火災下鋼管混凝土柱—鋼梁穿筋節(jié)點受力性能分析
發(fā)布時間：2019-03-12 13:21
【摘要】：節(jié)點的抗火研究大部分集中在外加強環(huán)節(jié)點這類柱貫通式節(jié)點層面,而較少涉及到穿筋節(jié)點這類梁貫通式節(jié)點,因此本論文通過對標準升溫曲線作用下鋼管混凝土柱-鋼梁穿筋節(jié)點的耐火性能的數(shù)值模擬分析,為該節(jié)點抗火提供設(shè)計依據(jù)。首先,本文在確定恰當?shù)倪吔鐥l件、單元類型、材料熱物理性質(zhì)以及利用試驗驗證模型思路正確的基礎(chǔ)上,利用ABAQUS有限元軟件,對鋼管混凝土柱-鋼梁穿筋節(jié)點在升溫過程中的溫度場進行數(shù)值模擬,并對可能影響溫度場的參數(shù)進行了分析,為節(jié)點耐火分析提供溫度荷載施加的依據(jù)。得到如下結(jié)論：(1)根據(jù)溫度場分布規(guī)律可知,溫度分布不均勻,除節(jié)點核心區(qū)混凝土的溫度因為穿筋的作用溫度高于非節(jié)點區(qū)域外,整體節(jié)點核心區(qū)溫度要低于非節(jié)點區(qū)溫度。(2)鋼筋的存在可以增強節(jié)點在火災下的升溫程度,但是直徑的大小對溫度場的影響不是很明顯。(3)鋼梁截面寬度對節(jié)點在火災下的升溫情況幾乎無影響。(4)防火保護層對于節(jié)點在火災下的升溫情況影響顯著。防火保護層的存在降低了節(jié)點的升溫程度,且隨著防火保護層厚度的增加而越發(fā)明顯。其次,本文在利用試驗驗證模型思路正確的基礎(chǔ)上,利用ABAQUS有限元軟件,設(shè)計了7個常溫下承受往復荷載的方鋼管混凝土柱-鋼梁穿筋節(jié)點模型,得到相應極限承載力值的同時并對其進行了參數(shù)分析,為節(jié)點耐火分析提供靜力荷載施加的依據(jù)。最后,本文在利用試驗驗證模型思路正確的基礎(chǔ)上,利用ABAQUS有限元軟件設(shè)計了3個鋼管混凝土柱和7個方鋼管混凝土柱-鋼梁穿筋節(jié)點耐火計算模型,得到相應耐火極限的同時并對該類節(jié)點的耐火性能進行了分析。得出以下結(jié)論：(1)增大荷載比可降低節(jié)點的耐火極限和臨界溫度。降低荷載比可提高節(jié)點的耐火極限和臨界溫度。(2)增大軸壓比可降低節(jié)點的耐火極限和臨界溫度。降低軸壓比可提高節(jié)點的耐火極限和臨界溫度。(3)鋼筋的強度對節(jié)點的耐火極限幾乎無影響。(4)提高含鋼率可提高節(jié)點的耐火極限和臨界溫度。降低含鋼率可降低節(jié)點的耐火極限和臨界溫度。(5) 防火層的存在可提高節(jié)點的耐火極限和臨界溫度。
[Abstract]:Most of the research on fire resistance of joint is focused on the layer of column-through-type joint such as the strengthened ring node, but rarely involves the beam-through-type joint such as the piercing joint. In this paper, the fire resistance of the concrete-filled steel tubular column-steel beam piercing joint under the action of the standard heating curve is simulated and analyzed, which provides the design basis for the fire resistance of the joint. Firstly, on the basis of determining the appropriate boundary conditions, element types, material thermophysical properties and using the test to verify the model, the ABAQUS finite element software is used in this paper. The temperature field of the concrete-filled steel tubular (CFST) column-steel beam pierced joint during the heating process is numerically simulated, and the parameters which may affect the temperature field are analyzed, which provides the basis for the fire resistance analysis of the joint. The results are as follows: (1) according to the distribution of temperature field, the temperature distribution is not uniform, except that the temperature of the concrete in the core zone of the joint is higher than that of the non-node region because of the action of the reinforcement. The temperature in the core zone of the whole joint is lower than that in the non-node zone. (2) the existence of steel bars can enhance the warming degree of the joint in the event of fire. However, the influence of the diameter on the temperature field is not obvious. (3) the width of the steel beam has little effect on the temperature rise of the joints under fire. (4) the fire protection layer has a significant effect on the temperature rise of the joints under fire. The existence of the fire protection layer reduces the temperature rise of the joint and becomes more and more obvious with the increase of the thickness of the fire protection layer. Secondly, seven concrete-filled square steel tubular columns and steel beams with reciprocating load under normal temperature are designed by using ABAQUS finite element software, on the basis of the correct thinking of the model, which is verified by the experiment, and the finite element