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评估钢结构构件的材质和细部构造在极限荷载作用下的无弹性需求范围。描述了对非弹性有要求部位(屈服应力相对较低的钢板和接头全部焊透的对接焊缝细部构造)的循环响应和低周循环疲劳寿命,对不同的基底材质和对接试样进行大振幅循环应变试验,设计了多种焊接方式来缓和焊接试样的应力集中现象、降低其残余应力、改善焊趾外观。采用单轴材料模型和低周疲劳模型描述试样的循环应力-应变响应和低周循环疲劳寿命。研究表明,线性累积损伤模型也适用于预测不同应变历史下试样的破坏情况。对接焊缝仅略微降低试样的低周循环疲劳寿命,不同的焊接方式对低周循环疲劳寿命的影响最小。
Assess the inelastic range of material and detail construction of steel structural members under the ultimate load. Describes the cyclic response and low-cycle fatigue life of a non-elastically deformable part (a butt weld detail welded steel plate with a relatively low yield stress) and a low-cycle fatigue life, with different base material and butt specimens Cyclic strain test, designed a variety of welding methods to ease the stress concentration of welded specimens, reduce its residual stress, improve weld toe appearance. The uniaxial material model and the low cycle fatigue model are used to describe the cyclic stress-strain response and low-cycle fatigue life of the specimens. Research shows that the linear cumulative damage model is also suitable for predicting the failure of specimens under different strain history. The butt weld only slightly reduces the low-cycle fatigue life of the sample, and the different welding methods have the least impact on the low-cycle fatigue life.