本文關(guān)鍵詞：高強(qiáng)度結(jié)構(gòu)鋼材材料設(shè)計(jì)指標(biāo)研究　出處：《清華大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 高強(qiáng)鋼 GJ鋼 可靠度 抗力分項(xiàng)系數(shù) 本構(gòu)模型

【摘要】：高強(qiáng)度結(jié)構(gòu)鋼材以其良好的力學(xué)性能和可加工性能,已經(jīng)逐步開(kāi)始在建筑結(jié)構(gòu)和橋梁結(jié)構(gòu)中得到應(yīng)用。已有的研究表明,高強(qiáng)鋼結(jié)構(gòu)構(gòu)件的受力性能與普通鋼材構(gòu)件存在一定的差異,因而相應(yīng)的設(shè)計(jì)方法發(fā)生了改變。目前,我國(guó)新修訂的鋼結(jié)構(gòu)設(shè)計(jì)規(guī)范已經(jīng)給出了460MPa強(qiáng)度級(jí)別鋼材的抗力分項(xiàng)系數(shù)和強(qiáng)度設(shè)計(jì)值,但更高強(qiáng)度級(jí)別鋼材的設(shè)計(jì)指標(biāo)還沒(méi)有提出。同時(shí),國(guó)產(chǎn)的GJ系列鋼材也在結(jié)構(gòu)工程中有了很多應(yīng)用,但目前相關(guān)設(shè)計(jì)規(guī)范中只有Q345GJ鋼的設(shè)計(jì)指標(biāo)。本文以《高強(qiáng)鋼結(jié)構(gòu)設(shè)計(jì)規(guī)程》的編制為背景,通過(guò)試驗(yàn)研究、數(shù)值模擬和理論分析等方法研究了不同等級(jí)的高強(qiáng)度結(jié)構(gòu)鋼材和GJ系列鋼材的可靠度,計(jì)算了其強(qiáng)度設(shè)計(jì)指標(biāo),同時(shí)研究了高強(qiáng)度結(jié)構(gòu)鋼材在單調(diào)荷載作用下的本構(gòu)模型。主要包括以下內(nèi)容:(1)調(diào)研收集了高強(qiáng)度結(jié)構(gòu)鋼材(Q500、Q550和Q690)材料力學(xué)性能數(shù)據(jù)11638組和GJ系列鋼材(Q390GJ、Q420GJ和Q460GJ)數(shù)據(jù)2912組。對(duì)高強(qiáng)鋼和GJ鋼開(kāi)展獨(dú)立的材性試驗(yàn)79組。同時(shí)開(kāi)展了加載速率和試驗(yàn)機(jī)柔度對(duì)高強(qiáng)鋼屈服強(qiáng)度影響的試驗(yàn)。利用數(shù)理統(tǒng)計(jì)方法,綜合考慮上述調(diào)研和試驗(yàn)數(shù)據(jù),得到了高強(qiáng)鋼和GJ鋼材料性能不定性的統(tǒng)計(jì)參數(shù)。(2)利用通用有限元軟件ABAQUS建立有限元模型,經(jīng)已有試驗(yàn)數(shù)據(jù)驗(yàn)證后,計(jì)算了高強(qiáng)度鋼材(Q500、Q550、Q620和Q690)焊接截面壓彎構(gòu)件彎矩作用平面內(nèi)的極限承載力880組、受彎構(gòu)件整體穩(wěn)定承載力460組。通過(guò)已有研究的數(shù)據(jù)、數(shù)值模擬的數(shù)據(jù)和規(guī)范公式計(jì)算值的比較,計(jì)算得到了高強(qiáng)鋼軸心受壓構(gòu)件、壓彎構(gòu)件和受彎構(gòu)件的計(jì)算模式不定性的統(tǒng)計(jì)參數(shù)。(3)基于上述結(jié)果和已有研究數(shù)據(jù),采用可靠度理論中的一次二階矩法,通過(guò)數(shù)學(xué)軟件Matlab編制程序,提出了高強(qiáng)度結(jié)構(gòu)鋼材和GJ系列鋼材的抗力分項(xiàng)系數(shù)建議值,并對(duì)其進(jìn)行了可靠度校核分析。(4)總結(jié)已有研究中高強(qiáng)度結(jié)構(gòu)鋼材的材性數(shù)據(jù),并利用開(kāi)展的高強(qiáng)鋼材性試驗(yàn)獲得的數(shù)據(jù),更新了高強(qiáng)鋼多折線本構(gòu)模型的參數(shù),以Ramberg-Osgood模型為基礎(chǔ)標(biāo)定了適用于高強(qiáng)鋼的非線性本構(gòu)模型,同時(shí)提出了修正的高強(qiáng)鋼多折線本構(gòu)模型。
[Abstract]:Because of its good mechanical properties and machinability, high strength structural steels have been gradually applied in building structures and bridge structures. The mechanical behavior of high strength steel structure members is different from that of ordinary steel members, so the corresponding design method has been changed. The new revised steel structure design code in China has given the resistance factor and strength design value of 460MPa strength grade steel, but the design index of higher strength grade steel has not been put forward. Domestic GJ series steels have been widely used in structural engineering, but only Q345GJ steel is used in the relevant design code. The background of this paper is the compilation of structural design rules for high strength steel. Through experimental research, numerical simulation and theoretical analysis, the reliability of high strength structural steels and GJ series steels of different grades are studied, and the strength design indexes are calculated. At the same time, the constitutive model of high strength structural steel under monotonic load is studied. Q550 and Q690) material mechanical properties data 11638 groups and GJ series steel Q390GJ. Q420GJ and Q460GJ). Data 2912 groups. 79 groups of independent tests on high strength steel and GJ steel were carried out. At the same time, the effect of loading rate and machine flexibility on yield strength of high strength steel was tested. The statistical parameters of high strength steel and GJ steel with uncertain properties are obtained by considering the above investigation and test data. The finite element model is established by using the general finite element software ABAQUS. After being verified by experimental data, 880 groups of ultimate bearing capacity of high strength steel Q500 Q550Q620 and Q690) in the bending moment plane are calculated. The overall stability bearing capacity of the flexural members is 460 groups. Through the comparison of the existing data, numerical simulation data and the calculated values of the standard formula, the axial compression members of high strength steel are calculated. Based on the above results and existing research data, the first-order second-order moment method of reliability theory is used. Based on the program of Matlab, the suggested values of resistance coefficient of high strength structural steel and GJ series steel are put forward. And the reliability check analysis. 4) summarize the data of high strength structural steel in the existing research, and use the data obtained from the high strength steel property test. The parameters of the multifold constitutive model of high strength steel were updated and the nonlinear constitutive model suitable for high strength steel was calibrated based on Ramberg-Osgood model. At the same time, a modified multi-fold constitutive model of high-strength steel is proposed.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU511.3
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本文編號(hào)：1400318