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    莊文娟，朱玉華
    (同濟(jì)大學(xué)土木工程學(xué)院，上海200092)

[摘要] 通過建立鉛芯橡膠隔震支座的ANSYS模型，主要研究了鉛芯橡膠隔震支座(LRB)的等效阻尼比和耗能特性的影響因素。采用鉛芯橡膠支座四分之一模型模擬支座在水平正弦波荷載作用下的滯回曲線，大大縮短了有限元軟件運(yùn)行的時(shí)間，提高效率并獲得較好的結(jié)果。分析結(jié)果表明，LRB的阻尼特性主要與水平剪應(yīng)變、鉛芯直徑有關(guān)。水平位移越大，等效阻尼比越小，能量耗散越大；鉛芯直徑越大，等效阻尼比和能量耗散同時(shí)都增大。分析還表明，豎向面壓、橡膠剪切模量、第二形狀系數(shù)對(duì)阻尼特性的影響很小。可見，在一定的地震烈度下，阻尼的選取主要與鉛芯直徑有關(guān)。
[關(guān)鍵詞] 鉛芯橡膠支座；雙線性滯回模型；等效阻尼比；耗能；鉛芯直徑；ANSYS模型

    Finite element analysis on damping properties oflead-rubber bearings
    Zhuang Wenjuan,  Zhu Yuhua
    ( College of Civil Engineering, Tongji University, Shanghai 200092, China)

Abstract: The equivalent linear damping ratio and the energy dissipation oflead-rubber bearings are studied by finite element simulations of lead-rubber bearings. The FEA program ANSYS is adopted to establish a quarter model of lead-rubber bearing to simulate the hysteretic curve of LRB under the sinusoidal load, which not only reduce the operating time, but also improve the efficiency and show a good agreement with the actual situation. It is demonstrated that the horizontal shear strain and diameter of the lead have a primary influence on damping properties. The results are that the equivalent linear damping ratio decreases, the energy dissipation increases as a result of the horizontal shear stain increasing. And the both properties increase with the diameter of lead increasing. In addition, the damping is almost no affected by compression, shape factor and shear modulus of rubber. Finally, in a certain seismic intensity, it can be seen that the selection of damping mainly relates to the diameter oflead.
Keywords: lead-rubber bearings; equivalent linear damping ratio; bilinear hysteretic model; energy dissipation; the diameter oflead; ANSYS model