木结构可靠度分析及木材强度设计值的确定方法

发布时间：2018-02-28 07:28

本文关键词： 木结构木材强度设计值可靠度抗力分项系数变异系数　出处：《建筑结构学报》2017年02期 　论文类型：期刊论文

【摘要】：为使结构用木材的强度设计值符合可靠度要求,建立了适用于现代木结构构件的功能函数,对不同荷载组合下的受弯、受拉和受压木构件进行了可靠度分析。鉴于木材的强度变异系数在较大范围内变动,给出了满足可靠度要求的抗力分项系数与强度变异系数间的关系曲线。以安全可靠与经济合理为原则,选取恒载与住宅楼面活荷载组合且在活荷载与恒载比值为1.0情况下的抗力分项系数与强度变异系数的关系曲线为确定木材强度设计值的基准曲线。当恒载与住宅楼面活荷载或与办公楼面活荷载组合且荷载比值小于1.0时,按基准线确定的强度设计值乘以调整系数0.83+0.17ρ(ρ为活荷载与恒载之比);当恒载与风荷载或与雪荷载组合时,按基准线确定的强度设计值乘以调整系数0.83。对不同安全等级木结构抗力分项系数间的关系进行了讨论,强度变异系数小于0.20的木材方可用于安全等级为一级的木结构,或者适用于木结构设计的结构重要性系数的取值范围宜为0.8~1.2。
[Abstract]:In order to make the strength design value of timber used in structure meet the reliability requirement, a function function suitable for modern wood structure members is established. Reliability analysis of tensile and compressed wood components is carried out. In view of the variation in the strength of wood over a wide range, The relationship curve between the resistance coefficient and the strength coefficient of variation, which meets the reliability requirement, is given. The principle of safety, reliability and economic rationality is taken as the principle of the relationship between the coefficient of resistance and the coefficient of variation of strength. The curve of relationship between resistance coefficient and strength variation coefficient of dead load combined with living load on residential floor and the ratio of live load to dead load is chosen as the benchmark curve to determine the design value of wood strength. When dead load and residence load ratio is 1.0, the relation curve of resistance component coefficient and strength variation coefficient is selected as the benchmark curve for determining the design value of wood strength. When the floor live load or combination with the living load on the office surface is less than 1.0, The strength design value determined by the datum is multiplied by the adjustment coefficient of 0.83 0.17 蟻 (蟻 is the ratio of live load to dead load); when dead load is combined with wind load or snow load, According to the strength design value determined by the datum line multiplied by the adjustment coefficient 0.83.The relationship between the resistance factors of wood structures of different safety grades is discussed. The timber whose strength variation coefficient is less than 0.20 can be used in timber structures with a safety grade of one grade. Or the value range of structural importance coefficient suitable for wood structure design should be 0.8 ~ 1.2.
【作者单位】：哈尔滨工业大学结构工程灾变与控制教育部重点实验室;哈尔滨工业大学土木工程学院;
【基金】：国家自然科学基金项目(51278154)
【分类号】：TU366.2

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