帶BRB的高層鋼框架梁柱節(jié)點(diǎn)的受力性能研究
發(fā)布時(shí)間：2019-04-09 12:26
【摘要】：鋼結(jié)構(gòu)具有良好的力學(xué)性能、經(jīng)濟(jì)性能和使用性能,因而被廣泛地應(yīng)用在大型公共建筑、民用建筑、工業(yè)設(shè)備、廠房、橋梁等領(lǐng)域。隨著城市人口的日益密集,世界很多大城市的建筑逐步向高空發(fā)展。但是高層建筑由于其層數(shù)多的因素,結(jié)構(gòu)的受力十分復(fù)雜,除了承受本身極大的自重和使用荷載外,還有來自水平方向的風(fēng)荷載和地震荷載等側(cè)向作用,而后者在高層建筑結(jié)構(gòu)設(shè)計(jì)中占有很大的比重。鋼框架-支撐體系通過框架體系與支撐體系共同作用形成雙重抗側(cè)力結(jié)構(gòu)體系,能夠較好的抵抗側(cè)向荷載作用。傳統(tǒng)的框架-支撐結(jié)構(gòu)中支撐采用的是普通支撐,在承受較大軸壓力作用時(shí)支撐會發(fā)生屈曲變形,嚴(yán)重時(shí)可導(dǎo)致整體結(jié)構(gòu)發(fā)生失穩(wěn)破壞。鑒于此,一種外部具有約束機(jī)制的新型支撐被研制出來,即屈曲約束支撐,并且被廣泛地應(yīng)用,這種屈曲約束支撐的出現(xiàn)解決了普通支撐受壓屈曲的問題,由于支撐外部有約束構(gòu)件的約束作用,所以具有較高的承載力和抗震性能。1994年的美國加州北嶺地震和1995年的日本阪神地震發(fā)生后,調(diào)查鋼結(jié)構(gòu)的建筑物,發(fā)現(xiàn)破壞的地方均發(fā)生在梁柱節(jié)點(diǎn)區(qū)域,由此說明鋼框架中的梁柱節(jié)點(diǎn)作為整個結(jié)構(gòu)的核心部分,也是鋼結(jié)構(gòu)設(shè)計(jì)的關(guān)鍵因素之一,對其進(jìn)行理論探討和試驗(yàn)研究以及運(yùn)用有限元軟件進(jìn)行數(shù)值模擬分析是非常有必要的。 本文基于屈曲約束支撐的國內(nèi)外研究現(xiàn)狀以及屈曲約束支撐在高層鋼框架中的應(yīng)用,采用通用有限元軟件ABAQUS,依托于高層鋼框架算例設(shè)計(jì),選取算例中一帶屈曲約束支撐的梁柱節(jié)點(diǎn),研究屈曲約束支撐分別在循環(huán)荷載和單調(diào)荷載的作用下對高層鋼框架中梁柱節(jié)點(diǎn)的影響,在此基礎(chǔ)上去掉屈曲約束支撐外部約束構(gòu)件,使其成為普通支撐,在相同的荷載工況下對比研究普通支撐對梁柱節(jié)點(diǎn)的影響,以及兩種支撐自身的受力過程。通過模型的模擬和數(shù)值分析,再針對帶屈曲約束支撐的梁柱節(jié)點(diǎn),對屈曲約束支撐內(nèi)部構(gòu)件的屈服強(qiáng)度、內(nèi)芯的彈性模量、支撐與梁柱連接的節(jié)點(diǎn)板大小、節(jié)點(diǎn)板厚度、節(jié)點(diǎn)板上面外加勁肋的長度進(jìn)行參數(shù)分析,對比這些參數(shù)的變化對梁柱節(jié)點(diǎn)抗震性能和承載能力的影響。 研究表明：帶屈曲約束支撐的梁柱節(jié)點(diǎn)與帶普通支撐的梁柱節(jié)點(diǎn)相比有更好的承載力和抗震性能。針對帶屈曲約束支撐的梁柱節(jié)點(diǎn)：(1)隨著支撐內(nèi)芯屈服強(qiáng)度和彈性模量的升高,節(jié)點(diǎn)板尺寸和厚度的增大以及面外加勁肋長度的增加,梁柱節(jié)點(diǎn)的承載力隨之提高；(2)隨著支撐內(nèi)芯屈服強(qiáng)度和彈性模量的降低,節(jié)點(diǎn)板尺寸和厚度的增大以及面外加勁肋長度的增加,梁柱節(jié)點(diǎn)的滯回曲線更加飽滿,擁有更好的抗震性能。
[Abstract]:Steel structures are widely used in the fields of large-scale public buildings, civil buildings, industrial equipment, factory buildings, bridges and so on because of their good mechanical properties, economic performance and service performance. With the increasing density of urban population, the buildings of many large cities in the world are gradually developing to high altitude. However, because of the large number of stories in high-rise buildings, the force of the structure is very complex. In addition to bearing its own great self-weight and service load, it also has lateral effects such as wind load and earthquake load from the horizontal direction. The latter occupies a large proportion in the structural design of high-rise buildings. The steel frame-bracing system can resist the lateral load well through the joint action of the frame system and the bracing system to form the double resisting lateral force structure system. In the traditional frame-bracing structure, ordinary bracing is adopted. Under the action of large axial pressure, the bracing will take place buckling deformation, which can lead to the instability and failure of the whole structure when it is serious. In view of this, a new type of bracing with external constraint mechanism has been developed, that is, buckling-constrained bracing, and has been widely used. The emergence of this kind of buckling-constrained brace solves the problem of buckling of ordinary braces under compression. Because the external bracing is constrained by the constrained members, it has high bearing capacity and seismic performance. After the North Ridge earthquake in California in 1994 and the Hanshin earthquake in Japan in 1995, the steel structure buildings were investigated. The results show that the Liang Zhu joint in the steel frame is the core part of the whole structure and is also one of the key factors in the design of the steel structure. It is very necessary to carry on the theoretical discussion and the experimental research and to use the finite element software to carry on the numerical simulation analysis. Based on the research status of buckling-constrained braces at home and abroad and the application of buckling-constrained braces in high-rise steel frames, the general finite element software ABAQUS, is used to design the examples of high-rise steel frames. Liang Zhu joints with buckling-constrained braces are selected to study the influence of buckling-constrained braces on Liang Zhu joints in high-rise steel frames under cyclic load and monotonic load, respectively. On the basis of this, the external constrained members of buckling-constrained braces are removed and made ordinary braces. Under the same load conditions, the influence of common braces on Liang Zhu joints and the stress process of two kinds of braces themselves are comparatively studied. Through the simulation and numerical analysis of the model, the yield strength, elastic modulus of the inner core, the size of the nodal plate connected with Liang Zhu, and the thickness of the nodal plate for the Liang Zhu joint with buckling constraint bracing are analyzed, and the yield strength of the inner member, the elastic modulus of the inner core, and the thickness of the nodal plate are studied. The influence of these parameters on the seismic performance and bearing capacity of Liang Zhu joint is analyzed by analyzing the length of the external stiffener on the joint plate. The results show that Liang Zhu joints with buckling constraints have better bearing capacity and seismic performance than Liang Zhu joints with ordinary braces. For Liang Zhu joints with buckling constraints: (1) the bearing capacity of Liang Zhu joints increases with the increase of the yield strength and elastic modulus of the inner core, the increase of the size and thickness of the nodal plate, and the increase of the length of the external stiffener; (2) with the decrease of the yield strength and elastic modulus of the inner core, the increase of the size and thickness of the nodal plate and the increase of the length of the external stiffener, the hysteretic curve of the Liang Zhu joint is fuller and has better seismic performance.