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Grouping response method for equivalent static wind loads based on a modified LRC method

Earthquake Engineering and Engineering Vibration 2012年第1期11卷 107-119页

作者： Zhou Xuanyi Gu Ming Li Gang State Key Laboratory of Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

wind loading is one of the most important loads for controlling the design of large-span roof structures. equivalent static wind loads, which can generally aim at determining a specific response, are widely used by structural designers. A method for equivalent static wind loads applicable to multi-responses is proposed in this paper. A modified load- response-correlation （LRC） method corresponding to a particular peak response is presented, and the similarity algorithm implemented for the group response is described. The main idea of the algorithm is that two responses can be put into one group if the value of one response is close to that of the other response, when the structure is subjected to equivalent static wind loads aiming at the other response. Based on the modified LRC, the grouping response method is put forward to construct equivalent static wind loading. This technique can simultaneously reproduce peak responses for some grouped responses. To verify its computational accuracy, the method is applied to an actual large-span roof structure. Calculation results show that when the similarity of responses in the same group is high, equivalent static wind loads with high accuracy and reasonable magnitude of equivalent static wind distribution can be achieved.

关键词： large-span roof equivalent static wind loads modified LRC method grouping response similarityalgorithm

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A new framework for evaluating along-wind responses of a transmission tower

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Earthquake Engineering and Engineering Vibration 2009年第1期8卷 87-93页

作者： Liu Guohuan and Li Hongnan School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116023, China PhD Professor School of Civil and Hydraulic Engineering Dalian University of Technology Dalian 116023 China

In this paper, an analytical framework to evaluate the along-wind-induced dynamic responses of a transmission tower is presented. Two analytical models and a new method are developed：（1） a higher mode generalized force spectrum （GFS） model of the transmission tower is deduced; （2） an analytical model that includes the contributions of the higher modes is further derived as a rational algebraic formula to estimate the structural displacement response; and （3） a new approach, applying load with displacement （ALD） instead of force, to solve the internal force of transmission tower is given. Unlike conventional methods, the ALD method can avoid calculating equivalent static wind loads （ESWLs）. Finally, a transmission tower structure is used as a numerical example to verify the feasibility and accuracy of the ALD method.

关键词： along-wind-induced dynamic responses transmission tower generalized force spectrum equivalent static wind loads

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