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  本文關(guān)鍵詞： LP鋼板 防屈曲支撐 消能減震 疲勞性能 最大接觸力　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：防屈曲支撐自提出以來便受到了國內(nèi)外大量研究學(xué)者的廣泛關(guān)注。傳統(tǒng)的一字內(nèi)芯防屈曲支撐,其耗能內(nèi)芯通常由加強(qiáng)段、過渡段和屈曲段三部分組成。為了保證內(nèi)芯屈曲段能夠進(jìn)入全截面屈服,通常在內(nèi)芯加強(qiáng)段和過渡段焊接加勁肋以此來保證對內(nèi)芯端部的約束。但是,焊接加勁肋不可避免的對內(nèi)芯的疲勞性能產(chǎn)生不利影響,使得防屈曲支撐在焊縫處發(fā)生斷裂。同時焊接的加勁肋也會引起耗能內(nèi)芯的剛度突變,導(dǎo)致在此處產(chǎn)生應(yīng)力集中,使得耗能內(nèi)芯在此處出現(xiàn)局部的破壞。本文提出一種基于LP鋼板(縱向變厚度鋼板)的新型一字內(nèi)芯防屈曲支撐。該支撐采用LP鋼板作為其內(nèi)芯構(gòu)件。此種LP鋼板一字內(nèi)芯防屈曲支撐與普通支撐相比其主要優(yōu)點(diǎn)在于它避免了在內(nèi)芯屈曲段及其附近甚至在整個內(nèi)芯上進(jìn)行焊接,從而減小甚至消除了殘余焊接應(yīng)力對防屈曲支撐疲勞性能的不利影響。同時,此類新型防屈曲支撐還可以簡化防屈曲支撐的制作加工工藝,且并不明顯提高造價。針對此種LP鋼板一字內(nèi)芯防屈曲支撐,本文研究內(nèi)容及相關(guān)成果如下:(1)提出了LP鋼板防屈曲支撐內(nèi)芯的構(gòu)造設(shè)計方法,確定出其設(shè)計時應(yīng)考慮的重要的控制參數(shù)。通過ABAQUS有限元軟件分析了多組防屈曲支撐的力學(xué)性能,并通過仿真分析結(jié)果確定關(guān)鍵參數(shù)的取值范圍;(2)對新型LP鋼板內(nèi)芯防屈曲支撐的局部穩(wěn)定性能進(jìn)行了分析,通過數(shù)值模擬確定了LP鋼板防屈曲支撐內(nèi)芯最小屈曲波長選取系數(shù)與寬厚比之間的函數(shù)關(guān)系,并發(fā)現(xiàn)當(dāng)耗能內(nèi)芯的寬厚比小于7時,研究了需要考慮耗能內(nèi)芯兩個方向屈曲的內(nèi)芯寬厚比限值�；谝陨辖Y(jié)果,研究了LP鋼板內(nèi)芯局部穩(wěn)定性設(shè)計方法。(3)設(shè)計了兩種不同構(gòu)造形式的足尺LP鋼板一字內(nèi)芯防屈曲支撐,并首次對這種新型防屈曲支撐進(jìn)行擬靜力試驗研究。擬靜力試驗研究結(jié)果表明,兩種防屈曲支撐彈性階段的力學(xué)性能與設(shè)計值十分接近,彈塑性階段的滯回曲線飽滿、穩(wěn)定,有較好的耗能能力。試驗結(jié)果驗證了本文所提的基于LP鋼板一字內(nèi)芯防屈曲支撐用于實際工程是可行性�；谝陨显囼炑芯拷Y(jié)果,本文還并給出了端部加勁肋和內(nèi)芯構(gòu)件變寬度部位的設(shè)計建議。
[Abstract]:Since it was put forward, anti-buckling braces have attracted extensive attention from a large number of researchers at home and abroad. In order to ensure that the inner core buckling section can enter the full section yield, the stiffening rib is usually welded in the inner core strengthening section and the transition section to ensure the inner core end restraint. However, in order to ensure that the inner core buckling section can enter the full section yield, the transition section and the buckling section are composed of three parts. Welding stiffeners inevitably have a negative effect on the fatigue properties of the inner core, which makes the buckle-proof bracing break at the weld seam. At the same time, the welded stiffeners will also cause the sudden change of the stiffness of the energy-dissipation inner core, which will lead to stress concentration here. In this paper, a new type of inner core buckling bracing based on LP steel plate (longitudinal variable thickness plate) is proposed. LP steel plate is used as the inner core member of the bracing. This type of LP steel is used as the core member. The main advantage of plate inner core buckling bracing compared with common bracing is that it avoids welding in and around the inner core buckling section and even on the whole inner core. Thus, the negative effect of residual welding stress on the fatigue properties of buckling braces is reduced or even eliminated. Meanwhile, this new type of anti-buckling brace can also simplify the manufacturing process of buckle-resistant braces. In view of this kind of LP steel plate inner core anti-buckling support, the research contents and related results are as follows: 1) the structural design method of LP steel plate anti-buckling bracing inner core is put forward. The important control parameters that should be considered in the design are determined. The mechanical properties of multi-group buckling braces are analyzed by ABAQUS finite element software. The local stability of the new type LP steel plate inner core anti-buckling braces is analyzed through the simulation analysis results to determine the value range of the key parameters. Through the numerical simulation, the function relationship between the minimum buckling wavelength selection coefficient and the ratio of width to thickness of the inner core of buckle-resistant bracing of LP steel plate is determined, and it is found that when the ratio of width to thickness of the inner core of energy dissipation is less than 7:00, Based on the above results, the width to thickness ratio of the inner core, which needs to be considered in both directions of buckling of the inner core, is studied. This paper studies the design method of local stability of inner core of LP steel plate. The pseudostatic test results show that the mechanical properties of the two kinds of anti-buckling braces are very close to the designed values, and the hysteretic curves of the elastic-plastic stage are full and stable. The experimental results verify the feasibility of the inner core buckling bracing based on LP steel plate proposed in this paper for practical engineering. Based on the above experimental results, The design suggestions of the end stiffening rib and the variable width part of the inner core member are also given in this paper.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU352.11

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本文編號：1543463