software ABAQUS is used to design seven concrete-filled square steel tubular columns-steel beams. At the same time, the corresponding ultimate load value is obtained and the parameter analysis is carried out, which provides the basis for the static load applied to the fire resistance analysis of the joints. Finally, on the basis of the correctness of the model, three concrete-filled steel tube columns and seven concrete-filled square steel tubular columns-steel beams are designed by using ABAQUS finite element software, and the fire resistance calculation models of concrete-filled steel tubular columns-steel beams are designed in this paper. At the same time, the fire resistance performance of this kind of joints is analyzed. The conclusions are as follows: (1) increasing the load ratio can reduce the fire resistance limit and critical temperature of the joints. Reducing the load ratio can increase the fire resistance limit and critical temperature of the joint. (2) increasing the axial compression ratio can reduce the fire resistance limit and critical temperature of the joint. Reducing the axial compression ratio can increase the fire resistance limit and critical temperature of the joint. (3) the strength of the steel bar has little effect on the fire resistance limit of the joint. (4) increasing the steel content can increase the fire resistance limit and critical temperature of the joint. The fire resistance limit and critical temperature of the joint can be reduced by reducing the steel content. (5) the fire resistance limit and critical temperature of the joint can be increased by the existence of fire-proof layer.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU398.9
本文編號：2438819
[Abstract]:Most of the research on fire resistance of joint is focused on the layer of column-through-type joint such as the strengthened ring node, but rarely involves the beam-through-type joint such as the piercing joint. In this paper, the fire resistance of the concrete-filled steel tubular column-steel beam piercing joint under the action of the standard heating curve is simulated and analyzed, which provides the design basis for the fire resistance of the joint. Firstly, on the basis of determining the appropriate boundary conditions, element types, material thermophysical properties and using the test to verify the model, the ABAQUS finite element software is used in this paper. The temperature field of the concrete-filled steel tubular (CFST) column-steel beam pierced joint during the heating process is numerically simulated, and the parameters which may affect the temperature field are analyzed, which provides the basis for the fire resistance analysis of the joint. The results are as follows: (1) according to the distribution of temperature field, the temperature distribution is not uniform, except that the temperature of the concrete in the core zone of the joint is higher than that of the non-node region because of the action of the reinforcement. The temperature in the core zone of the whole joint is lower than that in the non-node zone. (2) the existence of steel bars can enhance the warming degree of the joint in the event of fire. However, the influence of the diameter on the temperature field is not obvious. (3) the width of the steel beam has little effect on the temperature rise of the joints under fire. (4) the fire protection