基礎(chǔ)隔震在既有建筑物抗震加固中的應(yīng)用研究
發(fā)布時(shí)間：2019-05-31 14:54
【摘要】：基礎(chǔ)隔震是一種獨(dú)特的工程應(yīng)用技術(shù),其主要目的是通過(guò)隔離上部結(jié)構(gòu)與下部結(jié)構(gòu)來(lái)降低結(jié)構(gòu)的地震作用。由于地震作用是從下部結(jié)構(gòu)傳遞到上部結(jié)構(gòu)的,所以用基礎(chǔ)隔震的方法來(lái)隔離上部結(jié)構(gòu)與基礎(chǔ),減少地震能量的傳遞是合理的,并且用此方法能夠更好的減少地震對(duì)結(jié)構(gòu)的不利作用。目前,隔震技術(shù)的應(yīng)用很廣泛,它不僅運(yùn)用于基礎(chǔ)上,而且用于上部結(jié)構(gòu)中部的某一層。隔震技術(shù)通過(guò)改變結(jié)構(gòu)的動(dòng)力特性,使上部結(jié)構(gòu)在地震作用下近似于平動(dòng),以此來(lái)更好的保護(hù)建筑不被破壞。本文利用SAP2000軟件對(duì)華亭縣某四層磚混辦公樓進(jìn)行隔震加固分析,以提高該磚混結(jié)構(gòu)的抗震性能。本文依據(jù)《抗震設(shè)計(jì)規(guī)范》,選擇El Centro波、Cholame Shandon波和Delta Artif波(人工波)對(duì)該隔震結(jié)構(gòu)進(jìn)行時(shí)程反應(yīng)分析。通過(guò)時(shí)程反應(yīng)分析得出三條地震波計(jì)算結(jié)果的平均值相差1.90%,表明三條地震波收斂性很好,地震波選擇合理。此外,通過(guò)結(jié)構(gòu)的反應(yīng)譜分析得到結(jié)構(gòu)的地震反應(yīng),然后比較時(shí)程分析的包絡(luò)值與反應(yīng)譜的計(jì)算結(jié)果。為了驗(yàn)證不同隔震支座對(duì)隔震效果的影響,本論文選擇了兩種隔震支座布置方式。第一種隔震支座是鉛心隔震支座(LRB 400與LRB 500);第二種隔震支座布置方式是鉛心隔震支座(LRB 400與LRB 500)與摩擦隔震支座的混合隔震。然后分別對(duì)兩種隔震結(jié)構(gòu)進(jìn)行隔震分析,對(duì)比隔震和非隔震結(jié)構(gòu)的地震反應(yīng),以及對(duì)比鉛心隔震支座與運(yùn)用混合隔震的結(jié)構(gòu)的基本周期。本文對(duì)鉛心隔震的結(jié)構(gòu)模型,和混合隔震模型進(jìn)行了隔震分析,并與隔震前的結(jié)構(gòu)反應(yīng)和基本周期進(jìn)行了比較,結(jié)果表明,隔震后樓層最大加速度包絡(luò)值減少了65.3%,并且最小加速度包絡(luò)值減少了67%,但是,反應(yīng)譜分析結(jié)果表明:加速度減少了91.3%。時(shí)程分析最大速度包絡(luò)值減少了34%,最小的速度包絡(luò)值減少了32.8%,然而,反應(yīng)譜分析速度減少了57.2%。時(shí)程分析最大位移包絡(luò)值增加了86.8%,最小位移包絡(luò)值增加了87.4%,然而,反應(yīng)譜位移值增加了56%。根據(jù)第一層的層間位移角結(jié)果可知,層間位移角的最大值與最小值都小于規(guī)范的極限(1/100),即最大值為1/186,最小值為-1/169。對(duì)比運(yùn)用兩種類型的隔震技術(shù)的結(jié)構(gòu)在地震作用下的反應(yīng),結(jié)果表明,在相同的地震作用下,運(yùn)用鉛心隔震支座(LRB 400與LRB 500)與摩擦隔震支座的結(jié)合的隔震技術(shù)的結(jié)構(gòu)的基本周期比運(yùn)用鉛心隔震支座(LRB 400與LRB 500)的隔震技術(shù)的結(jié)構(gòu)的基本周期大14.2%。且前者的基本周期比非隔震結(jié)構(gòu)的基本周期大362%。對(duì)比砌體墻的應(yīng)力值,隔震后砌體墻的應(yīng)力最大減少了97.3%。在考慮結(jié)構(gòu)屈曲分析時(shí),屈曲反應(yīng)在隔震后開始發(fā)展,但是并不影響結(jié)構(gòu)安全。另外,對(duì)于基地剪力,時(shí)程分析計(jì)算結(jié)果表明,x方向的最大值減少了70.1%,而y方向的最大值減少了37.2%;x和y方向的最小值分別減少了70.5%和30.0%。計(jì)算表明,隔震技術(shù)的運(yùn)用可以有效的降低樓層的地震力、剪力、扭矩、扭轉(zhuǎn)角和彎矩。本論文也模擬罕遇地震的作用,研究分析了在罕遇地震作用下隔震后結(jié)構(gòu)的層間位移角,結(jié)果表明,其最大值為1/283,最小值為-1/205,均小于規(guī)范要求的1/100。從本文對(duì)磚混辦公樓的地震分析看來(lái),用基礎(chǔ)隔震技術(shù)加固結(jié)構(gòu)可以有效的降低地震反應(yīng),并且在隔震結(jié)構(gòu)計(jì)算分析時(shí)優(yōu)先使用時(shí)程分析,或時(shí)程分析與反應(yīng)譜分析結(jié)合使用。
[Abstract]:Base isolation is a unique engineering application technology. The main purpose is to reduce the seismic effect of the structure by isolating the upper structure and the lower structure. Since the seismic effect is transmitted from the lower structure to the upper structure, the upper structure and the foundation are isolated by the method of base isolation, so that the transmission of the seismic energy is reasonable, and the adverse effect of the earthquake on the structure can be better reduced by using the method. At present, the application of the isolation technology is widely used, which is not only applied to the foundation, but also for a certain layer of the middle part of the upper structure. By changing the dynamic characteristics of the structure, the vibration isolation technology makes the upper structure similar to the translation under the action of the earthquake, so as to better protect the building from being damaged. In this paper, the seismic performance of the brick-concrete structure is improved by using the SAP2000 software to analyze the seismic isolation and strengthening of a four-layer brick-and-concrete office building in Huingting County. In this paper, the time-course response analysis of the isolated structure is carried out in accordance with the Code for Seismic Design, the selection of El Centro, the Cholame Shandon and Delta Artif waves. The mean difference of the results of the three seismic waves by the time-history analysis is 1.90%, which shows that the convergence of the three seismic waves is very good and the selection of the seismic wave is reasonable. In addition, the seismic response of the structure is obtained by the reaction spectrum analysis of the structure, and the envelope value of the time-history analysis and the calculation result of the reaction spectrum are compared. In order to verify the effect of different vibration isolation supports on the seismic isolation effect, two kinds of vibration isolation support arrangements are selected in this paper. The first isolation support is a lead-core shock-isolation support (LRB 400 and LRB 500), and the second type