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

【摘要】：啞鈴形鋼管混凝土拱肋在工程實(shí)踐中得到大量運(yùn)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(dá)四成之多。因而,對(duì)啞鈴形鋼管混凝土的力學(xué)性能進(jìn)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(yàn)研究相對(duì)較少,已進(jìn)行的有啞鈴形鋼管混凝土軸壓、純彎、偏壓試驗(yàn),關(guān)于啞鈴形截面鋼管混凝土構(gòu)件的壓彎試驗(yàn)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(jì)方面,除了對(duì)構(gòu)件進(jìn)行承載能力極限狀態(tài)設(shè)計(jì)外,還需進(jìn)行正常使用極限狀態(tài)設(shè)計(jì)。因此,啞鈴形鋼管混凝土在壓彎狀態(tài)下外部荷加對(duì)剛度承載力影響的研究顯得尤為迫切。本文通過試驗(yàn),研究和分析壓彎復(fù)合作用下不同軸壓比對(duì)啞鈴形鋼管混凝土抗彎承載力和抗彎剛度兩個(gè)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(yàn)和理論研究現(xiàn)狀;(2)結(jié)合現(xiàn)有試驗(yàn)資料和條件,進(jìn)行壓彎試驗(yàn)方案設(shè)計(jì),進(jìn)行4根不同軸壓比的啞鈴形鋼管混凝土構(gòu)件壓彎復(fù)合試驗(yàn);(3)對(duì)比4根啞鈴形鋼管混凝土構(gòu)件壓彎復(fù)合作用下的試驗(yàn)結(jié)果,分析軸壓比(n)對(duì)構(gòu)件抗彎剛度、抗彎承載力的影響。試驗(yàn)結(jié)果表明:當(dāng)軸壓比較小時(shí)(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(dāng)軸壓比超過0.35時(shí),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(yàn)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(xiàn)的計(jì)算結(jié)果進(jìn)行對(duì)比。對(duì)比發(fā)現(xiàn):現(xiàn)有規(guī)范的抗彎剛度公式計(jì)算結(jié)果比試驗(yàn)值偏大,而N-M相關(guān)曲線方程式計(jì)算結(jié)果相比試驗(yàn)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(xué)位授予單位】：福建農(nóng)林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441

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