本文關(guān)鍵詞：復(fù)式鋼管混凝土柱—鋼梁節(jié)點(diǎn)力學(xué)性能研究　出處：《長安大學(xué)》2013年博士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 復(fù)式鋼管混凝土柱-鋼梁節(jié)點(diǎn) 抗震性能 破壞形態(tài) 非線性有限元分析 彎矩-轉(zhuǎn)角曲線 抗剪承載力

【摘要】：復(fù)式鋼管混凝土柱具有較高抗壓承載力，在強(qiáng)地震作用下能體現(xiàn)出很好防倒塌能力，可將其用于大跨度橋梁或超高層房屋建筑中。內(nèi)圓外方的復(fù)式鋼管混凝土柱同時(shí)兼有整潔美觀及節(jié)點(diǎn)構(gòu)造簡便等特點(diǎn)，故在工程中日益受到重視。 然而，目前國內(nèi)外對復(fù)式鋼管混凝土柱-鋼梁連接節(jié)點(diǎn)的研究較少，阻礙了復(fù)式鋼管混凝土柱結(jié)構(gòu)的發(fā)展應(yīng)用，所以有必要研究新型復(fù)式鋼管混凝土柱-鋼梁節(jié)點(diǎn)的設(shè)計(jì)方法及抗震性能。綜合我國現(xiàn)狀及目前鋼管混凝土柱節(jié)點(diǎn)的研究成果，本文設(shè)計(jì)了一種新型復(fù)式鋼管混凝土柱與鋼梁的連接節(jié)點(diǎn)形式，對其進(jìn)行了低周往復(fù)荷載試驗(yàn)，同時(shí)采用數(shù)值模擬及理論分析相結(jié)合的方法對此類新型節(jié)點(diǎn)進(jìn)行深入研究，主要研究內(nèi)容和取得的成果如下： 本文對6個(gè)新型復(fù)式鋼管混凝土柱-鋼梁節(jié)點(diǎn)試件和1個(gè)單鋼管混凝土柱-鋼梁節(jié)點(diǎn)試件進(jìn)行了低周往復(fù)荷載作用下的試驗(yàn)研究，此類新型節(jié)點(diǎn)的傳力構(gòu)件包括錨固腹板、水平端板、連接板及豎向肋板。結(jié)果表明：豎向肋板外伸長度可有效調(diào)節(jié)節(jié)點(diǎn)破壞時(shí)塑性鉸位置，錨固腹板加肋可有效提高節(jié)點(diǎn)承載力；此類新型復(fù)式鋼管混凝土柱-鋼梁節(jié)點(diǎn)的破壞模態(tài)基本為水平端板與鋼梁翼緣連接處出現(xiàn)塑性鉸破壞；復(fù)式鋼管混凝土柱節(jié)點(diǎn)與方鋼管混凝土柱節(jié)點(diǎn)相比，承載力較高、耗能能力強(qiáng)、剛性和延性均較好，適用于抗震設(shè)防區(qū)的鋼管混凝土結(jié)構(gòu)中。 采用有限元分析軟件ABAQUS對新型復(fù)式鋼管混凝土柱-鋼梁節(jié)點(diǎn)模型進(jìn)行非線性有限元分析。數(shù)值分析得到的滯回曲線、骨架曲線及節(jié)點(diǎn)破壞模態(tài)與試驗(yàn)結(jié)果吻合良好，證明了有限元模型在選取單元類型、材料本構(gòu)及破壞準(zhǔn)則方面的合理性。在此基礎(chǔ)上，對復(fù)式鋼管混凝土柱-鋼梁節(jié)點(diǎn)進(jìn)行了應(yīng)力分析，，此類新型節(jié)點(diǎn)傳力路徑明確，在高軸壓比作用下具有良好的工作性能，錨固腹板加肋傳遞節(jié)點(diǎn)應(yīng)力的能力更好。 在數(shù)值模型的基礎(chǔ)上，對典型節(jié)點(diǎn)試件SBJ2-2進(jìn)行系統(tǒng)參數(shù)分析。對比了梁端加載方式與柱端加載方式對節(jié)點(diǎn)破壞模態(tài)的影響；確定出豎向肋板與錨固腹板的合理高度；得出了各組參數(shù)下節(jié)點(diǎn)的彎矩-轉(zhuǎn)角曲線及對應(yīng)的節(jié)點(diǎn)初始剛度曲線；采用三參數(shù)冪模型建立了此新型節(jié)點(diǎn)的彎矩-轉(zhuǎn)角實(shí)用計(jì)算式，擬合出節(jié)點(diǎn)的初始剛度計(jì)算式；根據(jù)節(jié)點(diǎn)彎矩-轉(zhuǎn)角計(jì)算式所得結(jié)果與試驗(yàn)、數(shù)值模擬結(jié)果進(jìn)行對比，吻合良好。本文建立的節(jié)點(diǎn)彎矩-轉(zhuǎn)角全過程計(jì)算式可評價(jià)各個(gè)設(shè)計(jì)參數(shù)對節(jié)點(diǎn)受力的影響程度，為此類新型節(jié)點(diǎn)的工程設(shè)計(jì)奠定理論基礎(chǔ)。 研究此類新型復(fù)式鋼管混凝土柱-鋼梁節(jié)點(diǎn)的抗剪受力性能�？紤]節(jié)點(diǎn)在豎向軸力和梁端往復(fù)荷載作用下，鋼管柱壁的環(huán)向拉應(yīng)力對抗剪承載力的削弱作用；節(jié)點(diǎn)域的鋼材采用抗剪三折線模型，內(nèi)外層混凝土采用上升段和水平段抗剪模型，將各部分疊加建立了此類新型節(jié)點(diǎn)的抗剪承載力計(jì)算式；其中外方鋼管腹板與豎向肋板對節(jié)點(diǎn)抗剪承載力的貢獻(xiàn)值較大；將抗剪承載力計(jì)算結(jié)果與試驗(yàn)結(jié)果進(jìn)行對比，兩者吻合良好，從而驗(yàn)證了此類新型節(jié)點(diǎn)抗剪承載力計(jì)算方法的正確性。
[Abstract]:With the bearing capacity of composite concrete-filled steel tube column with high compressive strength, can reflect the good ability of anti collapse under strong earthquake, which can be used for long-span bridges or high-rise buildings. Composite concrete-filled steel tube column inside the circle of both neat and simple structure nodes and other characteristics, so in engineering more and more attention.
However, the current domestic and foreign research on composite concrete-filled steel tube column steel beam joint less hindered the development of the application structure of composite concrete-filled steel tube column, so it is necessary to study the new design method of composite concrete-filled steel tube column steel beam joints and seismic performance. Research results of China's present situation and the concrete filled steel tubular column joints in this paper. The design of the connection form a new composite concrete-filled steel tube column and steel beam, the low cyclic loading tests are carried out on it at the same time, in-depth study of these new nodes by the analytical method of numerical simulation and theory, the main research contents and achievements are as follows:
