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首页> 外文期刊>Bulletin of earthquake engineering >Torsional response of fire-damaged base-isolated buildings with elastomeric bearings subjected to near-fault earthquakes
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Torsional response of fire-damaged base-isolated buildings with elastomeric bearings subjected to near-fault earthquakes

机译：用近断层地震的弹性轴承造成火灾底座 - 隔离建筑物的扭转响应

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Information is lacking on the nonlinear dynamic response of r.c. base-isolated buildings where asymmetries are due to fire-induced lateral stiffness eccentricities in the frame members of the superstructure or in the base-isolation system. To study the seismic response following fire, a numerical investigation is carried out on four-, six- and eight-storey r.c. base-isolated structures composed of a basement and three, five and seven storeys above ground level, respectively. The base-isolation system is constituted of High-Damping-Laminated-Rubber Bearings, inserted on the top of the columns of the basement. Different values of the isolation ratio, defined as the ratio between the fundamental vibration period of the base-isolated and fixed-base structures above the isolation system, and plan-aspect ratio, defined as the ratio between the plan dimensions of the building, are considered. Fire scenarios correspond to the fire compartment confined to the whole (i.e. symmetric case) and half (i.e. asymmetric case) area of the base-isolation level (i.e. basement, F0) and superstructure (i.e. first level, F1) at 30 and 60 min of fire resistance, respectively. A thermal-mechanical mapping analysis is carried out, with reduced mechanical properties of r.c. cross-sections, in line with the 500 A degrees C isotherm method proposed by Eurocode 2, and HDLRBs, in accordance with a proposed 200 A degrees C isotherm method. Finally, the nonlinear dynamic analysis is carried out with reference to near-fault earthquakes selected and scaled on the design hypotheses adopted for the test structures.
机译：信息缺乏R.C的非线性动态响应。非对称的底座建筑物，其中不对称是由于框架构件中的框架构件或在基间系统中的偏心偏心。为了研究火灾后的地震反应，在四层，六楼和八层的R.C中进行了数值调查。基部隔离结构分别由地下水平的地下室和三个，五个和七层组成。基准隔离系统由高阻尼叠层橡胶轴承构成，插入地下室柱顶部。隔离比的不同值，定义为隔离系统上方的基本隔离和固定基础结构的基本振动周期之间的比率，以及平面纵横比定义为建筑物的平面尺寸之间的比率。是经过考虑的。火情况对应于限制在30和60分钟的基本隔离电平（即基底，F0）和上部结构（即第一级，F1）的全部（即对称情况）和半（即不对称情况）区域的火灾隔室（即非对称情况）区域分别耐火。进行热机械映射分析，降低了R.C的机械性能。横截面，与欧元码2和HDLRB提出的500 A摄氏度方法，根据所提出的200°C等温法。最后，参考选择假设的近端故障地震进行非线性动态分析，并在测试结构采用的设计假设上进行。

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