本文選題：螺栓節(jié)點 + 火災(zāi)　； 參考：《清華大學》2013年碩士論文

【摘要】：節(jié)點是結(jié)構(gòu)受力的關(guān)鍵部位，梁和柱的內(nèi)力通過節(jié)點傳遞，節(jié)點的破壞甚至可能引發(fā)結(jié)構(gòu)的連續(xù)性倒塌，因此分析節(jié)點真實受力行為對于考察結(jié)構(gòu)的安全性尤為重要。常溫下節(jié)點變形較小，承受的荷載組合相對簡單和固定，多考慮其承受剪力或彎矩作用的行為�；馂�(zāi)中節(jié)點的承載力隨著溫度的升高而降低，高溫下的大變形導(dǎo)致梁沿軸向產(chǎn)生懸鏈拉力作用。此時，一方面節(jié)點要有足夠的轉(zhuǎn)動能力以容納梁的變形，另一方面節(jié)點的受力狀態(tài)發(fā)生明顯改變，節(jié)點應(yīng)具有足夠的抗拉能力，否則會在拉剪共同作用下發(fā)生破壞。然而，目前國內(nèi)外有關(guān)節(jié)點高溫研究的內(nèi)容主要還是遵循節(jié)點常溫研究的思路，即通過試驗或有限元方法得到獨立節(jié)點的彎矩-轉(zhuǎn)角關(guān)系，對于火災(zāi)中節(jié)點的真實受力及節(jié)點與構(gòu)件間的相互作用缺少考慮。因此，有必要開展節(jié)點在拉、彎、剪綜合荷載作用下的真實火災(zāi)行為的研究。本文主要研究內(nèi)容包括： (1)采用自定義雙線性爐溫控制曲線，進行了端板式螺栓連接及腹板雙角鋼式螺栓連接兩種不同形式節(jié)點的火災(zāi)試驗，以端板厚度、火災(zāi)荷載組合為主要參數(shù)，研究了高溫下鋼結(jié)構(gòu)節(jié)點的溫度分布、破壞模態(tài)、承載力、變形及拉剪組合作用對節(jié)點承載力的影響等。 (2)建立了節(jié)點的三維實體分析模型，模型中考慮了材料非線性、節(jié)點大變形及節(jié)點各組件間的接觸關(guān)系對節(jié)點性能的影響。并采用試驗結(jié)果對有限元模型進行了驗證分析，結(jié)果表明有限元方法可以準確地模擬出節(jié)點受力及變形，同時可以方便地得到節(jié)點整個破壞過程。接著，通過大量的節(jié)點荷載組合參數(shù)分析，研究了節(jié)點在拉剪組合作用下的破壞機制及剪力對節(jié)點抗拉承載力的影響，得到了節(jié)點在拉剪組合作用下對應(yīng)不同極限溫度的相關(guān)破壞曲線。 (3)基于組件法建立了平齊式端板節(jié)點的簡化分析模型，并利用試驗及三維有限元分析的結(jié)果對模型進行驗證。所建立的模型通過螺栓抗拉強度的折減考慮了剪力對螺栓承載力的影響，因此可以方便地得到節(jié)點在同時承受拉、剪、彎的綜合荷載作用時的性能。通過一系列的參數(shù)分析，，進一步得到了剪力及拉力對節(jié)點火災(zāi)行為的影響，并為鋼結(jié)構(gòu)節(jié)點高溫設(shè)計提出設(shè)計建議。
[Abstract]:The internal force of beam and column is transmitted through the joint, and the destruction of the joint may even lead to the continuous collapse of the structure. Therefore, it is very important to analyze the real behavior of the joint in order to investigate the safety of the structure. At room temperature, the joint deformation is small, the load combination is relatively simple and fixed, and the behavior of the joint subjected to shear or bending moment is considered. The bearing capacity of the joints decreases with the increase of the temperature, and the large deformation at high temperature results in catenary tension along the axial direction of the beam. At this point, on the one hand, the joint should have enough rotation ability to accommodate the deformation of the beam, on the other hand, the stress state of the joint should be changed obviously, and the joint should have sufficient tensile capacity, otherwise, the joint would be destroyed under the joint action of tension and shear. However, at present, the contents of the research on the joint temperature at home and abroad mainly follow the train of thought of the research on the normal temperature of the joint, that is, the moment-rotation relationship of the independent joint is obtained by means of the experiment or the finite element method. There is a lack of consideration for the actual force of the joint and the interaction between the node and the component in the fire. Therefore, it is necessary to study the real fire behavior of joints under tension, bending and shear loads. The main contents of this paper are as follows: (1) using the self-defined bilinear furnace temperature control curve, the fire tests of end plate bolt connection and web double angle steel bolt connection are carried out, and the thickness of the end plate is taken as the thickness of the end plate. The influence of temperature distribution, failure mode, bearing capacity, deformation and tension shear combination on the joint bearing capacity of steel structure under high temperature is studied. In the model, the material nonlinearity, the large deformation of the joint and the contact relationship between the various components of the joint are considered to affect the performance of the joint. The finite element model is verified and analyzed by the experimental results. The results show that the finite element method can accurately simulate the stress and deformation of the joints and the whole failure process of the joints can be easily obtained. Then, through the analysis of a large number of joint load combination parameters, the failure mechanism of joints under the action of tension and shear combination and the influence of shear force on the tensile bearing capacity of joints are studied. The relative failure curves of joints corresponding to different limit temperatures are obtained. (3) based on the component method, a simplified analysis model of flat end plate joints is established, and the model is verified by the results of experiments and 3D finite element analysis. The model considers the effect of shear force on the bearing capacity of bolts by reducing the tensile strength of bolts, so it is convenient to obtain the performance of the joints under the combined loads of tension, shear and bending at the same time. Through a series of parameter analysis, the influence of shear force and tensile force on the joint fire behavior is further obtained, and the design suggestions for the high temperature design of steel structure joint are put forward.
【學位授予單位】：清華大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU352.5

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本文編號：1999864