SPF规格材蠕变特性研究
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摘要
以轻型木结构建筑常用的SPF规格材为研究对象,采用简支梁中部集中加载的方式进行短期弯曲蠕变试验。结果表明:在不同试验条件下蠕变经过瞬态蠕变阶段、相对稳定蠕变阶段。试件在不同持续负载水平下的蠕变应变-时间曲线具有几何相似性,其曲线的形状和走向趋势大致相同。蠕变变形量和曲线上的跳跃点随着应力水平的增加有增大的趋势。相比于侧弯受力,平弯蠕变速率更大,承载强度损耗较大。
Taking the light wood frame construction commonly used SPF dimension lumber(pine)as the study object, authors of this paper carried out the short-term bending creep experiments. The creep test adopted the method of centralized loading in the middle of simply supported beam. The results showed that the creep deformation under different test conditions goes throuht transient creep stage and relatively stable creep stage.The creep strain-time curves of the specimens under different sustained loads are geometrically similar. The creep deformation and jump point on the curve tend to increase with the increase of stress level. Compared with side bending, the creep rate of flat bending is higher and the bearing strength loss is larger.
Taking the light wood frame construction commonly used SPF dimension lumber(pine)as the study object, authors of this paper carried out the short-term bending creep experiments. The creep test adopted the method of centralized loading in the middle of simply supported beam. The results showed that the creep deformation under different test conditions goes throuht transient creep stage and relatively stable creep stage.The creep strain-time curves of the specimens under different sustained loads are geometrically similar. The creep deformation and jump point on the curve tend to increase with the increase of stress level. Compared with side bending, the creep rate of flat bending is higher and the bearing strength loss is larger.
引文
[1]贾娜,金维洙.单板层积梁弯曲破坏的试验研究与分析[J].中国安全科学学报, 2006, 16(8):135-138.
[2]金维洙,贾娜.单板层积材弯曲蠕变的试验研究[J].东北林业大学报, 2007, 35(10):30-32.
[3]GB/T17657—2013人造板及饰面人造板理化性能试验方法[S].北京:中国标准出版社, 2013.
[4]GB/T 50329—2012木结构试验方法标准[S].北京:中国标准出版社, 2012.
[5]LY/T 1975—2011木材和工程复合木材的持续负载和蠕变影响评定[S].北京:中国标准出版社,2011.
[6]王军煌.应力和含水率作用下杉木的蠕变性能研究[D].南京:南京林业大学, 2009.
[7]卢宝贤,李静辉.几种主要树种的蠕变特性[J].力学与实践, 1996,18(1):36-38.
[8]卢宝贤,李静辉,张斌.几个主要树种的蠕变特性[J].力学与实践,1989, 11(2):41-44.
[9]牟彬杉,郝笑龙,王清文,等.多种木质原料化学成分对比[J].林产工业, 2018, 45(8):28-32.
[10]孙珂,漆楚生,汪莉君,等.杉木纤维素的热稳定性及热分解动力学参数[J].林产工业, 2018, 45(4):38-42.
[11]李文玲,徐伟,周晓燕,等.基于ABAQUS的层积异型座椅受力分析[J].家具, 2018, 39(4):5-9.
[2]金维洙,贾娜.单板层积材弯曲蠕变的试验研究[J].东北林业大学报, 2007, 35(10):30-32.
[3]GB/T17657—2013人造板及饰面人造板理化性能试验方法[S].北京:中国标准出版社, 2013.
[4]GB/T 50329—2012木结构试验方法标准[S].北京:中国标准出版社, 2012.
[5]LY/T 1975—2011木材和工程复合木材的持续负载和蠕变影响评定[S].北京:中国标准出版社,2011.
[6]王军煌.应力和含水率作用下杉木的蠕变性能研究[D].南京:南京林业大学, 2009.
[7]卢宝贤,李静辉.几种主要树种的蠕变特性[J].力学与实践, 1996,18(1):36-38.
[8]卢宝贤,李静辉,张斌.几个主要树种的蠕变特性[J].力学与实践,1989, 11(2):41-44.
[9]牟彬杉,郝笑龙,王清文,等.多种木质原料化学成分对比[J].林产工业, 2018, 45(8):28-32.
[10]孙珂,漆楚生,汪莉君,等.杉木纤维素的热稳定性及热分解动力学参数[J].林产工业, 2018, 45(4):38-42.
[11]李文玲,徐伟,周晓燕,等.基于ABAQUS的层积异型座椅受力分析[J].家具, 2018, 39(4):5-9.