新型改性竹筋混凝土偏压柱力学性能试验研究

Experimental Research on the Mechanical Property of New Modified Bamboo Reinforced Concrete Columns Under Eccentric Load

为改善竹筋混凝土构件中原性主材存在的耐久性差、与混凝土黏结性能差、抗拉强度离散性大等不足,本文提出两种新型竹筋改性方法,并对采用不同改性处理方法、不同竹筋率的竹筋混凝土柱在不同偏心距的单调荷载作用下的力学性能及影响因素进行了试验研究.研究结果表明:竹筋混凝土偏心受压柱的破坏均为脆性破坏,混凝土压碎破坏为相对安全的破坏形式;两种改性方法均能较大程度地改善竹筋混凝土柱的力学性能,改性以后的竹筋与混凝土之间能较好地协同工作,其变形能较好地满足平截面假定的要求.

To overcome the disadvantage of bamboo reinforcement in concrete members,such as poor durability,poor bond performance with concrete and large strength discreteness,two new modification methods are proposed in this paper.The experimental researches on the mechanical property of bamboo reinforced concrete columns under monotonic eccentric loads are conducted,and the influence of different modification methods,bamboo reinforcement ratio,and eccentricity are studied.The results show that the failure modes of bamboo reinforced concrete columns under eccentric load are brittle failure,and the crushing of concrete is a relatively safe failure mode.Both of the two new modification methods can improve greatly the mechanical property of bamboo reinforced concrete columns,the modified bamboo reinforcement can work together with concrete,and its deformation can meet the requirement of plane section assumption.