本文關(guān)鍵詞： 基于性能的塑性設(shè)計(jì) 偏心支撐框架 目標(biāo)位移 整體破壞模式 彈塑性變形　出處：《工程力學(xué)》2017年05期 　論文類型：期刊論文

【摘要】：Y形高強(qiáng)鋼組合偏心支撐框架結(jié)構(gòu)(YEBF)的耗能梁段采用屈服點(diǎn)較低的鋼材,框架梁、柱采用高強(qiáng)度鋼材,采用高強(qiáng)鋼可有效減小構(gòu)件截面,節(jié)約鋼材,降低造價(jià)。現(xiàn)行設(shè)計(jì)規(guī)范中偏心支撐結(jié)構(gòu)基于彈性理論進(jìn)行設(shè)計(jì),采用內(nèi)力放大系數(shù)的方法保證結(jié)構(gòu)在罕遇地震下耗能梁段進(jìn)入塑性,其他構(gòu)件保持彈性,結(jié)構(gòu)的彈塑性變形可能過于集中而出現(xiàn)薄弱層。該文提出了采用基于性能設(shè)計(jì)方法(PBPD)設(shè)計(jì)剪切屈服型耗能梁段YEBF結(jié)構(gòu)(S-YEBF),以目標(biāo)位移和理想的整體破壞模式為作為預(yù)測和控制結(jié)構(gòu)彈塑性受力狀態(tài)的性能目標(biāo),保證結(jié)構(gòu)在罕遇地震作用下各層耗能梁段均能參與耗能,使結(jié)構(gòu)層間側(cè)移角分布趨于均勻,避免出現(xiàn)薄弱層。根據(jù)PBPD方法設(shè)計(jì)了多層S-YEBF結(jié)構(gòu),對其1/2縮尺模型進(jìn)行了振動臺試驗(yàn)以評估其抗震性能。通過非線性靜力推覆分析和動力時程分析對比了分別采用PBPD方法和傳統(tǒng)設(shè)計(jì)方法設(shè)計(jì)的10層S-YEBF結(jié)構(gòu)算例的抗震性能。結(jié)果表明:采用PBPD方法設(shè)計(jì)的S-YEBF結(jié)構(gòu)具有良好的抗震性能,結(jié)構(gòu)呈較為理想的整體破壞模式,在罕遇地震作用下,各層耗能梁段均參與耗能,層間側(cè)移角沿結(jié)構(gòu)高度方向分布較均勻;與傳統(tǒng)設(shè)計(jì)相比,PBPD方法設(shè)計(jì)的S-YEBF結(jié)構(gòu)層間側(cè)移角分布更均勻,并且可節(jié)省一定的鋼材;PBPD設(shè)計(jì)方法可以為S-YEBF結(jié)構(gòu)的工程設(shè)計(jì)提供參考。
[Abstract]:The energy dissipation beam section of YEBF frame structure with Y-shape high strength steel composite eccentrically braced frame structure adopts steel with lower yield point, high strength steel with frame beam and column, and high strength steel can effectively reduce the section of the member and save steel. In the current design code, eccentrically braced structures are designed on the basis of elastic theory. The method of internal force magnification factor is adopted to ensure that the energy dissipation beam section of the structure enters plasticity under rare earthquake, while other members remain elastic. The elastic-plastic deformation of the structure may be too concentrated and the weak layer may appear. In this paper, a performance-based design method is proposed to design the shear yield energy dissipation beam segment YEBF structure (S-YEBF). Taking the target displacement and the ideal overall failure mode as the performance targets to predict and control the elastic-plastic stress state of the structure, the energy dissipation beam section of each layer can participate in the energy dissipation under the rare earthquake. The lateral angle distribution of the structure layer tends to be uniform, and the weak layer is avoided. According to the PBPD method, the multi-layer S-YEBF structure is designed. The shaking table test of its 1/2 scale model was carried out to evaluate its seismic performance. Through nonlinear static push-over analysis and dynamic time-history analysis, 10 stories designed by PBPD method and traditional design method were compared respectively. Seismic behavior of S-YEBF structure example. The results show that:. The S-YEBF structure designed by PBPD method has good seismic performance. Under the action of rare earthquake, the energy dissipation beam section of each layer takes part in energy dissipation, and the lateral angle between layers distributes evenly along the height direction of the structure. Compared with the traditional design, the S-YEBF structure designed by PBPD has more uniform lateral angle distribution, and can save a certain amount of steel. PBPD design method can provide reference for the engineering design of S-YEBF structure.
【作者單位】： 西安建筑科技大學(xué)土木工程學(xué)院;西安建筑科技大學(xué)材料科學(xué)與工程博士后流動站;西安理工大學(xué)土木建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51178382)
【分類號】：TU391
【正文快照】： 偏心支撐框架結(jié)構(gòu)兼有中心支撐結(jié)構(gòu)的剛度及框架結(jié)構(gòu)的延性,利用耗能梁段的塑性變形耗散地震能量,是一種優(yōu)良的抗震結(jié)構(gòu)體系[1 4]。高強(qiáng)鋼組合偏心支撐框架結(jié)構(gòu)的耗能梁段采用屈服點(diǎn)低且延性較好的鋼材(如Q235鋼、Q345鋼),框架梁、柱采用高強(qiáng)鋼(如Q460鋼)。在大震作用下,耗能

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