Study on Heat-Mechanics Interaction Behavior of Base Isolation Devises and Damage Control design method for Long Life Base-isolated building

由于海沟强震引起的长周期地面运动，附着在基础隔离建筑物上的基础隔离装置可能遭受比预期更大、更多的循环变形。铅橡胶支座（LRBs）和高阻尼橡胶支座（HDBs）吸收的地震能量从根本上转化为热能。这将导致产生热量，从而导致引线塞和高阻尼橡胶中的高温。随着温度的升高，基础隔震建筑的阻尼特性的恶化和响应值的增加是人们严重关注的问题。为了阐明基底隔震装置在更大、更频繁的循环变形下的热行为影响，本文进行了分析和实验研究。得出或开发了以下项目：(a)受长周期地面运动影响的基础隔离建筑的响应特性；(b)考虑更大和更多循环变形的LRBs和HDBs的载荷试验；(c)应用正向差分法对橡胶支座进行传热分析；(d)考虑热力相互作用行为的基础隔震建筑地震反应分析方法。结果摘要如下所示。得到了大量的实验数据，揭示了在较大、较大的循环变形作用下，基底隔振装置的温度变化和滞回特性。研究了考虑橡胶支座热-力相互作用的基础隔震建筑地震反应值的估计方法。研究发现，在地震运动特征与基础隔震建筑一致的情况下，温升的影响不可忽视，这是基础隔震建筑在重要使用中需要注意的问题。

Base-isolaton devices attached to base-isolated buildings can be subjected to larger and more cyclic deformation than anticipated due tolong-period ground motion caused by strong earthquakes in oceanic trenches. The seismic energy absorbed by the lead rubber bearings(LRBs) and high damping rubber bearings(HDBs) is fundamentally transformed into thermal energy. This leads to heat generation, which causes high temperatures in the lead plug and the high-damping rubber. The deterioration of damping characteristics and the increase of response values for base-isolated buildings in line with rising temperatures are serious concerns. In this paper, to clarify the effects of heat behaviors of base-isolation devices subjected to larger and more cyclic deformation, analytical and experimental studies were conducted. Following items were earned out or developed : (a) response characteristics of base-isolated buildings subjected to long-period ground motion ; (b) loadong tests on LRBs and HDBs considering larger and more cycbc deformation ; (c) a heat transfer analysis method of rubber bearings by apptying the forward difference method ; (d) an earthquake response analysis method of base-isolated buildings considering heat-mechanics interaction behavior. The summary of the results is shown below.1. A lot of experimental data were obtained about changes of temperature and hysteresis charactenstcs on the base-isolation devices subjected to larger and more cyclic deformation.2. Estimation methods for earthquake response values of base-isolated buildings considering heat-mechanics interaction behaviors of the rubber bearings were developed.3. It was found that effects of temperature increase should not be ignored if charactenstics of earthquake motions accord to those of base-isolated buildings, which was a notable problem for base-isolated buildings on important use.