Because of the long-term action of load or abrupt disaster under the term of usage, the concrete structure will appear the safety problem and endanger the property and the security of people's life.

在使用期限内，由于长期的荷载作用或突然的灾害，混凝土结构会出现安全隐患，严重的会危及人的生命财产安全。

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On the load increased, but not sensitive to changes in friction coefficient, so heavy, the friction coefficient is extremely small, and the same long-term accuracy can have long-term mechanical life.

对负荷增大，但磨擦系数无敏感变化，因此重负荷下，磨擦系数极小，并且长期保持精度不变，可得机械使用寿命长期保持。

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The pre-embedded approach can resolve the issue of monitoring dead load stress, but the long-term monitoring can not be achieved due to sensor life.

预埋的方式可解决恒载应力的监测问题，但存在因传感器寿命问题而不能实现长期监测；

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