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU973.13
本文編號：2455183
[Abstract]:Steel structures are widely used in the fields of large-scale public buildings, civil buildings, industrial equipment, factory buildings, bridges and so on because of their good mechanical properties, economic performance and service performance. With the increasing density of urban population, the buildings of many large cities in the world are gradually developing to high altitude. However, because of the large number of stories in high-rise buildings, the force of the structure is very complex. In addition to bearing its own great self-weight and service load, it also has lateral effects such as wind load and earthquake load from the horizontal direction. The latter occupies a large proportion in the structural design of high-rise buildings. The steel frame-bracing system can resist the lateral load well through the joint action of the frame system and the bracing system to form the double resisting lateral force structure system. In the traditional frame-bracing structure, ordinary bracing is adopted. Under the action of large axial pressure, the bracing will take place buckling deformation, which can lead to the instability and failure of the whole structure when it is serious. In view of this, a new type of bracing with external constraint mechanism has been developed, that is, buckling-constrained bracing, and has been widely used. The emergence of this kind of buckling-constrained brace solves the problem of buckling of ordinary braces under compression. Because the external bracing is constrained by the constrained members, it has high bearing capacity and seismic performance. After the North Ridge earthquake in California in 1994 and the Hanshin earthquake in Japan in 1995, the steel structure buildings were investigated. The results show that the Liang Zhu joint in the steel frame is the core part of the whole structure and is also one of the key factors in the design of the steel structure. It is very necessary to carry on the theoretical discussion and the experimental research and to use the finite element software to carry on the numerical simulation analysis. Based on the research status of buckling-constrained braces at home and abroad and the application of buckling-constrained braces in high-rise steel frames, the general finite element software ABAQUS, is used to design the examples of high-rise steel frames. Liang Zhu joints with buckling-constrained braces are selected to study the influence of buckling-constrained braces on Liang Zhu joints in high-rise steel frames under cyclic load and monotonic load, respectively. On the basis of this, the external constrained members of buckling-constrained braces are removed and made ordinary braces. Under the same load conditions, the influence of common braces on Liang Zhu joints and the stress process of two kinds of braces themselves are comparatively studied. Through the simulation and numerical analysis of the model, the yield strength, elastic modulus of the inner core, the size of the nodal plate connected with Liang Zhu, and the thickness of the nodal plate for the Liang Zhu joint with buckling constraint bracing are analyzed, and the yield strength of the inner member, the elastic modulus of the inner core, and the thickness of the nodal plate are studied. The influence of these parameters on the seismic performance and bearing capacity of Liang Zhu joint is analyzed by analyzing the length of the external stiffener on the joint plate. The results show that Liang Zhu joints with buckling constraints have better bearing capacity and seismic performance than Liang Zhu joints with ordinary braces. For Liang Zhu joints with buckling constraints: (1) the bearing capacity of Liang Zhu joints increases with the increase of the yield strength and elastic modulus of the inner core, the increase of the size and thickness of the nodal plate, and the increase of the length of the external stiffener; (2) with the decrease of the yield strength and elastic modulus of the inner core, the increase of the size and thickness of the nodal plate and the increase of the length of the external stiffener, the hysteretic curve of the Liang Zhu joint is fuller and has better seismic performance.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU973.13
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