In-plane Performance of Concrete Masonry Shear Walls

混凝土砌体剪力墙的面内性能

• 批准号: RGPIN-2014-06594
• 负责人: Lissel, Shelley
• 金额: $ 1.46万
• 依托单位: University of Calgary
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=567913
• 关键词: plane; Performance; Concrete; Masonry; Shear

Shear walls are essential structural components in structural masonry and other types of buildings that resist lateral loads due to wind or earthquakes. In significant seismic events, shear walls are responsible for maintaining structural integrity and preventing total collapse of a building even if other walls or non-structural components collapse. Thus efficient and safe design of these structural members is very important. The overall aim of the proposed research program is to provide improved guidance for the design and strengthening of masonry shear walls by developing an improved model for in-plane shear which is applicable to various masonry forms. The proposed research is multi-faceted, addressing the efficiency of structural design for shear walls through both experimental and analytical research components. These two components will be carried out concurrently since the results from the experimental work will influence and augment the analytical work and vice versa. The experimental work will be used to explore various influencing factors in shear wall behaviour using already established quasi-static and dynamic test capabilities. The experimental component will also incorporate the use of a new visual measurement system adapted from the Particle Image Velocimetry (PIV) technique. The advantage of using such novel systems in comparison to traditional instruments (e.g. displacement transducers, strain gauges) is the ability to observe movements and strains in an entire area of interest, rather than at a limited number of specific locations where the instruments are attached. Non-contact systems are also crucial for dynamic testing where traditional measurement instruments can be easily damaged. Strengthening of unreinforced concrete block masonry walls using both steel fibre reinforced grout and polyurethane foams as core-fill will also be studied experimentally. Numerical modelling of the experimental results will also be carried out using finite element analysis. The focus of the analytical work is to develop new equations that more effectively capture masonry shear wall behaviour by applying methods from reinforced concrete, such as modified compression field theory (MCFT) and shear friction, to unreinforced and partially grouted masonry for the first time. Shear design methods based on shear-friction or MCFT for reinforced masonry are attractive because, in contrast to traditional, empirically derived models, the approach is based on comprehensive, rational theory that should be more widely applicable. Various existing equations for predicting in-plane shear strength of masonry will be evaluated along with the new equations for their reliability and level of safety by employing stochastic and probabilistic methods. Overall, this ground-breaking research, which combines innovative measurement systems in the experimental work with a novel approach in the analysis, will contribute significantly to the fundamental understanding of the behaviour of masonry shear walls leading to improvement in design standards in Canada and elsewhere, impacting researchers, designers, contractors, and infrastructure owners, including governments.

剪力墙是结构砌体和其他类型建筑物的基本结构构件，可抵抗风或地震引起的侧向荷载。在重大地震事件中，剪力墙负责保持结构完整性，防止建筑物完全倒塌，即使其他墙壁或非结构部件倒塌。因此，这些结构构件的有效和安全设计是非常重要的。建议的研究计划的总体目标是提供改进的指导砌体剪力墙的设计和加强，通过开发一个改进的模型，适用于各种砌体形式的面内剪切。建议的研究是多方面的，通过实验和分析研究组件解决剪力墙结构设计的效率。这两个部分将同时进行，因为实验工作的结果将影响和加强分析工作，反之亦然。实验工作将用于探索各种影响因素，在剪力墙的行为，使用已经建立的准静态和动态测试能力。实验部分还将包括使用一种新的视觉测量系统，该系统是根据粒子图像测速技术（PIV）改装的。与传统仪器（例如位移传感器、应变仪）相比，使用这种新型系统的优点是能够观察整个感兴趣区域中的运动和应变，而不是在仪器所附接的有限数量的特定位置处。非接触式系统对于传统测量仪器容易损坏的动态测试也至关重要。此外，还将对采用钢纤维增强灌浆和聚氨酯泡沫作为芯材的无筋混凝土砌块砌体墙的加固进行试验研究。还将使用有限元分析对实验结果进行数值模拟。分析工作的重点是开发新的方程，更有效地捕捉砌体剪力墙的行为，从钢筋混凝土的应用方法，如修改后的压缩场理论（MCFT）和剪切摩擦，无筋和部分灌浆砌体的第一次。基于剪切摩擦或MCFT的配筋砌体的抗剪设计方法是有吸引力的，因为与传统的经验推导模型相比，该方法是基于全面的，合理的理论，应该是更广泛适用的。现有的各种公式预测砌体的面内抗剪强度将评估沿着与新的方程，其可靠性和安全水平，采用随机和概率的方法。总的来说，这项突破性的研究将实验工作中的创新测量系统与分析中的新方法相结合，将大大有助于对砌体剪力墙行为的基本理解，从而改善加拿大和其他地方的设计标准，影响研究人员，设计师，承包商和基础设施业主，包括政府。