發(fā)布時(shí)間：2018-08-24 07:39

【摘要】：高強(qiáng)混凝土具有孔隙率低、密度大和抗壓強(qiáng)度高等優(yōu)點(diǎn)。然而隨著高強(qiáng)混凝土的強(qiáng)度增加，其脆性迅速增加，如何在克服其脆性的情況下，最大限度的利用高強(qiáng)混凝土的優(yōu)點(diǎn)，一直是比較熱門的研究課題，本文應(yīng)用的鋼管高強(qiáng)混凝土結(jié)構(gòu)形式，避免了高強(qiáng)混凝土的脆性，充分發(fā)揮了高強(qiáng)混凝土的優(yōu)點(diǎn)。預(yù)應(yīng)力鋼管高強(qiáng)混凝土管，是空心鋼管高強(qiáng)混凝土結(jié)構(gòu)的一種特殊形式，其充分利用了高強(qiáng)混凝土的優(yōu)點(diǎn)，主要用于輸送液體。 目前國內(nèi)外不少學(xué)者對高強(qiáng)混凝土的本構(gòu)關(guān)系做了大量的試驗(yàn)研究，并且給出了高強(qiáng)混凝土比較完整的軸心受壓本構(gòu)關(guān)系式；國內(nèi)外不少學(xué)者對鋼管高強(qiáng)混凝土的靜力性能進(jìn)行了試驗(yàn)研究，但都沒有給出鋼管高強(qiáng)混凝土靜承載力的統(tǒng)一理論設(shè)計(jì)公式；且對鋼管高強(qiáng)混凝土的動力性能研究也比較少，都沒有給出鋼管高強(qiáng)混凝土的延性系數(shù)計(jì)算方法；國內(nèi)外很多學(xué)者對預(yù)應(yīng)力鋼管高強(qiáng)混凝土管也做了大量的研究，但是給出的計(jì)算方法都是基于彈性體系設(shè)計(jì)準(zhǔn)則，沒有給出其塑性彎矩重分布的理論內(nèi)容。本文針對以上情況，作了如下研究： 應(yīng)用本文引用的高強(qiáng)混凝土本構(gòu)關(guān)系，利用ABAQUS有限元軟件對鋼管高強(qiáng)混凝土構(gòu)件的靜力性能進(jìn)行了模擬，由模擬結(jié)果與試驗(yàn)結(jié)果吻合良好，證明了模型的正確性和可行性，，確定了高強(qiáng)混凝土在有限元建模中正確的本構(gòu)關(guān)系和正確的參數(shù)。鋼管混凝土的靜承載力只與混凝土的峰值應(yīng)力有關(guān)，因此本文認(rèn)為鋼管高強(qiáng)混凝土的靜力設(shè)計(jì)理論完全可以使用普通鋼管混凝土的靜力設(shè)計(jì)理論。在此基礎(chǔ)上，本文應(yīng)用普通鋼管混凝土的靜承載力計(jì)算公式對鋼管高強(qiáng)混凝土軸壓短柱、軸壓長柱和抗彎構(gòu)件進(jìn)行了計(jì)算，得到計(jì)算值、試驗(yàn)值和模擬值吻合良好。 根據(jù)數(shù)值分析法和極限平衡理論進(jìn)行了鋼管高強(qiáng)混凝土壓彎構(gòu)件滯回性能的分析，修正了普通鋼管混凝土壓彎構(gòu)件荷載-位移曲線的骨架曲線模型，并且計(jì)算了鋼管高強(qiáng)混凝土壓彎構(gòu)件的位移延性系數(shù)。 系統(tǒng)地介紹了作用在預(yù)應(yīng)力鋼管高強(qiáng)混凝土管上的荷載類型，給出了主要荷載的計(jì)算方法和計(jì)算公式。給出了在荷載和內(nèi)壓作用下，管道截面軸力和彎矩的計(jì)算方法。通過極限軸力和極限彎矩控制，給出了控制截面塑性彎矩重分布的計(jì)算理論。通過實(shí)例計(jì)算和有限元模擬，驗(yàn)證了理論的正確性和可行性。
[Abstract]:High strength concrete has the advantages of low porosity, high density and high compressive strength. However, with the increase of strength and brittleness of high strength concrete, how to make the best use of the advantages of high strength concrete under the condition of overcoming its brittleness has always been a hot research topic. The structural form of high strength concrete filled steel tube in this paper avoids the brittleness of high strength concrete and gives full play to the advantages of high strength concrete. Prestressed steel tube high strength concrete pipe is a special form of hollow steel tube high strength concrete structure. It makes full use of the advantages of high strength concrete and is mainly used to transport liquid. At present, many scholars at home and abroad have done a lot of experimental research on the constitutive relation of high strength concrete, and give a relatively complete constitutive equation of high strength concrete under axial compression. Many scholars at home and abroad have studied the static behavior of high strength concrete filled steel tube (HSC), but have not given the unified theoretical design formula of the static bearing capacity of HSC, and the research on the dynamic performance of HSC is less. Many scholars at home and abroad have also done a lot of research on the prestressed high strength concrete filled steel tube pipe, but the calculation method is based on the design criteria of elastic system. The theoretical content of the plastic moment redistribution is not given. In this paper, the following studies have been done: using the constitutive relation of high strength concrete quoted in this paper, the static behavior of high strength concrete filled steel tube members has been simulated by using ABAQUS finite element software. The simulation results are in good agreement with the experimental results, which proves the correctness and feasibility of the model, and determines the correct constitutive relation and the correct parameters in the finite element modeling of high strength concrete. The static bearing capacity of concrete filled steel tube is only related to the peak stress of concrete, so the static design theory of high strength concrete filled steel tube can be fully used in the static design theory of ordinary concrete filled steel tube. On this basis, the static bearing capacity formula of ordinary concrete filled steel tube is applied to calculate the axial compression short column, axial compression long column and flexural member of high strength concrete filled steel tube. The calculated values are in good agreement with the simulated values. Based on numerical analysis and limit equilibrium theory, the hysteretic behavior of high strength concrete filled steel tubular members is analyzed, and the skeleton curve model of load-displacement curve of ordinary concrete-filled steel tubular members is modified. The displacement ductility coefficient of high strength concrete filled steel tube members is calculated. The load types acting on prestressed steel tube high strength concrete pipe are systematically introduced, and the calculation methods and formulas of main loads are given. The calculation method of axial force and bending moment of pipeline section under load and internal pressure is given. Through the control of ultimate axial force and ultimate bending moment, the calculation theory of controlling plastic moment redistribution of section is presented. The correctness and feasibility of the theory are verified by example calculation and finite element simulation.
【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】：2013
【分類號】：TU398.9

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