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预应力损失怎么产生的?有什么影响?

发布时间:2015-9-10 9:33:12 浏览次数:604




预应力损失主要来源于4个方面。

一是钢索、拉杆在受力状态下,长度增加导致松弛;
二是锚具、垫板压实而产生的位移;
三是多束钢索排序张拉时,后序索张拉对前序索内力的削弱影响;
四是折线和曲线拉索在端头、折点等处,因接触面摩阻力而产生的影响。
上述4种预应力损失是可知可计的,都可以在张拉过程中补偿。结构服役后的材料徐变影响,环境温度变化影响,机械损伤后的形变影响等,都是钢结构预应力损失健康监测的主要内容。
因为预应力是结构体系中的一个自平衡力系。如果出现预应力损失,力系必定重新调整达到新的平衡,因此引起一些杆件内力增长,则可能是有害的。

所以,判断预应力损失对那些杆件产生增加内力的影响至关重要。这也是预应力钢结构在服役期间必须定期检测的主要原因。


The loss of prestress mainly comes from four aspects.

One is wire, rod under stress, increased lead to relaxation length;

Second, the anchorage, compaction and the displacement of the plate;

Three sort is more bundle of wire rope tension, after order the cable tensioning weaken the effect of antecedent cable internal force;

Four is broken line and curve line in the end, the place such as fold point, due to the contact friction and impact.

The above four kinds of loss of prestress is known to meter, can be in the process of tension compensation. Structure of material creep effect after service, environment temperature, the deformation after mechanical damage effect and so on, are the main content of the loss of prestress steel structure health monitoring.

Because of the prestressed is a from the balance state of structure system. If there is a loss of prestress, the force system will be reset to a new equilibrium, so caused some bar internal growth and could be harmful.

So, judge the loss of prestress increase internal force of the impact on the bar is very important. This is must be tested periodically during the period of prestressed steel structures in service.


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