什么是钢筋混凝土连续梁塑性内力的充分重分布?

2024-12-03 05:28:08
推荐回答(2个)
回答1:

钢筋混凝土连续梁在荷载作用下能按照预期的顺序出现塑性铰,形成破坏机构,其承载力达到预计的极限荷载,则称为内力的充分重分布。但由于钢筋混凝土截面的塑性转动能力是有限度的,其限度与配筋率有关。如果选定的内力重分布幅度过大,它所需要的塑性转角超过了该截面的塑性转动能力,则在没有形成预期的破坏机构之前,该截面即由于混凝土达到极限压应变而过早破坏,降低极限荷载。实现内力充分重分布的条件是内力重分布的幅度必须与截面塑性转动能力相适应。设计时可用控制调幅不大于25%、梁端截面受压区相对高度不应超过0.35来实现。

回答2:

为了保证截面具有较大的塑性转动能力,宜采用流幅大的钢筋,截面相对受压高度ξ应满足:0.1≤ξ≤0.35要求 构件在塑性内力重分布过程中不能发生其他脆性破坏,如斜截面受剪破坏,钢筋锚固破坏等调幅幅度不应大于30%。

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