本文選題：楔塊裝置　切入點：露出型柱腳　出處：《湖南大學(xué)》2013年博士論文

【摘要】：露出型鋼柱腳在普通鋼結(jié)構(gòu)和輕型鋼結(jié)構(gòu)中得到廣泛應(yīng)用。本文針對傳統(tǒng)普通露出型鋼柱腳節(jié)點在反復(fù)加載條件下其恢復(fù)力特性表現(xiàn)為滑移型且柱腳耗能不足的特點,研究了一種帶楔塊的無滑移型露出型鋼柱腳,其抗震性能明顯改善。結(jié)合國家自然科學(xué)基金資助項目“汶川地震災(zāi)害分析和救災(zāi)措施的研究”(50848008)和國家高技術(shù)研究發(fā)展計劃(863項目)“再生混凝土和新型鋼結(jié)構(gòu)建筑材料關(guān)鍵技術(shù)與應(yīng)用”(2009AA032304),對這種新型鋼結(jié)構(gòu)柱腳節(jié)點的力學(xué)性能進(jìn)行了理論分析、試驗研究與數(shù)值模擬,并對新型柱腳鋼框架的動力性能開展研究。本文的主要工作和成果如下： 考慮錨桿、鋼柱底板、混凝土底座、墊圈及螺帽等變形的影響,推導(dǎo)了露出型鋼柱腳的變形及轉(zhuǎn)動剛度計算公式；研究了帶楔塊裝置鋼柱腳和普通鋼柱腳的工作機(jī)理、力學(xué)性能,得出了帶楔塊裝置柱腳恢復(fù)力模型表現(xiàn)為無滑移型,普通露出型柱腳恢復(fù)力模型表現(xiàn)為滑移型。對帶楔塊新型柱腳和普通柱腳試件分別進(jìn)行了低周往復(fù)循環(huán)加載試驗,并考慮不同螺栓數(shù)及柱軸壓力等情況,得出了各自的恢復(fù)力特性；驗證了本文所推導(dǎo)的柱腳計算公式和所得到的恢復(fù)力模型是實用有效的；帶楔塊露出型柱腳由于彈簧的推動,楔塊的切入,消除了由于螺栓桿塑性變形產(chǎn)生的柱腳底板與基礎(chǔ)的縫隙,柱腳始終不松動；與普通螺栓連接柱腳相比,新型柱腳剛度退化減慢,延性和耗能能力明顯提高,表現(xiàn)出良好的抗震性能。 考慮材料非線性、接觸非線性以及螺栓數(shù)量及排列對柱腳受力和抗震性能的影響,對各柱腳建立三維有限元模型進(jìn)行了數(shù)值模擬。有限元分析結(jié)果與試驗結(jié)果吻合較好,滯回曲線和骨架曲線的變化趨勢與試驗結(jié)果相同,在試件屈服前曲線基本為線性,屈服后出現(xiàn)明顯的非線性,軸力的增加在一定范圍內(nèi)對柱腳彎矩承載力的提高是有益的,但同時柱腳的耗能能力也有所降低；節(jié)點域?qū)χ休^強的約束作用,從而導(dǎo)致骨架曲線在塑性區(qū)的試驗值較有限元分析值稍大；螺栓的增加對柱腳在承載力和剛度方面都較有利。 提出了用ANSYS的Link8單元和拉型Link10單元串聯(lián)起來再與壓型Link10單元并聯(lián)模擬滑移型柱腳錨桿,用壓型Link10單元來模擬滑移型柱腳底座在低周反復(fù)荷載作用下的簡化數(shù)值模擬技術(shù)；用ANSYS的Link8單元并結(jié)合單元的生死技術(shù)及APDL語言開發(fā)技術(shù)來模擬無滑移型柱腳底座在低周反復(fù)荷載作用下的簡化數(shù)值模擬技術(shù)。經(jīng)與試驗結(jié)果對比,本文所提出的柱腳數(shù)值模擬技術(shù)效果良好,實用可靠。 提出了用ANSYS的Combin39單元與壓型Link10單元并聯(lián)設(shè)置,用前者來模擬柱腳錨桿、用后者來模擬柱腳底座,并利用Combin39單元可自定義力-位移輸入曲線來定義其本構(gòu)關(guān)系的特性,通過分別輸入不同的力-位移曲線來實現(xiàn)有滑移型與無滑移型柱腳在隨機(jī)地震激勵下的數(shù)值模擬技術(shù),對框架結(jié)構(gòu)的耗能特性以及在地震激勵作用下的動力響應(yīng)進(jìn)行了研究。新型帶楔塊彈簧減震裝置可以有效控制結(jié)構(gòu)層間位移、減小結(jié)構(gòu)地震反應(yīng),更好的耗散地震能量,使帶楔塊柱腳結(jié)構(gòu)表現(xiàn)出更好的抗震性能。 總之,論文基于試驗、理論推導(dǎo)及有限元分析,研究了一種新型帶楔塊的無滑移型露出型鋼柱腳的抗震性能；且同時推導(dǎo)出了傳統(tǒng)普通有滑移露出型鋼柱腳及新型帶楔塊彈簧減震裝置無滑移型鋼柱腳的理論計算公式,并在數(shù)值模擬技術(shù)上有成功突破,為這種新型無滑移露出型鋼柱腳的推廣提供了可靠的依據(jù)。
[Abstract]:A type of steel column is widely used in ordinary steel structure and light steel structure. Based on the traditional show type steel column node under cyclic loading under the condition of the restoring force characteristics shows the characteristics of slip type and column energy shortage, on a non slip type exposed type steel column base with wedge, the seismic the performance is significantly improved. Research on Wenchuan earthquake disaster analysis and disaster relief measures combined with the National Natural Science Fund Project "(50848008) and the national high technology research and development program (863 Program)" recycled concrete and new steel structure building materials and application of key technologies "(2009AA032304), the mechanical properties of this new type of steel structure column node by theoretical analysis, experimental research and numerical simulation, and the dynamic performance of the new type of column steel frame is studied. The main work and achievements are as follows:
Considering the anchor, steel column base, concrete base, washer and nut impact deformation, are derived with deformation type steel column base and rotational stiffness formula; studied the working mechanism of steel column base with wedge device and ordinary steel column mechanical properties obtained with wedge device column restoring force model performance no slip type, ordinary type of column exposed restoring force model for slip type. On the wedge model and ordinary column column specimens were reversed cyclic loading tests, and considering the difference in the number of bolts and column axial