本文選題：空冷平臺結(jié)構(gòu) + 彈塑性動力分析　； 參考：《哈爾濱工業(yè)大學(xué)》2013年碩士論文

【摘要】：空冷平臺是直接空冷火力發(fā)電廠的重要結(jié)構(gòu)，其結(jié)構(gòu)形式較為單一，鋼梁-斜撐-支柱型空冷平臺結(jié)構(gòu)是一種新的結(jié)構(gòu)形式。該體系主要由鋼筋混凝土管柱、平臺梁系、人字形支撐以及A形架組成，，剛度、質(zhì)量分布嚴重不均勻，因此，應(yīng)對其抗震性能加以足夠的重視。而且目前國內(nèi)外的相關(guān)研究很少，深入研究該結(jié)構(gòu)在罕遇地震作用下的損傷特性、變形特性以及受力特性具有重要的工程意義。 本文采用有限元數(shù)值模擬方法，通過彈塑性時程分析研究鋼梁-斜撐-支柱型空冷平臺結(jié)構(gòu)在罕遇地震作用下的損傷特性、變形特性以及受力特性，主要完成了以下工作： （1）按照抗震設(shè)防烈度和連接假定的組合，分別按7度設(shè)防剛接和鉸接兩個方案來建立空冷平臺結(jié)構(gòu)三維有限元數(shù)值模型； （2）采用有限元數(shù)值模擬方法，對兩個方案模型進行模態(tài)分析，獲得結(jié)構(gòu)的自振特性； （3）進行彈塑性時程分析，研究結(jié)構(gòu)在罕遇地震作用下的損傷特性、變形特性以及受力特性； （4）通過增量時程分析，研究空冷平臺結(jié)構(gòu)在罕遇地震作用下的延性。 研究表明：結(jié)構(gòu)自由振動以兩個正交方向的平動為主且?guī)в幸欢ǖ呐まD(zhuǎn)效應(yīng)，需要考慮扭轉(zhuǎn)耦聯(lián)影響；在對空冷平臺支架結(jié)構(gòu)體系進行整體分析時可以不考慮A形架與立柱、鋼架的相互作用；鋼梁-斜撐-支柱型空冷平臺結(jié)構(gòu)的塑性鉸主要出現(xiàn)在立柱根部及上部與斜撐連接處上下一定范圍內(nèi)，應(yīng)有針對性地對容易發(fā)生屈服的薄弱部位的變形能力進行加強，使其具有較好的抗震性能；在A形架頂點位移方面，鉸接結(jié)構(gòu)方案比剛接結(jié)構(gòu)方案有一定的優(yōu)勢；支撐體系對于空冷平臺剛架的加強效果顯著，人字形支撐的應(yīng)用是可行的。 最后根據(jù)理論分析及數(shù)值計算結(jié)果提出相關(guān)建議：加強立柱與支撐連接部位的構(gòu)造要求，并且取消斜撐的錯位連接或?qū)υ撨B接部位的構(gòu)造進行特別加強以使節(jié)點具有較好的承載能力和變形能力。
[Abstract]:The air cooling platform is an important structure of direct air-cooled power plant, its structure is simple, the steel bracing - pillar type air cooling platform structure is a new structure. This system is mainly composed of reinforced concrete pipe column, beam system, herringbone braced and A shaped frame, stiffness. The mass distribution is seriously uneven, therefore, should be paid enough attention to the seismic performance. But there is little relevant research at home and abroad, further study of the structure with damage characteristics under rare earthquake, the deformation characteristics and stress characteristics has important engineering significance.
In this paper, the finite element numerical simulation is used to study the damage characteristics, deformation characteristics and stress characteristics of the steel beam braced braced air-cooled platform under rare earthquake.
(1) according to the combination of aseismic fortification intensity and connection assumption, three dimensional finite element numerical models of air cooling platform structure are established by two schemes of 7 degrees fortification and rigid connection respectively.
(2) using the finite element numerical simulation method, the modal analysis of the two scheme models is carried out to obtain the self vibration characteristics of the structure.
(3) the elastoplastic time history analysis is carried out to study the damage characteristics, deformation characteristics and stress characteristics of the structure under the action of rare earthquake.
(4) through the incremental time history analysis, the ductility of the air cooled platform structure under the action of rare earthquake is studied.
The research shows that the structural free vibration in two orthogonal directions of the translational and torsional effect with the need to reverse the coupling effect; in the overall analysis of the air cooling platform supporting structure system can be neglected when the A frame and the column, the interaction of steel frame; steel bracing beam plastic hinge pillar type of air cooling platform structure mainly occurred in the upper part and the column root and diagonal joints under a certain range, due to deformation to weak parts prone to yield were strengthened, which has better seismic performance; frame displacement in A, articulated structure scheme has certain advantages than the rigid structure of the program; support system to strengthen the effect of the air cooling platform frame significantly, application of herringbone bracing is feasible.
Finally, according to the results of theoretical analysis and numerical calculation, puts forward relevant suggestions: strengthen the construction of supporting columns and connecting parts of the requirements, and the abolition of the bracing structure of dislocation connection or the connection part of special strengthening so that the node has better bearing capacity and deformation capacity.

【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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