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梁、墙连接关系
创建者:曾亚,编辑者:曾亚,最近更新:2017/08/16 14:44:04
问题描述:
如图1所示,模拟梁与剪力墙面外搭接的情况。对墙指定网格剖分(如图2),墙体剖分效果如图2所示,查看分析模型发现梁端处壳边没有对应的剖分点。请问,程序如何处理这种情况保证梁、墙之间连接关系,是否需要在搭接处对剪力墙手动进行分割处理?
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图1 梁、墙搭接关系图 2 剪力墙网格剖分效果
图3 墙网格剖分选项
解答:
程序可自动处理【问题描述】中梁、墙间的连接关系。默认情况下,自动边约束指定给模型中所有墙、楼板对象(如图4)。自动边约束用于协调壳对象公共边剖分网格节点不匹配的情况;同时,可以使线单元与剖分稀疏的壳单元相连。故对于上述分析模型,虽然在梁端处没有对应的剖分点,但程序默认指定的自动边约束功能,可以保证墙边与梁端的连接关系。
图4 自动边约束
当然,对墙体进行分割与梁端形成共节点,这种方式得到的结果是最准确的。下面,对比分别采用自动边约束和分割墙体方式的计算结果。
【方式一】:自动边约束 【方式二】:分割墙体
图5 模型对比
查看相同荷载工况下,两种方式的梁端节点位移结果(如图6)。可以看出,使用自动边约束得到的位移结果与网格对齐的结果基本一致。
图6 对比位移结果
查看相同荷载工况下,壳应力结果(图7)及梁弯矩结果(图8),可以看出使用自动边约束无法保证壳单元局部应力的精度,只能保证结构整体准确的计算结果。
【方式一】:自动边约束 【方式二】:分割墙体
图7 壳应力结果
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图8 梁弯矩结果
基于上述分析,如果用户并不关注构件局部结果,则推荐使用自动边约束提供的便捷功能。若用户关注构件局部受力情况,则建议采用分割墙体的方式。