本文選題：外包U形鋼混凝土組合梁　切入點(diǎn)：方鋼管混凝土柱　出處：《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形鋼混凝土組合梁內(nèi)隔板式節(jié)點(diǎn)的研究資料很少,對該類型節(jié)點(diǎn)的受力性能和承載能力的研究還不夠成熟,因此對內(nèi)隔板式節(jié)點(diǎn)開展研究具有重要的理論意義與工程價(jià)值。本文在本課題組已有研究基礎(chǔ)上,提出了構(gòu)造簡單、施工方便、便于實(shí)現(xiàn)裝配化的兩種新型節(jié)點(diǎn)形式-內(nèi)隔板鋼筋套筒式節(jié)點(diǎn)和內(nèi)隔板鋼筋貫穿式節(jié)點(diǎn),并對兩種節(jié)點(diǎn)的受力性能進(jìn)行了深入的對比研究,主要研究工作和取得的成果如下:基于本課題組已完成的試驗(yàn)研究,對試驗(yàn)中的內(nèi)隔板鋼筋截?cái)嗍焦?jié)點(diǎn)進(jìn)行低周往復(fù)荷載作用下的有限元模擬分析,并將有限元計(jì)算結(jié)果與試驗(yàn)結(jié)果進(jìn)行對比,兩者基本吻合。在模型驗(yàn)證的基礎(chǔ)上,對兩種新型節(jié)點(diǎn)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)和承載能力,考察了節(jié)點(diǎn)的內(nèi)力,較為精確地對比分析了兩種節(jié)點(diǎn)的應(yīng)力分布規(guī)律和傳力機(jī)制。研究結(jié)果表明:內(nèi)隔板鋼筋套筒式節(jié)點(diǎn)和內(nèi)隔板鋼筋貫穿式節(jié)點(diǎn)的破壞形態(tài)基本類同,均發(fā)生梁端彎曲破壞;正彎矩作用下兩節(jié)點(diǎn)的承載力相差不大,在負(fù)彎矩作用下內(nèi)隔板鋼筋套筒式節(jié)點(diǎn)承載力高于內(nèi)隔板鋼筋貫穿式節(jié)點(diǎn);內(nèi)隔板鋼筋貫穿式節(jié)點(diǎn)柱壁開孔不僅削弱了柱的承載力,而且負(fù)彎矩鋼筋周圍的鋼管柱腹板以及混凝土處出現(xiàn)了較為明顯的應(yīng)力集中現(xiàn)象,而內(nèi)隔板鋼筋套筒式節(jié)點(diǎn)由于上部隔板存在,節(jié)點(diǎn)域協(xié)調(diào)變形能力較好,使得節(jié)點(diǎn)域方鋼管柱壁和核心混凝土應(yīng)力分布均勻。設(shè)計(jì)大量的有限元分析試件,對影響節(jié)點(diǎn)承載力的諸多因素進(jìn)行分析,研究組合梁的高寬比、組合梁翼板厚度、U形鋼梁壁厚、翼板的縱向配筋率、內(nèi)部隔板的厚度、柱軸壓比等參數(shù)對內(nèi)隔板式節(jié)點(diǎn)承載力性能的影響。分析結(jié)果表明:組合梁的高寬比、組合梁翼板厚度對節(jié)點(diǎn)承載力有顯著影響,U形鋼梁壁厚、翼板的縱向配筋率對節(jié)點(diǎn)承載力有一定的影響,軸壓比、內(nèi)部隔板的厚度在一定的范圍內(nèi)對節(jié)點(diǎn)承載力影響不明顯。最后,在參數(shù)分析的基礎(chǔ)上,提出新型節(jié)點(diǎn)的設(shè)計(jì)建議。
[Abstract]:The research data of the inner partition joints of concrete-filled square steel tubular column and U-shaped steel reinforced concrete composite beams are few, and the research on the mechanical behavior and bearing capacity of this type of joints is not mature enough. Therefore, it is of great theoretical significance and engineering value to carry out research on the inner partition joints. On the basis of the existing research in our group, the paper puts forward that the structure is simple and the construction is convenient. There are two new types of joints that are convenient for assembly, I. e., inner partition steel sleeve joints and inner partition steel bar penetrating joints. The mechanical properties of the two kinds of joints are compared and studied in depth. The main research work and results obtained are as follows: based on the experimental research completed by our group, the finite element simulation analysis of the truncated joints of inner partition steel bar under low cycle reciprocating load is carried out. The finite element results are compared with the experimental results. Based on the model verification, the three dimensional nonlinear finite element analysis of two new types of joints is carried out, and the failure patterns and bearing capacity of the joints are discussed. The internal forces of the joints are investigated, and the stress distribution law and the force transfer mechanism of the two joints are compared and analyzed accurately. The results show that the failure patterns of the inner partition steel bar sleeve joint and the inner partition steel bar penetrating joint are basically the same. The bearing capacity of the two joints under the action of positive moment is not different, and the bearing capacity of the inner partition steel bar sleeve joint is higher than that of the inner partition steel bar through joint under the negative moment. The perforation of internal partition steel bar through the wall of the column not only weakens the bearing capacity of the column, but also shows a more obvious stress concentration phenomenon in the web of steel tube column and concrete around the negative moment steel bar. However, due to the existence of the upper spacer and the better coordinated deformation capacity in the joint domain, the stress distribution of square steel pipe column wall and core concrete in the joint domain is uniform. A large number of finite element analysis specimens are designed. Many factors affecting the bearing capacity of joints are analyzed. The ratio of height to width of composite beam, the thickness of wing plate, the thickness of U-shaped steel beam, the longitudinal reinforcement ratio of flange, the thickness of internal partition are studied. The influence of column axial compression ratio and other parameters on the bearing capacity of inner diaphragm joints is analyzed. The results show that the height to width ratio of composite beams and the thickness of wing plates of composite beams have a significant effect on the bearing capacity of U-shaped steel beams. The longitudinal reinforcement ratio of the flange has a certain influence on the bearing capacity of the joints, but the axial compression ratio and the thickness of the internal diaphragm have no obvious influence on the bearing capacity of the joints. Finally, based on the analysis of the parameters, the design suggestions for the new joints are put forward.
【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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