本文選題：BRB　切入點：受損單層網(wǎng)殼結(jié)構(gòu)　出處：《蘭州理工大學(xué)》2013年碩士論文

【摘要】：目前,我國已經(jīng)建成了許多大跨度空間網(wǎng)殼結(jié)構(gòu),結(jié)構(gòu)在使用過程中,由于各種原因會使既有大跨網(wǎng)殼結(jié)構(gòu)出現(xiàn)不同程度的損傷,而損傷的存在對網(wǎng)殼結(jié)構(gòu)的受力性能是極為不利的,會極大地降低結(jié)構(gòu)的極限承載力和抗震能力,使得原本抗震性能優(yōu)異的網(wǎng)殼在強(qiáng)震作用下會出現(xiàn)失效、倒塌的可能。我國是地震多發(fā)國,大跨網(wǎng)殼結(jié)構(gòu)一般又都屬于人流密集的重要公共建筑,使得其抗震性能優(yōu)劣關(guān)系十分重大。因此,對受損大跨網(wǎng)殼結(jié)構(gòu)損傷評價并進(jìn)行抗震加固修復(fù)后,能否繼續(xù)正常工作并且具有良好的抗震能力,是一個十分有必要去解決的問題,但是關(guān)于這方面的研究目前尚不成熟。 BRB(約束屈曲支撐)是目前擁有廣泛應(yīng)用前景的耗能減震構(gòu)件,施工安裝方便、經(jīng)濟(jì)、設(shè)計靈活而且不影響建筑物的美觀,使其不僅成為新建結(jié)構(gòu)抗震設(shè)計的較佳選擇,也是已建受損結(jié)構(gòu)抗震加固和改造的重要手段。因此本文對約束屈曲支撐在受損大跨網(wǎng)殼結(jié)構(gòu)抗震加固中的應(yīng)用研究展開了分析。 根據(jù)剩余模態(tài)力理論運(yùn)用ANSYS有限元軟件并結(jié)合模態(tài)實驗測試結(jié)果對一受損網(wǎng)殼結(jié)構(gòu)進(jìn)行基于固有頻率變化方法的損傷評價以建立較精確的受損網(wǎng)殼結(jié)構(gòu)數(shù)值模型,通過對其進(jìn)行靜力和動力性能分析,提出三種抗震加固方案(方案一,將所有受損桿件進(jìn)行原桿替換修復(fù)；方案二,利用BRB替換所有的受損桿件；方案三,將受損較輕微的桿件替換為原桿,將受損較嚴(yán)重的桿件替換為BRB)。首先對加固前后的模型進(jìn)行了靜力安全性分析,其次選擇EL-Centro波,天津波,Taft波罕遇地震記錄,按三向輸入進(jìn)行動力時程分析并進(jìn)行方案對比。然后,從網(wǎng)殼結(jié)構(gòu)形式、BRB屈服強(qiáng)度、尺寸大小以及地震動加速度峰值等方面進(jìn)行參數(shù)分析。最后對雅丹觀光塔不規(guī)則雙層網(wǎng)格結(jié)構(gòu)進(jìn)行設(shè)計分析,找出結(jié)構(gòu)關(guān)鍵桿件,并假設(shè)部分桿件受損,對其進(jìn)行結(jié)構(gòu)剩余承載力評價。 通過分析得出以下結(jié)論：BRB不僅可以對新建結(jié)構(gòu)進(jìn)行抗震設(shè)計,也可以成為已有受損結(jié)構(gòu)抗震加固和改造的重要手段。通過對三種方案加固后的結(jié)構(gòu)在正常工作狀態(tài)下的靜力安全性分析以及在不同地震波記錄作用下的動力響應(yīng)分析,說明利用BRB進(jìn)行受損網(wǎng)殼結(jié)構(gòu)的抗震加固在保證結(jié)構(gòu)正常使用靜力安全性的前提下,能夠很好地改善結(jié)構(gòu)的抗震性能。網(wǎng)殼結(jié)構(gòu)跨度越大、地震動加速度幅值越高,約束屈曲支撐的抗震加固效果越好；BRB屈服強(qiáng)度為80MPa、100MPa,截面尺寸為0.8倍和1.0倍原桿截面時抗震加固效果較好；而且在進(jìn)行網(wǎng)殼結(jié)構(gòu)分析時不應(yīng)該忽視下部支撐對上部結(jié)構(gòu)的影響。對一些實際工程可以結(jié)合各工況荷載設(shè)計分析的結(jié)果,假設(shè)結(jié)構(gòu)部分桿件出現(xiàn)損傷,通過結(jié)構(gòu)剩余承載力評價的方法找出結(jié)構(gòu)的關(guān)鍵桿件,對后期的施工與使用提供指導(dǎo)。
[Abstract]:At present, many long-span space latticed shell structures have been built in our country. In the process of using, the existing long-span latticed shell structures will be damaged to varying degrees due to various reasons. However, the existence of damage is unfavorable to the mechanical performance of latticed shell structure, which will greatly reduce the ultimate bearing capacity and seismic capacity of the structure, and make the original reticulated shell with excellent seismic performance appear failure under the action of strong earthquake. The possibility of collapse. China is an earthquake-prone country, and the long-span latticed shell structure generally belongs to an important public building with dense flow, which makes its seismic performance very important. It is very necessary to solve the problem of damage evaluation and seismic reinforcement of long-span latticed shell structure, whether it can continue to work normally and have good seismic capacity, but the research on this aspect is not mature at present. BRBs (constrained buckling braces) are energy dissipation shock absorbers with wide application prospects. They are easy to install, economical, flexible in design and do not affect the beauty of buildings, making them not only a better choice for aseismic design of newly built structures, but also a good choice for aseismic design of new structures. It is also an important means