組合基礎(chǔ)隔震結(jié)構(gòu)設(shè)計(jì)及近斷層地震反應(yīng)分析*
王棟，周穎，呂西林
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（同濟(jì)大學(xué)土木工程防災(zāi)國家重點(diǎn)實(shí)驗(yàn)室， 上海 200092）
［摘要］基礎(chǔ)隔震是通過在結(jié)構(gòu)物與基礎(chǔ)間設(shè)置隔震裝置來延長(zhǎng)結(jié)構(gòu)自振周期并增大結(jié)構(gòu)阻尼，從而阻止地震能量向上部結(jié)構(gòu)傳遞以減小結(jié)構(gòu)地震響應(yīng)的一種技術(shù)手段。采用天然橡膠支座、鉛芯橡膠支座、彈性摩擦滑板支座加阻尼器的組合基礎(chǔ)隔震系統(tǒng)可以充分發(fā)揮不同減隔震器的特性并控制支座變形，從而達(dá)到良好的隔震效果。通過高烈度區(qū)乙類建筑工程實(shí)例，闡述了組合基礎(chǔ)隔震系統(tǒng)的設(shè)計(jì)方法、支座選擇與布置原則，以及設(shè)計(jì)過程中控制參數(shù)的驗(yàn)證。時(shí)程分析表明，組合基礎(chǔ)隔震系統(tǒng)可以有效減小結(jié)構(gòu)的地震響應(yīng)；罕遇地震作用下，結(jié)構(gòu)頂層X，Y向加速度響應(yīng)可分別減小66.6%和73.6%；結(jié)構(gòu)底層X，Y向?qū)娱g位移角可分別減小65.2%和64.2%，剪重比可分別減小62.2%和64.3%。［關(guān)鍵詞］橡膠隔震支座; 滑板隔震支座; 阻尼器; 地震響應(yīng)中圖分類號(hào)：TU352.1 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2016)11-0066-06
Design of structure with combined base-isolation system and response analysis of near-fault earthquakeWang Dong, Zhou Ying, Lü Xilin(State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)Abstract: The base-isolation technique, setting isolation devices between basement and superstructure, could prolong the vibration period of isolated structure and increase structural damping to prevent the quake motion transfer from ground to superstructure, thus reducing the responses of structure subjected to earthquake. A combined base-isolation system composed of natural rubber bearings, lead rubber bearings, elastic sliding bearings and viscous dampers was introduced. The combined base seismic-isolation system can take full advantage of properties of different isolation dampers to control bearing displacement to achieve good seismic isolation effect. Based on B-class practical building engineering in high seismic precautionary intensity region, the design method, selection and arrangement principles of bearings and verification of design parameters of the combined base seismic-isolation system were discussed. Time-history analysis shows that the combined base seismic-isolation system can effectively reduce seismic response of the structure; Under the rare earthquake, roof acceleration responses are reduced by 66.6% and 73.6% respectively for X and Y directions, drift ratios of bottom layers are reduced by 65.2% and 64.2% respectively for X and Y directions, and shear-to-weight ratios of bottom layers are reduced by 62.2% and 64.3% respectively for X and Y directions.Keywords: rubber isolation bearing; sliding isolation bearing; damper; seismic response
*國家自然科學(xué)基金項(xiàng)目（51261120377，51322803）。作者簡(jiǎn)介：王棟，博士研究生，Email: wdong19840426@hotmail.com。
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