔震組合減震方式使兩種減震措施充分發(fā)揮作用,配置更加合理;采用粘滯阻尼器減震措施及組合減震措施相對采用隔震措施來說,具有更好的適應(yīng)能力,在四種地震動作用下均有較好的減震效果,尤其體現(xiàn)在對層間位移角的控制。減震方式的選取需綜合考慮多種因素的影響,選用經(jīng)濟可靠的減震措施。7.為驗證計算結(jié)果準確性,對結(jié)構(gòu)振型模態(tài)與地震動響應(yīng)的理論值與有限元值進行了對比分析,計算結(jié)果表明:理論值與有限元值較為相似,相互證明了計算結(jié)果的準確性。
[Abstract]:With the development of petrochemical industry, construction industry and offshore platforms, elevated liquid storage containers still play an important role. Once such structures are damaged by earthquakes, they will endanger human life and property. According to the structural characteristics of vertical cylindrical liquid storage vessel with elevated frame, five kinds of seismic reduction methods are put forward, including base isolation, column top isolation, additional viscous damper, combination of viscous damper and base isolation, combination of viscous damper and column top isolation. The ground motion is analyzed by theoretical research and finite element numerical simulation. The main contents of this paper are as follows: 1. Seismic isolation theory of vertical cylindrical liquid storage vessel with elevated frame: the support is dispersed into several concentrated mass points, and a new simplified analytical mechanical model of seismic resistance, base isolation and column top isolation is proposed. The motion control equations are given. According to different seismic input, the seismic response of vertical cylindrical liquid storage vessel is analyzed by numerical integration method. The results show that the isolation measures can reduce the seismic response of the structure, but the control of the sloshing wave height is limited, and the damping efficiency of the two isolation methods is not much different. The isolation design should select a reasonable isolation period according to different site types. Seismic theory: The damping model and motion control equation of viscous dampers are established, and the seismic response of different velocity indices, different dampers configuration schemes and different ground motion inputs are compared and analyzed. The results show that the viscous dampers have better control efficiency because of less influence of ground motion frequencies. Hysteretic dampers can reduce the sloshing wave height of vertical cylindrical liquid storage vessels to a certain extent; damping parameters of viscous dampers and configuration schemes need to be optimized considering the actual situation of the project. 3. Combined damping theory of vertical cylindrical liquid storage vessels with elevated frames: two simplified mechanical models of combined damping are established and compared. The results show that the control efficiency of combined seismic mitigation measures is better than that of single seismic mitigation measures, and its advantages are closely related to the velocity index. Finite element simulation analysis of vertical cylindrical liquid storage vessel with elevated frame structure: the finite element models of base isolation and column top isolation are established, and the effects of different damping ratios, different isolation periods, different seismic input and different liquid storage heights are studied. The results show that the seismic response of vertical cylindrical liquid storage vessel with lower elevated frame can be reduced obviously by using base isolation and column-top isolation, and the damping ratio of base isolation and column-top isolation is close to that of isolation layer. It is suggested that multi-parameter and multi-form influence should be considered in the design of vertical cylindrical liquid storage vessel isolation. 5. Numerical simulation analysis of viscous damper of vertical cylindrical liquid storage vessel with elevated frame is carried out. The finite element model of viscous damper of vertical cylindrical liquid storage vessel with elevated frame is established, and the optimal isolation scheme is selected. The results of seismic response analysis show that the viscous damper can effectively control the seismic response of the supporting structure and the upper storage tank, and also can control the sloshing wave height of the liquid storage. 6. The finite element numerical simulation analysis of the combined damping of the vertical cylindrical storage container with elevated frame: The vertical cylindrical storage container with elevated frame is established. According to different earthquake input, the seismic response reduction efficiency of five seismic isolation methods is compared and analyzed. The results show that the isolation layer deviation is small, which is helpful to protect the safety of the isolation layer and structure. Compared with the isolation measures, the viscous dampers have better adaptability and have better damping effect under four kinds of ground motions, especially in the control of the displacement angle between layers. In order to verify the accuracy of the calculation results, the theoretical values and the finite element values of the structural vibration mode and the ground vibration response are compared and analyzed. The results show that the theoretical values are similar to the finite element values, which prove the accuracy of the calculation results.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU352.12
