The earthquake mitigation effect of hysteretic dampers is not only related to the number, stiffness, strength, deformation ability of dampers but also to the strength and stiffness of the structure. This paper studied...The earthquake mitigation effect of hysteretic dampers is not only related to the number, stiffness, strength, deformation ability of dampers but also to the strength and stiffness of the structure. This paper studied the condition that structures should be in when the hysteretic dampers mitigated seismic action most effectively and made appropriate numerical analysis to verify the effectiveness of theory derivation. The inelastic seismic responses were analyzed for the SDOF system that the shear strength ratio of the damper system was taken differently and the result showed that when the ratio was in the vicinity of the optimum strength ratio of the damper system, the displacement of the structure was minimum and the energy dissipation of dampers was maximum, which indicated that the dampers mitigated seismic action most effectively. The result also indicated that the hysteretic dampers had significant earthquake mitigation effect when the strength ratio β changed in a relatively wide range.展开更多
This study is carried out to appreciate the coarse elements influence of the gravel lateritic soils on the pavement behavior. The material involves not only the 0/20 mm granular particles considered in the specificati...This study is carried out to appreciate the coarse elements influence of the gravel lateritic soils on the pavement behavior. The material involves not only the 0/20 mm granular particles considered in the specifications and on the laboratory tests, but also all of the material that is actually used in the construction sites. Geotechnical characterization was leaned on five differentiated granular classes of 0/20;0/25;0/31.5;0/40 and 0/63 mm diameters. The sample of 0/40 mm gets the best compaction aptitude, while that of 0/31.5 mm reaches the greatest bearing strength and a good Optimum Moisture Content. According to the requirements and its bearing strengths, the material is usable up to subbase layer and its behavior depends on the grain size.展开更多
以钢渣作为细骨料,采用不同粒径、取代量的钢渣制备钢渣泡沫混凝土(SSFC)。根据自然养护7 d SSFC的无侧限抗压强度,得出制备SSFC的最优配比;基于正交试验分析钢渣粒径、钢渣取代量、水胶比三因素对SSFC抗压强度的影响程度;在此基础上,...以钢渣作为细骨料,采用不同粒径、取代量的钢渣制备钢渣泡沫混凝土(SSFC)。根据自然养护7 d SSFC的无侧限抗压强度,得出制备SSFC的最优配比;基于正交试验分析钢渣粒径、钢渣取代量、水胶比三因素对SSFC抗压强度的影响程度;在此基础上,探讨钢渣取代量对SSFC导热性、抗折强度、吸水率等力学性能的影响,分析不同钢渣取代量下SSFC的微观结构。结果表明:制备SSFC的最优配比为钢渣粒径1.18 mm、钢渣取代量(质量分数,下同)20%、水胶比0.45;三因素对SSFC抗压强度的影响程度为钢渣取代量>钢渣粒径>水胶比;随钢渣取代量的增加,SSFC的导热性和吸水率逐渐减小、抗折强度先增后减,钢渣取代量为20%时SSFC抗折强度最大,这是因为20%钢渣取代量下的SSFC平均孔径最小、孔隙分布最均匀。展开更多
基金Sponsored by China Postdoctoral Science Foundation(Grant No2005037186) Heilongjiang Postdoctoral Science Foundation(Grant No2005LBH-Z05035)
文摘The earthquake mitigation effect of hysteretic dampers is not only related to the number, stiffness, strength, deformation ability of dampers but also to the strength and stiffness of the structure. This paper studied the condition that structures should be in when the hysteretic dampers mitigated seismic action most effectively and made appropriate numerical analysis to verify the effectiveness of theory derivation. The inelastic seismic responses were analyzed for the SDOF system that the shear strength ratio of the damper system was taken differently and the result showed that when the ratio was in the vicinity of the optimum strength ratio of the damper system, the displacement of the structure was minimum and the energy dissipation of dampers was maximum, which indicated that the dampers mitigated seismic action most effectively. The result also indicated that the hysteretic dampers had significant earthquake mitigation effect when the strength ratio β changed in a relatively wide range.
文摘This study is carried out to appreciate the coarse elements influence of the gravel lateritic soils on the pavement behavior. The material involves not only the 0/20 mm granular particles considered in the specifications and on the laboratory tests, but also all of the material that is actually used in the construction sites. Geotechnical characterization was leaned on five differentiated granular classes of 0/20;0/25;0/31.5;0/40 and 0/63 mm diameters. The sample of 0/40 mm gets the best compaction aptitude, while that of 0/31.5 mm reaches the greatest bearing strength and a good Optimum Moisture Content. According to the requirements and its bearing strengths, the material is usable up to subbase layer and its behavior depends on the grain size.
文摘以钢渣作为细骨料,采用不同粒径、取代量的钢渣制备钢渣泡沫混凝土(SSFC)。根据自然养护7 d SSFC的无侧限抗压强度,得出制备SSFC的最优配比;基于正交试验分析钢渣粒径、钢渣取代量、水胶比三因素对SSFC抗压强度的影响程度;在此基础上,探讨钢渣取代量对SSFC导热性、抗折强度、吸水率等力学性能的影响,分析不同钢渣取代量下SSFC的微观结构。结果表明:制备SSFC的最优配比为钢渣粒径1.18 mm、钢渣取代量(质量分数,下同)20%、水胶比0.45;三因素对SSFC抗压强度的影响程度为钢渣取代量>钢渣粒径>水胶比;随钢渣取代量的增加,SSFC的导热性和吸水率逐渐减小、抗折强度先增后减,钢渣取代量为20%时SSFC抗折强度最大,这是因为20%钢渣取代量下的SSFC平均孔径最小、孔隙分布最均匀。