In this paper, 6 new composite concrete-filled steel tube column steel beam joints and 1 single CFST column and steel beam joint specimens were studied under low cyclic loading, the force transmission component of this new type of node including anchorage webs, horizontal end plate, a connecting plate and a vertical rib plate. The results show that: the vertical rib extending length can effectively adjust the node failure location of plastic hinge, anchorage webs with ribs can effectively improve the bearing capacity of the joint; the failure mode of this new type of composite concrete-filled steel tube column and steel beam joint is the basic level of the end plate and steel beam flange connections are plastic hinge failure; compared to the connections of multibarrel tube confined concrete column joints and square concrete filled steel tubular column, high bearing capacity, energy dissipation capacity, rigidity and ductility are good, concrete filled steel tube structure is suitable for seismic zone.
Using finite element analysis software ABAQUS, the nonlinear finite element analysis of the new type of composite concrete-filled steel tube column and steel beam joint model. Numerical analysis of the hysteretic curves, skeleton curves and the joint failure modes agree well with the experimental results, proved that the finite element model in the selection of element type, the rationality of material constitutive model and failure criterion in this paper. On the stress analysis of composite concrete-filled steel tube column and steel beam joint, force of the new type of connection path is clear, with high axial compression ratio has good performance under the action of anchorage webs with ribs transfer node stress better.
Based on the numerical model of the specimen SBJ2-2 system parameters analysis. Comparison of the effects of beam end loading and column end loading on the joint failure mode; determine a reasonable height of vertical ribs and anchorage webs; stiffness curve joint initial bending moment - the parameters of nodes and the corresponding rotation angle curve the calculation formula of the rotation moment; this new node is established using the three parameter power model, fitting the calculated stiffness of the initial node type; the calculation results and test according to the nodal moment rotation, numerical simulation results are compared. The formula can be in good agreement with the effect of design parameters to evaluate various stress the whole process of node joint moment - this angle, lay the theoretical foundation for the new type of connection design.
The shear properties of this new type of composite concrete-filled steel tube column and steel beam joint. Considering the effect of axial force and vertical nodes in the beam under cyclic loading, steel column wall circumferential tensile stress shear weakened capacity; the node domain is used for steel shear three line model, the inner and outer concrete rise section and horizontal section shear model, each part was built by superimposing the new type of connection of the shear bearing capacity formula; the foreign steel webs and the vertical ribs on the shear resistance contribution value is bigger; the shear capacity calculation results were compared with experimental results, good agreement, which proved to be correct the calculation method for the shear bearing capacity of the new type of connection.

【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2013
【分類號】：TU398.9

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 徐亞豐;陳謙;朱紹杰;;復(fù)式鋼管混凝土柱-鋼梁空間節(jié)點(diǎn)有限元研究[J];沈陽建筑大學(xué)學(xué)報(bào)(自然科學(xué)版);2015年01期

本文編號：1418252