of shock-isolation support is arranged in a hybrid isolation of a lead-core shock-isolation support (LRB 400 and LRB 500) and a friction-isolation support. The seismic response of the isolated and non-isolated structures is compared with the basic period of the structure of the hybrid isolation. In this paper, the structure model of the lead-core vibration isolation and the hybrid isolation model are compared. The results show that the maximum acceleration envelope value is reduced by 65.3%, and the minimum acceleration envelope value is reduced by 67%. However, the results of the analysis show that the acceleration is reduced by 91.3%. The maximum velocity envelope of the time-history analysis is reduced by 34%, and the minimum velocity envelope value is reduced by 32.8%. However, the rate of the response spectrum analysis is reduced by 57.2%. The maximum displacement envelope value of the time-history analysis increased by 86.8% and the minimum displacement envelope value increased by 87.4%. However, the displacement value of the reaction spectrum increased by 56%. According to the inter-layer displacement angle of the first layer, the maximum value and the minimum value of the interlayer displacement angle are smaller than the limit of the specification (1/100), that is, the maximum value is 1/186 and the minimum value is -1/169. The results show that under the same seismic effect, The basic period of the structure of the seismic isolation technique using the combination of the lead-core isolation support (LRB 400 and the LRB 500) and the friction-isolation support is 14.2% larger than the basic period of the structure of the isolation technique using the lead-core isolation support (LRB 400 and the LRB 500). And the basic period of the former is 362% larger than that of the non-isolated structure. The stress value of the masonry wall is compared with that of the masonry wall after the earthquake, and the stress of the masonry wall is reduced by 97.3%. In consideration of the structural buckling analysis, the buckling reaction begins to develop after the earthquake, but does not affect the safety of the structure. In addition, for the base shear, the time-history analysis results show that the maximum value of x-direction is reduced by 70.1%, while the maximum value of y-direction is reduced by 37.2%, and the minimum value in the x and y directions is reduced by 70.5% and 30.0%, respectively. The calculation shows that the application of the seismic isolation technology can effectively reduce the earthquake force, shear force, torque, torsion angle and bending moment of the floor. The paper also simulated the effect of the rare earthquake, and analyzed the inter-layer displacement angle of the post-seismic structure under the effect of the rare earthquake. The results show that the maximum value is 1/283 and the minimum value is-1/205, which is less than 1/100 of the specification. Based on the seismic analysis of the brick-and-concrete office building, the seismic response can be effectively reduced by the base isolation technology, and the time-history analysis is given as a priority in the calculation and analysis of the isolation structure, or the time-history analysis and the response spectrum analysis are used in combination.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU352.12
本文編號(hào)：2489795
[Abstract]:Base isolation is a unique engineering application technology. The main purpose is to reduce the seismic effect of the structure by isolating the upper structure and the lower structure. Since the seismic effect is transmitted from the lower structure to the upper structure, the upper structure and the foundation are isolated by the method of base isolation, so that the transmission of the seismic energy is reasonable, and the adverse effect of the earthquake on the structure can be better reduced by using the method. At present, the application of the isolation technology is widely used, which is not only applied to the foundation, but also for a certain layer of the middle part of the upper structure. By changing the dynamic characteristics of the structure, the vibration isolation technology makes the upper structure similar to the translation under the action of the earthquake, so as to better protect the building from being damaged. In this paper, the seismic performance of the brick-concrete structure is improved by using the SAP2000 software to analyze the seismic