西昌市某高层剪力墙结构隔震设计与分析
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摘要
针对西昌市某高层钢筋混凝土剪力墙结构进行了橡胶支座隔震设计和抗震性能分析。西昌市抗震设防烈度为9度,历史上曾发生过7.5级地震。该工程场址地质构造较复杂,东侧区域有一条隐伏断层,属则木河断裂带次生断层。则木河断裂带是川西主要发震断裂带之一,至今仍是一条活动较强烈的大断裂。按照《建筑抗震设计规范》(2016版)要求,取近场影响系数1.5,以提高结构的安全度;选取Ⅱ类场地5条天然地震波和2条人工模拟地震波,共计七条符合规范要求的地震波;基于SAP2000软件对结构进行了隔震设计,中震作用下结构层间剪力和倾覆弯矩减震系数最大值为0.24,比非隔震结构地震响应减小显著,罕遇地震下隔震支座的面压、水平位移能够满足规范要求。采用ABAQUS对结构进行了罕遇地震动力弹塑性时程分析,结果表明结构能够满足"大震不倒"的抗震设防目标。
An isolation design and seismic performance analysis of the rubber bearing for a reinforced concrete high-rise shear wall structure in Xichang City were performed in the study. A buried fracture zone, the secondary fault of the Zemuhe fault is in the east of the engineering site, and the seismic fortification intensity of Xichang City is 9 degree. Therefore, the near-field influence coefficient was selected as 1.5, and a seismic isolation design of the structure was carried out with software SAP2000. The maximum value of the earthquake reduction coefficient of inter-story shear force and overturning moment under a moderate earthquake was 0.24, which was significantly reduced compared to the non-isolated structure. The surface pressure and horizontal displacement of the isolated structure subjected to the rare earthquake can satisfy requirements of the design code. A dynamic elastic-plastic time-history analysis of the structure under rare earthquakes was conducted using the program ABAQUS, and the results showed that the structure could meet the objective of no collapse under a severe earthquake.
An isolation design and seismic performance analysis of the rubber bearing for a reinforced concrete high-rise shear wall structure in Xichang City were performed in the study. A buried fracture zone, the secondary fault of the Zemuhe fault is in the east of the engineering site, and the seismic fortification intensity of Xichang City is 9 degree. Therefore, the near-field influence coefficient was selected as 1.5, and a seismic isolation design of the structure was carried out with software SAP2000. The maximum value of the earthquake reduction coefficient of inter-story shear force and overturning moment under a moderate earthquake was 0.24, which was significantly reduced compared to the non-isolated structure. The surface pressure and horizontal displacement of the isolated structure subjected to the rare earthquake can satisfy requirements of the design code. A dynamic elastic-plastic time-history analysis of the structure under rare earthquakes was conducted using the program ABAQUS, and the results showed that the structure could meet the objective of no collapse under a severe earthquake.
引文
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[10] 阮祥,程万正,乔惠珍,等.安宁河—则木河地震带震源参数及应力状态的研究[J].西北地震学报,2011,33(1):46-50.RUAN Xiang,CHENG Wanzheng,QIAO Huizhen,et al.Research on Source Parameters and Stress State in Anninghe-Zemuhe Earthquake Belt[J].Northwestern Seismological Journal,2011,33(1):46-50.
[2] 王栋,吕西林,刘中坡.不同高宽比基础隔震高层结构振动台试验研究及对比分析[J].振动与冲击,2015,34(16):109-118.WANG Dong,Lü Xilin,LIU Zhongpo.Shaking Table Test and Comparison Analysis for Base-isolated High-rise Buildings with Different Aspect Ratios[J].Journal of Vibration And Shock,2015,34(16):109-118.
[3] MAKRIS N,CHANG S P.Effect of Viscous,Viscoplastic and Friction Damping on the Response of Seismic Isolated Structures[J].Earthquake Engineering & Structural Dynamics,2000,29(1):85-107.
[4] CECCOLI C,MAZZOTTI C,SAVOIA M.Non-Linear Seismic Analysis of Base-Isolated RC Frame Structures[J].Earthquake Engineering & Structural Dynamics,1999,28(6):633-653.
[5] WOLFF E D,IPEK C,CONSTANTINOU M C,et al.Effect of Viscous Damping Devices on the Response of Seismically Isolated Structures[J].Earthquake Engineering & Structural Dynamics,2015,44(2):185-198.
[6] CALUGARU V,PANAGIOTOU M.Seismic Response of 20-Story Base-Isolated and Fixed-Base Reinforced Concrete Structural Wall Buildings at a Near-Fault Site[J].Earthquake Engineering & Structural Dynamics,2014,43(6):927-948.
[7] SHI Y D,KURATA M,NAKASHIMA M.Disorder and Damage of Base-Isolated Medical Facilities when Subjected to Near-Fault and Long-Period Ground Motions[J].Earthquake Engineering & Structural Dynamics,2014,43(11):1683-1701.
[8] LU X L,WANG D,WANG S S.Investigation of the Seismic Response of High-Rise Buildings Supported on Tension-Resistant Elastomeric Isolation Bearings[J].Earthquake Engineering & Structural Dynamics,2016,45(13):2207-2228.
[9] CARDONE D,FLORA A.An Alternative Approach for the Seismic Rehabilitation of Existing RC Buildings Using Seismic Isolation[J].Earthquake Engineering & Structural Dynamics,2016,45(1):91-111.
[10] 阮祥,程万正,乔惠珍,等.安宁河—则木河地震带震源参数及应力状态的研究[J].西北地震学报,2011,33(1):46-50.RUAN Xiang,CHENG Wanzheng,QIAO Huizhen,et al.Research on Source Parameters and Stress State in Anninghe-Zemuhe Earthquake Belt[J].Northwestern Seismological Journal,2011,33(1):46-50.