Existing Masonry Infill Building Test Program

该项目建议立即利用一个独特的机会，获得有价值的全尺寸测试数据，测试洛杉矶市现有多层建筑框架的砌体填充墙的抗震性能。位于洛杉矶市中心的四座建于1913年至1917年之间的老旧建筑计划于12月底拆除。该组建筑包括：一栋12层建筑、两座4层建筑和一栋7层建筑，均采用砌体填充墙。这些建筑类型代表了数百个，如果不是数千个，在美国地震带存在的类似建筑物中，私家侦探已经得到了建筑物所有者和当地官员的许可，在拆除这些建筑物之前使用测试程序对其进行测试建筑构件和组件将提供有关其地震载荷/变形特性的宝贵信息。洛杉矶市作为主要协调人参与了这个项目，并贡献了捐赠的时间供其一名官员参与。由于这些建筑物将于12月底拆除，所以要获得这些易逝的数据，时间是至关重要的。研究计划包括一个测试程序，包括：1。填充墙的面外试验。2. 填充墙和材料性能的平面试验。3. 混凝土和钢框架结构细节。4. 混凝土包覆钢框架梁/柱连接。5. 全尺寸建筑谐波振动筛振动。本研究的一个主要目的是记录钢筋、钢类型/丝锥等，以及钢框架中的连接类型。此外，将测量材料强度，以便为相同年龄的类似现有建筑类别和建筑类型的性能制定具体数字。另一个主要目标是使用洛杉矶地区结构工程师目前使用的无损检测仪器来确定钢筋的位置。该项目预计将为地震工程研究的进步提供有价值的结果，以调查旧的，现有的建筑问题。

This project proposes to take immediate advantage of a unique opportunity to obtain valuable full-scale test data on the seismic performance of existing multi-story building frames with masonry infill walls in the City of Los Angeles. Four older, existing buildings constructed between 1913 and 1917 are scheduled for demolition in downtown Los Angeles in late December. This group of buildings consists of: one 12-story building, two 4-story buildings, and one 7-story building, all with infill masonry infill walls. These building types are representative of the many hundreds, if not thousands, of similar buildings that exist in seismic regions in the U.S. The P.I. has been given permission by the building owners and local officials to test these buildings before they are demolished by using testing procedures on the building components and subassemblies that will provide invaluable information on their seismic load/deformation characteristics. The City of Los Angeles is involved as a major coordinator in this project and is contributing donated time for participation by one of its officials. As the buildings will be demolished by late December, time is of the essence in obtaining this perishable data. The research plan encompasses a testing program that includes: 1. Out of plane testing of infill walls. 2. In plane testing of infill walls and material properties. 3. Concrete and steel frame construction details. 4. Concrete encased steel frame beam/colum connections. 5. Full scale building harmonic shaker vibration. One major objective of this research is to document the steel rebar steel types/taps, etc., and the types of connections in the steel frames. In addition, material strengths will be measured in order to develop specific numbers for the performance of similar existing building classes and construction types of the same age. Another major objective will be placed on the use of nondestructive testing instruments that is in current application by structural engineers in the Los Angeles region to determine the location of rebars. This project is expected to produce valuable results for the advancement of earthquake engineering research in the investigation of the older, existing building problem.