土建畢業(yè)設(shè)計(jì)外文翻譯---一個(gè)未完工的二層預(yù)制混凝土結(jié)構(gòu)物的抗震測(cè)試-建筑結(jié)構(gòu)(完整版)
【正文】 igated. The structure was tested up to failure in a laboratory under simulated seismic loading. In some of the beamtocolumn joints, the bottom longitudinal bars of the beam were purposely undeveloped due to dimensional constraints. Emphasis is given in the study on the evaluation of the observed global behavior of the test structure. This behavior showed that the walls of the test structure controlled the force path mechanism and significantly reduced the lateral deformation demands in the precast frames. Seismic design criteria and code implications for precast concrete structures resulting from this research are discussed. The end result of this research is that a better understanding of the structural behavior of this type of building has been gained results of simulated seismic load tests of a two story precast concrete building constructed with precast concrete elements that are used in Mexico are described herein. The structural system chosen in the test structure is the so called dual type, defined as the bination of structural walls and beamtocolumn frames. Connections between precast beams and columns in the test structure are of the window type. This type of construction is typically used in low and medium rise buildings in which columns are connected with windows at each story level. These windows contain the top and bottom reinforcement. Fig. 1 shows this type of construction for a mercial building in Mexico City. In most precast concrete frames such as those shown in Fig, 1, longitudinal beam bottom bars are not fully developed due to constraints imposed by the dimensions of file columns in beamtocolumn joints. In an effort to overe this deficiency, and as described later, some practicing engineers in Mexico design these joints by providing hoops around the hooks of that reinforcement in order to achieve its required continuity. However, this practice is not covered in the ACI Building Code (ACI31802), nor in the Mexico City Building Code (MCBC, 1993). Part of this research was done to address this issue. The objectives of this research were Io evaluate the observed behavior of a precast concrete structures in the laboratory and to propose the use of precast structural elements or precast structures with both an acceptable level of expected seismic performance and appealing features from the viewpoint of construction Emphasis is given in this paper on the global behavior of the test structure. In the second part of this research which gill be presented in a panion paper, the observed behavior of connections between precast elements in the test structure, as well as the behavior of the precast floor system will be discussed in detail. Structural and non structural damages observed in buildings during past earthquakes throughout the world have shown the importance of controlling lateral displacement in structures to reduce building damage during earth quakes. It is also relevant to mention that there are several cases of structures in moderate earthquakes in which the observed damage in nonstructural element
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