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(中國建筑西北設(shè)計研究院有限公司, 西安 710018)

摘要: 西安咸陽國際機場東航站樓主體結(jié)構(gòu)為鋼筋混凝土框架結(jié)構(gòu),屋蓋及其支撐體系為鋼結(jié)構(gòu)。 中央主樓核心區(qū)長 486m,寬 252m,作為人流密集的國家級交通樞紐工程,建筑功能復(fù)雜,抗震設(shè)防標(biāo)準(zhǔn)高,設(shè)計采用了層間隔震技術(shù)。 隔震層由鉛芯橡膠隔震支座、普通橡膠隔震支座、彈性滑板支座和黏滯阻尼器組合而成。 隔震相關(guān)計算分析及驗算結(jié)果表明,設(shè)防地震作用下隔震后上部結(jié)構(gòu)樓層剪力及樓層加速度降低至非隔震時的 38% 以下,隔震層上部結(jié)構(gòu)可按降低設(shè)防烈度 1 度進行設(shè)計。 罕遇地震下隔震層下柱墩變形及承載力驗算結(jié)果表明,通過設(shè)置型鋼拉梁層能夠使其滿足罕遇地震下的變形及承載力要求。 隔震結(jié)構(gòu)的溫度效應(yīng)計算結(jié)果表明,隔震后結(jié)構(gòu)溫度應(yīng)力效應(yīng)顯著降低,通過合理設(shè)置結(jié)構(gòu)后澆帶,隔震層在施工階段及正常使用階段的溫度變形均能滿足預(yù)期的性能要求。 最后采用時程法研究了隔震層在遭遇罕遇地震后的自復(fù)位能力,結(jié)果顯示,隔震層震后殘余變形較小,自復(fù)位能力良好。

關(guān)鍵詞: 西安咸陽國際機場; 航站樓; 隔震設(shè)計; 隔震支座; 彈性滑板支座; 黏滯阻尼器; 溫度效應(yīng)

中圖分類號:TU318,TU352. 12 文獻標(biāo)志碼:A 文章編號:1002-848X(2022)11-0015-07

DOI:10. 19701 / j. jzjg. XBY2207

Seismic isolation design on east terminal building of Xi’ an Xianyang International Airport

LI Jing, CAO Li, HU Peng, XIN Li, WANG Mian, XU Liangqi, ZHU Cong, DU Wen

(China Northwest Architectural Design and Research Institute Co. , Ltd. , Xi’ an 710018, China)

Abstract: The main structure of the east terminal building of Xi’ an Xianyang International Airport is a reinforced concrete frame structure, and the roof and its supporting system are steel structures. The central core area of the main building is 486m long and 252m wide. As a national-level transportation hub project with dense crowds, the building functions are complex and the seismic fortification standard is high. Therefore, the design adopts floor-level seismic isolation technology. The vibration isolation layer is composed of lead rubber bearings, linear natural rubber bearings, elastic sliding bearings and viscous dampers. According to the relevant calculation analysis and checking calculation of seismic isolation, the floor shear force and floor acceleration of the superstructure after the seismic isolation were reduced to less than 38% of the non-isolation state, and the superstructure of the seismic isolation layer was designed according to the reduction of the fortification intensity by 1 degree. The deformation and bearing capacity of the column piers under the seismic isolation layer were checked for rare earthquakes, and the steel tie beam layers are set to make them meet the requirements of deformation and bearing capacity under rare earthquakes. The temperature effect of the isolation structure was studied, and the results show that the temperature stress effect of the structure is significantly reduced after isolation. By rationally setting the post-poured belts of the structure, the temperature deformation of the isolation layer during the construction stage and the normal use stage could meet the expected performance requirements. The time-history method was used to study the self-resetting ability of the isolation layer after encountering the rare earthquake. The results show that the residual deformation of the seismic isolation layer after the earthquake is small, and the self-resetting ability of the isolation layer is good.

Keywords:Xi’ an Xianyang International Airport; terminal building; seismic isolation design; seismic isolator; elastic sliding bearing; viscous damper; temperature effect

∗中國建筑西北設(shè)計研究院有限公司科技研發(fā)課題(201817) 。

第一作者:李靖,碩士,高級工程師,一級注冊結(jié)構(gòu)工程師,主要從事工程抗震研究,Email:497825805@ qq.com。