铝合金受弯构件整体稳定性的试验研究

Experimental study on the lateral stability of aluminum bending members

通过试验研究工字型铝合金挤压构件在纯弯荷载作用下的整体稳定性。构件的材料包括两种:6061-T6和6063-T5,分别代表弱应变强化合金与强应变强化合金。构件截面包括双轴对称与单轴对称两种类型,构件的端部严格约束了侧向的转角。试验过程中荷载持续增加,直至达到构件承载力峰值。试验共测量了40根铝合金梁在纯弯荷载下的稳定承载力,铝合金梁的破坏形式涵盖了弹性失稳和弹塑性失稳。材性拉伸试件分别从每种材料的铝合金梁的翼缘和腹板上切取,共进行了8组试验。并且把试验结果与早期研究得到的计算方法相比较,证明了计算方法的准确性。

An experiment was conducted on extruded I-section aluminum beams to study their lateral stability under pure bending. The alloy and temper of these beams were 6061-T6 and 6063-T5, representing weak hardening and strong hardening alloys, respectively. The sections of the members have equal or unequal flanges. The ends of these beams were restrained against bending in the lateral direction. The loading was continued until the peak response of the beams was reached. Forty tests were conducted to study the carrying capacity of aluminum beams under pure bending. The beams had collapsed by lateral buckling in both the elastic and the plastic ranges of the material. Tensile tests were made on 8 specimens cut from the flanges and the webs of each type of beams. The test data were compared with the results from a design method proposed in a previous study for verification.