發(fā)布時(shí)間：2018-08-19 17:17

【摘要】：鋼管結(jié)構(gòu)被廣泛的運(yùn)用于社會的各個(gè)方面,在使用的過程中結(jié)構(gòu)因?yàn)樵馐芨鞣N疲勞荷載的作用,將會引起疲勞破壞,嚴(yán)重時(shí)造成巨大的工程事故。以往只考慮鋼管結(jié)構(gòu)的承載力設(shè)計(jì)將會不足,還需要對鋼管結(jié)構(gòu)的疲勞壽命進(jìn)行復(fù)核。相貫節(jié)點(diǎn)是鋼管結(jié)構(gòu)常用的節(jié)點(diǎn)形式,其種類特別豐富,包括圓鋼管相貫節(jié)點(diǎn)、方鋼管相貫節(jié)點(diǎn)、組合截面管節(jié)點(diǎn)等。以往對于圓鋼管和方鋼管相貫節(jié)點(diǎn)疲勞特性的研究較多,而對于組合截面相貫節(jié)點(diǎn)的研究較少。本文采用多種焊接結(jié)構(gòu)疲勞分析方法,對典型的圓管及圓管-方管相貫節(jié)點(diǎn)的疲勞特性進(jìn)行了分析,為工程應(yīng)用做參考。主要內(nèi)容如下:(1)系統(tǒng)的介紹了焊接結(jié)構(gòu)疲勞分析方法理論,分別有熱點(diǎn)應(yīng)力法、有效切口應(yīng)力法、局部應(yīng)力應(yīng)變法。(2)驗(yàn)證了用數(shù)值方法進(jìn)行熱點(diǎn)應(yīng)力分析的可靠性,詳細(xì)的分析了N型圓管相貫節(jié)點(diǎn)在平衡軸力作用下的支管和主管熱點(diǎn)應(yīng)力集中系數(shù)(SCF)隨幾何參數(shù)的變化規(guī)律,得到了相應(yīng)節(jié)點(diǎn)SCF的參數(shù)公式。(3)對軸力作用下Y型方圓相貫節(jié)點(diǎn)熱點(diǎn)應(yīng)力集中系數(shù)(SCF)進(jìn)行了分析,得到了相貫節(jié)點(diǎn)SCF的變化規(guī)律和相應(yīng)的參數(shù)公式。(4)對平衡軸力作用下的K型方圓相貫節(jié)點(diǎn)的應(yīng)力集中系數(shù)(SCF)進(jìn)行了分析,得到了相貫節(jié)點(diǎn)相應(yīng)的SCF變化規(guī)律和參數(shù)公式。(5)采用有效切口應(yīng)力法對軸力作用下的T型方圓相貫節(jié)點(diǎn)進(jìn)行分析,驗(yàn)證了有效切口應(yīng)力法評價(jià)相貫節(jié)點(diǎn)疲勞的可行性,得到了軸力作用下T型方圓相貫節(jié)點(diǎn)的切口應(yīng)力集中系數(shù)參數(shù)公式。同時(shí)將有效切口應(yīng)力法計(jì)算的相貫節(jié)點(diǎn)壽命與熱點(diǎn)應(yīng)力法進(jìn)行了比較,符合良好。(6)采用局部應(yīng)力應(yīng)變法對軸力作用下的T型方圓相貫節(jié)點(diǎn)進(jìn)行分析,通過修正的Neuber法計(jì)算節(jié)點(diǎn)的局部應(yīng)力應(yīng)變,所得的壽命與試驗(yàn)比較符合。
[Abstract]:Steel pipe structure is widely used in all aspects of society. In the process of use, the structure will be subjected to various fatigue loads, which will cause fatigue damage, and cause a huge engineering accident. In the past, the design of bearing capacity of steel pipe structure would be insufficient, and the fatigue life of steel pipe structure should be checked. Intersected joints are commonly used in steel pipe structures, which include circular steel pipe joints, square steel pipe joints, composite section pipe joints and so on. In the past, the fatigue characteristics of circular steel pipe and square steel pipe intersected joints were studied more, but the research of composite cross section joints was less. In this paper, fatigue characteristics of typical circular pipe and tubular / square tubular joints are analyzed by using various fatigue analysis methods of welded structures, which can be used as a reference for engineering application. The main contents are as follows: (1) the theory of fatigue analysis method for welded structures is introduced systematically, which includes hot spot stress method, effective notch stress method and local stress strain method. (2) the reliability of hot spot stress analysis by numerical method is verified. The variation law of stress concentration factor (SCF) of branch pipe and hot spot of N type circular pipe under balanced axial force with geometric parameters is analyzed in detail. The parameter formula of the corresponding node SCF is obtained. (3) the stress concentration factor (SCF) of Y-shaped circular intersecting joints is analyzed under axial force. The variation law of SCF and the corresponding parameter formula are obtained. (4) the stress concentration factor (SCF) of K-type circular intersecting joints under equilibrium axial force is analyzed. The corresponding SCF variation law and parameter formula of intersecting joints are obtained. (5) the effective notch stress method is used to analyze the T-shaped circular intersected joints under axial force, which verifies the feasibility of the effective notch stress method in evaluating fatigue of intersected joints. The parameter formula of notch stress concentration factor for T-shaped circular intersecting joints under axial force is obtained. At the same time, the life of intersected joints calculated by effective notch stress method is compared with that of hot spot stress method. (6) A local stress-strain method is used to analyze T-shaped circular intersected joints under axial force. The local stress and strain of the joints are calculated by the modified Neuber method, and the obtained life is in good agreement with the test.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU392.3

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本文編號：2192310