，
本文編號：2213589
[Abstract]:With the development of petrochemical industry, construction industry and offshore platforms, elevated liquid storage containers still play an important role. Once such structures are damaged by earthquakes, they will endanger human life and property. According to the structural characteristics of vertical cylindrical liquid storage vessel with elevated frame, five kinds of seismic reduction methods are put forward, including base isolation, column top isolation, additional viscous damper, combination of viscous damper and base isolation, combination of viscous damper and column top isolation. The ground motion is analyzed by theoretical research and finite element numerical simulation. The main contents of this paper are as follows: 1. Seismic isolation theory of vertical cylindrical liquid storage vessel with elevated frame: the support is dispersed into several concentrated mass points, and a new simplified analytical mechanical model of seismic resistance, base isolation and column top isolation is proposed. The motion control equations are given. According to different seismic input, the seismic response of vertical cylindrical liquid storage vessel is analyzed by numerical integration method. The results show that the isolation measures can reduce the seismic response of the structure, but the control of the sloshing wave height is limited, and the damping efficiency of the two isolation methods is not much different. The isolation design should select a reasonable isolation period according to different site types. Seismic theory: The damping model and motion control equation of viscous dampers are established, and the seismic response of different velocity indices, different dampers configuration schemes and different ground motion inputs are compared and analyzed. The results show that the viscous dampers have better control efficiency because of less influence of ground motion frequencies. Hysteretic dampers can reduce the sloshing wave height of vertical cylindrical liquid storage vessels to a certain extent; damping parameters of viscous dampers and configuration schemes need to be optimized considering the actual situation of the project. 3. Combined damping theory of vertical cylindrical liquid storage vessels with elevated frames: two simplified mechanical models of combined damping are established and compared. The results show that the control efficiency of combined seismic mitigation measures is better than that of single seismic mitigation measures, and its advantages are closely related to the velocity index. Finite element simulation analysis of vertical cylindrical liquid storage vessel with elevated frame structure: the finite element models of base isolation and column top isolation are established, and the effects of different damping ratios, different isolation periods, different seismic input and different liquid storage heights are studied. The results show that the seismic response of vertical cylindrical liquid storage vessel with lower elevated frame can be reduced obviously by using base isolation and column-top isolation, and the damping ratio of base isolation and column-top isolation is close to that of isolation layer. It is suggested that multi-parameter and multi-form influence should be considered in the design of vertical cylindrical liquid storage vessel isolation. 5. Numerical simulation analysis of viscous damper of vertical cylindrical liquid storage vessel with elevated frame is carried out. The finite element model of viscous damper of vertical cylindrical liquid storage vessel with elevated frame is established, and the optimal isolation scheme is selected. The results of seismic response analysis show that the viscous damper can effectively control the seismic response of the supporting structure and the upper storage tank, and also can control the sloshing wave height of the liquid storage. 6. The finite element numerical simulation analysis of the combined damping of the vertical cylindrical storage container with elevated frame: The vertical cylindrical storage container with elevated frame is established. According to different earthquake input, the seismic response reduction efficiency of five seismic isolation methods is compared and analyzed. The results show that the isolation layer deviation is small, which is helpful to protect the safety of the isolation layer and structure. Compared with the isolation measures, the viscous dampers have better adaptability and have better damping effect under four kinds of ground motions, especially in the control of the displacement angle between layers. In order to verify the accuracy of the calculation results, the theoretical values and the finite element values of the structural vibration mode and the ground vibration response are compared and analyzed. The results show that the theoretical values are similar to the finite element values, which prove the accuracy of the calculation results.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU352.12
，
本文編號：2213589
本文鏈接：http://sikaile.net/jianzhugongchenglunwen/2213589.html
最近更新
教材專著
