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为了研究长期温湿度变化环境对木构件持续荷载效应的影响,将温湿度的长期变化视为木构件的外部荷载,在已有强度损伤累积模型基础上,采用miner线性损伤累积理论,通过数值分析方法建立了同时考虑日温湿度变化和年温湿度变化的长期荷载作用下木构件的强度损伤累积模型,并积分得到了材料强度衰减模型.结果表明:以年为时间单位的长期强度损伤累积模型保留了Gerhards模型的指数形式,大大提高了计算效率;材料强度衰减模型反映长期荷载作用下木构件强度的时变规律,便于采用抗力理论对历史建筑木结构进行剩余寿命预测;应用本文建立的模型对某历史建筑木桁架进行的剩余寿命预测验证了该模型的可行性和合理性.
In order to study the effect of long-term temperature and humidity environment on the continuous load effect of wood components, the long-term changes of temperature and humidity are regarded as the external loads of wood components. Based on the accumulated damage damage model, miner linear damage accumulation theory is adopted and numerical analysis Methods The cumulative damage strength model of wood components under long-term load with the change of daily temperature and humidity and the annual temperature and humidity was established, and the material strength attenuation model was established by integration.The results showed that the long-term strength damage cumulative model Which preserves the exponential form of Gerhards model and greatly improves the computational efficiency. The material strength decay model reflects the time-varying law of the strength of wood components under long-term loading, which makes it easy to predict the remaining life of the historic wood structure using the resistance theory. By using the model The prediction of the remaining life of a historic wooden truss validates the feasibility and rationality of the model.