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  本文選題：啞鈴形　切入點：鋼管混凝土　出處：《福建農(nóng)林大學》2017年碩士論文

【摘要】：啞鈴形鋼管混凝土拱肋在工程實踐中得到大量運用,啞鈴形鋼管混凝土拱肋拱橋占鋼管混凝土拱橋比例高達四成之多。因而,對啞鈴形鋼管混凝土的力學性能進行深入的研究具有重要的工程意義。目前,與啞鈴形截面鋼管混凝土構(gòu)件相關(guān)的試驗研究相對較少,已進行的有啞鈴形鋼管混凝土軸壓、純彎、偏壓試驗,關(guān)于啞鈴形截面鋼管混凝土構(gòu)件的壓彎試驗還未開展。另外,關(guān)于鋼管混凝土的研究多集中在極限承載力方面,剛度方面的研究較少。在工程設(shè)計方面,除了對構(gòu)件進行承載能力極限狀態(tài)設(shè)計外,還需進行正常使用極限狀態(tài)設(shè)計。因此,啞鈴形鋼管混凝土在壓彎狀態(tài)下外部荷加對剛度承載力影響的研究顯得尤為迫切。本文通過試驗,研究和分析壓彎復合作用下不同軸壓比對啞鈴形鋼管混凝土抗彎承載力和抗彎剛度兩個方面影響,具體工作如下:(1)綜述整理國內(nèi)外圓(方)鋼管混凝土抗彎剛度和壓彎承載力相關(guān)曲線相關(guān)試驗和理論研究現(xiàn)狀;(2)結(jié)合現(xiàn)有試驗資料和條件,進行壓彎試驗方案設(shè)計,進行4根不同軸壓比的啞鈴形鋼管混凝土構(gòu)件壓彎復合試驗;(3)對比4根啞鈴形鋼管混凝土構(gòu)件壓彎復合作用下的試驗結(jié)果,分析軸壓比(n)對構(gòu)件抗彎剛度、抗彎承載力的影響。試驗結(jié)果表明:當軸壓比較小時(0～0.35)初始抗彎剛度和抗彎承載力隨軸壓比增大而增大,但當軸壓比超過0.35時,初始抗彎剛度和抗彎承載力隨軸壓比增大而減小;(4)將試驗所得的不同軸壓比影響下的啞鈴形鋼管混凝土構(gòu)件抗彎剛度、壓彎承載力相關(guān)曲線和已有規(guī)范、文獻的計算結(jié)果進行對比。對比發(fā)現(xiàn):現(xiàn)有規(guī)范的抗彎剛度公式計算結(jié)果比試驗值偏大,而N-M相關(guān)曲線方程式計算結(jié)果相比試驗結(jié)果偏小。
[Abstract]:The dumbbell concrete filled steel tube arch rib is widely used in engineering practice, and the proportion of dumbbell shaped concrete filled steel tube arch rib arch bridge is as high as 40% of the steel tube concrete arch bridge. It is of great engineering significance to study the mechanical properties of concrete filled dumbbell shaped steel tube (CFST). At present, there are few experimental studies related to the concrete filled steel tube members with dumbbell section, and the axial compression of concrete filled dumbbell steel tube (CFST) has been carried out. In addition, the research on concrete-filled steel tube (CFST) is mainly focused on ultimate bearing capacity, but less on stiffness. In engineering design, the research on concrete filled steel tube (CFST) with dumbbell section has not been carried out. In addition to carrying out load-carrying capacity limit state design, it is also necessary to carry out the normal use limit state design. It is particularly urgent to study the effect of external loading on stiffness bearing capacity of concrete filled dumbbell steel tube under compression and bending conditions. The influence of different axial compression ratio on flexural bearing capacity and flexural stiffness of concrete filled dumbbell steel tube is studied and analyzed. The specific work is as follows: (1) summarizing and sorting out the relevant tests and theoretical studies on the curves related to the bending stiffness and compressive and bending capacity of concrete-filled steel tubular (CFST) at home and abroad. (2) combining with the existing test data and conditions, the design of the test scheme for compression and bending is carried out. Four concrete filled dumbbell concrete filled steel tube members with different axial compression ratios were subjected to compression and bending tests. The results were compared with those of four dumbbell shaped concrete filled steel tube members under compression and bending conditions. The flexural stiffness of the concrete filled steel tube members under axial compression ratio was analyzed. The experimental results show that the initial bending stiffness and flexural capacity increase with the increase of axial compression ratio, but when the axial compression ratio exceeds 0.35, the initial flexural stiffness and flexural capacity increase with the axial compression ratio increasing, but when the axial compression ratio exceeds 0.35, the initial bending stiffness and the flexural bearing capacity increase with the increase of axial compression ratio. The initial flexural stiffness and flexural bearing capacity decrease with the increase of axial compression ratio. It is found that the calculated results of the existing formulas for bending stiffness are larger than the experimental values, while the results of the N-M correlation curve equations are smaller than the experimental results.
【學位授予單位】：福建農(nóng)林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441

