- 摘 要
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［摘要］國家博物館老館是由原中國革命博物館（甲區(qū)）和中國歷史博物館（乙區(qū)）合并而成，共分23個區(qū)段，即共由23個單體建筑組成。此次改擴建結合建筑總體功能布局要求，拆除Ⅰ～Ⅵ區(qū)，保留Ⅶ~Ⅺ區(qū)及Ⅻ，ⅩⅢ廊區(qū)。原結構均為鋼筋混凝土柔性框架結構，各區(qū)段間從基礎到屋頂層均設置了100mm的變形縫，基礎則根據(jù)結構（橫向兩邊跨小、中間跨大）特點，采用的是沿縱向兩邊跨條形聯(lián)合基礎。由《中國國家博物館檢驗報告》可知：梁、板開裂較多，裂縫最大寬度梁為1.5mm、板為2.3mm，并有少數(shù)地方出現(xiàn)露筋現(xiàn)象；抗震驗算表明：原結構在8度多遇地震作用下遠不能滿足國家有關規(guī)范要求，必須進行加固。結構加固設計，針對各區(qū)段不同情況，運用結構綜合抗震能力分析方法和多種最新加固手段，在保持原有建筑風貌的前提下，實現(xiàn)了提高結構抗震能力和改善使用功能的協(xié)調。采用非線性動力時程分析方法，分析了其中一個區(qū)段（Ⅶ甲區(qū)）在罕遇地震輸入下結構的彈塑性響應，對比研究了結構在加固前后的彈塑性抗震性能，為工程設計提供了參考。
［關鍵詞］中國國家博物館； 抗震加固； 非線性動力時程分析； 抗震性能
中圖分類號： TU312.1 文獻標識碼： A文章編號：1002-848X(2011)11-0103-04
Comparative of seismic performance for the unstrengthened/strengthened block Ⅶa in the old National Museum
Yang Tao，Guo Hao，Huang Ruhui，Zhang Jun，Xiao Qing，Nie Qi，Tang Caoming (CABR Technology Co., Ltd., China Academy of Building Research, Beijing 100013, China)
Abstract：The old National Museum of China was composed of the Museum of Chinese Revolution and the Museum of Chinese History, which altogether composed by 23 blocks. Consulting the requirement of the architectural layout, this rebuild and extend project dismantled block Ⅰ~Ⅳ, and retains block Ⅵ~Ⅺ, Ⅻ, ⅩⅢ. All blocks of the old museum are reinforced concrete frame structure, which deformation joints set in each block from strip foundation to roof are width of 100mm. The inspection report of the National Museum of China indicated that there were many cracks in beams and boards of the building. The biggest crack is 1.5mm in the beam and 2.3mm in the floor, even rebars can be seen in several places. The seismic calculation indicated that under 8 degree frequent earthquake, the safety reliability of several parts are very low and canot satisfy the requirements of national currently code. In the structural strengthening design, the ways of analyzing synthetical anti-seismic capability and several new strengthened methods are used successfully. In that way, the original construction styles are contained, the anti-seismic capability is enhanced and the use function is improved simultaneously. The elasto-plastic response under rarely earthquake in the block Ⅶa is studied with the method of nonlinear dynamic history analysis. The analysis results have been used in the structure design.
Keywords: National Museum; seismic strengthening; nonlinear dynamic history analysis; seismic performance
作者簡介：楊韜（1980-），男，碩士，工程師，研究方向：工程抗震與設計，Email：jdudu@sina.com。
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