- 摘 要
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(同濟大學土木工程防災(zāi)國家重點實驗室，上海 200092)
［摘要］比較了中國、美國、日本、歐洲抗震設(shè)計規(guī)范概率基礎(chǔ)、設(shè)防水準、設(shè)計準則、設(shè)防目標和阻尼比，針對鋼框架結(jié)構(gòu)比較了中美日歐地震作用的折減、截面寬厚比限值、梁柱剛接節(jié)點的塑性轉(zhuǎn)動能力要求和層間位移角限值，然后提出了鋼結(jié)構(gòu)抗震設(shè)計方法建議：將低延性結(jié)構(gòu)以外的結(jié)構(gòu)體系劃分為四個延性類別，針對各延性類別的結(jié)構(gòu)提出塑性構(gòu)件板件寬厚比限值和構(gòu)件長細比限值以及梁柱節(jié)點形式及其塑性轉(zhuǎn)動能力的要求；以50年超越概率10%的設(shè)防地震為抗震設(shè)計驗算的基準，根據(jù)結(jié)構(gòu)延性類別將設(shè)防地震的彈性地震作用折減為設(shè)計地震作用，用于構(gòu)件內(nèi)力驗算；針對“小震不壞、中震可修、大震不倒”的設(shè)防目標提出了小震彈性層間位移和中震、大震彈塑性層間位移的三階段驗算要求。該建議可以解決我國現(xiàn)行抗震規(guī)范GB50011—2001中存在的問題，提高我國抗震鋼結(jié)構(gòu)的合理性和經(jīng)濟性。
［關(guān)鍵詞］抗震延性設(shè)計方法；設(shè)計規(guī)范比較；概率基礎(chǔ)；抗震設(shè)防目標；地震作用
Discussion and recommendation on seismic design for steel structures
Shen Zuyan, Sun Feifei(State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)
Abstract:Seismic design codes of China, the United States, Japan and European Union were firstly compared in terms of probability basis, seismic fortification level, design criteria, design target and damping ratio. Seismic design requirements for steel moment frames according to the above codes were then compared regarding seismic response reduction, width-to-thickness ratio limit for beam/column cross sections, plastic rotation capacity of beam-to-column moment connections and inter-story drift limit. A proposal of seismic design method for steel structures in China was hence put forward as follows: all the structural systems other than low ductile structures were classified as 4 ductility categories; width-to-thickness ratio limits for plastic members, slenderness ratio limits for plastic members, requirements for beam-to-column moment connection types and their plastic rotation capacities were set forth with respect to each structural ductility category; earthquakes fortified with an exceedence probability of 10% in 50 years were chosen as design earthquakes, elastic effect of which was reduced as design earthquake effect according to the ductility category of a target structure and then applied for the design check of structural members; three-staged design check requirements were given as elastic inter-story drift limits under frequent earthquakes, elasto-plastic inter-story drift limits under design and rare earthquakes, corresponding to the seismic fortification objectives of keeping the structures “no damage under frequent earthquakes, repairable under design earthquakes and no collapse under rare earthquakes”. The proposal was applicable to solve inherent deficiencies in Chinese present seismic design code GB50011—2001 and to highly improve the rationality and economic efficiency of earthquake-resistant steel structures in China.
Keywords:seismic ductility design method； design code； probability basis； seismic fortification objective； seismic action
作者簡介：沈祖炎，中國工程院院士，教授，Email:zyshen@#edu.cn。
參考文獻
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