- 摘 要
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(北京市建筑設(shè)計(jì)研究院有限公司， 北京 100045)
摘要: 特殊延性桁架式框架(STMF)是美國規(guī)范采納的一種高延性鋼結(jié)構(gòu)體系。 首先分析其在國內(nèi)鮮有應(yīng)用的限制因素，推導(dǎo)出考慮軸力及次彎矩影響的消能段極限抗剪承載力，然后根據(jù)預(yù)設(shè)性能目標(biāo)、極限狀態(tài)下非消能段滿足彈性驗(yàn)算的要求推導(dǎo)消能段長度 LS 選取的有效范圍，最后根據(jù)我國抗震設(shè)計(jì)準(zhǔn)則，對大跨度 STMF 案例進(jìn)行彈性設(shè)計(jì)及靜力推覆分析，探討 STMF 體系應(yīng)用于國內(nèi)工程的設(shè)計(jì)方法，論證現(xiàn)有研究成果在超大跨度( L >20m)工程中的適用性。 研究結(jié)果表明:根據(jù)推導(dǎo)結(jié)果可以快速確定合理的消能段長度，實(shí)現(xiàn)極限狀態(tài)下塑性變形集中在消能段，而非消能段桁架和框架柱仍處于彈性狀態(tài)的設(shè)計(jì)理念；美國規(guī)范規(guī)定消能段范圍不得有顯著豎向荷載布置、跨度 L≤ 20m、上下弦應(yīng)取相同截面，充分考慮消能段弦桿承受的軸力及次彎矩影響時(shí)，STMF 結(jié)構(gòu)可以適當(dāng)突破上述限制，且其抗震性能依舊良好。
關(guān)鍵詞: 特殊延性桁架式框架； 空腹式消能段； 抗震性能； 極限抗剪承載力
中圖分類號:TU318 文獻(xiàn)標(biāo)志碼:A 文章編號:1002￣848X(2022)02￣0092￣06
DOI:10. 19701 / j.jzjg.20211359
Analysis on seismic performance of large￣span special truss moment frame
MA Jingyou， ZHOU Bing， ZHANG Hao， ZHANG Jianliang
(Beijing Institute of Architectural Design， Beijing 100045， China)
Abstract: Special truss moment frame (STMF) is a high ductility steel structural system adopted by norms of the UnitedStates. Firstly， by analyzing the factors limiting the use of STMF in China， the ultimate shear capacity of energy dissipationsection was deduced considering the influence of axial force and secondary bending moment. Then， the effective range ofselected length of energy dissipation section LS was deduced based on the preset performance targets and the elasticchecking calculation requirement of non￣energy dissipation section under limit state. Finally， according to the seismic designcriteria of China， the elastic design and static push￣over analysis of large￣span STMF cases were carried out. The designmethods of STMF system for domestic projects were discussed. The applicability of existing research results in large￣longspan (L > 20m) projects was demonstrated. Research results show that the reasonable length of energy dissipation sectioncan be determined quickly according to deduced the results to realize the design concept that plastic deformation isconcentrated in the energy dissipating section in the limit state while the non￣energy dissipating section truss and framecolumns are still in an elastic state； norms of the United States stipulate that the range of energy dissipation section shouldnot have the arrangement of obvious vertical load， the span L ≤ 20 m， and the upper and lower chords should have thesame cross section. When the axial force and secondary bending moment of the chord in the energy dissipation section arefully considered， the STMF structure can appropriately break through the above limitations， and its seismic performance isstill good.
Keywords: special truss moment frame； vierendeel￣truss energy dissipation section； seismic performance； ultimateshear capacity
第一作者:馬敬友，碩士，教授級高級工程師，主要從事結(jié)構(gòu)設(shè)計(jì)工作，Email:majingyou@ biad.com.cn。
[引用本文] 馬敬友， 周冰， 張晧， 等. 大跨度特殊延性桁架式框架抗震性能分析[ J]. 建筑結(jié)構(gòu)，2022，52(2):92￣97，70. MA Jingyou， ZHOU Bing， ZHANG Hao， et al. Analysis on seismic performance of large￣span special trussmoment frame[J]. Building Structure， 2022， 52(2):92￣97，70.
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