發(fā)布時(shí)間：2018-01-04 02:18

  本文關(guān)鍵詞：多跨輸煤皮帶通廊橋架抗震性能分析　出處：《西安科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 輸煤皮帶通廊 鋼桁架 抗震性能 反應(yīng)譜法 時(shí)程分析法

【摘要】：輸煤皮帶通廊橋架在煤礦、選煤廠以及火電廠等工廠都有著廣泛的應(yīng)用。隨著我國(guó)煤炭行業(yè)的發(fā)展與建設(shè)標(biāo)準(zhǔn)的提高，輸煤皮帶通廊橋架結(jié)構(gòu)的建設(shè)標(biāo)準(zhǔn)越來(lái)越高�？墒禽斆浩ɡ葮蚣芙Y(jié)構(gòu)在歷次的地震中破壞較多，，給企業(yè)造成了嚴(yán)重的經(jīng)濟(jì)損失。所以，對(duì)輸煤皮帶通廊橋架結(jié)構(gòu)的抗震性能進(jìn)行深入的研究，提出抗震設(shè)計(jì)建議具有重要的理論意義和工程應(yīng)用價(jià)值。 本文利用SAP2000有限元軟件，對(duì)工程中常見的3種結(jié)構(gòu)形式的輸煤皮帶通廊橋架進(jìn)行模擬，根據(jù)模擬計(jì)算結(jié)果，對(duì)三個(gè)結(jié)構(gòu)的抗震性能進(jìn)行了系統(tǒng)分析，主要做了下列研究工作: (1)對(duì)三種不同結(jié)構(gòu)形式的橋架結(jié)構(gòu)進(jìn)行了模態(tài)分析，結(jié)果表明前三階振型對(duì)結(jié)構(gòu)的影響大，但高階振型時(shí)橋架上部錯(cuò)動(dòng)變形大，計(jì)算中高階振型不能忽略。 (2)對(duì)三個(gè)橋架結(jié)構(gòu)在縱、橫、豎向及水平雙向四個(gè)工況下的地震作用進(jìn)行反應(yīng)譜分析，分析表明橋架結(jié)構(gòu)的柱頂位移角在1/2319~1/1045之間，均滿足1/550的限值。橋架三加設(shè)下拉吊桿較三角腹桿式和下斜式無(wú)下拉吊桿的橋架剛度大，加設(shè)吊桿后，使得部分上、下弦桿的與無(wú)吊桿的橋架內(nèi)力符號(hào)相反，部分內(nèi)力被抵消，減小了橋架撓度。 (3)對(duì)三個(gè)橋架結(jié)構(gòu)做了地震作用下的彈性時(shí)程分析，并與反應(yīng)譜分析結(jié)果進(jìn)行對(duì)比。分析表明此類大跨度結(jié)構(gòu)應(yīng)當(dāng)注意端門架的剛度，以保證在橫向地震來(lái)臨時(shí)結(jié)構(gòu)的安全性。 (4)對(duì)橋架進(jìn)行了動(dòng)力彈塑性時(shí)程分析，得出結(jié)構(gòu)在八度罕遇地震作用下的變形與受力，非線性分析結(jié)果表明下部混凝土支架的框架梁和柱均不同程度的進(jìn)入塑性狀態(tài)，其中框架柱的下端為薄弱位置。 本文結(jié)合國(guó)內(nèi)外的工程實(shí)例與經(jīng)驗(yàn)，通過對(duì)實(shí)際結(jié)構(gòu)的模擬分析提了一些抗震建議，為以后設(shè)計(jì)人員對(duì)此類結(jié)構(gòu)的抗震設(shè)計(jì)與分析提供參考。
[Abstract]:Coal conveyance belt is widely used in coal mines, coal preparation plants and thermal power plants, etc. With the development of coal industry and the improvement of construction standards in China. The construction standard of coal conveyer belt through the bridge structure is higher and higher. However, the coal conveyer belt bridge bridge structure has been destroyed more in successive earthquakes, which has caused serious economic losses to enterprises. The aseismic performance of coal conveyer belt through the bridge frame structure is studied in depth. It is of great theoretical significance and engineering application value to put forward the seismic design suggestion. In this paper, SAP2000 finite element software is used to simulate the three kinds of coal conveyer belt used in the project, and the simulation results are given according to the simulation results. The aseismic performance of the three structures is systematically analyzed, and the following research work is done: The results show that the first three vibration modes have a great influence on the structure, but the upper part of the bridge frame has a large staggered deformation. High-order modes can not be ignored in calculation. (2) the seismic response spectrum of three bridge structures under longitudinal, horizontal, vertical and horizontal conditions is analyzed. The analysis shows that the displacement angle of the column top of the bridge structure is between 1 / 2319 / 1 / 1045. All meet the limit value of 1/550. The three pull-down suspenders of the bridge frame are more rigid than those of the triangulated web type and the lower inclined type without pull-down suspenders, so that part of the suspension is made up after adding the suspenders. The internal force of the lower chord is counteracted and the deflection of the bridge is reduced. 3) the elastic time history analysis of three bridge structures under seismic action is made, and the results are compared with the results of response spectrum analysis. The analysis shows that the stiffness of the end portal frame should be paid attention to in this kind of long-span structure. To ensure the safety of the structure in the event of a lateral earthquake. 4) the dynamic elastoplastic time history analysis of the bridge frame is carried out, and the deformation and force of the structure under the action of octave earthquake are obtained. The nonlinear analysis results show that the frame beams and columns of the lower concrete support are in plastic state in varying degrees, and the lower end of the frame column is in the weak position. Based on the engineering examples and experiences at home and abroad, this paper puts forward some seismic suggestions through the simulation and analysis of actual structures, which provides a reference for designers to design and analyze such structures in the future.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55;U448.18

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