The estimation of residual displacements in a structure due to an anticipated earthquake event has increasingly become an important component of performance-based earthquake engineering because controlling these displ...The estimation of residual displacements in a structure due to an anticipated earthquake event has increasingly become an important component of performance-based earthquake engineering because controlling these displacements plays an important role in ensuring cost-feasible or cost-effective repairs in a damaged structure after the event.An attempt is made in this study to obtain statistical estimates of constant-ductility residual displacement spectra for bilinear and pinching oscillators with 5%initial damping,directly in terms of easily available seismological,site,and model parameters.None of the available models for the bilinear and pinching oscillators are useful when design spectra for a seismic hazard at a site are not available.The statistical estimates of a residual displacement spectrum are proposed in terms of earthquake magnitude,epicentral distance,site geology parameter,and three model parameters for a given set of ductility demand and a hysteretic energy capacity coefficient in the case of bilinear and pinching models,as well as for a given set of pinching parameters for displacement and strength at the breakpoint in the case of pinching model alone.The proposed scaling model is applicable to horizontal ground motions in the western U.S.for earthquake magnitudes less than 7 or epicentral distances greater than 20 km.展开更多
In this paper, we study the Pinching phenomenon of compact submanifold in Euclidean space, obtain some formulas, and derive Pinching theorem of some geometric quantities.
Objective:To investigate the clinical effect of wrist–ankle acupuncture combined with pinching along the spine on allergic rhinitis(AR)in children.Methods:A total of 65 children with AR were collected from February 2...Objective:To investigate the clinical effect of wrist–ankle acupuncture combined with pinching along the spine on allergic rhinitis(AR)in children.Methods:A total of 65 children with AR were collected from February 2017 through to December 2018 and they were randomly divided into a combined treatment group with wrist–ankle acupuncture,pinching along the spine and western medication(combined treatment group,32 cases)and a western medication group(33 cases).In the western medication group,loratadine was prescribed for oral administration.In the combined treatment group,on the base of the medication as the western medication group,the wrist–ankle acupuncture was adopted in combination with pinching along the spine.Before and after treatment,the symptoms and physical signs were scored and the clinical effect was observed in the children of the two groups.Results:After the treatment and in the follow-up,the scores of the symptoms and physical signs in the combined treatment group were lower than those of the western medication group,indicating a statistical significance(all P<0.05).The total effective rate was 93.7%in the combined treatment group,which was higher than 63.63%in the western medication group,indicating a statistical significance(P<0.05).Conclusion:The combined treatment of wrist–ankle acupuncture combined with pinching along the spine and loratadine effectively relieves the clinical symptoms and the physical signs in AR children.The clinical effect of this combined treatment is better than the simple use of loratadine.展开更多
文摘The estimation of residual displacements in a structure due to an anticipated earthquake event has increasingly become an important component of performance-based earthquake engineering because controlling these displacements plays an important role in ensuring cost-feasible or cost-effective repairs in a damaged structure after the event.An attempt is made in this study to obtain statistical estimates of constant-ductility residual displacement spectra for bilinear and pinching oscillators with 5%initial damping,directly in terms of easily available seismological,site,and model parameters.None of the available models for the bilinear and pinching oscillators are useful when design spectra for a seismic hazard at a site are not available.The statistical estimates of a residual displacement spectrum are proposed in terms of earthquake magnitude,epicentral distance,site geology parameter,and three model parameters for a given set of ductility demand and a hysteretic energy capacity coefficient in the case of bilinear and pinching models,as well as for a given set of pinching parameters for displacement and strength at the breakpoint in the case of pinching model alone.The proposed scaling model is applicable to horizontal ground motions in the western U.S.for earthquake magnitudes less than 7 or epicentral distances greater than 20 km.
基金1 Research supported by NSFC (No.10071021).2 Research supported by NSFC (No.19901010),China Postdoctoral Science Fundation and Fok Ying-Tung Education Fundation.
文摘In this paper, we study the Pinching phenomenon of compact submanifold in Euclidean space, obtain some formulas, and derive Pinching theorem of some geometric quantities.
文摘Objective:To investigate the clinical effect of wrist–ankle acupuncture combined with pinching along the spine on allergic rhinitis(AR)in children.Methods:A total of 65 children with AR were collected from February 2017 through to December 2018 and they were randomly divided into a combined treatment group with wrist–ankle acupuncture,pinching along the spine and western medication(combined treatment group,32 cases)and a western medication group(33 cases).In the western medication group,loratadine was prescribed for oral administration.In the combined treatment group,on the base of the medication as the western medication group,the wrist–ankle acupuncture was adopted in combination with pinching along the spine.Before and after treatment,the symptoms and physical signs were scored and the clinical effect was observed in the children of the two groups.Results:After the treatment and in the follow-up,the scores of the symptoms and physical signs in the combined treatment group were lower than those of the western medication group,indicating a statistical significance(all P<0.05).The total effective rate was 93.7%in the combined treatment group,which was higher than 63.63%in the western medication group,indicating a statistical significance(P<0.05).Conclusion:The combined treatment of wrist–ankle acupuncture combined with pinching along the spine and loratadine effectively relieves the clinical symptoms and the physical signs in AR children.The clinical effect of this combined treatment is better than the simple use of loratadine.