【參考文獻】

相關(guān)期刊論文 前10條

1 季超;杜喜凱;張丹;;方鋼管再生混凝土柱彈性階段的抗彎剛度研究[J];河北農(nóng)業(yè)大學學報;2016年05期

2 李仁哲;覃浩;趙鳴;;圓鋼管混凝土壓彎構(gòu)件軸力-彎矩相關(guān)曲線分析及其應(yīng)用[J];浙江建筑;2016年05期

3 徐羊;姚勇;張兆強;陳代果;;方鋼管再生混凝土長柱偏心受壓力學性能研究[J];建筑結(jié)構(gòu);2016年09期

4 關(guān)萍;陳蘭響;劉晴晴;;鋼骨-鋼管高強混凝土偏心受壓柱非線性分析[J];華僑大學學報(自然科學版);2015年03期

5 陳曉旋;杜喜凱;潘奇;朱劍波;;方鋼管再生混凝土壓彎短柱受力性能試驗研究[J];河北農(nóng)業(yè)大學學報;2014年06期

6 羅雅婷;丁發(fā)興;龔永智;余志武;;啞鈴形截面鋼管混凝土軸壓中長柱穩(wěn)定性研究[J];建筑結(jié)構(gòu)學報;2013年S1期

7 尹曉東;李慶剛;王慶利;;鋼管高性能混凝土壓彎構(gòu)件的靜力性能(Ⅰ):試驗研究及有限元模擬[J];工業(yè)建筑;2013年03期

8 尹曉東;李慶剛;王慶利;;鋼管高性能混凝土壓彎構(gòu)件的靜力性能(Ⅱ):機理分析及承載力[J];工業(yè)建筑;2013年03期

9 劉曉;王連廣;李敏;;鋼管鋼骨混凝土柱壓彎性能試驗研究[J];工業(yè)建筑;2012年12期

10 李永進;廖飛宇;;中空夾層鋼管自密實混凝土壓彎構(gòu)件力學性能[J];蘭州理工大學學報;2012年06期

相關(guān)碩士學位論文 前6條

1 馬驥;圓鋼管再生混凝土柱靜力性能研究[D];哈爾濱工業(yè)大學;2013年

2 閆標;鋼管約束型鋼混凝土中長柱靜力性能及設(shè)計方法研究[D];蘭州大學;2013年

3 李大穩(wěn);鋼管混凝土短柱力學性能研究[D];中南大學;2012年

4 張潔;方鋼管混凝土柱的抗彎剛度研究[D];河北農(nóng)業(yè)大學;2011年

5 汪良賓;不銹鋼管混凝土抗拉承載力及壓彎構(gòu)件滯回性能研究[D];福州大學;2011年

6 肖澤榮;鋼管混凝土啞鈴形拱肋施工應(yīng)力分析與偏壓試驗研究[D];福州大學;2003年

，

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