發(fā)布時(shí)間：2018-09-18 08:15

【摘要】：隨著土木工程結(jié)構(gòu)日益趨向于大跨、高聳、復(fù)雜以及施工便捷快速,現(xiàn)有的建筑材料也需要得到相應(yīng)地發(fā)展優(yōu)化,才能滿足現(xiàn)代工程結(jié)構(gòu)的建造要求。傳統(tǒng)的工字形鋼梁雖然具有強(qiáng)度高,結(jié)構(gòu)重量輕的優(yōu)點(diǎn),但常因穩(wěn)定性不足,不能充分發(fā)揮其強(qiáng)度高的優(yōu)勢(shì)。因此,出現(xiàn)了鋼管空翼緣工字形梁。這種梁通過將傳統(tǒng)工字形鋼梁的上、下翼緣替換成各種截面的鋼管形成,如:將上下翼緣都換成三角形鋼管的空翼緣梁、僅將上翼緣換成矩形鋼管的空翼緣梁、上下翼緣均換成矩形鋼管的空翼緣梁等等。由于該類截面用封閉鋼管翼緣替換原來的翼緣板,整個(gè)結(jié)構(gòu)的抗扭剛度得到了顯著地提高,具有更好的受力性能。本文研究的是一種新型的鋼管混凝土翼緣工字形梁。通過在鋼管中澆筑混凝土,使鋼管空翼緣梁易被局部壓曲的缺點(diǎn)得到改善,進(jìn)一步提高了構(gòu)件的受力性能。但由于截面形式的復(fù)雜性、扭轉(zhuǎn)試驗(yàn)對(duì)邊界條件及加載條件所需的特殊要求等原因,相關(guān)的約束扭轉(zhuǎn)試驗(yàn)尚未見報(bào)道。因此,本課題采用試驗(yàn)的研究方法并結(jié)合有限元分析,對(duì)單跨矩形鋼管混凝土翼緣工字形梁的約束扭轉(zhuǎn)力學(xué)性能進(jìn)行了分析研究。本文主要研究?jī)?nèi)容有:(1)開展了三根矩形鋼管混凝土翼緣工字形梁約束扭轉(zhuǎn)力學(xué)性能試驗(yàn)。此外,設(shè)計(jì)了1套用于約束扭轉(zhuǎn)試驗(yàn)的夾支座及約束扭轉(zhuǎn)加載裝置,并通過工字形鋼梁的約束扭轉(zhuǎn)試驗(yàn)初步驗(yàn)證了此套試驗(yàn)裝置的可靠性。(2)詳細(xì)記錄了三根試驗(yàn)梁在試驗(yàn)過程中的試驗(yàn)現(xiàn)象和試驗(yàn)數(shù)據(jù),繪制了荷載—應(yīng)變曲線及轉(zhuǎn)角—扭矩的關(guān)系曲線。對(duì)試驗(yàn)結(jié)果進(jìn)行了分析,揭示矩形鋼管混凝土翼緣工字形梁發(fā)生約束扭轉(zhuǎn)變形時(shí)的力學(xué)特性。(3)應(yīng)用ANSYS有限元軟件,建立了矩形鋼管混凝土翼緣工字形梁有限元模型,并對(duì)有限元模型的正確性進(jìn)行了驗(yàn)證。對(duì)試驗(yàn)梁有限元模型進(jìn)行約束扭轉(zhuǎn)分析,將分析結(jié)果與試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析。基于ANSYS有限元模型,分析研究了鋼管翼緣高寬比、混凝土強(qiáng)度、材料等級(jí)等因素對(duì)矩形鋼管混凝土翼緣工字形梁約束扭轉(zhuǎn)力學(xué)性能的影響。
[Abstract]:With the increasing tendency of civil engineering structures to long span, towering, complex and convenient construction, the existing building materials also need to be developed and optimized accordingly, in order to meet the construction requirements of modern engineering structures. Although the traditional I-shaped steel beam has the advantages of high strength and light weight, it is often not able to give full play to its high strength due to its lack of stability. Therefore, an I-shaped beam with empty steel tube flange appears. This type of beam is formed by replacing the upper and lower flange of the traditional I-shaped steel beam with steel tubes of various sections, such as replacing the upper and lower flange with the hollow flange beam of the triangular steel pipe, and replacing the upper flange with the hollow flange beam of the rectangular steel pipe. Upper and lower flange are replaced by rectangular steel tube blank flange beam and so on. The torsional stiffness of the whole structure has been significantly improved because the flange plate was replaced by the flange of the closed steel tube in this kind of section and the mechanical performance of the whole structure was better. In this paper, a new type of steel tube concrete flange I-shaped beam is studied. By pouring concrete into the steel tube, the defect that the steel tube blank flange beam is easily subjected to local compression is improved, and the mechanical properties of the members are further improved. However, due to the complexity of section form and the special requirements of torsion test for boundary conditions and loading conditions, the relevant constrained torsion tests have not been reported. Therefore, in this paper, the restrained torsional mechanical properties of single-span rectangular steel tube concrete filled steel tube flange I-shaped beams are studied by means of experimental research and finite element analysis. The main contents of this paper are as follows: (1) three concrete filled rectangular steel tube flange I-shaped beams have been tested on the restrained torsional mechanical properties. In addition, a set of clamping supports and a constrained torsion loading device are designed for restrained torsion test. The reliability of the test device is preliminarily verified by the restrained torsion test of I-shaped steel beams. (2) the experimental phenomena and test data of three test beams during the test are recorded in detail. The load-strain curve and the curve between angle and torque are plotted. The experimental results are analyzed to reveal the mechanical characteristics of rectangular concrete-filled steel tube flange I-shaped beam under constrained torsional deformation. (3) the finite element model of rectangular steel tubular concrete flange I-shaped beam is established by using ANSYS finite element software. The correctness of the finite element model is verified. The finite element model of the test beam is analyzed by the constraint torsion analysis, and the results are compared with the test results. Based on the ANSYS finite element model, the effects of the ratio of height to width of steel tube flange, concrete strength and material grade on the restrained torsional mechanical properties of rectangular steel tube concrete flange I-shaped beam are studied.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.9
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本文編號(hào)：2247309