本文選題：鋼桁架+傘撐結(jié)構(gòu) + 地震反應(yīng)分析　； 參考：《西安建筑科技大學(xué)》2013年碩士論文

【摘要】：1000MW機(jī)組較之300MW、600MW機(jī)組時(shí)空冷支架結(jié)構(gòu)體系總高增大、設(shè)備荷重增加，地震反應(yīng)和風(fēng)致效應(yīng)增大。如果在高烈度地區(qū)仍采用傳統(tǒng)的鋼桁架+鋼筋混凝土管柱結(jié)構(gòu)體系，將會(huì)出現(xiàn)懸挑端的豎向位移和結(jié)構(gòu)的水平側(cè)移較大，難于滿(mǎn)足現(xiàn)行規(guī)范和空冷工藝的要求。本文基于鋼桁架+大尺寸鋼筋混凝土管柱、鋼桁架+傘撐式鋼筋混凝土管柱兩種空冷結(jié)構(gòu)擬動(dòng)力、擬靜力試驗(yàn)和鋼桁架+大尺寸鋼筋混凝土管柱、魚(yú)腹式鋼桁架+大尺寸鋼筋混凝土管柱、鋼桁架+傘撐式鋼筋混凝土管柱三種空冷結(jié)構(gòu)體系，通過(guò)豎向荷載、風(fēng)荷載下體系受力性能分析和體系地震作用反應(yīng)分析及空冷支架結(jié)構(gòu)體系抗震性能試驗(yàn)分析，提出了高烈度區(qū)滿(mǎn)足抗震性能要求的1000MW機(jī)組時(shí)空冷結(jié)構(gòu)體系的適用型式。 （1）采用SAP2000有限元軟件建立空冷支架結(jié)構(gòu)有限元模型。對(duì)鋼桁架+大尺寸鋼筋混凝土管柱結(jié)構(gòu)、魚(yú)腹式鋼桁架+大尺寸鋼筋混凝土管柱結(jié)構(gòu)和鋼桁架+傘撐式鋼筋混凝土管柱結(jié)構(gòu)在豎向荷載、風(fēng)荷載和地震作用下的受力性能以及結(jié)構(gòu)的動(dòng)力特性進(jìn)行分析，，研究三個(gè)結(jié)構(gòu)的桿件內(nèi)力和整體位移變化情況。 （2）對(duì)鋼桁架+大尺寸鋼筋混凝土管柱結(jié)構(gòu)和鋼桁架+傘撐式鋼筋混凝土管柱結(jié)構(gòu)進(jìn)行模型結(jié)構(gòu)擬動(dòng)力和擬靜力試驗(yàn)，觀察和分析結(jié)構(gòu)的破壞過(guò)程、構(gòu)件的受力特點(diǎn)和結(jié)構(gòu)的薄弱部位等。從試驗(yàn)現(xiàn)象、剛度退化、滯回耗能、骨架曲線、變形性能以及典型構(gòu)件的受力行為等方面對(duì)兩個(gè)結(jié)構(gòu)進(jìn)行分析，研究結(jié)構(gòu)的抗震性能。 （3）通過(guò)引入層次分析法，基于層次分析法基本理論，將定量和定性的評(píng)價(jià)相結(jié)合，對(duì)高烈度區(qū)大容量機(jī)組分別采用鋼桁架+大尺寸鋼筋混凝土管柱結(jié)構(gòu)和鋼桁架+傘撐式鋼筋混凝土管柱結(jié)構(gòu)作出評(píng)價(jià)。 研究表明：鋼桁架+傘撐式鋼筋混凝土管柱結(jié)構(gòu)的受力和抗震性能能夠滿(mǎn)足高烈度區(qū)1000MW機(jī)組空冷支架結(jié)構(gòu)的要求。與鋼桁架+大尺寸鋼筋混凝土管柱結(jié)構(gòu)相比，鋼桁架+傘撐式鋼筋混凝土管柱結(jié)構(gòu)的豎向撓度和水平側(cè)移都明顯減小，承載能力提高。研究成果可為大容量機(jī)組空冷支架結(jié)構(gòu)的設(shè)計(jì)和應(yīng)用提供理論依據(jù)。
[Abstract]:Compared with 300MW / 600MW unit, the total height of space-time cooling support system of 1000MW unit increases, the load of equipment increases, and the seismic response and wind-induced effect increase.If the traditional steel truss reinforced concrete tubular column system is still adopted in the high intensity area, the vertical displacement of the cantilever end and the horizontal lateral displacement of the structure will be larger, which is difficult to meet the requirements of the current code and air-cooling technology.This paper is based on two kinds of air-cooled structures, such as steel truss large size reinforced concrete pipe string, steel truss umbrella braced reinforced concrete pipe string, pseudo-static test and steel truss large size reinforced concrete pipe string.Three kinds of air-cooled structural systems, such as large size reinforced concrete pipe column of fish-web steel truss and steel truss umbrella braced reinforced concrete pipe string, are subjected to vertical load.Based on the analysis of the mechanical behavior of the system under the wind load, the seismic response analysis of the system and the experimental analysis of the seismic performance of the air-cooled support structure system, a suitable type of space-time cold structure system for 1000MW units satisfying the requirements of seismic performance in the high intensity region is proposed.1) the finite element model of air cooling support structure is established by SAP2000 finite element software.For steel truss large-size reinforced concrete pipe column structure, fish-web steel truss large-size reinforced concrete pipe column structure and steel truss umbrella braced reinforced concrete pipe column structure under vertical load,The dynamic behavior of the three structures under wind load and earthquake is analyzed and the internal force and the whole displacement of the three structures are studied.(2) the pseudo-dynamic and quasi-static tests of steel truss large-sized reinforced concrete tubular column structure and steel-truss umbrella braced reinforced concrete tubular column structure are carried out, and the failure process of the structure is observed and analyzed.The mechanical characteristics of the members and the weak parts of the structure, etc.The aseismic behavior of the two structures is analyzed from the aspects of experimental phenomena, stiffness degradation, hysteretic energy dissipation, skeleton curve, deformation performance and the mechanical behavior of typical members.By introducing the Analytic hierarchy process (AHP) and based on the basic theory of AHP, the quantitative and qualitative evaluation is combined.The steel truss large-sized reinforced concrete pipe column structure and the steel truss umbrella braced reinforced concrete pipe string structure are used to evaluate the large capacity units in the high intensity region.The results show that the stress and seismic behavior of steel truss umbrella braced reinforced concrete tubular column structure can meet the requirements of air-cooled support structure of 1000MW units in high intensity region.Compared with steel truss large size reinforced concrete tubular column structure the vertical deflection and horizontal lateral displacement of steel truss umbrella braced reinforced concrete tubular column structure are obviously reduced and the bearing capacity is improved.The research results can provide theoretical basis for the design and application of air-cooling support structure for large capacity units.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：TU318;TU352.11

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