本文選題：防屈曲支撐 + 擬靜力試驗(yàn)�。� 參考：《大連理工大學(xué)》2015年博士論文

【摘要】：框架-支撐結(jié)構(gòu)體系具有良好的抗側(cè)剛度。傳統(tǒng)中心支撐由穩(wěn)定性控制,需嚴(yán)格控制其長(zhǎng)細(xì)比。而防屈曲支撐兼具中心支撐和位移型阻尼器的功能,具有更飽滿的滯回曲線,無強(qiáng)度及剛度退化現(xiàn)象,拉壓恢復(fù)力特性相近,耗能能力較強(qiáng)。本文在已有防屈曲支撐框架結(jié)構(gòu)研究的基礎(chǔ)上,對(duì)以下幾個(gè)方面展開了研究工作：(1)對(duì)由平板截面焊接組合而成且芯板為低屈服點(diǎn)鋼的腹板式防屈曲支撐進(jìn)行擬靜力往復(fù)加載試驗(yàn)以研究其耗能機(jī)理,并通過數(shù)值模擬對(duì)其滯回行為進(jìn)行了驗(yàn)證。試驗(yàn)和數(shù)值結(jié)果表明,所設(shè)計(jì)的防屈曲支撐具有良好的滯回耗能能力。(2)對(duì)分別裝有上述腹板式防屈曲支撐和普通支撐的框架結(jié)構(gòu)進(jìn)行振動(dòng)臺(tái)試驗(yàn),比較了這兩種支撐的減震效果,并對(duì)該試驗(yàn)過程進(jìn)行了數(shù)值模擬。試驗(yàn)及數(shù)值結(jié)果表明,腹板式防屈曲支撐對(duì)結(jié)構(gòu)的位移反應(yīng)有更好的控制效果,是一種理想的消能減震裝置。(3)基于現(xiàn)有地震損傷模型及其量化標(biāo)準(zhǔn),研究并提出了基于地震損傷的防屈曲支撐框架結(jié)構(gòu)抗震設(shè)計(jì)方法；該方法采用剛度比單參數(shù)損傷模型描述框架結(jié)構(gòu)的剛度退化情況,結(jié)合改進(jìn)的能力譜法進(jìn)行損傷評(píng)估以確定腹板式防屈曲支撐的設(shè)計(jì)參數(shù)；所提抗震設(shè)計(jì)方法的實(shí)用性和有效性通過某一工程實(shí)例得以驗(yàn)證。(4)基于遺傳算法基本理論,對(duì)防屈曲支撐在框架結(jié)構(gòu)中的位置優(yōu)化進(jìn)行了研究,提出了以地震損傷為位置優(yōu)化標(biāo)準(zhǔn),并提出了相應(yīng)的優(yōu)化目標(biāo)函數(shù)；將所提方法應(yīng)用于實(shí)際工程中,證明了其能夠最優(yōu)的實(shí)現(xiàn)防屈曲支撐對(duì)結(jié)構(gòu)的控制效果。(5)考慮鋼筋銹蝕及地震損傷對(duì)既有建筑結(jié)構(gòu)抗震性能的影響,以地震損傷指數(shù)為抗震性能目標(biāo),提出了基于腹板式防屈曲支撐的既有建筑結(jié)構(gòu)加固分析方法；給出了加固分析及設(shè)計(jì)流程；以一工程實(shí)例驗(yàn)證了所提加固分析方法的實(shí)用性及有效性。(6)將上述腹板式防屈曲支撐應(yīng)用到某鋼框架結(jié)構(gòu)中,以加強(qiáng)該結(jié)構(gòu)中的薄弱環(huán)節(jié),為防屈曲支撐結(jié)構(gòu)的設(shè)計(jì)提供參考。數(shù)值結(jié)果表明,本文的腹板式防屈曲支撐對(duì)該結(jié)構(gòu)在地震作用下的結(jié)構(gòu)響應(yīng)具有較好的控制作用,薄弱層得到了明顯加強(qiáng)。
[Abstract]:The frame-braced structure system has good lateral stiffness. The traditional central support is controlled by stability, and its aspect ratio should be strictly controlled. The anti-buckling braces have the functions of both central bracing and displacement-type dampers. They have more full hysteretic curves, no degradation of strength and stiffness, similar characteristics of tension and compression restoring forces, and strong energy dissipation ability. In this paper, based on the existing research on buckling braced frame structure, In this paper, the following research work has been carried out: 1) Quasi-static reciprocating loading tests on the web plate buckling braces made of welded flat plate steel with core plate as low yield point steel are carried out to study the mechanism of energy dissipation. The hysteretic behavior is verified by numerical simulation. The experimental and numerical results show that the designed anti-buckling braces have good hysteretic energy dissipation capability. The shock absorption effects of the two kinds of braces are compared, and the experimental process is numerically simulated. The experimental and numerical results show that the web plate anti-buckling bracing has better control effect on the displacement response of the structure and is an ideal energy dissipation device based on the existing earthquake damage model and its quantitative standard. The seismic design method of buckling braced frame structure based on earthquake damage is studied and proposed, and the stiffness degradation of frame structure is described by using the stiffness ratio of single parameter damage model. Combined with the improved capability spectrum method to evaluate the damage to determine the design parameters of the web plate buckling braces, the practicability and effectiveness of the proposed seismic design method can be verified by an engineering example) based on the basic theory of genetic algorithm. In this paper, the position optimization of buckle-resistant braces in frame structures is studied, and the optimum standard of seismic damage is put forward, and the corresponding optimization objective function is put forward, and the proposed method is applied to practical engineering. It is proved that it can best realize the control effect of buckling bracing on the structure. (5) considering the influence of steel bar corrosion and earthquake damage on the seismic performance of existing building structures, the seismic damage index is taken as the seismic performance target. The reinforcement analysis method of the existing building structure based on the web plate buckling bracing is put forward, and the reinforcement analysis and design flow chart are given. An engineering example is given to verify the practicability and effectiveness of the proposed reinforcement analysis method. The above web plate buckling braces are applied to a steel frame structure to strengthen the weak links in the structure and to provide a reference for the design of the buckling bracing structure. The numerical results show that the web plate buckling bracing in this paper has a good control effect on the structural response of the structure under earthquake, and the weak layer is obviously strengthened.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU352.11

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