isolation and strengthening of a four-layer brick-and-concrete office building in Huingting County. In this paper, the time-course response analysis of the isolated structure is carried out in accordance with the Code for Seismic Design, the selection of El Centro, the Cholame Shandon and Delta Artif waves. The mean difference of the results of the three seismic waves by the time-history analysis is 1.90%, which shows that the convergence of the three seismic waves is very good and the selection of the seismic wave is reasonable. In addition, the seismic response of the structure is obtained by the reaction spectrum analysis of the structure, and the envelope value of the time-history analysis and the calculation result of the reaction spectrum are compared. In order to verify the effect of different vibration isolation supports on the seismic isolation effect, two kinds of vibration isolation support arrangements are selected in this paper. The first isolation support is a lead-core shock-isolation support (LRB 400 and LRB 500), and the second type of shock-isolation support is arranged in a hybrid isolation of a lead-core shock-isolation support (LRB 400 and LRB 500) and a friction-isolation support. The seismic response of the isolated and non-isolated structures is compared with the basic period of the structure of the hybrid isolation. In this paper, the structure model of the lead-core vibration isolation and the hybrid isolation model are compared. The results show that the maximum acceleration envelope value is reduced by 65.3%, and the minimum acceleration envelope value is reduced by 67%. However, the results of the analysis show that the acceleration is reduced by 91.3%. The maximum velocity envelope of the time-history analysis is reduced by 34%, and the minimum velocity envelope value is reduced by 32.8%. However, the rate of the response spectrum analysis is reduced by 57.2%. The maximum displacement envelope value of the time-history analysis increased by 86.8% and the minimum displacement envelope value increased by 87.4%. However, the displacement value of the reaction spectrum increased by 56%. According to the inter-layer displacement angle of the first layer, the maximum value and the minimum value of the interlayer displacement angle are smaller than the limit of the specification (1/100), that is, the maximum value is 1/186 and the minimum value is -1/169. The results show that under the same seismic effect, The basic period of the structure of the seismic isolation technique using the combination of the lead-core isolation support (LRB 400 and the LRB 500) and the friction-isolation support is 14.2% larger than the basic period of the structure of the isolation technique using the lead-core isolation support (LRB 400 and the LRB 500). And the basic period of the former is 362% larger than that of the non-isolated structure. The stress value of the masonry wall is compared with that of the masonry wall after the earthquake, and the stress of the masonry wall is reduced by 97.3%. In consideration of the structural buckling analysis, the buckling reaction begins to develop after the earthquake, but does not affect the safety of the structure. In addition, for the base shear, the time-history analysis results show that the maximum value of x-direction is reduced by 70.1%, while the maximum value of y-direction is reduced by 37.2%, and the minimum value in the x and y directions is reduced by 70.5% and 30.0%, respectively. The calculation shows that the application of the seismic isolation technology can effectively reduce the earthquake force, shear force, torque, torsion angle and bending moment of the floor. The paper also simulated the effect of the rare earthquake, and analyzed the inter-layer displacement angle of the post-seismic structure under the effect of the rare earthquake. The results show that the maximum value is 1/283 and the minimum value is-1/205, which is less than 1/100 of the specification. Based on the seismic analysis of the brick-and-concrete office building, the seismic response can be effectively reduced by the base isolation technology, and the time-history analysis is given as a priority in the calculation and analysis of the isolation structure, or the time-history analysis and the response spectrum analysis are used in combination.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TU352.12
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