强台风荷载作用下输电塔线体系损伤和倒塌机理研究

The safety of the transmission tower-line system under strong typhoon is one of the hot topics of multi-directions and multi-subjects. The proposal aims to examine the ‘typhoon-tower-line’coupled system based on the former research and investigate damage and collapse mechanics of transmission tower-line system under typhoon based on the theoretical deduction, model testing and field measurement. The evolution spectrum is used to establish the wind fields of transmission tower-line system with the mesured data. The model updating algorithm of the transmission tower-line system is proposed and the fine analytical model is constructed and verified by considering the damage effects. The micro mechanical mechanism and evolution mechanism of tower damage during the entire collapse is investigated in detail. In addition, the proposal may study the coupling mechanics of tower-line system and the dynamic boundary condition of transmission lines. Finally, to establish the fine anlaytical approach for the typhoon-indcued tower collapse and to define the disaster evolution stage and evaluation index. The experiment and field measurement are carried out to verify the validity and relability of proposed methods and made observations. It is expected that the research may promote the understanding on the ‘typhoon-tower-line’coupled system and provide beneficial suggestion on the disaster prevention and reduction of transmission tower-line system, which has important theoretical and engineering values.

输电塔线体系在强台风作用下的安全性是多方向、多学科的交叉热点研究问题。本申请在前期研究基础上，围绕”强台风-塔-线”系统的科学问题，结合理论推导、模型试验和现场实测，研究输电塔线体系的风致损伤和倒塌机理。基于实测数据，采用演变谱方法建立针对输电塔线体系的强台风荷载模型。提出输电塔线体系的模型修正方法，建立考虑损伤效应的输电塔线体系精细分析模型，并验证其正确性和可靠性。研究强台风作用下输电塔线体系倒塌全过程的损伤形成细观力学机理、从构件向宏观结构的演化机制。研究倒塔全过程中的塔-线动力耦合机理和导线动力边界条件。建立强台风倒塔全过程精细化分析方法，掌握倒塔全过程的机理，划分其倒塌灾变的演变阶段和灾变评价指标。通过实验实测验证相关方法和结论的有效应和可靠性。通过本项目研究能促进”强台风-塔-线”系统的认识，为输电线路防灾减灾提供参考依据，具有重要的理论价值和工程应用价值。

输电塔线体系在强台风作用下的安全性是多方向、多学科的交叉热点研究问题。本项申请在前期研究基础上，围绕其中的科学问题，结合理论推导、模型试验和现场实测，从输电塔线体系台风荷载模型出发，系统研究强台风荷载作用下输电塔线体系损伤和倒塌机理问题。本研究的工作主要包括几个方面：输电塔线体系强风荷载模型和输电塔线体系强风作用下的破话机理。主要研究成果包括：(1) 基于演变谱方法建立了输电塔线体系的强台风荷载模型；（2）提出了输电塔线体系的模型修正方法，建立考虑损伤效应的输电塔线体系精细分析模型；（3）研究掌握了强台风作用下输电塔线体系倒塌全过程的破坏机理、从构件向宏观结构的演化机制；（4）通过大量实验实测研究验证了倒塔全过程中的塔-线动力耦合特性和倒塔全过程的机理。建立强台风荷载作用下输电塔线体系损伤和倒塌分析和评定方法是一种全新的结构防灾减灾手段，国内外研究还不完善，因此具有重要的理论价值和工程应用价值。研究成果具有广泛的应用前景。通过项目研究完成了30多篇学术论文，其中包括多篇SCI国际期刊论文。在多个学术会议做邀请报告，相关成果在典型输电塔线体系上得到了实际应用。