Moment Resistance Performance of Dowel Based Connections in Wood Products

木制品中销钉连接的抗力矩性能

基本信息

  • 批准号:
    RGPIN-2017-04898
  • 负责人:
  • 金额:
    $ 2.04万
  • 依托单位:
  • 依托单位国家:
    加拿大
  • 项目类别:
    Discovery Grants Program - Individual
  • 财政年份:
    2020
  • 资助国家:
    加拿大
  • 起止时间:
    2020-01-01 至 2021-12-31
  • 项目状态:
    已结题

项目摘要

The moment resistance of bolted connections in wood is poor due to the low tension perpendicular to grain and longitudinal shear strengths of wood. As a practical solution designers may sometimes consider such connections as pinned to only carry shear and axial forces and ignore their moment carrying capacity. The problem is that the wood does not know that it is not supposed to carry moment and could perform poorly even under the intended loading. Alternatively, very slender bolts/dowels can be used with large spacing and end distances which may not be very economical. Rational design guidance is needed to allow bolted moment connection to be used efficiently and safely. The fundamental problem is that the interacting effect of shear and tension perpendicular stresses is not well understood for wood and modern wood products. Both modes of failure are brittle in nature and as a natural material the strength properties of wood are nonhomogeneous and random. These features lead to the fact that tensile perpendicular to grain and longitudinal shear strengths are both sensitive to stressed volume. The larger the stressed volume, the lower the strength. Comprehensive data is not available on the effect of stressed volume on these interacting stresses. Furthermore, the influence of reverse cyclic loading on these strength properties as in the case of demands from earthquakes have not been fully studied. The proposed work will study the moment carrying capacity of bolted moment connections under monotonic and reverse cyclic loading as components and in structural frames. The interacting brittle failure mode of tension perpendicular to grain and shear will be studied with consideration of stressed volume effect. This information will lead to design guidance for effective reinforcement techniques. Finally, reliability based design procedures will be developed to qualify their performance to handle demands from both seismic and non-seismic loading. The expected impact of the study is more rational design procedures for consideration of bolted and dowel based moment connections leading to safer and more cost efficient design solutions using generic non-proprietary based connectors. Successful implementation of the results will lead to better and safer wood-based buildings especially for the bigger and taller wood building market.
由于木材的垂直纹理张力和纵向剪切强度较低,木材中螺栓连接的抗弯矩能力较差。作为一种实用的解决方案,设计人员有时可能会考虑将此类连接固定为仅承受剪切力和轴向力,而忽略其力矩承载能力。问题在于木材不知道它不应该承载力矩,并且即使在预期负载下也可能表现不佳。或者,可以使用具有大间距和端部距离的非常细长的螺栓/销钉,但这可能不是很经济。需要合理的设计指导才能有效、安全地使用螺栓力矩连接。根本问题是,对于木材和现代木制品来说,剪切和拉伸垂直应力的相互作用影响尚不清楚。这两种破坏模式本质上都是脆性的,并且作为天然材料,木材的强度特性是不均匀和随机的。这些特征导致垂直于纹理的拉伸强度和纵向剪切强度都对应力体积敏感。受力体积越大,强度越低。目前还没有关于受力体积对这些相互作用的应力的影响的全面数据。此外,在地震需求的情况下,反向循环载荷对这些强度特性的影响尚未得到充分研究。 拟议的工作将研究作为组件和结构框架中的螺栓力矩连接在单调和反向循环载荷下的力矩承载能力。将考虑应力体积效应,研究垂直于纹理的拉力和剪切相互作用的脆性破坏模式。这些信息将为有效加固技术的设计提供指导。最后,将开发基于可靠性的设计程序,以验证其性能,以满足地震和非地震载荷的要求。该研究的预期影响是更合理的设计程序,考虑基于螺栓和销钉的力矩连接,从而使用通用的非专有连接器实现更安全、更具成本效益的设计解决方案。结果的成功实施将带来更好、更安全的木基建筑,特别是对于更大、更高的木建筑市场。

