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  • ISSN 1001-5299    CN 11-1874/S   邮发代号:2-141
  • 主办:国家林业局林产工业规划设计院 中国林产工业协会
林产工业
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加拿大铁杉正交胶合木弯曲性能预测与评估
为了对正交胶合木(CLT)的弯曲性能开展有效预测与评估,验证CLT板件弯曲性能预测值的可靠性,采用自由梁#br# 横向振动法,对加拿大铁杉锯材顺纹弹性模量进行动态测试与质量分等;采用悬臂板横向振动法动态测试铁杉锯材的横#br# 纹剪切模量和弹性模量;将分等后的铁杉锯材制成足尺CLT楼板、墙板用板材,并采用四点弯曲法静态测试CLT板材的弹#br# 性模量值;然后将锯材顺纹弹性模量、横纹剪切模量和弹性模量实测值代入模型公式进行CLT板弯曲性能预测,并与CLT#br# 板材静态弹性模量实测值作比较分析。结果表明: CLT主强度方向弹性模量预测值为11 222 MPa,实测值为11 312 MPa,#br# CLT板材的弯曲弹性模量的预测值与其实测值决定系数为0.887,具有较强的相关性;用CLT板材的预测值模型公式评估#br# 其弯曲性能指标,具有应用上的可行性和可靠性;铁杉制成的CLT板材弯曲性能达到CLT楼板、墙板等工程用的等级要求。
1.College of Material Science and Engineering, Nanjing Forestry University, Nanjing 210037, China
2.Ningbo Sino-Canada Low- Carbon New Technology Research Institute,Ningbo 315600, China
Prediction and Assessment of Canadian Hemlock CLT Bending Performance
In order to effectively predict and assess the bending performance of CLT , and to reliability#br# prediction verification of CLT plate bending, dynamic testing and grading are made into full scale CLT slabs and#br# wall panels according to elastic modulus parallel to grain, by the transverse vibration free beam method used in#br# this paper; the transverse shear modulus and elastic modulus of the fir lumber are tested by the dynamic test of#br# the transverse vibration of the cantilever plate and the four-point bending method; the elastic modulus parallel to#br# grain , the transverse shear modulus and the elastic modulus of the lumber are substituted into the model formula#br# of the CLT plate, and the flexural properties are predicted and compared with the measured values of the CLT#br# plate. The predictive value of the flexural modulus of the CLT sheet is 0.887. The results show that the prediction#br# of the bending elastic modulus of CLT sheet value and measured value strong correlation, prediction of elastic#br# modulus is 11 222 MPa, and the measured value is 11 312 MPa; the bending model formula to assess the#br# performance indicators for the prediction of CLT sheet value, has the feasibility and reliability of application; The#br# bending performance of CLT plate is up to CLT floor,wallboard and other engineering requirements.
1.南京林业大学材料科学与工程学院
2.宁波中新加拿大低碳新技术研究所