本文選題：防屈曲支撐 + 整體穩(wěn)定性�。� 參考：《哈爾濱工業(yè)大學(xué)》2015年博士論文

【摘要】：防屈曲支撐是一種利用軟鋼屈服來消耗地震能量的支撐構(gòu)件,其兼具普通支撐和金屬阻尼器的優(yōu)點(diǎn),小震下能夠給結(jié)構(gòu)提供附加剛度,大震下能實(shí)現(xiàn)全截面屈服消耗地震能量。防屈曲支撐的構(gòu)成比較簡(jiǎn)單,主要由耗能內(nèi)芯以及約束內(nèi)芯屈曲的約束構(gòu)件兩部分組成。但是其屈曲機(jī)理卻較為復(fù)雜,因?yàn)榉狼蔚恼w與局部穩(wěn)定性不僅與支撐的剛度、強(qiáng)度、內(nèi)芯與約束構(gòu)件的初始缺陷密切相關(guān),而且受到內(nèi)芯的彈塑性變形、內(nèi)芯加強(qiáng)段、間隙以及內(nèi)芯與約束構(gòu)件間摩擦力等的影響,因此防屈曲支撐的分析與設(shè)計(jì)方法引起了相關(guān)學(xué)者的廣泛興趣。本文主要研究防屈曲支撐內(nèi)芯屈曲機(jī)理以及在此基礎(chǔ)上建立的支撐整體穩(wěn)定設(shè)計(jì)方法,主要研究?jī)?nèi)容及結(jié)論如下:(1)對(duì)組合鋼管混凝土式防屈曲支撐進(jìn)行了五個(gè)試件的試驗(yàn),包括足尺截面短試件試驗(yàn)、足尺試件試驗(yàn)、防屈曲支撐組合件試驗(yàn)以及對(duì)其構(gòu)造形式改進(jìn)后進(jìn)行的波形驗(yàn)證試驗(yàn)。較為詳細(xì)地介紹了這種形式防屈曲支撐的加工過程,指出了生產(chǎn)過程中需要注意的問題,通過試驗(yàn)發(fā)現(xiàn)了加工中容易出現(xiàn)的錯(cuò)誤。對(duì)所提出的支撐形式進(jìn)行了改進(jìn)以使其應(yīng)用到波形驗(yàn)證試驗(yàn)中,在內(nèi)芯表面粘貼應(yīng)變片測(cè)量了內(nèi)芯在加載過程中的應(yīng)變變化。(2)對(duì)防屈曲支撐的內(nèi)芯屈曲機(jī)理進(jìn)行了研究,建立了簡(jiǎn)化的防屈曲支撐分析模型,該模型假設(shè)約束構(gòu)件為剛體且無初始缺陷,內(nèi)芯為無初始缺陷的直桿。通過內(nèi)芯的平衡微分方程及其邊界條件,得到內(nèi)芯撓度曲線和內(nèi)芯與約束構(gòu)件間接觸力的表達(dá)式。通過對(duì)內(nèi)芯彎矩的分析發(fā)現(xiàn)了其一點(diǎn)接觸到兩點(diǎn)接觸轉(zhuǎn)化的規(guī)律,本文給出了其臨界力并進(jìn)一步揭示了其向更多點(diǎn)接觸轉(zhuǎn)化的一般規(guī)律。對(duì)多點(diǎn)接觸狀態(tài)給出了接觸點(diǎn)之間距離的表達(dá)式與最大接觸力的公式,并據(jù)此給出了約束構(gòu)件最大彎矩的計(jì)算公式,這是防屈曲支撐研究方面首次根據(jù)接觸力與波長(zhǎng)直接計(jì)算得到約束構(gòu)件的最大彎矩。之后,給出了固結(jié)支撐的推導(dǎo)結(jié)果,并利用有限元軟件對(duì)本章所提鉸接及固結(jié)防屈曲支撐的波形變化過程與接觸力公式進(jìn)行了有限元驗(yàn)證。最后,利用有關(guān)學(xué)者對(duì)于壓桿屈服后模量的理論,將彈性分析的結(jié)果擴(kuò)展到塑性階段,使用有限元模型的分析比較了折合彈性模量和切線模量的計(jì)算結(jié)果與模擬值的差別,給出了內(nèi)芯屈服后模量取值的建議。(3)提出了一種考慮內(nèi)芯屈曲模態(tài)的防屈曲支撐整體穩(wěn)定設(shè)計(jì)方法,將簡(jiǎn)化的防屈曲支撐分析結(jié)果擴(kuò)展到更一般性的情況。分析中引入了約束構(gòu)件的剛度,因此考慮了約束構(gòu)件變形,同時(shí)考慮了內(nèi)芯加強(qiáng)段的影響。對(duì)內(nèi)芯與約束構(gòu)件同時(shí)列出平衡微分方程,并根據(jù)二者之間的變形協(xié)調(diào)條件得到一點(diǎn)與兩點(diǎn)接觸時(shí)內(nèi)芯的撓度曲線,并得到內(nèi)芯與約束構(gòu)件接觸力、約束構(gòu)件最大彎矩和加強(qiáng)段最大彎矩的表達(dá)式。對(duì)其中使用的接觸點(diǎn)處內(nèi)芯切線斜率為零與彎矩為零的假設(shè)進(jìn)行了參數(shù)分析驗(yàn)證,之后利用多點(diǎn)接觸下約束構(gòu)件的受力特征,將兩點(diǎn)接觸的分析擴(kuò)展到更多點(diǎn)接觸的情況,從而得到了更一般性的結(jié)論。為了簡(jiǎn)化計(jì)算過程,提出了計(jì)算最大接觸力、約束構(gòu)件和加強(qiáng)段最大彎矩的統(tǒng)一公式,并給出了約束構(gòu)件與加強(qiáng)段的設(shè)計(jì)準(zhǔn)則。(4)建立了帶有端部的防屈曲支撐有限元模型,并在該模型中考慮約束構(gòu)件變形,對(duì)本文所推導(dǎo)的結(jié)論進(jìn)行了驗(yàn)證。在有限元分析中,首先檢驗(yàn)了內(nèi)芯由一點(diǎn)接觸到多點(diǎn)接觸的發(fā)展過程;然后,對(duì)內(nèi)芯與約束構(gòu)件間接觸力的公式以及接觸點(diǎn)之間的距離公式進(jìn)行了檢驗(yàn),以驗(yàn)證其在考慮約束構(gòu)件變形和加強(qiáng)段影響時(shí)其結(jié)論是否可用;最后,對(duì)約束構(gòu)件彎矩等結(jié)論進(jìn)行了檢驗(yàn)。在有限元分析之后,利用本文所介紹的五個(gè)試件的試驗(yàn)結(jié)果對(duì)波長(zhǎng)計(jì)算公式進(jìn)行了驗(yàn)證。在完成了對(duì)本文理論的檢驗(yàn)之后,對(duì)影響約束構(gòu)件彎矩與加強(qiáng)段彎矩的關(guān)鍵參數(shù)進(jìn)行了分析討論,并與已有的相關(guān)設(shè)計(jì)方法進(jìn)行了對(duì)比。
[Abstract]:Anti buckling support is a kind of support component which uses the yield of soft steel to consume seismic energy. It has the advantages of both common support and metal damper. Under small earthquakes, it can provide additional stiffness to the structure. Under large earthquakes, it can achieve full section yield and consume earthquake energy. The composition of anti buckling support is simple, mainly by energy dissipation inner core and inner core. The buckling constraint component is composed of two parts. But the buckling mechanism is more complex, because the overall and local stability of the buckling support is closely related not only to the stiffness, strength, and the initial defects of the inner core, but also to the elastic plastic deformation of the inner core, the inner core strengthening section, the gap and the friction between the inner core and the restrained member. The influence of force and so on, therefore the analysis and design method of buckling support has aroused wide interest of the relevant scholars. This paper mainly studies the buckling mechanism of the inner core of the anti buckling support and the design method of the supporting integral stability on this basis. The main contents and conclusions are as follows: (1) the concrete filled steel tube buckling restrained braces are carried out. The test of five specimens, including full scale section short test piece test, full scale test, anti buckling support combination test and waveform verification test after its structure improvement, introduced in detail the processing process of this type of buckling support, pointed out the problems needing attention during the production process, and found through the test. Errors that are easy to occur during processing are improved to make the support form to be applied to the test of waveform