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（西安建筑科技大學(xué) 710055）
【提要】將鋼筋混凝土高層建筑結(jié)構(gòu)的性能劃分為三個(gè)水平，即使用良好、人身安全和防止倒塌，并用層間側(cè)移角限值予以量化。選作用倒三角形分布荷載的等截面懸臂桿的側(cè)移曲線，作為框架結(jié)構(gòu)、剪力墻結(jié)構(gòu)和框架剪力墻結(jié)構(gòu)的初始側(cè)移模式，對于使用良好性能水平，由性能水平和初始側(cè)移模式確定其目標(biāo)側(cè)移曲線，然后確定等效單自由度體系的等效參數(shù)以及原多自由度體系的基底剪力和各質(zhì)點(diǎn)的水平地震作用，進(jìn)而進(jìn)行構(gòu)件截面承載力設(shè)計(jì)。對按此設(shè)計(jì)的結(jié)構(gòu)進(jìn)行推覆分析，校核結(jié)構(gòu)的側(cè)移形式與所采用的初始側(cè)移曲線是否一致并用相應(yīng)的推覆曲線作為修正后的目標(biāo)側(cè)移曲線重新計(jì)算，直至滿足為止。對于人身安全和防止倒塌性能水平，直接用達(dá)到其相應(yīng)性能水平的推覆曲線作為目標(biāo)側(cè)移曲線，計(jì)算相應(yīng)的等效位移和基底剪力，并繪出需求曲線，根據(jù)需求曲線與推覆曲線的關(guān)系調(diào)整設(shè)計(jì)結(jié)果。算例表明方法簡單實(shí)用。
【關(guān)鍵詞】 鋼筋混凝土結(jié)構(gòu) 基于位移的抗震設(shè)計(jì) 性能水平 側(cè)移模式
Research on Displacementbased Seismic Design Method  of RC Highrise Structure/
Liang Xingwen，Deng Mingke，Li Xiaowen，Li Fangyuan(Civil Engineering Institute, Xi'an University of Architecture and Technology, Xi'an 710055,China)
Abstract:According to the characteristic of highrise structure，its seismic performance level is divided into three levels: serviceability, lifesafety, and collapse protection. The three levels are qualified with story drift angles. Applying the inverted triangular distribution of lateral force to the cantilever member with identical section, the displaced shape of it is regarded as the initial lateral displacement mode of the frame structure, shear wall structure and frameshear wall structure. In the serviceability performance level, the target lateral displacement is determined by the performance level and initial lateral displacement mode of the structure. Afterward, the equivalent parameters of singledegreeoffreedom system and the base shear and horizontal earthquake action of every mass of multidegreeoffreedom system can be determined, and then the structural members can be designed. Finally, the designed structure is analyzed with pushover method. If the drift curve is not identical with the initial assumed shape, then the pushover drift curve is regarded as the modified drift shape to recalculate till it is required. In the lifesafety and collapse protection performance level, the pushover drift curve reached the corresponding performance level is r
egarded as the target lateral displacement curve. Then the equivalent displacement and the base shear can be calculated, and the required curve can be drawn.The result of calculation is adjusted according to the relationship of the required curve and pushover curve.
Keywords:reinforced concrete structure; displacementbased seismic design; performance l
evel; lateral displacement mode