本文選題：延性節(jié)點 + 空間鋼框架　； 參考：《青島理工大學(xué)》2013年碩士論文

【摘要】：目前，國內(nèi)外對塑性鉸外移的新型梁柱節(jié)點及平面鋼框架的研究已經(jīng)取得了一定的成果，，但新型延性節(jié)點的性能并不能完全反映出空間鋼框架的整體性能。所以本文從空間鋼框架結(jié)構(gòu)整體受力情況出發(fā)，結(jié)合新型延性節(jié)點的研究成果，建立新型延性節(jié)點空間鋼框架模型并模擬在低周反復(fù)荷載作用下的破壞機理、滯回性能、退化性能等抗震性能以及關(guān)鍵部位處的損傷性能，這對新型延性節(jié)點鋼框架的設(shè)計及工程應(yīng)用具有指導(dǎo)意義。 按照國內(nèi)現(xiàn)行規(guī)范及美國相關(guān)規(guī)范設(shè)計普通節(jié)點空間鋼框架（OSF）、對稱加腋節(jié)點空間鋼框架（SHF）、翼緣過渡板加強型節(jié)點空間鋼框架（FPF）、圓弧擴翼式節(jié)點空間鋼框架（WFF）、圓弧削弱式節(jié)點空間鋼框架（RBF），利用ANSYS有限元分析軟件，對鋼框架模型進行低周反復(fù)的位移加載，得到五種節(jié)點形式空間鋼框架的應(yīng)力及應(yīng)變的發(fā)展情況，破壞發(fā)展過程，滯回性能，對比分析抗震指標(biāo)和損傷退化指標(biāo)，評價出各個空間鋼框架的抗震性能優(yōu)劣。 研究結(jié)果表明：各延性節(jié)點空間鋼框架均能實現(xiàn)梁端塑性鉸外移的目的，破壞發(fā)展情況相近，普通節(jié)點鋼框架（OSF）、對稱加腋節(jié)點鋼框架（SHF）及翼緣過渡板節(jié)點鋼框架（FPF）柱腳由于受力最大而最先出現(xiàn)大塑性變形，梁端下翼緣均發(fā)生平面外屈曲變形，最終因為柱腳及梁端部塑性變形過大，導(dǎo)致框架的整體內(nèi)力重分布不適于繼續(xù)變形發(fā)展而破壞。圓弧擴翼式節(jié)點鋼框架（WFF）和圓弧削弱式節(jié)點鋼框架（RBF）最先在梁上擴翼板末端和削弱最深處出現(xiàn)大塑性變形，其次在柱翼緣出現(xiàn)塑性變形，可以延遲柱腳處塑性發(fā)展，最終因柱腳塑性變形大而引起整體空間鋼框架的扭轉(zhuǎn)和承載力的降低并導(dǎo)致結(jié)構(gòu)破壞。所有的空間鋼框架模型均會發(fā)生柱腳處塑性破壞，必須通過構(gòu)造措施設(shè)置加勁肋或用混凝土包裹柱腳以提高柱腳的抗彎能力。相比于普通節(jié)點鋼框架，延性節(jié)點鋼框架的滯回性能，延性性能及耗能能力均有不同程度的提高，梁柱翼緣焊縫連接處應(yīng)力及開裂指數(shù)都降低，各鋼框架模型在加載后期承載力退化不一，而剛度退化比較一致。 本文研究成果對工程設(shè)計有一定的指導(dǎo)價值，并為進一步研究新型延性節(jié)點空間鋼框架的整體抗震性能打下基礎(chǔ)。
[Abstract]:At present, some achievements have been made in the research of the new Liang Zhu joints and plane steel frames with plastic hinges, but the performance of the new ductile joints can not completely reflect the overall performance of the spatial steel frames. In this paper, based on the whole stress situation of spatial steel frame structure and combined with the research results of new ductile joints, a new model of spatial steel frame with ductile joints is established and the failure mechanism and hysteretic behavior of the new ductile joints are simulated under low cyclic loading. The seismic performance such as degenerative performance and damage performance at key locations are of guiding significance for the design and engineering application of a new ductile joint steel frame. Design of Common Node Space Steel frame (OSF), Symmetry and axillary Node Space Steel frame (SHF), Flange transition Plate reinforced Joint Steel frame (FPF), Circular Arc expansion Joint Space Steel frame (WFF) according to current domestic Code and relevant US Code The weakened joint spatial steel frame (RBF) is analyzed by ANSYS finite element analysis software. The low cycle displacement loading of steel frame model is carried out, and the development of stress and strain, damage development process, hysteretic performance, seismic index and damage degradation index of steel frame with five joint forms are obtained. The seismic performance of each space steel frame is evaluated. The results show that the steel frames with ductile joints can achieve the external displacement of plastic hinge at the end of the beam, and the damage development is similar. The large plastic deformation of column foot of common joint steel frame (OSF), symmetrical steel frame with axillary joint (SHF) and flange transition plate joint steel frame (FPF) occurs first due to the maximum force, and the lower flange of beam is subjected to out-of-plane buckling deformation. Finally, because the plastic deformation of the column foot and the end of the beam is too large, the internal force redistribution of the frame is not suitable for further deformation and development. WFF and RBF are the first large plastic deformation at the end of the expanded flange on the beam, and then plastic deformation at the flange of the column, which can delay the plastic development at the base of the column. Finally, the torsion and bearing capacity of the whole spatial steel frame are reduced due to the large plastic deformation of the column foot, which leads to the failure of the structure. All spatial steel frame models will have plastic failure at the column foot. Stiffening ribs or enclosing the column foot with concrete must be set through construction measures to improve the flexural capacity of column foot. Compared with the ordinary joint steel frame, the hysteretic performance, ductility and energy dissipation capacity of the ductile joint steel frame are improved to some extent, and the stress and cracking index at the weld joint of Liang Zhu flange are decreased. The load-carrying capacity of each steel frame model is different at the later loading stage, but the stiffness degradation is consistent. The research results in this paper have some guiding value for engineering design and lay a foundation for further study on the overall seismic behavior of a new type of ductile joint spatial steel frame.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU391

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