layer has a significant effect on the temperature rise of the joints under fire. The existence of the fire protection layer reduces the temperature rise of the joint and becomes more and more obvious with the increase of the thickness of the fire protection layer. Secondly, seven concrete-filled square steel tubular columns and steel beams with reciprocating load under normal temperature are designed by using ABAQUS finite element software, on the basis of the correct thinking of the model, which is verified by the experiment, and the finite element software ABAQUS is used to design seven concrete-filled square steel tubular columns-steel beams. At the same time, the corresponding ultimate load value is obtained and the parameter analysis is carried out, which provides the basis for the static load applied to the fire resistance analysis of the joints. Finally, on the basis of the correctness of the model, three concrete-filled steel tube columns and seven concrete-filled square steel tubular columns-steel beams are designed by using ABAQUS finite element software, and the fire resistance calculation models of concrete-filled steel tubular columns-steel beams are designed in this paper. At the same time, the fire resistance performance of this kind of joints is analyzed. The conclusions are as follows: (1) increasing the load ratio can reduce the fire resistance limit and critical temperature of the joints. Reducing the load ratio can increase the fire resistance limit and critical temperature of the joint. (2) increasing the axial compression ratio can reduce the fire resistance limit and critical temperature of the joint. Reducing the axial compression ratio can increase the fire resistance limit and critical temperature of the joint. (3) the strength of the steel bar has little effect on the fire resistance limit of the joint. (4) increasing the steel content can increase the fire resistance limit and critical temperature of the joint. The fire resistance limit and critical temperature of the joint can be reduced by reducing the steel content. (5) the fire resistance limit and critical temperature of the joint can be increased by the existence of fire-proof layer.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU398.9
【參考文獻】
相關(guān)期刊論文 前10條
1 肖會霞;王景玄;王文達;;三面受火的方鋼管混凝土柱火災全過程力學性能分析[J];防災減災工程學報;2015年01期
2 周侃;韓林海;宋天詣;;鋼管混凝土柱-RC梁平面框架耐火性能分析[J];工程力學;2014年S1期
3 丁發(fā)興;周政;王海波;余志武;李巍;粟慧林;;局部火災下多層鋼-混凝土組合平面框架抗火性能分析[J];建筑結(jié)構(gòu)學報;2014年06期
4 王景玄;王文達;;不同火災工況下鋼梁-鋼管混凝土柱平面框架受火全過程分析[J];建筑結(jié)構(gòu)學報;2014年03期
5 王鐵成;張磊;趙海龍;杜闖;;鋼管混凝土柱抗震性能參數(shù)影響分析[J];建筑結(jié)構(gòu)學報;2013年S1期
6 史艷莉;黃秋秋;王文達;;方鋼管混凝土柱-翼緣削弱型鋼梁內(nèi)隔板節(jié)點力學性能研究[J];工程抗震與加固改造;2013年03期
7 呂學濤;楊華;張素梅;;非均勻火災作用下方鋼管混凝土柱受力機理研究[J];建筑結(jié)構(gòu)學報;2013年03期
8 王廣勇;劉廣偉;劉曉陽;;方鋼管混凝土柱-鋼梁平面框架耐火性能研究[J];防災減災工程學報;2012年S1期
9 楊華;劉發(fā)起;呂學濤;張素梅;;三面受火的矩形鋼管混凝土柱受力機理與耐火極限[J];建筑鋼結(jié)構(gòu)進展;2011年06期
10 史艷莉;謝娜;王文達;張鵬鵬;;鋼管混凝土柱-鋼梁環(huán)板節(jié)點抗剪性能數(shù)值模擬[J];土木工程與管理學報;2011年03期
相關(guān)博士學位論文 前5條
1 劉士潤;低周反復荷載作用下穿透式鋼管混凝土節(jié)點力學性能研究[D];大連理工大學;2011年
2 呂學濤;非均勻受火的方鋼管混凝土柱抗火性能與設(shè)計[D];哈爾濱工業(yè)大學;2010年
3 何文輝;方鋼管混凝土柱—鋼梁組合框架抗震性能研究[D];湖南大學;2009年
4 王銀志;考慮結(jié)構(gòu)整體性的組合梁抗火性能研究[D];同濟大學;2006年
5 霍靜思;火災作用后鋼管混凝土柱—鋼梁節(jié)點力學性能研究[D];福州大學;2005年
相關(guān)碩士學位論文 前2條
1 王傳奇;薄壁型鋼—混凝土梁—柱節(jié)點抗火性能研究[D];華僑大學;2009年
2 江瑩;火災后方鋼管混凝土柱—鋼梁連接節(jié)點的力學性能分析[D];清華大學;2008年
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