问题：
[问答题]什么是结构构件延性破坏？什么是脆性破坏？在可靠指标上是如何体现它们的不同？
参考答案：
结构构件发生破坏前有预兆，可及时采取弥补措施的称为延性破坏；结构发生破坏是突然性的，难以补救的称为脆性破坏。
延性破坏的目标可靠指标可定得低些，脆性破坏的目标可靠指标定得高些。
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