Characterization of seismic performance of concrete block arch and dome structures

不列颠哥伦比亚省温哥华的锁块有限公司生产预制混凝土产品。该公司创造了一套预制砌块拱顶结构体系。建议的研究计划的目的是适当地描述这些系统在水平和垂直地震震动作用下的地震行为，并根据需要制定外部加固和/或耗能机制的工程设计指南。计划中的方法利用了比例模型的振动台测试和分析模型。分析模型使用固定的铰点，并采用刚体几何形式，即所谓的“四连杆”机构。从以往的振动台试验中观察到，拱体以摇摆型破坏和四连杆机构为主，容易受到脉冲型地面激励的影响。 对于拟议的项目，将使用1/25比例模型上的按时间尺度的地震地面运动进行振动台试验。考虑到当地的设计(如西海岸和NBCC)以及来自世界各地的重大地震，将应用一套地面运动。这些记录将在不同的烈度水平上应用，以确定对地面运动类型和应用它的模型的敏感性。 对于分析模型，将分析四连杆模型和附加实体模型。这些模型将被用来检验基于振动台测试的更大范围的行为。测试变量将包括各种外部加固方法和不同的边界条件(如第一排块)。为了验证小规模分析模型的有效性，将进行全尺寸静态试验。 这个项目的成果将包括一份完整的实验测试报告，一篇专注于分析测试的硕士论文，两篇会议论文和一篇期刊论文，以及一份工程设计指南。

Lock Block Ltd., of Vancouver, BC, manufactures pre-cast concrete products. The company has created a system of pre-cast block arch and dome structures. The objective of the proposed research program is to properly characterize the seismic behaviour of these systems, when subjected to both horizontal and vertical seismic shaking and to develop an engineering guideline for design of an external reinforcing and/or energy dissipating mechanism as required. The intended approach utilizes shake-table testing of scale models, and analytical modelling. The analytical model uses fixed hinge points and assumes rigid-body geometry with what is referred to as the 'four-link' mechanism. It has been observed from shake table testing in the past, that the rocking-type failure and four-link mechanism governs, and that the arches are vulnerable to impulse-type ground excitations. For the proposed project, shake table tests will be performed using time-scaled earthquake ground motions on 1/25 scale models. A suite of ground motions will be applied taking into consideration local design (such as west coast and NBCC) and also significant earthquakes from around the world. These records will be applied at different intensity levels, to determine sensitivities to the type of ground motion and model it is applied to. For the analytical modelling the four-link model and additional solid-modelling will be analyzed. These models will be used to examine a wider range of behaviour, based on the shake table tests. Test variants will include various external reinforcing methods and varying boundary conditions (such as the first row of blocks). To validate the small-scale and analytical modelling, a full-scale static test will be performed. The deliverables of this project will include a complete experimental test report, a Master's thesis which will focus on the analytical testing, two conference papers and one journal paper, and an Engineering Design Guideline.