verification. The strain changes of the inner core during the loading are measured on the surface of the inner core. (2) the buckling mechanism of the inner core of the anti buckling support is studied, and a simplified analysis model of the buckling support is established. The model assumes that the constrained component is rigid and has no initial defects, and the inner core is a straight rod with no initial defects. Through the balance differential equation of the inner core and its boundary conditions, the inner core deflection curve and the indirect contact force of the inner core and the restraint member are obtained. In this paper, the critical force is given and the general law of its transformation to more contact points is further revealed. The expression of the distance between the contact points and the maximum contact force are given for the multi point contact state, and the calculation formula for the maximum bending moment of the restrained member is given. This is the first time that the research on the anti buckling support is based on the contact force and the contact force. The maximum bending moment of the constrained component is calculated directly by the wavelengths. After that, the derivation results of the consolidation support are given, and the finite element software is used to verify the wave change process and the contact force formula of the hinged and consolidated buckling support proposed in this chapter. Finally, the theory of the relative scholars' theory about the post yield modulus of the pressure bar will be used. The result of the analysis is extended to the plastic stage. Using the finite element model, the difference between the calculated results of the elastic modulus and the tangent modulus is compared with that of the simulated value. The suggestion of the value of the modulus of the inner core after yield is given. (3) an integral stability design method for flexion bracing with internal core buckling mode is proposed, which will simplify the anti flexion. The result of the analysis of the curved support extends to a more general case. The stiffness of the constrained component is introduced in the analysis, so the deformation of the constrained component is considered, and the influence of the inner core reinforcement is considered. The balance differential equation is listed for the inner core and the constrained component, and the inner core is obtained at the time of contact between the two and the two points. The deflection curve of the inner core and the constrained component is obtained and the maximum bending moment of the component is restrained and the maximum bending moment of the member is strengthened. The parametric analysis is carried out to verify the hypothesis that the slope of the core tangent of the inner core is zero and the bending moment is zero at the contact point at the contact point, and then the two points contact is divided by the stress characteristics of the multi point contact. In order to simplify the calculation process, a unified formula for calculating the maximum contact force, restricting components and strengthening the maximum bending moment of the section is proposed, and the design criteria of the restrained member and the reinforcement section are given. (4) a finite element model with end buckling support is set up, and the finite element model is established. In this model, the deformation of the constrained component is considered, and the conclusions derived in this paper are verified. In the finite element analysis, the development process of the inner core from one point contact to the multi point contact is tested first. Then, the formula of the indirect contact force between the inner core and the constrained component and the distance formula between the contact points are tested to verify that it is considered about about the contact point. In the end, the conclusion of the bending moment of the restrained member is tested. After the finite element analysis, the wavelength calculation formula is verified by the test results of the five specimens introduced in this paper. After the test of the theory of the present theory is completed, the bending moment and the bending moment of the constrained component are affected. The key parameters to enhance the bending moment are analyzed and discussed, and compared with the existing design methods.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU352.1
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本文編號(hào)：1813531