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（中國(guó)建筑設(shè)計(jì)研究院， 北京 100044）

［摘要］為了考察位于斜坡地面上框架結(jié)構(gòu)的受力特點(diǎn)，分別建立了短向坡地、長(zhǎng)向坡地和雙向坡地三類計(jì)算模型，并分別考慮地面高差為1層與2層時(shí)的情況。詳細(xì)分析了坡地建筑與平地建筑在結(jié)構(gòu)動(dòng)力特性、水平地震作用下的側(cè)向位移與層間位移角、考慮偶然偏心作用時(shí)的扭轉(zhuǎn)位移比、樓層側(cè)向剛度比以及結(jié)構(gòu)內(nèi)力等方面的差異。分析結(jié)果表明，坡地建筑地下室側(cè)向剛度較小，結(jié)構(gòu)自振周期較長(zhǎng)，平動(dòng)振型與扭轉(zhuǎn)振型相互耦聯(lián)。隨著地面坡度增大，結(jié)構(gòu)自振周期增幅以及平動(dòng)、扭轉(zhuǎn)耦聯(lián)程度隨之加大。在水平地震作用下，坡地建筑地下室墻體頂點(diǎn)樓層的側(cè)向位移與層間位移角均明顯大于平地建筑。短向坡地建筑地下室對(duì)上部結(jié)構(gòu)嵌固效果較好，長(zhǎng)向坡地建筑次之，雙向坡地建筑最差。在水平地震作用下，坡地建筑地下室頂板及其下部相鄰層樓板應(yīng)力與樓面梁軸力顯著增大。隨著地面坡度增大，樓板應(yīng)力與樓面梁軸力增幅加大，而且影響范圍向下延伸。針對(duì)坡地建筑受力的特點(diǎn)，提出相關(guān)的設(shè)計(jì)建議。

［關(guān)鍵詞］坡地建筑； 動(dòng)力特性； 扭轉(zhuǎn)位移比； 側(cè)向剛度比； 嵌固效果

中圖分類號(hào)：TU375，TU973+.2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2016)23-0001-09

Analysis on performances of frame structures on sloping ground

Fan Zhong, Liu Tao, Yang Su, Gao Song

(China Architectural Design  & Research Institute, Beijing 100044, China)

Abstract:In order to study the performance of frame structures on sloping ground, three analytical models were established, in which the ground surface inclines in short side direction, long side direction and two directions respectively, and the effect of ground with one or two storey  height differential was considered. The difference between buildings at inclined and horizontal field in dynamic characteristics, lateral displacement and inter story drift ratio under horizontal earthquake, torsional displacement ratio resulted from accidental eccentricity, lateral stiffness ratio and internal force were analyzed in detail. Analyzed results show that the lateral stiffness of the buildings at sloping field is relatively small, the vibration periods are lengthened, and the translational vibration modes are coupled with the torsional modes. According to the increase of ground surface inclined angle, the natural vibration period and translation-torsion coupling degree are enlarged. The lateral displacement as well as inter-story drift ratio at the basement top of buildings at sloping field under earthquake are significantly larger than that of horizontal field. The slope of ground surface along the short side direction has the best embedded effect for structures, followed by the slope of ground surface along the long side direction, and the slope of ground surface along both directions. For the buildings at sloping field, the stresses of slabs and axial forces of beams on the ground floor and adjacent lower floor increase significantly under earthquake. With the increase of ground surface slope, the stresses of slabs and axial forces of beams greatly increase, and the influence scope of which extends downward. According to the features of buildings at sloping field, the structural design suggestions were presented.

Keywords: building at sloping field; dynamic characteristic; torsion-translation ratio; lateral stiffness ratio; embedded effect

作者簡(jiǎn)介：范重，博士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：fanz@cadg.cn。