發(fā)布時間：2018-07-06 18:37

  本文選題：自復(fù)位防屈曲支撐 + 滯回耗能能力　； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：防屈曲支撐具有良好的抗震性能,但都是通過自身的強度和剛度來抵抗地震作用,這會導(dǎo)致其屈服后不能自動回到初始位置,產(chǎn)生較大的殘余變形。而基于位移的抗震設(shè)計是要求主要結(jié)構(gòu)構(gòu)件在預(yù)期地震作用下的位移在一定限值以內(nèi),以保證結(jié)構(gòu)的安全或可修復(fù)狀態(tài)。因此研發(fā)出一種既能耗散地震能量,又能減小殘余變形的自復(fù)位防屈曲支撐具有十分重要的現(xiàn)實意義。本文主要針對于所研發(fā)的新型全鋼自復(fù)位防屈曲支撐,通過試驗研究和有限元模擬的方法對其性能進行了研究;并總結(jié)和提出了新型全鋼自復(fù)位防屈曲支撐的初步設(shè)計方法,給出了算例驗證。本文的主要研究內(nèi)容和結(jié)論如下:首先研發(fā)了新型全鋼自復(fù)位防屈曲支撐裝置,并進行了低周往復(fù)試驗研究。根據(jù)自復(fù)位防屈曲支撐構(gòu)造組成和工作原理,研發(fā)了新型全鋼自復(fù)位防屈曲支撐裝置,且設(shè)計、加工、制作了該支撐裝置。通過擬靜力試驗研究該支撐的滯回耗能性能和復(fù)位性能。結(jié)果表明:該支撐構(gòu)造形式合理,具有優(yōu)良的復(fù)位能力,但滯回耗能性能稍弱;能很好的解決自復(fù)位防屈曲支撐端部構(gòu)造復(fù)雜等問題;全鋼自復(fù)位防屈曲支撐進行了有限元建模與分析�；贏BAQUS軟件分析各個部件的受力狀況與工作原理,并將模擬結(jié)果與試驗結(jié)果進行對比,探討采用數(shù)值模擬方法對該支撐工作性能進行分析研究的可行性。結(jié)果表明:支撐的各個部件設(shè)置合理;有限元模擬結(jié)果與試驗結(jié)果的滯回曲線吻合程度比較好,能量耗散系數(shù)和拉壓不均勻系數(shù)的差值很小,表明可以采用有限元模擬的方法對全鋼自復(fù)位防屈曲支撐的性能進行分析;研究分析了全鋼自復(fù)位防屈曲支撐的主要性能影響因素。影響因素包括傳力鋼板厚度、復(fù)位筋面積、初始預(yù)應(yīng)力的大小和復(fù)位筋材料。結(jié)果表明:必須控制傳力鋼板的厚度,防止其出現(xiàn)塑性變形;復(fù)位筋面積的增大會削弱支撐的耗能性能,而對復(fù)位能力影響不大;增大初始預(yù)應(yīng)力,支撐的耗能能力有一定程度的削弱,其復(fù)位能力有較大的提高,但在實際工程中復(fù)位筋建議設(shè)置為低初始預(yù)應(yīng)力,設(shè)定原則為“當(dāng)耗能內(nèi)芯屈服時,‘復(fù)位力’等于耗能內(nèi)芯的屈服承載力,即可實現(xiàn)自復(fù)位功能”;選用形狀記憶合金作為復(fù)位筋,將會增大支撐耗能能力,而對復(fù)位能力影響很小;總結(jié)和提出了全鋼自復(fù)位防屈曲支撐的初步設(shè)計方法。結(jié)合國內(nèi)外學(xué)者相關(guān)的研究,并通過全鋼自復(fù)位防屈曲支撐的試驗研究和有限元模擬,總結(jié)和提出了全鋼自復(fù)位防屈曲支撐的初步設(shè)計方法,包含以下幾個方面:防屈曲支撐、自復(fù)位系統(tǒng)、支撐的承載力和過渡與連接段的設(shè)計方法。并給出了設(shè)計算例,為全鋼自復(fù)位防屈曲支撐的設(shè)計和應(yīng)用提供一定的參考。
[Abstract]:Buckling braces have good seismic performance, but all of them resist seismic action through their own strength and stiffness, which will lead to their failure to return to the initial position automatically after yielding, resulting in large residual deformation. The displacement-based seismic design requires the displacement of the main structural members under the expected earthquake to be within a certain limit to ensure the safety or repairable state of the structure. Therefore, it is of great practical significance to develop a self-reset anti-buckling bracing which not only dissipates seismic energy but also reduces residual deformation. In this paper, the performance of a new type of steel self-reset anti-buckling brace is studied by means of experimental research and finite element simulation, and the preliminary design method of the new-type full-steel self-reset anti-buckling bracing is summarized and put forward. A numerical example is given. The main contents and conclusions of this paper are as follows: firstly, a new type of all steel self-reset anti-buckling brace is developed, and the low cycle reciprocating test is carried out. According to the composition and working principle of self-reset anti-buckling bracing, a new self-reset anti-buckling bracing device of all steel was developed, and the device was designed, machined and manufactured. The hysteretic energy dissipation and reset performance of the support were studied by pseudostatic test. The results show that the structure is reasonable and has excellent reset ability, but the hysteretic energy dissipation performance is slightly weak, and it can solve the complex problems of self-reset anti-buckling support end structure and so on. All steel self-reset buckling braces are modeled and analyzed by finite element method. Based on Abaqus software, the mechanical condition and working principle of each component are analyzed, and the simulation results are compared with the experimental results, and the feasibility of using numerical simulation method to analyze and study the working performance of the support is discussed. The results show that the components of the support are reasonably set, the results of finite element simulation are in good agreement with the experimental results, and the difference between the energy dissipation coefficient and the non-uniform coefficient of tension and compression is very small. It is shown that the finite element simulation method can be used to analyze the performance of self-reset anti-buckling braces of all steel, and the main factors affecting the performance of self-reset anti-buckling brace of all steel are analyzed. The influencing factors include the thickness of the steel plate, the area of the steel bar, the size of the initial prestress and the material of the steel bar. The results show that the thickness of the load transfer plate must be controlled to prevent plastic deformation, the increase of the area of the reposition bar will weaken the energy dissipation performance of the braces, but has little effect on the reset ability, and the initial prestress will be increased. The energy dissipation ability of braces is weakened to a certain extent, and its reset ability is greatly improved. However, in practical engineering, it is suggested that the reinforcements should be set as low initial prestress, and the principle is "when the energy dissipation cores yield," The "reset force" is equal to the yield bearing capacity of the inner core of energy dissipation, which can realize the function of self-reset. "using shape memory alloy as the reposition bar will increase the energy dissipation ability of the support, but has little effect on the reset ability. The primary design method of all steel self-reset anti-buckling braces is summarized and put forward. Combined with the research of scholars at home and abroad, and through the experimental research and finite element simulation of all steel self-reset buckling braces, the preliminary design method of full-steel self-reset buckling braces is summarized and put forward, which includes the following aspects: Anti-buckling braces, Self-reset system, bearing capacity of brace and design method of transition and connection section. A design example is given, which provides a reference for the design and application of all steel self-reset buckling braces.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391;TU352.11

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