受火淺圓鋼拱的行為模擬及參數(shù)分析
發(fā)布時(shí)間：2018-10-20 07:45
【摘要】：當(dāng)今社會(huì)飛速發(fā)展,應(yīng)用于現(xiàn)代建筑中的大跨度鋼結(jié)構(gòu)樣式越來(lái)越多,鋼拱結(jié)構(gòu)便是其中一類,此類型具有受力合理、變形小以及適合在大跨度結(jié)構(gòu)中應(yīng)用等優(yōu)點(diǎn),使其在工程中得到廣泛的應(yīng)用。但由于鋼材本身的抗火性能較差,致使鋼拱結(jié)構(gòu)整體也不具備較強(qiáng)的抗火性能。鋼拱在火災(zāi)下經(jīng)常發(fā)生嚴(yán)重的平面內(nèi)失穩(wěn),甚至出現(xiàn)平面外失穩(wěn)破壞,因此鋼拱的受火問(wèn)題受到社會(huì)各界廣泛關(guān)注。鋼拱結(jié)構(gòu)在火災(zāi)下的行為與梁、柱等構(gòu)件在火災(zāi)下的受力性能存在本質(zhì)區(qū)別,鋼拱作為結(jié)構(gòu)中非常重要的受力構(gòu)件,進(jìn)行火災(zāi)下鋼拱的性能研究具有非常重要的現(xiàn)實(shí)意義。本文運(yùn)用有限元軟件對(duì)淺圓鋼拱行為進(jìn)行受火分析時(shí),其中受火淺圓鋼拱會(huì)發(fā)生平面外失穩(wěn)和平面內(nèi)失穩(wěn)兩種形式;其第一種是面外對(duì)鋼拱結(jié)構(gòu)的支撐剛度不夠,發(fā)生時(shí)不僅存在面內(nèi)的彎矩、軸力,還有側(cè)向位移、扭矩以及翹曲應(yīng)力,第二種是面外支撐足夠的淺圓鋼拱進(jìn)行抗火研究時(shí),其支座約束鋼度用彈簧單元模擬,得出受火淺圓鋼拱仍然會(huì)發(fā)生平面內(nèi)跳躍失穩(wěn)現(xiàn)象,而且在火災(zāi)下的行為發(fā)展過(guò)程分為三個(gè)階段:軸壓力增大階段,軸壓力減小階段,跳躍階段,還有一個(gè)特別重要的溫度,即臨界跳躍失穩(wěn)溫度,能夠形象的反映火災(zāi)下淺圓鋼拱平面內(nèi)失穩(wěn)特點(diǎn)。無(wú)論是面內(nèi)還是面外失穩(wěn)問(wèn)題,淺圓鋼拱都具有很好的潛在研究?jī)r(jià)值。本文將著重模擬平面內(nèi)的淺圓鋼拱行為發(fā)展過(guò)程,繼而全面研究各個(gè)參數(shù)對(duì)火災(zāi)下淺圓鋼拱行為的影響�？紤]到以上幾方面,本文的主要研究?jī)?nèi)容分為以下幾個(gè)方面:(1)參考?xì)W洲規(guī)范加以驗(yàn)證有限元的準(zhǔn)確性并且運(yùn)用有限元對(duì)受火淺圓鋼拱進(jìn)行不同單元類型、不同分析步模擬以及筒殼結(jié)構(gòu)的模擬得出相應(yīng)的結(jié)論。(2)基于有限元ABAQUS,對(duì)受火淺圓鋼拱進(jìn)行火災(zāi)下全過(guò)程響應(yīng)及參數(shù)分析,得出火災(zāi)下淺圓鋼拱仍然會(huì)發(fā)生面內(nèi)跳躍失穩(wěn)現(xiàn)象;同時(shí)分析載荷比、矢跨比(矢高和跨度)、長(zhǎng)細(xì)比、屈服強(qiáng)度、荷載作用形式、拱軸截面尺寸等參數(shù)對(duì)其行為發(fā)展全過(guò)程的影響。通過(guò)以上分析,可以得出:不同條件下,受火淺圓鋼拱的撓度和內(nèi)力差異較大,載荷比和矢跨比、長(zhǎng)細(xì)比對(duì)撓度及內(nèi)力曲線具有較大的影響。
[Abstract]:Nowadays, with the rapid development of society, more and more large-span steel structures are used in modern buildings. The steel arch structure is one of them, which has the advantages of reasonable force, small deformation and suitable for application in long-span structures. It is widely used in engineering. However, due to the poor fire resistance of the steel itself, the steel arch structure as a whole does not have strong fire resistance. Steel arch often occurs serious instability in the plane under fire, even out of the plane instability, so the fire of steel arch has been widely concerned by all walks of life. The behavior of steel arch structure under fire is essentially different from that of beam column and other members under fire. As a very important component of structure steel arch is of great practical significance to study the behavior of steel arch under fire. In this paper, when the behavior of shallow round steel arch is analyzed by finite element software, there are two forms of out-of-plane instability and in-plane instability of shallow round arch, the first is that the out-of-plane support stiffness of steel arch is not enough. There are not only in-plane bending moment, axial force, lateral displacement, torque and warping stress. The second is that the bearing restrained steel degree is simulated by spring element when the shallow round arch with enough out-of-plane support is used to study the fire resistance. It is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch subjected to fire, and the behavior development process under fire can be divided into three stages: the stage of increasing axial pressure, the stage of decreasing axial pressure, the stage of jumping, and a particularly important temperature. That is the critical jump instability temperature, which can reflect the plane instability characteristics of shallow round arch under fire. In-plane and out-of-plane instability, shallow round arch has good potential research value. In this paper, the development process of shallow round arch behavior in plane is simulated, and the influence of various parameters on the behavior of shallow round steel arch under fire is studied. Considering the above aspects, the main research contents of this paper are as follows: (1) the accuracy of the finite element is verified by referring to the European Code and the different element types of the fire shallow round arch are carried out by using the finite element method. The corresponding conclusions are obtained by simulation of different analysis steps and shell structure. (2) based on finite element analysis (ABAQUS,), the whole process