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首页> 外文期刊>International journal of steel structures >Coupling Effect of Nodal Deviation and Member Imperfection on Load-Carrying Capacity of Single-Layer Reticulated Shell
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Coupling Effect of Nodal Deviation and Member Imperfection on Load-Carrying Capacity of Single-Layer Reticulated Shell

机译：节点偏差和构件缺陷对单层网状壳承载能力的耦合效应

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摘要

Single-layer reticulated shell is sensitive to imperfections. To clarify the effect of member imperfection, nodal deviation and their couplings on load-carrying capacity of reticulated shell, the equivalent load method (ELM) is developed in the present study to establish single-layer reticulated shell with random member imperfection, and its realization procedures in FEM package are well-elaborated. The main conclusions are summarized as follows: the proposed ELM is of high efficiency to form member imperfection in space structures. For reticulated shell only with member imperfection, the limit load is more or less influenced by member imperfection. With the increase of amplitude of member bow imperfection, limit load gradually decreases. Load-carrying capacity of reticulated shell with larger amplitude of bowed member is more sensitive to bending direction of bowed member than the one with smaller amplitude. Load-carrying capacity of the reticulated shell considered is extremely sensitive to nodal deviation. For reticulated shell with nodal deviation and member imperfection, the effect of member imperfection on load-carrying capacity is closely related to the magnitude of nodal deviation. Load-carrying capacity of shell with smaller nodal deviation is obviously affected by member imperfection, while not sensitive to member imperfection for reticulated shell with larger one. Member imperfection can be neglected when nodal deviation is large enough. Load-carrying capacity of reticulated shell is also influenced by bending angle of bowed member. On the whole, load-carrying capacity of reticulated shell with larger amplitude of member imperfection is more sensitive to bending direction than the reticulated shell with smaller one.
机译：单层网状壳对缺陷敏感。为了阐明构件缺陷，节点偏差及其对传网壳的承载能力的效果，在本研究中开发了等效的负载方法（ELM），以建立单层网状壳，随机构件缺陷，实现有组织中的程序很好地精心制作。主要结论总结如下：提出的ELM具有高效率，以在空间结构中形成成员缺陷。对于仅具有成员缺陷的网状壳，限制负荷或多或少受成员缺陷的影响。随着成员屈服幅度的增加，限制负荷逐渐减少。具有较大凸起的网状壳的承载能力与凸起构件的弯曲方向比具有较小幅度的弯曲构件更敏感。被认为的网状壳的承载能力对节点偏差非常敏感。对于具有节点偏差和构件缺陷的网状壳，成员缺陷对承载能力的影响与节点偏差的大小密切相关。具有较小节点偏差的壳体的承载能力显然受到成员缺陷的影响，而对网状壳的成员缺陷不敏感，具有较大的壳体。在节点偏差足够大时，会员缺陷可以忽略。网状壳的承载能力也受到弯曲构件的弯曲角度的影响。总的来说，具有较大幅度的网状壳的承载能力与弯曲方向更敏感，而不是较小的弯曲方向。

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