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风荷载是高聳结构(烟囱、电视塔、输电线塔、桅杆、高聳建筑物等)的主要荷载,所以关于风荷载的性质及其作用下高聳结构的反应的研究是一个有实际意义的问题。目前的研究工作大多偏重于风荷载的静力分析,但突际上风荷载的动力作用是不容忽视的。 本文利用广义座标把结构的振动按振型分解,提出了脉动风压反应的“位移均差譜曲线”的概念,研究了各振型的遇合问题,最后求出了风的动力作用的“折算静荷载”,可以和风荷载的静力部分合并起来进行计算。这样,就把抗风结构的研究工作和计算工作大为简化,而且可以使结构计算简图符合实际情况。
Wind load is the main load of towering structures (chimneys, TV towers, transmission towers, masts, towering buildings, etc.) Therefore, the study of the nature of wind loads and the response of tall structures under their effect is a question of practical significance. Most of the current research work focuses on the static analysis of wind loads, but the dynamic effect of wind loads on the cruciform winds cannot be ignored. In this paper, the vibration of the structure is decomposed by the generalized coordinates in the mode of vibration. The concept of “displacement mean difference spectrum curve” of the pulsating wind pressure reaction is proposed, the problem of meeting each vibration mode is studied, and the dynamic effect of the wind is finally obtained. “Conversion static load” can be calculated by combining with the static part of the wind load. In this way, the research work and calculation work of the wind-resistant structure are greatly simplified, and the structural calculation diagram can be made to conform to the actual situation.