钢筋混凝土悬臂梁抗弯性能尺寸效应试验研究
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摘要
现行钢筋混凝土结构分析理论主要基于缩尺构件试验研究结果,对于实际工程所使用的大尺寸构件而言,其安全性有待验证。本文针对钢筋混凝土梁构件抗弯承载及其变形性能,开展一组不同截面尺寸相似构件的尺寸效应试验研究。构件剪跨比约等于4,以弯曲变形为主,最大试验梁截面高1米。实测结果表明:就钢筋混凝土受弯构件而言,随构件尺寸增大,其承载和变形储备能力亦随之增大,表现出显著的正面尺寸效应。此外,对构件开展变形分析时,要考虑多种因素对各种变形成分的影响。就弯曲变形成分而言,在评价塑性铰区域的塑性转动能力时,鉴于其尺寸效应规律存在显著差异,宜根据评价目标不同,按对应承载状态分别评价。
Analysis theories of RC structures at presents are mainly based on test results of small size components.For large size components used in engineering structures,its safety needs to be verified. The paper is carried out experimental researches on size effect of flexural performance of RC cantilever beams. Section height of the biggest test beam is 1 meter,shear span ratio is 4. It is shown that strength and ductility reserves of RC flexural member are becoming bigger with size increasing,which show significant positive size effect. In addition,it is necessary to consider various deformation compositions which are decided by multi-factors at deformation analyzing. For bending deformation composition,rotation ability of plastic hinge has significant size effect. Due to different evaluation target,plastic rotation ability should be analyzed according to corresponding loading state.
引文
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