At last distribution functions of load modes in life service are presented . based on the resisting force model and load model , the limit state equations of rc bridge are formulated . according to the resisting force is time - dependent and vehicle load is the non - gaussian distribution , jc method is applied to calculate the time - dependent reliability index of rc bridge 在抗力衰减模型及桥梁荷载模型的基础上，将可靠度理论引入桥梁结构的评定中，推导出了桥梁结构耐久性极限状态方程，并根据耐久性极限状态方程中抗力是时间的函数，以及车辆荷载为非正态分布的特点，应用当量正态法( jc法)编制相应的程序计算桥梁构件的时变可靠度指标。
All records are classified into three site conditions . for the two components of a record , two energy equivalent spectra are calculated , and the geometric mean of the two spectra are adopted to analysis by two - stage regression method using an attenuation model . then the attenuation law is attained 对每一条记录，取了两个分量所计算的能量谱的几何平均值，选择了衰减模型，利用两步回归法，对这些能量等效速度谱做了统计拟合分析，得出了地震动四种能量反应谱随震级、距离等参数的衰减规律。
With the increasing of temperature , the mineral catalytic effect is losing quickly , and completely lost above 1200 ( c , which agrees with the results by other researchers . the study of residual carbons from cfb fly ashes and its comparison with pyrolysis chars have confirmed both deactivation and ordering of turbostratic carbon 本文建立了一个简单的焦碳反应性衰减模型，将此模型用在一个一维的cfb基本模型中，给合在一个小型热态cfb实验台的燃烧实验，考察了模型对飞灰含碳量的预测受焦碳失活的影响。
