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本文简要介绍一幢原型框架结构动力特性的试验方案、主要测试结果、动力特性的计算方法以及计算结果与实测结果的比较。 试验结构是一幢五开间、二跨、三层装配式钢筋混凝土空框架。实测中采用了四种方法:脉动法、突然卸载法、反冲激振器法和同步起振机法。每层布置三个拾震器,实测了弹性、弹塑性及破坏阶段的平动、扭转振动的频率、阻尼及振型。试验结果表明:几种方法在弹性阶段的测试结果是基本一致的;在结构开裂后各种方法的测试结果有不超过20％的差别。 在试验研究的基础上,本文提出了合理的计算简图和计算方法。
This article briefly introduces the test scheme, the main test results, the calculation method of the dynamic characteristics, and the comparison between the calculated results and the measured results of the dynamic characteristics of a prototype frame structure. The test structure is a five-bay, two-span, three-story reinforced concrete hollow frame. Four methods were used in the actual measurement: pulsation method, sudden unloading method, recoil exciter method and synchronous starter method. Three geophones were placed on each floor. The frequencies of the translational and torsional vibrations, damping and modes of the elastic, elastic-plastic and failure stages were measured. The test results show that the test results of several methods in the elastic phase are basically the same; after the structure cracking, the test results of various methods do not differ by more than 20%. Based on the experimental study, this paper presents a reasonable calculation diagram and calculation method.