【摘要】：長周期地震動具有峰值加速度相對較低,持時長等特點。歷史上發(fā)生的歷次大地震中記錄的長周期地震動表明,震級、震中距和局部場地條件對長周期地震動的產(chǎn)生有十分重要的影響,震級越大,長周期地震動越豐富。 本文總結(jié)認為,對具有深厚覆蓋土層的場地,假設其方圓能產(chǎn)生遠場效應的距離有發(fā)生大地震的地質(zhì)構造,就有發(fā)生長周期地震動的可能性。長周期地震動會使超限高層等柔性結(jié)構產(chǎn)生大位移、高速度及大幅度的搖擺,可能會產(chǎn)生預期之外的損傷和破壞,長周期地震動作用下超高層的抗震性能將會遭受考驗。 為研究長周期地震動對超限高層結(jié)構的影響,本文以蘭州紅樓時代廣場為對象,選取一條普通地震動記錄和四條長周期地震動記錄分別沿單向和雙向?qū)Y(jié)構進行激勵。多遇地震作用下的線性時程分析和罕遇地震作用下的非線性時程分析結(jié)果表明,長周期地震動對超限高層結(jié)構影響很大。長周期地震動作用下超限高層結(jié)構不僅頂點位移遠大于普通地震動,結(jié)構樓層位移和層間位移角均明顯大于普通地震動記錄作用下的響應值,其中長周期地震動在小震和大震作用下結(jié)構的層間位移角要大于規(guī)范規(guī)定的層間角位移限值；長周期地震動作用下的結(jié)構基底剪力也會超出普通地震動作用下的基底剪力。因此,在有可能發(fā)生長周期地震動場地上建設的高層及超限高層建筑,其抗震設計應充分考慮長周期地震動的不利影響。 最后,以一未調(diào)幅的長周期地震動作用下該超限高層結(jié)構的彈性時程分析與普通地震動多遇烈度水準作用下的動力響應分析結(jié)果比較表明,長周期地震動作用下結(jié)構的動力響應更加明顯。因此,應充分重視長周期地震動對超限高層結(jié)構的影響。
[Abstract]:Long period ground motion is characterized by relatively low peak acceleration and long duration. The long-period ground motion recorded in all the major earthquakes in history shows that the magnitude, epicentral distance and local site conditions have a very important effect on the generation of long-period ground motion, and the larger the magnitude, the richer the long-period ground motion. In this paper, it is concluded that for a site with deep overlying soil, it is possible to produce periodic ground motion if the geological structure with large earthquake occurs at the distance from which the far field effect can be produced by its square circle. The long-period ground motion will cause large displacement, high speed and large swing of flexible structures such as over-limit tall buildings, which may lead to unexpected damage and damage, and the seismic performance of super-tall buildings will be tested under the action of long-period ground motion. In order to study the effect of long-period ground motion on the over-limited high-rise structure, this paper takes Lanzhou Honglou Times Square as an object, selects one ordinary ground motion record and four long-period ground motion records to excite the structure in one direction and two directions, respectively. The results of linear time-history analysis under frequent earthquake and nonlinear time-history analysis under rare earthquake show that long-period ground motion has great influence on over-limit high-rise structures. Under the action of long-period ground motion, not only the vertex displacement is much larger than that of ordinary ground motion, but also the floor displacement and interstory displacement angle are obviously larger than the response value under the action of ordinary ground motion record. The interstory displacement angle of long-period ground motion under the action of small earthquake and large earthquake is larger than the limit value of interstory angular displacement stipulated in the code, and the base shear force of the structure under long-period ground motion is also higher than that of the base shear force under the action of ordinary ground motion. Therefore, the seismic design of high-rise and over-limited high-rise buildings built on sites where long-period ground motions may occur should fully consider the adverse effects of long-period ground motions. Finally, the elastic time-history analysis of the structure under the action of an unmodulated long-period ground motion is compared with that of the dynamic response analysis under the action of ordinary ground motion intensity leveling. The dynamic response of the structure under long period ground motion is more obvious. Therefore, full attention should be paid to the effect of long period ground motion on overrun tall structures.
【學位授予單位】：蘭州理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU973.31

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本文編號：2130981