因此有必要通过实验及理论研究等工作，对公路桥梁伸缩装置进行疲劳破坏机理分析和疲劳寿命估算。
Therefore, it is necessary to analyze the mechanism of the fatigue damage of bridge expansion device and estimate its fatigue life by theories and experiment.
国内外针对土石坝漫顶破坏机理和溃决过程开展了大量的研究工作，但针对黏土心墙这一土石坝主要坝型溃决机理及溃决过程的研究工作却开展的很少。
Many researches on the mechanism of earth-rock DAMS due to overtopping failure and the process of break development have been carried out, but few involves the mechanism of clay core DAMS.
至今人们对结构在地震力作用下的倒塌破坏机理都不是很清楚，这历来一直是地震工作者和土木工作者研究的重要课题。
Now the collapse mechanism of structure has not been clear, which has been a key project for earthquake researcher and civil engineer worker.
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