發(fā)布時(shí)間：2018-07-01 11:03

  本文選題：雙鋼板-混凝土結(jié)構(gòu) + 面外受力性能��； 參考：《清華大學(xué)》2015年博士論文

【摘要】：雙鋼板-混凝土結(jié)構(gòu)是一種采用鋼板代替受力鋼筋,將鋼板外包于混凝土而形成的組合結(jié)構(gòu)。與鋼筋混凝土結(jié)構(gòu)相比,雙鋼板-混凝土結(jié)構(gòu)施工方便,同時(shí)兼具良好的受力性能和抗沖擊性能,因而在我國(guó)第三代核電機(jī)組安全殼的設(shè)計(jì)中得到應(yīng)用。目前我國(guó)關(guān)于此類(lèi)結(jié)構(gòu)的研究較少,設(shè)計(jì)方法也尚不明確。本文通過(guò)基本構(gòu)件試驗(yàn),對(duì)雙鋼板-混凝土結(jié)構(gòu)的面外受力機(jī)理、滯回特性以及表面鋼板的屈曲性能進(jìn)行了研究,在此基礎(chǔ)上建立了安全殼的整體有限元分析模型,通過(guò)數(shù)值計(jì)算對(duì)其抗震安全性能進(jìn)行評(píng)估。主要工作和研究成果包括:(1)進(jìn)行了7個(gè)鋼板-混凝土組合板的面外靜力加載試驗(yàn)。分析了鋼板配置、抗剪連接程度及鋼板厚度對(duì)組合板面外受力性能的影響。結(jié)果表明試件按完全抗剪連接設(shè)計(jì)時(shí),受力機(jī)制與鋼筋混凝土相似,但在鋼板與混凝土的交界面會(huì)產(chǎn)生滑移效應(yīng)。雙鋼板-混凝土試件的受壓區(qū)鋼板還會(huì)發(fā)生局部屈曲現(xiàn)象。(2)進(jìn)行了3個(gè)雙鋼板-混凝土組合懸臂墻的面外擬靜力加載縮尺試驗(yàn)。通過(guò)改變剪跨比和鋼板厚度,得到了試件在不同破壞模式下的受力機(jī)理和滯回特性,驗(yàn)證了原型結(jié)構(gòu)中距厚比取值的合理性和對(duì)拉鋼筋對(duì)于試件面外抗剪的貢獻(xiàn)。(3)采用一種分離式分層殼單元對(duì)組合板靜力加載試驗(yàn)進(jìn)行了有限元模擬,模型能夠真實(shí)反映鋼板和混凝土之間的界面滑移行為,計(jì)算結(jié)果與試驗(yàn)吻合良好。在此基礎(chǔ)上,結(jié)合試驗(yàn)結(jié)果與有限元分析,給出了鋼板-混凝土結(jié)構(gòu)面外承載力和剛度的計(jì)算公式。(4)進(jìn)行了10個(gè)雙鋼板-混凝土組合墻的軸壓試驗(yàn)。分析了距厚比、鋼板厚度以及栓釘布置形式對(duì)試件表面鋼板屈曲性能的影響。根據(jù)本文的試驗(yàn)結(jié)果,同時(shí)結(jié)合國(guó)內(nèi)外現(xiàn)有的試驗(yàn)數(shù)據(jù),給出了表面鋼板距厚比限值的計(jì)算公式。(5)對(duì)軸壓試驗(yàn)進(jìn)行了有限元模擬,考慮了混凝土對(duì)鋼板的單邊約束效應(yīng)以及栓釘?shù)腻^固變形和滑移效應(yīng)。通過(guò)有限元的補(bǔ)充分析,量化了栓釘錨固剛度、距厚比以及鋼板初始缺陷對(duì)于鋼板屈曲應(yīng)力的影響,驗(yàn)證了所建議的距厚比限值公式的合理性。最后分析了栓釘布置形式影響鋼板屈曲性能的深層次原因。(6)根據(jù)試驗(yàn)結(jié)果,校核了某安全殼雙鋼板-混凝土部分的設(shè)計(jì)參數(shù),采用分層殼單元對(duì)整體結(jié)構(gòu)建立了有限元分析模型,通過(guò)彈塑性動(dòng)力時(shí)程分析,得到了結(jié)構(gòu)在特大地震作用下的內(nèi)力、變形和薄弱位置,對(duì)其抗震裕度進(jìn)行了分析。
[Abstract]:Double steel plate-concrete structure is a kind of composite structure, which uses steel plate instead of steel bar and covers steel plate in concrete. Compared with the reinforced concrete structure, the double-plate-concrete structure is easy to construct, and has good mechanical performance and impact resistance, so it has been applied in the design of the third generation nuclear power unit containment in China. At present, there are few researches on this kind of structure in our country, and the design method is not clear. In this paper, the stress mechanism, hysteretic characteristics and buckling behavior of double steel plate-concrete structures are studied by means of basic component tests. Based on this, the integral finite element analysis model of containment is established. Its seismic safety performance is evaluated by numerical calculation. The main work and research results are as follows: (1) the outside static loading tests of 7 steel plate-concrete composite slabs are carried out. The influence of steel plate configuration, shear connection degree and steel plate thickness on the external mechanical properties of composite plate is analyzed. The results show that the mechanical mechanism of the specimens is similar to that of reinforced concrete, but the slip effect will occur at the interface between steel plate and concrete. The local buckling of the steel plate in the compression zone of the double-steel plate concrete specimen is also observed. (2) the pseudo-static compression scale tests of three double-plate-concrete composite cantilever walls are carried out. By changing the shear span ratio and the thickness of the steel plate, the mechanical mechanism and hysteretic characteristics of the specimens under different failure modes are obtained. The rationality of the distance to thickness ratio in the prototype structure and the contribution of the tensile steel bar to the out-of-plane shear resistance of the specimen are verified. (3) the static loading test of the composite plate is simulated by a separate layered shell element. The model can truly reflect the interface slip behavior between steel plate and concrete, and the calculated results are in good agreement with the test results. On this basis, combined with the experimental results and finite element analysis, the calculation formulas for the out-of-plane bearing capacity and stiffness of plate-concrete structures are given. (4) the axial compression tests of 10 double-plate-concrete composite walls are carried out. The effects of distance thickness ratio, steel plate thickness and pin arrangement on the buckling properties of steel plate on the surface of the specimen were analyzed. Based on the experimental results of this paper and the existing test data at home and abroad, the calculation formula of the limit value of the thickness ratio of the surface steel plate is given. (5) the axial compression test is simulated by finite element method. The single side restraint effect of concrete on steel plate and anchoring deformation and slip effect of bolt are considered. Through the supplementary analysis of finite element, the influences of anchoring stiffness, ratio of distance to thickness and initial defect of steel plate on the buckling stress of steel plate are quantified, and the rationality of the suggested formula of the limit value of distance to thickness ratio is verified. Finally, the deep reasons for the influence of pin layout on the buckling behavior of steel plate are analyzed. (6) based on the experimental results, the design parameters of the double-plate-concrete part of a containment are checked. The finite element analysis model of the whole structure is established by using the layered shell element, and the internal force, deformation and weak position of the structure under the action of a large earthquake are obtained through the elastoplastic dynamic time history analysis, and its seismic margin is analyzed.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU398.9;TU352.11

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