Reliability-based calibration of load duration factors for timber structures
Reliability-based calibration of load duration factors for timber structures
复制标题
DOI：
10.1016/j.strusafe.2004.10.001
复制
发表时间：
2005-04
影响因子：
5.8
通讯作者：
J. Sørensen;S. Svensson;B. D. Stang
中科院分区：
文献类型：
--
作者：
J. Sørensen;S. Svensson;B. D. Stang
木结构的承载能力随着时间的推移而下降，这取决于荷载和木材的类型。基于木结构的典型极限状态和随机模型，采用概率方法标定荷载持续系数。根据丹麦结构规范中的荷载模型，在模拟风、雪和施加荷载的基础上估计荷载持续时间效应。考虑了三种损伤累积模型，即Gerhards模型、Barrett和Foschi模型和Foschi和Yao模型。在这些模型中的参数拟合的最大似然法使用的数据相关的丹麦结构木材和统计不确定性进行量化。使用代表性的短期和长期极限状态的可靠性进行评估，并使用概率模型估计的负载持续时间系数kmodis，从而获得等效的可靠性水平，使用短期和长期的设计方程。使用具有时变强度的简单、有代表性的极限状态和全寿命负载过程的模拟来考虑时变可靠性方面。
The load bearing capacity of timber structures decrease with time depending on the type of load and timber. Based on representative limit states and stochastic models for timber structures, load duration factors are calibrated using probabilistic methods. Load duration effects are estimated on basis of simulation of realizations of wind, snow and imposed loads in accordance with the load models in the Danish structural codes. Three damage accumulation models are considered, namely Gerhards model, Barrett and Foschi’s model and Foschi and Yao’s model. The parameters in these models are fitted by the Maximum Likelihood Method using data relevant for Danish structural timber and the statistical uncertainty is quantified. The reliability is evaluated using representative short- and long-term limit states, and the load duration factor kmodis estimated using the probabilistic model such that equivalent reliability levels are obtained using short- and long-term design equations. Time variant reliability aspect is considered using a simple, representative limit state with time variant strength and simulation of the whole life time load processes.