Creep-Induced Secondary Moments in Timber Beam-Columns

9634925弗里德利木结构承受持续的静荷载和活荷载，木材在持续荷载下的蠕变响应往往会随着时间的推移而增加挠度。在持续荷载作用下，木质梁柱的横向挠度也会因蠕变而增大，从而增加次弯矩。蠕变一直被认为是木结构设计中必须考虑的一个因素，然而，蠕变对木构件组合受力性能的影响还没有得到充分的研究，也没有将这种影响包含在设计公式中。本研究的目的是(1)通过试验评估和模拟蠕变对结构木构件组合受力性能的影响，(2)评估蠕变对构件可靠性的影响，以及(3)提出用于考虑这种行为的设计公式中的系数。***

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. ***