本文選題：盲眼螺栓Hollo-bolt + 抗拉性能�。� 參考：《煙臺大學(xué)》2017年碩士論文

【摘要】：盲眼螺栓HB用于梁柱半剛性連接節(jié)點(diǎn)的受拉區(qū)域時(shí),節(jié)點(diǎn)會(huì)因螺栓HB的套管被剪斷或者整個(gè)螺栓體從螺栓孔被拔出而提前失效,進(jìn)而導(dǎo)致結(jié)構(gòu)的可靠度指標(biāo)偏低。故尚需解決盲眼螺栓Hollo-bolt的抗拉承載力較差的問題。然而,目前對盲眼螺栓HB抗拉性能的研究存在以下兩點(diǎn)不足:(1)通過混凝土的粘結(jié)效應(yīng)來提高盲眼螺栓HB抗拉承載力的研究僅局限于結(jié)構(gòu)層面,然而,通過考慮混凝土的粘結(jié)效應(yīng)以提高單個(gè)盲眼螺栓HB的抗拉性能的研究還缺乏相關(guān)的研究方法和試驗(yàn)數(shù)據(jù);混凝土的粘結(jié)效應(yīng)對通過焊接錨固鋼筋改良的盲眼螺栓HB的作用機(jī)理也尚不明確;(2)目前,國內(nèi)外對盲眼螺栓HB T-型連接抗拉性能的研究主要集中于對傳統(tǒng)T型連接的研究,而對通過兩角鋼背對背形成的T型連接的抗拉性能研究鮮有報(bào)道。混凝土的粘結(jié)效應(yīng)和角度厚度等變量對此類T型連接中盲眼螺栓HB的抗拉性能影響還缺乏必要的試驗(yàn)和理論研究。因此,本文基于以上兩點(diǎn)研究不足,分別從構(gòu)件層次和結(jié)構(gòu)層次開展盲眼螺栓HB抗拉性能研究具有重大的工程意義。本文主要工作如下:第一:采用新型抗拔試驗(yàn)裝置,對各種工況下的單個(gè)盲眼螺栓HB進(jìn)行了抗拉試驗(yàn)。試驗(yàn)變量包括螺栓類型、混凝土強(qiáng)度等級和是否考慮混凝土粘結(jié)效應(yīng)等。試驗(yàn)獲得了試件的破壞模式和荷載-位移關(guān)系曲線,主要從剛度、強(qiáng)度、延性和斷裂能四個(gè)方面考察各種工況下盲眼螺栓HB的抗拉性能。結(jié)果表明:考慮混凝土粘結(jié)效應(yīng)的改良后盲眼螺栓HB的抗拉性能可以與同等級普通高強(qiáng)度螺栓相媲美,甚者,更為優(yōu)越;第二:運(yùn)用有限元軟件ABAQUS建立15個(gè)螺栓軸向拉伸有限元模型。通過文獻(xiàn)試驗(yàn)結(jié)果和本文試驗(yàn)結(jié)果與有限元模擬結(jié)果進(jìn)行比較,以驗(yàn)證有限元模型的有效性。通過對比發(fā)現(xiàn):有限元結(jié)果和試驗(yàn)結(jié)果以及文獻(xiàn)試驗(yàn)結(jié)果吻合較好,從而為后文盲眼螺栓HB三階段剛度模型提出做準(zhǔn)備;第三:基于諾丁漢大學(xué)的研究,對Type A、Type B和Type C三類盲眼螺栓HB進(jìn)行機(jī)理分析;基于彈簧串并聯(lián)剛度關(guān)系,運(yùn)用組件法量化得出初始階段套管、中心螺桿、錨固鋼筋和混凝土對分擔(dān)外拉力的貢獻(xiàn)作用;基于現(xiàn)有對螺栓剛度的研究,并在大量有限元分析擬合的基礎(chǔ)上,提出盲眼螺栓HB的三線段剛度模型并驗(yàn)證其有效性。結(jié)果表明:盲眼螺栓HB三階段剛度模型可用于工程結(jié)構(gòu)的剛度預(yù)測;第四:對7個(gè)通過角鋼形成的螺栓T-型連接件進(jìn)行軸向拉伸試驗(yàn)。試驗(yàn)得到了試件的破壞模式,荷載—位移關(guān)系曲線,應(yīng)變-時(shí)程曲線等數(shù)據(jù),并初步探究了螺栓類別、鋼管柱壁的厚度、角鋼的厚度等對節(jié)點(diǎn)的剛度、承載力、延性以及耗能的作用機(jī)理和影響規(guī)律。
[Abstract]:When the blind bolt HB is used in the tension area of Liang Zhu semi-rigid connection, the joint will be cut off by the casing of bolt HB or the whole bolt body will be pulled out from the bolt hole, which will lead to the low reliability index of the structure. Therefore, it is necessary to solve the problem of poor tensile capacity of blind bolt Hollo-bolt. However, the current research on HB tensile capacity of blind bolt is limited to the structural level through the bond effect of concrete. By considering the bond effect of concrete to improve the tensile performance of single blind bolt HB, there is still a lack of relevant research methods and experimental data. The mechanism of bond effect of concrete on HB of blind bolt improved by welding Anchorage bar is not clear. At present, the research on tensile performance of blind bolt HB T- connection is mainly focused on the traditional T-type connection at home and abroad. However, there are few reports on the tensile properties of T-type connections formed from the back to back of two angle steel. The effect of bond effect and angle thickness of concrete on the tensile properties of blind bolt HB in T-joint is still lack of necessary experimental and theoretical study. Therefore, based on the deficiency of the above two researches, it is of great engineering significance to study the HB tensile properties of blind eye bolts from the component level and the structure level respectively. The main work of this paper is as follows: first, the tensile test of single blind bolt HB under various working conditions is carried out by using a new type of pull-out test device. Test variables include bolt type, concrete strength grade and whether to consider concrete bond effect. The failure modes and load-displacement curves of the specimens were obtained. The tensile properties of blind eye bolts HB under various working conditions were investigated from four aspects: stiffness, strength, ductility and fracture energy. The results show that the tensile properties of the improved blind bolt HB considering the bond effect of concrete are comparable to those of the ordinary high strength bolts of the same grade, which is more superior than that of the ordinary high strength bolts of the same grade. Secondly, 15 bolt axial tension finite element models are established by using finite element software Abaqus. The validity of the finite element model is verified by comparing the experimental results with the finite element simulation results. It is found that the finite element results are in good agreement with the experimental results and the experimental results are in good agreement with the literature, so as to prepare for the HB three-stage stiffness model of post-illiterate eye bolts. Third, based on the research of Nottingham University, Based on the stiffness relationship of spring series and parallel connection, the contribution of casing, central screw, anchor bar and concrete to external tension in initial stage is obtained by means of component method, which is based on the mechanism analysis of Type Agna Type B and Type C blind bolt HB. Based on the existing research on bolt stiffness and on the basis of a large number of finite element analysis and fitting, a three-segment stiffness model of blind eye bolt HB is proposed and its validity is verified. The results show that the HB three-stage stiffness model of blind bolt can be used to predict the stiffness of engineering structure. Fourth, the axial tensile test of seven bolt T-type connections formed through angle steel is carried out. The data of failure mode, load-displacement curve, strain-time curve and so on are obtained, and the stiffness and bearing capacity of the joint, such as bolt type, the thickness of column wall of steel tube, the thickness of angle steel, etc. Ductility and energy dissipation mechanism and influence law.
【學(xué)位授予單位】：煙臺大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU391

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本文編號：2020467