项目成果

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Lam, Frank其他文献

Experimental and numerical study of moisture distribution and shrinkage crack propagation in cross section of timber members
  • DOI:
    10.1016/j.conbuildmat.2019.05.191
  • 发表时间:
    2019-10-10
  • 期刊:
  • 影响因子:
    7.4
  • 作者:
    Chen, Kongyang;Qiu, Hongxing;Lam, Frank
  • 通讯作者:
    Lam, Frank
Experimental test of coupling effect on CLT angle bracket connections
  • DOI:
    10.1016/j.engstruct.2018.05.013
  • 发表时间:
    2018-09-15
  • 期刊:
  • 影响因子:
    5.5
  • 作者:
    Liu, Jingjing;Lam, Frank
  • 通讯作者:
    Lam, Frank
Flexural performance of spliced beam connected and reinforced with self-tapping wood screws
  • DOI:
    10.1016/j.engstruct.2017.08.032
  • 发表时间:
    2017-12-01
  • 期刊:
  • 影响因子:
    5.5
  • 作者:
    Li, Hongmin;Lam, Frank;Qiu, Hongxing
  • 通讯作者:
    Qiu, Hongxing
Application of time-temperature-stress superposition on creep of wood-plastic composites
  • DOI:
    10.1007/s11043-012-9194-9
  • 发表时间:
    2013-08-01
  • 期刊:
  • 影响因子:
    2.5
  • 作者:
    Chang, Feng-Cheng;Lam, Frank;Kadla, John F.
  • 通讯作者:
    Kadla, John F.

Lam, Frank的其他文献

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{{ truncateString('Lam, Frank', 18)}}的其他基金

Moment Resistance Performance of Dowel Based Connections in Wood Products
木制品中销钉连接的抗力矩性能
  • 批准号:
    RGPIN-2017-04898
  • 财政年份:
    2021
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Moment Resistance Performance of Dowel Based Connections in Wood Products
木制品中销钉连接的抗力矩性能
  • 批准号:
    RGPIN-2017-04898
  • 财政年份:
    2019
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Moment Resistance Performance of Dowel Based Connections in Wood Products
木制品中销钉连接的抗力矩性能
  • 批准号:
    RGPIN-2017-04898
  • 财政年份:
    2018
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Moment Resistance Performance of Dowel Based Connections in Wood Products
木制品中销钉连接的抗力矩性能
  • 批准号:
    RGPIN-2017-04898
  • 财政年份:
    2017
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Earthquake resistance of Structa Wire Stucco Shear Wall System Phase 2
Structa钢丝灰泥剪力墙系统二期抗震性能
  • 批准号:
    461960-2014
  • 财政年份:
    2014
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Engage Plus Grants Program
Structural Performance of Timber Connections with Long Self Tapping Wood Screws
长自攻木螺钉木连接的结构性能
  • 批准号:
    203409-2012
  • 财政年份:
    2012
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Earthquake resistance of structa wire stucco shear wall system
结构线灰泥剪力墙体系的抗震性能
  • 批准号:
    435370-2012
  • 财政年份:
    2012
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Engage Grants Program
Performance of Massiv-Holz-Mauer® - Cross laminated timber panels with aluminum nailing
Massiv-Holz-Mauer® 的性能 - 带铝钉的交叉层压木板
  • 批准号:
    428955-2011
  • 财政年份:
    2011
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Engage Grants Program
Reliability of timber structural system under seismic loading
地震荷载下木结构体系的可靠性
  • 批准号:
    203409-2007
  • 财政年份:
    2011
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual
Reliability of timber structural system under seismic loading
地震荷载下木结构体系的可靠性
  • 批准号:
    203409-2007
  • 财政年份:
    2010
  • 资助金额:
    $ 2.04万
  • 项目类别:
    Discovery Grants Program - Individual

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