Shear behavior of RC members without shear reinforcement – development of a consistent experimental, analytical and numerical characterization methodology

无抗剪钢筋的 RC 构件的抗剪性能 â 开发一致的实验、分析和数值表征方法

• 批准号: 420545423
• 负责人: Professor Dr. Rostislav Chudoba
• 金额: --
• 依托单位: Lehrstuhl und Institut für Massivbau
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/420545423?language=en
• 关键词: Shear; behavior; RC; members; without

Large efforts have been devoted in the past to analyze the shear behavior of RC slabs and beams without shear reinforcement. Albeit a considerable progress has been achieved, a consistent description of the shear zone behavior is still missing. This fact can be documented by an ongoing dispute in the scientific community on the exact role of phenomena governing the shear behavior, on their adequate quantification and their appropriate representation in modeling approaches.The major objective of the proposed research is to fill this gap by developing a new, theoretical and experimental framework that can thoroughly describe the shear failure process. The theoretical framework will consistently capture the elementary mechanisms involved in the shear failure, including (1) crack localization, (2) crack propagation, (3) pressure-sensitive friction of the crack faces due to aggregate interlocking, (4) bond behavior, (5) dowel action, and (6) nonlinear material behavior in the compression zone. The proposed modeling strategy will combine analytical models of the cross section along the critical shear crack (Level I) and enriched finite element model of the shear zone with discrete crack representation (Level II). By representing the elementary mechanisms involved in the shear zone behavior with a different degree of detail and different amount of computational effort, it will be possible to balance trade-off between accuracy and efficiency of the simulation. Successful implementation of the modeling strategy will lead to a very efficient simulation of the shear zone behavior including the accurate prediction of the crack propagation and the quantification of the interacting shear transfer contributions (residual tensile stress, aggregate interlock, dowel action and shear in compression zone) during the entire loading history.Calibration of the developed analytical and numerical models will be performed using a test program with a consistent set of component tests. Besides existing and standardized test setups used to identify the constitutive laws for compression, strain softening, debonding and dowel action, a new test setup for the characterization the aggregate interlock along the crack faces will be developed. The validation of the models at both levels will be provided by a set of reinforced concrete beam tests monitored using high-resolution measuring techniques (DIC).By bringing together the best practices of two disciplines, i.e. structural concrete and numerical mechanics, this research will significantly enhance our insight into the behavior of shear zone behavior. In the long run, it will provide a sound basis for structural design methods with reduced material consumption, extended service life, and increased reliability of engineering structures.

过去，大量努力一直致力于分析RC板和横梁的剪切行为，而无需剪切钢筋。尽管已经取得了很大的进步，但仍然缺少对剪切区行为的一致描述。这一事实可以通过科学界的持续争议记录到有关剪切行为，对其足够的量化以及它们在建模方法中的适当代表性的确切作用的确切作用。拟议研究的主要目的是通过建立一个新的，理论的实验框架来填补这一空白，从而彻底描述剪切失效过程。理论框架将始终捕获剪切故障中涉及的基本机制，包括（1）裂纹定位，（2）裂纹传播，（3）由于骨料互锁的行为，（4）闭合键行为，（5）Dowel Action和（6）压缩区域中的非线性物质行为。提出的建模策略将沿临界剪切裂纹（I级）（I级）和剪切区的富含有限元模型与离散的裂纹表示（II级）结合横截面的分析模型。通过以不同程度的细节和不同程度的计算工作来代表剪切区行为中涉及的基本机制，可以在模拟的准确性和效率之间取消权衡取舍。成功实施建模策略将导致对剪切区行为的非常有效的模拟，包括对裂纹传播的准确预测以及相互作用的剪切转移贡献（残留的拉伸应力，综合互锁，销钉互锁，销钉互锁，销钉和剪切的压缩区域）在整个负载历史上的压缩区）在整个负载历史上使用开发的分析和数字模型的测试均可进行一定的测试。除了用于识别压缩，应变软化，剥离和销钉动作的本构定律的现有和标准化的测试设置外，还将开发出一种新的表征测试设置。通过高分辨率测量技术（DIC）监测的一组钢筋混凝土梁测试（DIC）将提供两个级别的模型的验证。通过将两个学科的最佳实践（即结构混凝土和数值机制）汇总在一起，这项研究将显着增强我们对剪切区行为行为的洞察力。从长远来看，它将为结构设计方法提供良好的基础，这些设计方法降低了材料的消耗，延长的服务寿命以及工程结构的可靠性提高。