【摘要】：上世紀(jì)以來(lái)，世界范圍內(nèi)的大地震已造成了慘痛的人員傷亡與巨大的經(jīng)濟(jì)損失。各國(guó)也愈發(fā)重視抗震工程的研究，因此消能減震技術(shù)得以迅速地發(fā)展。防屈曲支撐的發(fā)明初衷是為了防止普通支撐在地震往復(fù)荷載下的受壓屈曲，而研究表明，防屈曲支撐不僅能夠提高結(jié)構(gòu)的側(cè)向剛度，還可以耗散地震能量。目前的研究多集中于外圍約束單元為鋼筋混凝土、鋼管混凝土或方鋼管、圓鋼管的防屈曲支撐，且對(duì)于以不同鋼材作為內(nèi)核芯材的防屈曲支撐對(duì)結(jié)構(gòu)整體抗震性能的影響尚未有具體的研究成果。本文針對(duì)一種一字形內(nèi)核外包雙腹板工字形鋼的新型防屈曲支撐進(jìn)行了試驗(yàn)及數(shù)值研究，主要內(nèi)容如下： 首先對(duì)采用LY225和SN490這兩種不同芯材的8根防屈曲支撐構(gòu)件進(jìn)行循環(huán)往復(fù)加載試驗(yàn)，研究該一字形防屈曲支撐在循環(huán)往復(fù)荷載作用下的滯回曲線、受力性能、破壞模式，并通過(guò)對(duì)比試驗(yàn)，考察該支撐在不同內(nèi)核芯材和不同支撐長(zhǎng)度下的性能差異。結(jié)果表明以LY225為內(nèi)核芯材的支撐的低周疲勞性能、塑性變形能力、附加阻尼比、延性等都優(yōu)于以SN490為內(nèi)核芯材的支撐，支撐長(zhǎng)度增加，其低周疲勞性能和塑性變形能力會(huì)有所降低，支撐的受壓段強(qiáng)化幅度則增大。 其次，通過(guò)有限元軟件ABAQUS對(duì)試驗(yàn)的試件進(jìn)行簡(jiǎn)化數(shù)值模擬。由于鋼材的強(qiáng)化，目前廣泛運(yùn)用的雙折線及三折線模型無(wú)法準(zhǔn)確模擬往復(fù)荷載下支撐的響應(yīng)，，構(gòu)件的耗能能力與承載力水平明顯被低估。本文利用隨動(dòng)強(qiáng)化和等向強(qiáng)化的組合模型提出試件的桿單元參數(shù)設(shè)定，旨在準(zhǔn)確模擬不同芯材下支撐的滯回曲線形狀，以進(jìn)行帶防屈曲支撐框架結(jié)構(gòu)的彈塑性分析。 最后，設(shè)計(jì)了兩棟混凝土框架結(jié)構(gòu)，分別添加了以SN490、LY225和LY100為內(nèi)核芯材的防屈曲支撐，并設(shè)定支撐剛度一致和屈服力一致兩種工況，進(jìn)行了各烈度下結(jié)構(gòu)的彈塑性時(shí)程分析。結(jié)果表明：在支撐剛度已定的情況下：對(duì)于多層框架結(jié)構(gòu)，選用SN490作內(nèi)核芯材的支撐減震效果要優(yōu)于LY225和LY100；對(duì)于高層結(jié)構(gòu)，選用LY100為內(nèi)核芯材則能得到更小的層間位移。在支撐屈服荷載已定的情況下，選用LY100為內(nèi)核芯材的減震效果最好；人字形防屈曲支撐的交叉處梁容易出現(xiàn)塑性鉸。
[Abstract]:Since last century, large earthquakes around the world have caused heavy casualties and huge economic losses. Various countries pay more and more attention to the research of seismic engineering, so the technology of energy dissipation and shock absorption has been developed rapidly. The original purpose of anti-buckling bracing is to prevent the buckling of ordinary braces under seismic reciprocating load. The research shows that buckle-resistant braces can not only improve the lateral stiffness of structures but also dissipate seismic energy. At present, most of the research focuses on the buckling-resistant brace of reinforced concrete, concrete-filled steel tube or square steel tube, and circular steel tube. Moreover, there has not been any concrete research results on the effect of anti-buckling braces with different steel core materials on the overall seismic performance of the structure. In this paper, an experimental and numerical study on a new type of anti-buckling bracing with double web I-shaped steel with one-zigzag core is carried out. The main contents are as follows: firstly, the cyclic loading tests of eight buckling bracing members with LY225 and SN490 cores are carried out, and the hysteretic curves of the zigzag buckling braces under cyclic reciprocating loads are studied. The performance of the support under different core material and different length of bracing is investigated by comparing the performance of the bracing with the failure mode and the performance difference of the brace under different core material and different supporting length. The results show that the low cycle fatigue performance, plastic deformation ability, additional damping ratio and ductility of LY225 as core material are better than those of SN490 core material, and the support length is increased. The low cycle fatigue performance and plastic deformation ability of the support will be decreased, and the strengthening range of the compression section of the brace will be increased. Secondly, simplified numerical simulation of the test specimen is carried out by finite element software ABAQUS. Due to the strengthening of steel, the widely used double-line and three-fold line models can not accurately simulate the response of braces under reciprocating load, and the energy dissipation capacity and bearing capacity of members are obviously underestimated. In this paper, the parameters of the bar element of the specimen are set up by using the combined model of the following strengthening and isotropic strengthening. The purpose of this paper is to accurately simulate the hysteretic curve shape of the bracing under different core materials, and to carry out the elastic-plastic analysis of the frame structure with buckle-resistant braces. Finally, two concrete frame structures are designed, and the anti-buckling braces with SN490,LY225 and LY100 as core materials are added respectively, and the elastic-plastic time-history analysis of the structures under different intensity is carried out by setting two conditions of uniform support stiffness and yield force. The results show that, for multi-story frame structure, the effect of SN490 as core material is better than that of LY225 and LY100; for high-rise structure, and LY100 as core material can get smaller layer displacement for multi-story frame structure. Under the condition that the yield load of the braces has been fixed, the damping effect of LY100 as the core material is the best, and the plastic hinge is easy to appear in the crossbeam with the herringbone buckling braces.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU392.1;TU352.11

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