本文選題：方鋼管混凝土柱 + 外包U形鋼混凝土組合梁��； 參考：《山東建筑大學(xué)》2017年碩士論文

【摘要】：方鋼管混凝土柱-外包U形鋼混凝土組合梁構(gòu)成的結(jié)構(gòu)體系是近些年新興的一種鋼-混凝土組合結(jié)構(gòu)形式,具有承載力高、剛度大、穩(wěn)定性好、施工便捷、綜合效益高等優(yōu)點(diǎn),已越來越受到工程界和學(xué)術(shù)界的普遍關(guān)注。本文基于本課題組提出的方鋼管混凝土柱-外包U形鋼混凝土組合梁隔板貫通鋼筋截斷式節(jié)點(diǎn),提出了改善負(fù)彎矩鋼筋與鋼管柱連接處受力性能的一種新型節(jié)點(diǎn)形式-隔板貫通鋼筋套筒式節(jié)點(diǎn),并利用ABAQUS有限元分析軟件對新型節(jié)點(diǎn)進(jìn)行了抗剪性能的研究,主要有如下工作和成果:(1)利用ABAQUS軟件對本課題組完成的方鋼管混凝土柱-外包U形鋼混凝土組合梁隔板貫通鋼筋截斷式節(jié)點(diǎn)試驗(yàn)進(jìn)行了低周往復(fù)荷載作用下的有限元模擬,有限元分析結(jié)果與試驗(yàn)結(jié)果在節(jié)點(diǎn)變形、應(yīng)力分布、破壞形態(tài)、滯回曲線以及骨架曲線等方面均吻合較好。(2)基于驗(yàn)證的有限元模型,針對新型節(jié)點(diǎn)試件,設(shè)計了發(fā)生節(jié)點(diǎn)域剪切破壞的有限元試件,對其進(jìn)行三維非線性有限元分析,探討了節(jié)點(diǎn)的破壞形態(tài)和節(jié)點(diǎn)變形,較為精確地分析了節(jié)點(diǎn)的應(yīng)力分布規(guī)律、傳力機(jī)制以及抗剪承載力。研究結(jié)果表明:節(jié)點(diǎn)核心區(qū)由原來的矩形變成了平行四邊形,節(jié)點(diǎn)發(fā)生了明顯的剪切變形;節(jié)點(diǎn)核心區(qū)的抗剪承載力主要由核心區(qū)方鋼管柱腹板和混凝土共同承擔(dān),核心區(qū)混凝土主要在沿對角線方向形成“斜壓桿”來抵抗梁端翼緣的壓力;而核心區(qū)鋼管柱腹板則主要通過在對角線形成“斜拉桿”來抵抗節(jié)點(diǎn)的外力。(3)對新型節(jié)點(diǎn)進(jìn)行抗剪承載力參數(shù)化分析,研究影響節(jié)點(diǎn)抗剪承載力的主要因素和影響規(guī)律。研究結(jié)果表明:混凝土翼板的厚度、柱截面含鋼率、鋼管柱鋼材強(qiáng)度對節(jié)點(diǎn)域極限抗剪承載力的影響較大;鋼管柱混凝土強(qiáng)度以及貫通隔板的厚度對節(jié)點(diǎn)極限抗剪承載力的影響有限;當(dāng)軸壓比為0-0.3時,適當(dāng)增大方鋼管混凝土柱的軸壓比可在一定程度上提高節(jié)點(diǎn)的極限抗剪承載力,當(dāng)軸壓比為0.3-0.6時,軸壓比對節(jié)點(diǎn)極限抗剪承載力的影響不大;混凝土翼板的寬度對節(jié)點(diǎn)極限抗剪承載力幾乎沒有影響。(4)提出新型節(jié)點(diǎn)的極限抗剪承載力簡化公式,并將簡化公式的計算結(jié)果與有限元計算結(jié)果進(jìn)行比較,兩者吻合較好,具有一定的適用性。
[Abstract]:The structural system composed of concrete-filled square steel tube column and U-shaped steel reinforced concrete composite beam is a new type of steel-concrete composite structure in recent years. It has the advantages of high bearing capacity, high stiffness, good stability, convenient construction, high comprehensive benefit and so on. It has been paid more and more attention by the engineering and academic circles. Based on the concrete filled square steel tube column and U-shaped steel concrete composite beam partition plate proposed by our group, the steel bar truncated joint is used in this paper. In this paper, a new type of joint form, that is, the diaphragm through steel bar sleeve joint, is proposed to improve the behavior of negative moment steel bar and steel pipe column. The shear behavior of the new joint is studied by using Abaqus finite element analysis software. The main works and achievements are as follows: (1) finite element simulation is carried out under low-cycle reciprocating load to test the truncated joint of concrete-filled square steel tubular column and U-shaped steel concrete composite beam, which is completed by our research group with Abaqus software. The results of finite element analysis agree well with the experimental results in the aspects of joint deformation, stress distribution, failure morphology, hysteretic curve and skeleton curve. (2) based on the validated finite element model, a new type of joint specimen is proposed. The finite element specimens with shear failure in the joint domain are designed and analyzed by three dimensional nonlinear finite element method. The failure patterns and joint deformation of the joints are discussed, and the stress distribution law of the joints is analyzed more accurately. Force transfer mechanism and shear capacity. The results show that the core region of the joint is changed from rectangle to parallelogram, and the shear capacity of the joint is mainly borne by the web plate and concrete of square steel pipe column in the core area. The concrete in the core area mainly forms "oblique compression bar" along diagonal direction to resist the pressure of the flange at the end of the beam. On the other hand, the web plate of steel tube column in the core area is mainly used to resist the external force of the joint by forming diagonal "diagonal bar". (3) the parametric analysis of the shear bearing capacity of the new joint is carried out, and the main factors affecting the shear bearing capacity of the joint and the influencing law are studied. The results show that the thickness of concrete flange, the steel content of column section and the steel strength of steel pipe column have great influence on the ultimate shear bearing capacity in the joint region. When the axial compression ratio is 0-0.3, the ultimate shear capacity of joints can be improved by increasing the axial compression ratio of concrete-filled steel tubular columns. When the axial compression ratio is 0.3-0.6, the axial compression ratio has little effect on the ultimate shear bearing capacity of the joints, and the width of the concrete flange has little effect on the ultimate shear bearing capacity of the joints. (4) A simplified formula for the ultimate shear bearing capacity of the new joints is proposed. The calculated results of the simplified formula are compared with those of the finite element method, which are in good agreement with each other and have certain applicability.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.9

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