Creep-Induced Secondary Moments in Timber Beam-Columns

木梁柱中蠕变引起的二次力矩

• 批准号: 9634925
• 负责人: Kenneth Fridley
• 金额: --
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-03-15 至 2001-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9634925&HistoricalAwards=false
• 关键词: Creep; Induced; Secondary; Moments; Timber

9634925 Fridley Wood structures are subject to sustained dead and live loads, and the creep response of the wood under sustained loads tends to increase deflections over time. The transverse deflections in wood beam-columns will likewise increase under sustained load due to creep, thus increasing secondary moments. Creep has long been acknowledged as a factor which must be considered in the design of wood structures; however, the effect of creep on the combined load behavior of wood members has not been studied adequately nor has the effect been included in design equations. The objectives of this research, are to (1) experimentally evaluate and model the effect of creep on the combined load behavior of structural wood members, (2) evaluate the subsequent effect on member reliability, and (3) propose factors for use in design equations to account for such behavior. ***

9634925弗里德利木结构承受持续的恒载和活载，并且木材在持续载荷下的蠕变响应倾向于随时间增加挠度。木梁柱的横向挠度在持续荷载作用下由于蠕变也会增加，从而增加次弯矩。徐变长期以来一直被认为是木结构设计中必须考虑的一个因素;然而，徐变对木构件组合荷载行为的影响尚未得到充分研究，也没有将其纳入设计方程。本研究的目的是（1）实验评估和模拟蠕变对结构木构件的组合载荷行为的影响，（2）评估对构件可靠性的后续影响，以及（3）提出设计方程中使用的系数，以说明此类行为。***