本文關(guān)鍵詞：基于統(tǒng)一理論的矩形鋼管混凝土構(gòu)件性能研究　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 統(tǒng)一理論 矩形鋼管混凝土 強(qiáng)度承載力 穩(wěn)定承載力 抗彎承載力

【摘要】：由于矩形鋼管混凝土構(gòu)件具有外形美觀、與梁節(jié)點(diǎn)構(gòu)造簡單方便、能夠有效地提高延性、能夠提供有力的強(qiáng)弱軸等優(yōu)點(diǎn),在工程中得到利用的機(jī)會(huì)越來越多,對其也有了越來越深的探討。不過現(xiàn)在統(tǒng)一理論的研究主要是圓形截面和方形截面構(gòu)件,對于長寬比較大的矩形構(gòu)件的研究較少。而且由于目前已有理論對長寬比較大的矩形鋼管混凝土的套箍效應(yīng)考慮不夠準(zhǔn)確,所以長寬比較大的矩形鋼管混凝土需要進(jìn)行深入研究。通過靜力分析得到了矩形鋼管混凝土的鋼管的環(huán)向受力和核心混凝土受側(cè)壓力區(qū)分布規(guī)律。然后根據(jù)核心混凝土有限元模型和受力分析,假設(shè)了核心混凝土區(qū)域的拋物線方程,推導(dǎo)出核心混凝土受套箍效應(yīng)的面積。而且在方形鋼管混凝土軸壓構(gòu)件強(qiáng)度承載力公式的基礎(chǔ)上,通過假設(shè)套箍效應(yīng)影響系數(shù),最終得到適用于矩形鋼管混凝土軸壓短柱強(qiáng)度承載力的實(shí)用公式�？紤]管內(nèi)混凝土對鋼管穩(wěn)定性能的有利影響,利用數(shù)據(jù)庫的試驗(yàn)結(jié)果回歸得到更加經(jīng)濟(jì)的穩(wěn)定系數(shù)公式,并利用修正后的軸壓強(qiáng)度承載力公式,得到矩形鋼管混凝土長柱的穩(wěn)定承載力公式,并用試驗(yàn)數(shù)據(jù)對得到的公式進(jìn)行了驗(yàn)證。在統(tǒng)一理論的基礎(chǔ)上,根據(jù)極限平衡理論,分別得到矩形鋼管混凝土繞長軸和短軸彎曲的極限抗彎承載力計(jì)算公式。然后在已有的方形鋼管混凝土抗彎承載力計(jì)算公式的基礎(chǔ)上通過公式擬合,得出適合于長寬比較大的矩形鋼管混凝土抗彎承載力實(shí)用公式。在統(tǒng)一理論的指導(dǎo)下,利用已推導(dǎo)出的穩(wěn)定承載力公式和抗彎承載力公式,通過對矩形規(guī)程中相關(guān)方程的修改,得到了矩形鋼管混凝土壓彎構(gòu)件相關(guān)方程。通過國際組合結(jié)構(gòu)協(xié)會(huì)公布統(tǒng)計(jì)的試驗(yàn)數(shù)據(jù)庫和歐洲規(guī)范4來驗(yàn)證鋼管混凝土結(jié)構(gòu)統(tǒng)一理論,驗(yàn)證表明統(tǒng)一理論對于長寬比大于1.5的矩形鋼管混凝土構(gòu)件不夠準(zhǔn)確,對于長寬比較小的構(gòu)件的誤差較小。并利用數(shù)據(jù)庫的試驗(yàn)數(shù)據(jù)對本文推導(dǎo)出的矩形鋼管混凝土軸壓短柱強(qiáng)度承載力公式、長柱穩(wěn)定承載力公式、壓彎相關(guān)方程都進(jìn)行了驗(yàn)證,證明了各個(gè)公式的正確性。
[Abstract]:Because the rectangular concrete-filled steel tube members have the advantages of beautiful appearance, simple and convenient construction with the beam joint, can effectively improve the ductility, can provide a strong and weak axis, and so on, it has more and more opportunities to be used in engineering. It has also been discussed more and more deeply, but now the research of unified theory is mainly about circular section and square section. There is little research on rectangular members with large length and width, and the current theory is not accurate enough to consider the hoop effect of rectangular concrete-filled steel tube with large length and width. Therefore, the concrete filled rectangular steel tubes with large length and width need to be studied deeply. Through the static analysis, the circular force and the distribution of the core concrete under lateral pressure are obtained, and then according to the core of the concrete filled steel tube, the distribution of the concrete in the concrete filled rectangular steel tube is obtained. Finite element model and stress analysis of concrete. The parabola equation of the core concrete region is assumed, and the area of the core concrete subjected to hoop effect is deduced, and the strength bearing capacity formula of the square concrete-filled steel tube members under axial compression is derived. By assuming the influence coefficient of hoop effect, a practical formula for the strength bearing capacity of rectangular concrete-filled steel tubular columns under axial compression is obtained, and the favorable influence of concrete in pipe on the stability of steel tube is considered. A more economical formula of stability coefficient is obtained by regression of the test results of the database, and the formula of stability bearing capacity of rectangular concrete-filled steel tubular columns is obtained by using the modified formula of axial compression strength bearing capacity. The formula is verified by the experimental data. Based on the unified theory, the limit equilibrium theory is used. The calculation formulas of ultimate flexural capacity of concrete filled rectangular steel tube (CFST) around long axis and short axis are obtained respectively. Then the formula is fitted on the basis of the existing formulas for calculating the flexural capacity of concrete filled rectangular steel tube (CFST). A practical formula for bending bearing capacity of concrete filled rectangular steel tubes with large length and width is obtained. Under the guidance of the unified theory, the formula of stable bearing capacity and the formula of bending bearing capacity have been derived. By modifying the relevant equations in the rectangular rules. The relevant equations of concrete-filled rectangular steel tubular members are obtained. The unified theory of concrete-filled steel tubular structures is verified by the test database published by the International Association of Composite structures and European Code 4. The results show that the unified theory is not accurate for concrete filled rectangular steel tube members whose aspect ratio is greater than 1.5. For the members with small length and width, the error is small, and the formula of strength bearing capacity of rectangular concrete-filled steel tubular columns under axial compression, and the formula of stability bearing capacity of long columns are deduced by using the test data of the database. The relevant equations of compression and bending are verified, and the correctness of each formula is proved.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU398.9

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本文編號：1370672