for seismic reinforcement and reconstruction of damaged structures. Therefore, the application of constrained buckling braces in seismic reinforcement of long-span latticed shell structures is analyzed in this paper. According to the residual modal force theory, the damage evaluation of a damaged latticed shell structure based on the natural frequency variation method is carried out by using the finite element software ANSYS and the results of the modal experiment to establish a more accurate numerical model of the damaged latticed shell structure. Through the static and dynamic performance analysis, three kinds of seismic reinforcement schemes are put forward: one is to replace all the damaged members with the original rod; the other is to replace all the damaged members with BRB; the third is to replace all the damaged members. The less damaged member is replaced by the original rod, and the severely damaged member is replaced by BRB.Firstly, the static safety analysis of the model before and after reinforcement is carried out, and then the EL-Centro wave, Tianjin wave and Taft Bohan seismic records are selected. The dynamic time history analysis is carried out according to the three-direction input and the scheme is compared. Then, the BRB yield strength is obtained from the reticulated shell structure. Finally, the irregular double-layer grid structure of Yadan sightseeing tower is designed and analyzed, and the key members of the structure are found out, and some of the members are assumed to be damaged. The residual bearing capacity of the structure is evaluated. Through the analysis, we can draw the following conclusion: 1. BRB can not only be used for seismic design of newly built structures, It can also become an important means of seismic reinforcement and reconstruction of existing damaged structures. Through the static safety analysis of the structures strengthened by three schemes under normal working conditions and the dynamic response analysis under the action of different seismic wave records, It is shown that seismic reinforcement of damaged latticed shell structure by BRB can improve the seismic performance of the structure on the premise of ensuring the static safety of the structure in normal use. The larger the span of the latticed shell structure, the higher the acceleration amplitude of ground motion. The better the seismic strengthening effect of restrained buckling braces is, the better the effect of seismic reinforcement is when the yield strength of BRB is 80 MPA / 100 MPa, the cross section size is 0.8 times and 1.0 times the original bar section. In addition, the influence of the lower support on the superstructure should not be ignored in the analysis of the latticed shell structure. For some practical projects, the damage of some members of the structure can be assumed by combining the results of the design and analysis of the loads under various working conditions. The key members of the structure are found by the method of evaluation of the residual bearing capacity of the structure, which provides guidance for the construction and use of the structure in the later stage.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU33

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