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强墙肢弱连梁设计时要注意些什么？

强墙肢弱连梁设计时要注意些什么？

浏览：32次 | 提问时间： 07-29 05:33

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久梦 07-29 05:34

强墙肢弱连梁设计时要注意：加连梁跨度减少高度。在连梁设计中，刚度折减后，仍可能发生连梁正截面受弯承载力或斜截面受剪承载力不够的情况，这时可以增加洞口的宽度，以减少连梁刚度。减少了结构的整体刚度，也就减少了地震作用的影响，使连梁的承载力有可能不超限。如果只是部分连梁超筋或超限，则可采取调整连梁内力来解决。调整的幅度不宜大于20%，且连梁必须满足“强剪弱弯”的要求。
增加剪力墙厚度。亦即增加连梁的截面宽度，其结果一方面由于结构整体刚度加大，地震作用产生的内力增加，另一方面连梁的受剪承载力与宽度的增加成正比。由于该片墙厚增加以后，地震所产生的内力并不按墙厚增加的比例分配给该片剪力墙，而是小于这个比例，因此有可能使连梁的受剪承载力不超限。
提高混凝土等级。混凝土等级提高后，结构的地震作用影响增加的比例远小于混凝土受剪承载力提高的比例，有可能使连梁的受剪承载力不超限。

卡卡 07-29 05:42

1、关于连梁刚度的折减。连梁由于跨高比小，与之相连的墙肢刚度大等原因，在水平力作用下的内力往往很大，连梁屈服时表现为梁端出现裂缝，刚度减弱，内力重分布。因此在开始进行结构整体计算时，就需对连梁刚度进行折减。根据《钢筋混凝土高层建筑结构设计与施工规程》第417条规定：“在内力与位移计算中，所有构件均可采用弹性刚度，在框架—剪力墙结构中，连梁的刚度可予以折减，折减系数不应小于0.55.”一般在实际设计中我们在0.55—1之间取值，以符合截面设计的要求。

如从未遇上 07-29 05:51

一、所谓“连梁”，一般是指剪力墙上开洞形成的墙肢之间的类似“梁”一样的连接段，一般其跨高比<5，(对于跨高比>6者称为弱连梁)。
二、连梁在内力和位移计算时，考虑抗震设计时其刚度可予以“折减”，折减系数不宜小于0.5；对非抗震设计时或者结构的内力组合、位移由风荷载起控制作用时，折减系数的取值应慎重。
三、连梁截面尺寸不满足混凝土高规7.2.23条要求时，可按照7.2.25条处理；
四、连梁的腰筋：严格执行混凝土高规7.2.26条的强条要求，特别对深连梁其腰筋的配筋率不小于0.3%。
五、抗震等级为一、二级剪力墙的连梁，当其跨高比不大于2且墙厚度不小于200mm时，宜另行设置斜向交叉构造钢筋。
六、原则上连梁不能作为楼面主梁的支座，主要目的是为了避免连梁的破坏造成主梁及其楼板较大面积的坍塌或较大竖向变形影响使用；当建筑功能要求必须这样处理时，必须采取措施对该连梁进行加强。主要加强连梁的配箍率，增设斜向构造钢筋；加大连梁腰筋的配筋率；另外，要求对连梁进行简支梁模型的抗弯计算；应当注意到，作为楼面主梁支座的连梁断面较大，应注意连梁两侧墙肢要加强配筋。

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