摘要
本文主要讨论了小比例模型结构构件试验研究中的相似性问题。通过一组不同比例尺寸钢筋砼柱在循环荷载作用下性能的试验观察与分析对比,可以认为,在一定比例尺寸范围内,如果模型结构构件能较好地满足相似设计的各项基本要求,则模型所表现的实验性能可以代表原型结构的情况。由于客观上要实现材料及各项力学指标的完全相似性是困难的,因而在模型试验时,亦应对可能出现的不相似因素及其对实验结果的影响作充分的估计,唯有如此,才能对模型试验加以去伪存真的认识。文中还对与粘结滑移性能密切相关,且在模型实验中具有重要影响的所谓“固端转角”现象,作了一些初步的讨论。
The similitude correlations in experimental studies of RC nonlinear hysteresis behavior by using scaled test models are primarily d iscussed. For this study,a series of RC column members were constructed at small or medium-to-large scales,and tested under reversals of lateral force.The small-scale specimens were managed to use standard deformed steel bars to ensure more realistic similitude observations related mainly to scales. Results exhibited much improved response of the small-scale specimens in comparison with previous model tests due to enhanced bond conditions. It is believed that minor deviations between responses of the small-scalespecimens and the normal-concrete specimens can be further reduced provided other similitude design requi rements are better satisfied. Evidences also showed that the pull-out and pushin of reinforcement at mating member faces, which in relative give rise to the so-called'f ixed-end rotation' , can significantly contribute to the response of RC members.A precise definition of the curvature level at the critical section is essential for experimental evaluation of local ductility and plastic hinge length.
出处
《建筑结构》
CSCD
北大核心
1994年第9期13-23,共11页
Building Structure
关键词
钢筋混凝土
柱
循环载荷
性能
reinforced concrete, test model,similitude,cyclic load,bond, slip, curvature, ductility, plastic hinge
