Single layer two-way grid shell with in-plane and out-of-plane tension members is a new type of single-layer latticed shell roofs. Compared with traditional single-layer latticed shells,this new type has a unique mesh...Single layer two-way grid shell with in-plane and out-of-plane tension members is a new type of single-layer latticed shell roofs. Compared with traditional single-layer latticed shells,this new type has a unique mesh form and excellent rigidity. In order to further understand the buckling behaviors of single layer two-way grid cylindrical shell roof with tension members,the buckling experiments have been undertaken to investigate the effect of tension members,in either out-of-plane or in-plane placement. A single layer two-way grid cylindrical shell roof with out-of-plane tension members has been tested under symmetric and asymmetric loading. The tension member placement,the introducing initial axial force to tension members and the load patterns are considered to investigate the buckling behavior. Experimental results indicate that four long out-ofplane tension members work well under symmetrical loading,but only two long out-of-plane tension members work under asymmetrical loading. It can be concluded that the PC bar members used as tension members for this study are useful in the construction of a single layer two-way grid cylindrical shell roof with structural members intersecting at small angles.展开更多
利用铁尾矿进行高炉渣调质实验,研究了酸度系数( M k )对调质高炉熔渣析晶性能、黏度及表面张力的影响.结果表明:随 M k 的增加,调质熔渣的析晶温度明显降低,当 M k 高于1.4时熔渣温度降至 1 100℃,体系仍为无序玻璃相;随 M k 的增大,...利用铁尾矿进行高炉渣调质实验,研究了酸度系数( M k )对调质高炉熔渣析晶性能、黏度及表面张力的影响.结果表明:随 M k 的增加,调质熔渣的析晶温度明显降低,当 M k 高于1.4时熔渣温度降至 1 100℃,体系仍为无序玻璃相;随 M k 的增大,调质熔渣黏度对温度变化的敏感性逐渐减弱,适宜成纤黏度范围对应的温度区间逐渐增大,适宜成纤黏度范围内最低成纤温度与析晶温度之差Δ t =( t w- t l)逐渐增大,当 M k为1.2时Δ t 为101.7 ℃;在调质熔渣适宜成纤温度范围内, M k 对熔渣表面张力的影响不大,熔渣表面张力与黏度的比值σ/η(表征熔渣成形难易程度)随 M k 的增大逐渐减小.展开更多
基金Sponsored by the Postdoctoral Science Foundation of China(Grant No.2015M571422)Heilongjiang Province Postdoctoral Science Foundation(Grant No.LBH-Z14095)"Young Talents"Project of Northeast Agricultural University(Grant No.14QC50)
文摘Single layer two-way grid shell with in-plane and out-of-plane tension members is a new type of single-layer latticed shell roofs. Compared with traditional single-layer latticed shells,this new type has a unique mesh form and excellent rigidity. In order to further understand the buckling behaviors of single layer two-way grid cylindrical shell roof with tension members,the buckling experiments have been undertaken to investigate the effect of tension members,in either out-of-plane or in-plane placement. A single layer two-way grid cylindrical shell roof with out-of-plane tension members has been tested under symmetric and asymmetric loading. The tension member placement,the introducing initial axial force to tension members and the load patterns are considered to investigate the buckling behavior. Experimental results indicate that four long out-ofplane tension members work well under symmetrical loading,but only two long out-of-plane tension members work under asymmetrical loading. It can be concluded that the PC bar members used as tension members for this study are useful in the construction of a single layer two-way grid cylindrical shell roof with structural members intersecting at small angles.
文摘利用铁尾矿进行高炉渣调质实验,研究了酸度系数( M k )对调质高炉熔渣析晶性能、黏度及表面张力的影响.结果表明:随 M k 的增加,调质熔渣的析晶温度明显降低,当 M k 高于1.4时熔渣温度降至 1 100℃,体系仍为无序玻璃相;随 M k 的增大,调质熔渣黏度对温度变化的敏感性逐渐减弱,适宜成纤黏度范围对应的温度区间逐渐增大,适宜成纤黏度范围内最低成纤温度与析晶温度之差Δ t =( t w- t l)逐渐增大,当 M k为1.2时Δ t 为101.7 ℃;在调质熔渣适宜成纤温度范围内, M k 对熔渣表面张力的影响不大,熔渣表面张力与黏度的比值σ/η(表征熔渣成形难易程度)随 M k 的增大逐渐减小.
