發(fā)布時間：2018-06-29 05:20

  本文選題：板式轉(zhuǎn)換層 + 地裂場地��； 參考：《長安大學(xué)》2017年碩士論文

【摘要】：由非地震地裂縫引發(fā)的地面不均勻沉降對各類建筑結(jié)構(gòu)帶來巨大危害。在實際工程中,現(xiàn)有規(guī)程對地裂縫的影響主要采取空間避讓措施,即根據(jù)建筑物的結(jié)構(gòu)形式、安全等級,所處位置(上、下盤)設(shè)定一個最小避讓距離;板式轉(zhuǎn)換層作為高層建筑轉(zhuǎn)換結(jié)構(gòu)的重要形式,其優(yōu)點是下部結(jié)構(gòu)柱網(wǎng)可以靈活布置,無須與上層結(jié)構(gòu)對齊。但由于轉(zhuǎn)換厚板集中了相當大的質(zhì)量與剛度,使得轉(zhuǎn)換層處結(jié)構(gòu)上、下層豎向剛度發(fā)生突變,容易形成薄弱層,對抗震極為不利。本文在現(xiàn)有研究基礎(chǔ)上,研究地裂場地上帶板式轉(zhuǎn)換框支結(jié)構(gòu)抗震性能,以論證高位轉(zhuǎn)換在7度抗震設(shè)防區(qū)內(nèi)地裂場地上的可行性,并在此基礎(chǔ)上探索將規(guī)程規(guī)定的地裂縫影響區(qū)最小避讓距離縮短的可能性,以期為實際工程應(yīng)用提供參考與借鑒。本文完成的主要工作有:(1)以原設(shè)計在6度抗震設(shè)防區(qū)的河南洛陽宏業(yè)廣場高層住宅這一實際工程為例,重新在7度抗震設(shè)防區(qū)內(nèi)普通場地(避讓距離不小于最小避讓距離)上利用有限元軟件對結(jié)構(gòu)進行模態(tài)分析、反應(yīng)譜分析、彈性動力時程分析,靜力彈塑性分析等相關(guān)主要工作;(2)為研究板式轉(zhuǎn)換層設(shè)置位置對結(jié)構(gòu)抗震性能的影響,分別將轉(zhuǎn)換厚板設(shè)置在2層、4層、6層頂,將這3種模型分別從自振周期、結(jié)構(gòu)側(cè)移、層間位移及層間位移角、結(jié)構(gòu)內(nèi)力變化等角度進行對比分析;(3)以宏業(yè)廣場高層住宅為算例,在7度抗震設(shè)防區(qū)內(nèi)地裂場地(避讓距離小于最小避讓距離)上研究結(jié)構(gòu)層間位移、層間位移角以及內(nèi)力隨避讓距離減小的變化規(guī)律,并將其與在普通場地上(僅考慮地震作用)的層間位移、層間位移角以及內(nèi)力進行對比分析,在此基礎(chǔ)上求得最合理的避讓距離。通過研究發(fā)現(xiàn):(1)以宏業(yè)廣場高層住宅這一工程實例具體研究分析來看,其在7度抗震設(shè)防區(qū)內(nèi)普通場地上結(jié)構(gòu)抗震性能指標依舊滿足規(guī)范要求;(2)通過3種模型對比分析發(fā)現(xiàn),隨著轉(zhuǎn)換層位置的提高,結(jié)構(gòu)的自振周期、層間位移及層間位移角,結(jié)構(gòu)內(nèi)力呈現(xiàn)一定的規(guī)律變化。并證明高位轉(zhuǎn)換在7度抗震設(shè)防區(qū)具有可行性,但須對薄弱層進行適度加強;(3)地基不均勻沉降對結(jié)構(gòu)的抗震性能的影響較為顯著,在實際工程中應(yīng)引起重視,合理的避讓距離仍待進一步研究。
[Abstract]:The uneven settlement caused by non-seismic ground fissures brings great harm to all kinds of building structures. In actual engineering, the influence of existing regulations on ground fissures is mainly taken space avoiding measures, that is, according to the structure form of the building, safety grade, the location (upper, lower) set a minimum avoiding distance; As an important form of high rise building transfer structure, the plate transfer layer has the advantage that the column network of the lower structure can be arranged flexibly without alignment with the upper structure. However, due to the large mass and stiffness of the transfer thick plate, the vertical stiffness of the lower layer changes on the transfer floor, which makes it easy to form a weak layer, which is extremely unfavorable to the earthquake resistance. On the basis of the existing research, this paper studies the seismic behavior of the structure with slab transfer frame support on the ground fissure site to prove the feasibility of the high level conversion on the ground crack site in the 7 degree seismic fortification area. On this basis, the possibility of shortening the minimum circumvention distance of the affected area of ground fissures stipulated by the regulations is explored, in order to provide reference and reference for practical engineering application. The main works of this paper are as follows: (1) take the actual project of the high-rise residence of Hongye Square in Luoyang, Henan Province, which was originally designed in the 6 degree seismic fortification area, as an example. The modal analysis, response spectrum analysis, elastic dynamic time-history analysis of the structure are carried out on the normal site of 7 degree seismic fortification area (the avoiding distance is not less than the minimum avoiding distance) by using the finite element software. (2) in order to study the influence of the location of the plate transfer layer on the seismic performance of the structure, the transfer thick plate was set at the top of 2 or 4 stories and 6 stories, respectively, and the three models were shifted from the natural vibration period to the side of the structure, respectively, in order to study the influence of the location of the plate transfer layer on the seismic performance of the structure. (3) taking Hongye Square high-rise residence as an example, the displacement of the structure is studied on the ground crack site in the 7 degree seismic fortification area (the avoiding distance is less than the minimum distance). The variation of interstory displacement angle and internal force with the decrease of avoiding distance is compared with the interstory displacement, interstory displacement angle and internal force on the common site (only considering earthquake action). On this basis, the most reasonable distance to avoid. It is found that: (1) the concrete research and analysis of Hongye Square high-rise residence shows that the seismic performance index of the structure on the ordinary site in the 7 degree seismic fortification area still meets the requirements of the code; (2) through the comparative analysis of three models, it is found that, With the increase of the position of the transfer layer, the natural vibration period, interstory displacement and interstory displacement angle of the structure, and the internal force of the structure show a certain law change. It is proved that high level conversion is feasible in 7 degree seismic fortification area, but the weak layer should be strengthened moderately. (3) the influence of uneven settlement of foundation on seismic performance of structure is obvious, which should be paid more attention to in practical engineering. The reasonable distance of avoidance still needs further study.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU973.31

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