但是由于外界环境等因素的影响，桥梁结构不可避免地出现损伤积累和抗力衰减。
Inevitably, the bridge structure was damaged and its resistance was attenuated duo to the destroy effect of environment.
分析了腐蚀环境对结构抗力的影响、抗力衰减模型、地震危险性、地震对结构的作用。
Influence of corrosive environment on structural resistance, resistance decrease model, seismic risk and seismic effect on structures are analyzed.
在抗力衰减模型及桥梁荷载模型的基础上，推导出了损伤状态下桥梁结构承载力极限状态方程。
Derives limit condition equation of bridge loading capacity under damnification status on the basis of resisting force model and loading model.
分析斜拉桥结构动态可靠度时，目前抗力衰减预测的基本模型经验性都很大，对具体结构并不一定适用。
Prediction of resistance deterioration is an important part of time-dependent reliability analysis of cable-stayed bridge.
分析斜拉桥结构动态可靠度时，目前抗力衰减预测的基本模型经验性都很大，对具体结构并不一定适用。
The reliability of an existing structure mainly depends on three factors, namely, the resistance degradation, the resistance posterior distribution and the live load.
同时随着混凝土冻融次数的增加，抗力将逐渐衰减。
With the increasing times of freezing-thawing circle, resistance of concrete is decreasing.
同时随着混凝土冻融次数的增加，抗力将逐渐衰减。
With the increasing times of freezing-thawing circle, resistance of concrete is decreasing.
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