- 摘 要
-
焦 柯，陳潤輝
(廣東省建筑設(shè)計研究院，廣州510010)[摘要] 基于彈塑性分析軟件，分析了罕遇地震作用下樓梯參與整體工作對框架結(jié)構(gòu)和框剪結(jié)構(gòu)不同的影響，包括塑性鉸出現(xiàn)的位置、各構(gòu)件進入塑性的順序、樓梯間角柱的剛度退化、樓梯偏置對框架結(jié)構(gòu)的扭轉(zhuǎn)影響、樓梯剛度貢獻與墻肢長度關(guān)系等。計算結(jié)果表明，樓梯應(yīng)參與結(jié)構(gòu)整體計算才能準(zhǔn)確反映結(jié)構(gòu)在大震下的變形、內(nèi)力和損傷。對于框架結(jié)構(gòu)，梯間角柱、梯梁、梯柱和梯板在地震中首先屈服并破壞，是結(jié)構(gòu)的薄弱部位，應(yīng)在設(shè)計中加強。對于框架剪力墻結(jié)構(gòu)，樓梯的影響隨著剪力墻側(cè)向剛度的增大而減小。
[關(guān)鍵詞] 樓梯；建筑結(jié)構(gòu)；靜力彈塑性分析；動力彈塑性分析；剛度退化Elastic-plastic analysis on staircase participated in the working of building structure
Jiao Ke, Chen Runhui
(The Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, China)Abstract: Based on the elastic-plastic analysis software, the effect of staircase participated in the working of frame structure and frame-shear wall structure under strong earthquake are estimated. The location of plastic hinge, the order of the components damage, the stiffness degradation of the comer column, the effect of torsion of the staircase eccentrically placed in frame structure and the relationship between the stiffness contribution of the stairs and the length of the branches of shear wall are analyzed. The results show that, in order to accurately reflect the deformation, internal force and damage of the structure under strong earthquake, the stairs should be involved in the overall analysis of building structure. For frame structure, corner column in staircase, staircase beam, staircase column and the slab of staircase are firstly yielded and damaged. They are the weak ptuls of the structure and should be strengthened in design. For frame-shear wall structure, the effect of the stairs will reduce with the increasing of lateral stiffness of the shear wall.
Keywords: staircase; building structure; Pushover analysis; dynamic elastic- plastic analysis; stiffness degradation