pressure, the restoring force characteristics of the obtained; verify the derivation the column formula and the restoring force model is effective; with wedge type column due to the force of the spring show, the wedge cut, due to the elimination of the bolt rod produced by plastic deformation and foundation base plate The column is not always loose; the gap, compared with ordinary bolt connection column, new column stiffness degradation slow, ductility and energy dissipation capacity increased significantly, showing a good seismic performance.
Considering the material nonlinearity, contact nonlinearity and the influence of the number and arrangement of bolt force and seismic performance of the column, numerical simulation was carried out for each column to establish a three-dimensional finite element model. Finite element analysis results agree well with the experimental results, the changing trend of hysteretic curve and skeleton curve is identical with the test results, the specimens before yielding. The curve is linear, obvious nonlinear yield, the increase of axial force on the bearing capacity of the moment in a certain range is beneficial to improve, but also decreased the energy dissipation capacity of the column; the node domain has strong restriction on the column, resulting in finite element analysis of skeleton curve value is slightly larger in value the test of the plastic zone; the increase of bolt column in the bearing capacity and stiffness is more advantageous.
A Link8 unit ANSYS and pull type Link10 unit series with pressure type Link10 parallel simulation sliding column bolt, a simplified numerical simulation technology for pressure type Link10 element to simulate the slip type column base under low cyclic loading; simplified numerical simulation technology with ANSYS Link8 single element and combining unit the birth and death technology and APDL language development technology to simulate the non slip type column base under low cyclic loading. By comparing with the experimental results, the numerical simulation technology of column effect is good, reliable and practical.
ANSYS is proposed by the Combin39 unit and Link10 unit set parallel pressure type, with the former to simulate the column bolt, with the latter to simulate the column base, and the Combin39 unit can customize the force displacement curve of the input to define the constitutive characteristics, to achieve by inputting different force displacement curves of numerical simulation technology in the random seismic excitation slip and no slip type column, energy dissipation characteristics of the frame structure under seismic excitation and dynamic response were studied. The model with wedge spring damping device can effectively control the structure of the interlayer displacement, reduce the earthquake response of the structure, dissipation of seismic energy better, the wedge the column structure showed better seismic performance.
In conclusion, based on experiments, theoretical analysis and finite element analysis, studies a new wedge with no slip type exposed type seismic performance of steel column base; and also derived the conventional slip formula exposed type steel column and model with wedge spring damping device of non slip type steel column theory. And in the numerical simulation are successful breakthroughs in technology, provide a reliable basis for the promotion of this kind of non slip exposed type steel column.

【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU391;TU352.11

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