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利用爆炸地震波对两幢三层内框架房屋(一幢作了抗震加固)进行了动力响应及结构破坏机理的研究。 以试验结果为依据,确定了多层内框架房屋及其加固房屋的动力计算模型。使用时程法的动力计算程序,输入试验中记录的加速度地震波,对两幢房屋作了弹塑性动力响应至破坏的计算分析。计算结果与试验相符。 讨论了爆炸地震波与天然地震波的频谱特性。通过对其速度波峰值和速度反应谱的分析,确定了两类波的相比条件和地震破坏烈度的标定。 将研究结果用到天然地震波作用下的多层内框架房屋震害机理的分析和动力响应计算中,验证了海城和唐山地震中这类房屋的破坏规律。提出了多层内框架房屋抗震加固设计的原则。
The dynamic response and structural failure mechanism of two three-story framed buildings (an anti-seismic reinforcement in one building) were studied using explosion seismic waves. Based on the experimental results, a dynamic calculation model for a multi-story frame house and its reinforced houses was determined. Using the dynamic calculation procedure of the time-history method, the acceleration seismic waves recorded in the test were input, and the elastoplastic dynamic response to failure of the two houses was calculated and analyzed. The calculated results are in accordance with the test. The spectral characteristics of explosion seismic waves and natural seismic waves are discussed. Through the analysis of its velocity peaks and velocity response spectra, the calibration of the two types of waves compared to the conditions and seismic intensity of the earthquake was determined. The research results are used in the analysis of the earthquake damage mechanism and the dynamic response of the multi-story frame houses under natural seismic waves, and the damage rules of these houses in the Haicheng and Tangshan earthquakes are verified. The principle of aseismic reinforcement design for multi-story framed buildings was proposed.