本文關(guān)鍵詞：鋼筋混凝土箱型截面壓彎構(gòu)件破壞形態(tài)試驗研究　出處：《蘇州科技大學》2016年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 箱型截面 壓彎破壞 影響因素

【摘要】：為了研究箱型截面壓彎構(gòu)件的破壞形態(tài)及其影響因素,本文首先對3個箱型截面構(gòu)件模型進行了單項加載試驗,將試驗結(jié)果與理論分析進行對比,研究了固端約束作用、剪力滯效應和軸壓比對箱型壓彎構(gòu)件破壞形態(tài)的影響;其次,利用有限元軟件ABAQUS對試驗內(nèi)容進行模擬,驗證了所述分析模型的正確性和可行性;最后,通過有限元模擬分析了腹板寬厚比對此類構(gòu)件破壞形態(tài)的影響。分析結(jié)果表明:(1)箱型截面構(gòu)件在恒軸力和單調(diào)水平荷載的作用下主要發(fā)生彎曲破壞,但不可忽略腹板的抗剪作用;構(gòu)件破壞過程中存在明顯的剪力滯效應及約束效應;受拉翼板和受壓翼板破壞最嚴重部位分別在中間和固端之間以及固端截面。(2)軸壓比對箱型截面壓彎構(gòu)件的極限承載力影響不明顯,總體呈現(xiàn)軸壓比越大,極限承載力越大的趨勢;軸壓比越大,構(gòu)件的脆性越大,塑性變形能力越差。(3)試件出現(xiàn)明顯的正剪力滯效應且受壓翼板比受拉翼板嚴重,對于受拉翼板中間截面比固端截面明顯,對于受壓翼板是固端截面比中間截面明顯,另外,不同翼板剪力滯效應受軸壓比的影響也不同;固端干擾作用使得試件固端外壁壓應力增大,在一定范圍內(nèi)影響了試件彎曲正應力在豎向的分布。(4)腹板寬厚比越大,構(gòu)件的極限承載力越小,延性越好。本文通過試驗研究,結(jié)合理論分析和有限元模擬,得到箱型截面壓彎構(gòu)件的破壞形態(tài)及其影響因素,進而分析了這些因素的作用效果,對充實理論和后續(xù)研究有一定的參考價值。
[Abstract]:In order to study the failure pattern of box section members and its influencing factors, three box section member models were tested under single loading, and the experimental results were compared with the theoretical analysis. The effects of end restraint, shear lag effect and axial compression ratio on the failure pattern of box bending members are studied. Secondly, the finite element software ABAQUS is used to simulate the content of the experiment, which verifies the correctness and feasibility of the analysis model. Finally. The influence of the web width to thickness ratio on the failure pattern of this kind of member is analyzed by finite element simulation. The results show that the box section member is mainly subjected to bending failure under the constant axial force and monotone horizontal load. However, the shear resistance of web should not be ignored. There are obvious shear lag effect and constraint effect in the process of failure. The influence of axial compression ratio on ultimate bearing capacity of box section bending members is not obvious, and the overall axial compression ratio is larger. The greater the ultimate bearing capacity; The greater the axial compression ratio, the greater the brittleness of the members, and the worse the plastic deformation. 3) the positive shear lag effect appears in the specimens, and the compression flange is more serious than the tensile flange, and the middle section is more obvious than the fixed end section for the tensile flange. For the compressed flange, the fixed end section is more obvious than the middle section, in addition, the shear lag effect of different flange is influenced by the axial compression ratio. The stress of the external wall of the specimen increases due to the interference of the end of the specimen, which affects the vertical distribution of the normal stress in the vertical direction. 4) the larger the ratio of width to thickness of the web is, the smaller the ultimate bearing capacity of the member is. The ductility is better. Through experimental research, combined with theoretical analysis and finite element simulation, the failure patterns and influencing factors of box section compression and bending members are obtained, and then the effect of these factors is analyzed. It has certain reference value to enrich the theory and further study.
【學位授予單位】：蘇州科技大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU375

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