基于可靠性的桥梁高阻尼橡胶支座减震性能及设计理论研究

In view of the lack of traditional seismic design thoughts, the domestic scholars and engineers has gradually pay more attention to the aseismic design of bridge. As a new kind of damping device, high damping rubber bearing is better than lead rubber bearing in terms of environmental protection, meanwhile it has a good aseismic effect. But related research about this bearing is still at the exploration stage in our country, common constitutive model of high damping rubber bearing can't reflect its mechanical properties under the influence of some related factors, and its aseismic design method is still based on experience mainly. Those restrict its popularization and application in engineering. Aiming at the shortcomings of the domestic research, this project intends to do some correlation tests under shear strain of high damping rubber bearing, and modify the numerical analysis model with the measured data, puts forward the simplified constitutive model of better applicability. At the same time, the key design parameters of high damping rubber bearing in domestic manufacturers were analyzed, to determine the probability distribution and numerical characteristics. Then consider different earthquake intensity and site types, stochastic finite element method was adopted to analyze the dynamic time history of actual engineering and get reliability index and failure probability of this structure. Compared with the result of deterministic analysis, the aseismic design method of high damping rubber bearing is established based on the reliability theory. The results of this research will provide the high damping rubber bearing with theoretical basis and technical support, and develop the research and application about this kind of bearing in our country.

鉴于传统抗震设计思想的不足，国内已逐步重视桥梁结构的减震设计。高阻尼橡胶支座作为一种新的减震装置，比传统铅芯橡胶支座更环保，并且具有良好的减震效果。但我国的相关研究尚处于探索阶段，所采用的本构模型不能反映高阻尼橡胶支座在各相关因素影响下的力学性能，并且其减震设计方法还是以经验为主，制约了其在工程中的推广应用。本项目针对国内研究的不足，拟对高阻尼橡胶支座进行不同条件下的水平性能相关性试验，结合实测数据对数值分析模型进行修正，提出适用性较好的简化本构模型。同时对高阻尼橡胶支座的关键设计参数进行统计分析，确定其概率分布及数值特征。然后考虑不同地震强度及场地类型，结合实际算例进行随机有限元动力时程分析，求解结构的可靠性指标及失效概率，并与确定性分析方法进行对比，建立基于可靠度理论的高阻尼橡胶支座实用减震设计方法。本项目的研究成果将为高阻尼橡胶支座在我国的研究和应用提供理论依据及技术支撑。

本课题针对HDR支座国内研究的不足，对国内生产厂家高阻尼橡胶支座的关键设计参数（剪切模量、水平等效刚度、等效阻尼比）进行统计分析，确定其概率分布及数值特征。对高阻尼橡胶支座进行剪应变相关性试验，得到了不同压应力、剪应变、加载频率、温度条件下高阻尼橡胶支座的水平等效刚度及等效阻尼比拟合公式。然后考虑不同地震强度及场地类型，结合实际算例进行随机有限元动力时程分析，求解结构的可靠性指标及失效概率，并与确定性分析方法进行对比分析，建立基于可靠度理论的高阻尼橡胶支座减震设计方法。本项目的研究成果将为高阻尼橡胶支座在我国的研究和应用提供理论依据及技术支撑。项目资助发表核心论文7篇，SCI论文2篇，待发表2篇。培养硕士生3名，其中2名已取得硕士学位，1名在读。项目投入经费25万元，已支出10.3619万元，未付经费10.7571万元，实际剩余经费3.881万元。各项支出基本与预算相符，，剩余经费计划用于本项目的后续研究。