response and parameter analysis of shallow round arch under fire are carried out, and it is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch under fire; At the same time, the effects of load ratio, rise-span ratio (sagittal height and span), aspect ratio, yield strength, form of load action and section size of arch axis on the whole process of its behavior development are analyzed. Through the above analysis, it can be concluded that under different conditions, the deflection and internal force of shallow round arch are different greatly, the ratio of load to span, aspect ratio and aspect ratio have great influence on deflection and internal force curve.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391
本文編號(hào)：2282504
[Abstract]:Nowadays, with the rapid development of society, more and more large-span steel structures are used in modern buildings. The steel arch structure is one of them, which has the advantages of reasonable force, small deformation and suitable for application in long-span structures. It is widely used in engineering. However, due to the poor fire resistance of the steel itself, the steel arch structure as a whole does not have strong fire resistance. Steel arch often occurs serious instability in the plane under fire, even out of the plane instability, so the fire of steel arch has been widely concerned by all walks of life. The behavior of steel arch structure under fire is essentially different from that of beam column and other members under fire. As a very important component of structure steel arch is of great practical significance to study the behavior of steel arch under fire. In this paper, when the behavior of shallow round steel arch is analyzed by finite element software, there are two forms of out-of-plane instability and in-plane instability of shallow round arch, the first is that the out-of-plane support stiffness of steel arch is not enough. There are not only in-plane bending moment, axial force, lateral displacement, torque and warping stress. The second is that the bearing restrained steel degree is simulated by spring element when the shallow round arch with enough out-of-plane support is used to study the fire resistance. It is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch subjected to fire, and the behavior development process under fire can be divided into three stages: the stage of increasing axial pressure, the stage of decreasing axial pressure, the stage of jumping, and a particularly important temperature. That is the critical jump instability temperature, which can reflect the plane instability characteristics of shallow round arch under fire. In-plane and out-of-plane instability, shallow round arch has good potential research value. In this paper, the development process of shallow round arch behavior in plane is simulated, and the influence of various parameters on the behavior of shallow round steel arch under fire is studied. Considering the above aspects, the main research contents of this paper are as follows: (1) the accuracy of the finite element is verified by referring to the European Code and the different element types of the fire shallow round arch are carried out by using the finite element method. The corresponding conclusions are obtained by simulation of different analysis steps and shell structure. (2) based on finite element analysis (ABAQUS,), the whole process response and parameter analysis of shallow round arch under fire are carried out, and it is concluded that the phenomenon of in-plane jump instability will still occur in shallow round arch under fire; At the same time, the effects of load ratio, rise-span ratio (sagittal height and span), aspect ratio, yield strength, form of load action and section size of arch axis on the whole process of its behavior development are analyzed. Through the above analysis, it can be concluded that under different conditions, the deflection and internal force of shallow round arch are different greatly, the ratio of load to span, aspect ratio and aspect ratio have great influence on deflection and internal force curve.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU391
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