To improve the seismic performance of columns, engineered cementitious composite （ECC） is introduced to partially substitute concrete at the base of the columns to form ECC,/reinforced concrete （ RC） composite col...To improve the seismic performance of columns, engineered cementitious composite （ECC） is introduced to partially substitute concrete at the base of the columns to form ECC,/reinforced concrete （ RC） composite columns. The mechanical behaviors of the ECC/RC composite columns are numerically studied under low-cyclic loading with the finite element analysis softwareof MSC. MARC. It is found that the ECC/RC composite columns can significantly enhance the load capacity, the ductility ad energy dissipation of columns. Then, the effects of the height of the ECC, the axial compression ratio and the longitudinal reinforcement ratio on the seismic behaviors of the composite columns are parametrically studied. The results show that the ECC/RC composite column with a height of the ECC layer of 0. Sh（h is the height to the cross-section） can achieve similar seismic performance of a full ECC column. The peak load of the composite column increases significantly while the ductility decreases with the increase of the axial compression ratio. Increasing the longitudinal reinforcement ratio within a certain range can improve the ductility and energy dissipation capacity and almost has no effect on load capacity. The aalysis results ae instructive and valuable for reference in designing ECC structures.展开更多
Objective To observe the therapeutic effect of moxibustion on primary dysmenorrhea due to damp- cold retention. Methods Eighty cases with primary dysmenorrhea due to damp-cold retention were randomly divided into a mo...Objective To observe the therapeutic effect of moxibustion on primary dysmenorrhea due to damp- cold retention. Methods Eighty cases with primary dysmenorrhea due to damp-cold retention were randomly divided into a moxibustion group （40 cases） and a medication group （40 cases）. Moxibustion at Guonyudn （关元 CV 4） and Shiqizhui （十七椎 EX-B 8） was adopted for treatment of the moxibustion group a week before the period, which lasted for 10 days as a treatment course. Fenbid was used as oral administration for three continue menstrual periods for the medication group. The treatment lasted for 3 menstrual periods in two groups. The Cox Menstrual Symptom Scale （CMSS） was adopted to grade the menstrual symptoms, and differences between the two groups were compared. Results The total effective rate of the moxibustion group was 97.5% （39/40）, and the total effective rate of the medication group was 72.5% （29/40）. The effect of the moxibustion group was obviously better than the medication group （P〈0.05）. Before and after treatment the menstrual symptom scores of the moxibustion group were 9.78±1.86 and 2.25±3.33, while the medication group were 9.71±1.64 and 5.31±4.26. The scores of both groups decreased obviously after treatments. And the decreased amplitude of the moxibustion group was much more obvious than that of the medication group （P〈0.05）. Conclusion The effect of moxibustion on primary dysmenorrhea due to damp-cold retention is obvious, which is better than Fenbid.展开更多
基金The National Natural Science Foundation of China(No.51278118)the Natural Science Foundation of Jiangsu Province(No.BK2012756)+1 种基金the Key Project of Ministry of Education of China(No.113029A)the Third Five-Year Major Scientific and Technological Project of China Metallurgical Group Corporation
文摘To improve the seismic performance of columns, engineered cementitious composite （ECC） is introduced to partially substitute concrete at the base of the columns to form ECC,/reinforced concrete （ RC） composite columns. The mechanical behaviors of the ECC/RC composite columns are numerically studied under low-cyclic loading with the finite element analysis softwareof MSC. MARC. It is found that the ECC/RC composite columns can significantly enhance the load capacity, the ductility ad energy dissipation of columns. Then, the effects of the height of the ECC, the axial compression ratio and the longitudinal reinforcement ratio on the seismic behaviors of the composite columns are parametrically studied. The results show that the ECC/RC composite column with a height of the ECC layer of 0. Sh（h is the height to the cross-section） can achieve similar seismic performance of a full ECC column. The peak load of the composite column increases significantly while the ductility decreases with the increase of the axial compression ratio. Increasing the longitudinal reinforcement ratio within a certain range can improve the ductility and energy dissipation capacity and almost has no effect on load capacity. The aalysis results ae instructive and valuable for reference in designing ECC structures.
文摘Objective To observe the therapeutic effect of moxibustion on primary dysmenorrhea due to damp- cold retention. Methods Eighty cases with primary dysmenorrhea due to damp-cold retention were randomly divided into a moxibustion group （40 cases） and a medication group （40 cases）. Moxibustion at Guonyudn （关元 CV 4） and Shiqizhui （十七椎 EX-B 8） was adopted for treatment of the moxibustion group a week before the period, which lasted for 10 days as a treatment course. Fenbid was used as oral administration for three continue menstrual periods for the medication group. The treatment lasted for 3 menstrual periods in two groups. The Cox Menstrual Symptom Scale （CMSS） was adopted to grade the menstrual symptoms, and differences between the two groups were compared. Results The total effective rate of the moxibustion group was 97.5% （39/40）, and the total effective rate of the medication group was 72.5% （29/40）. The effect of the moxibustion group was obviously better than the medication group （P〈0.05）. Before and after treatment the menstrual symptom scores of the moxibustion group were 9.78±1.86 and 2.25±3.33, while the medication group were 9.71±1.64 and 5.31±4.26. The scores of both groups decreased obviously after treatments. And the decreased amplitude of the moxibustion group was much more obvious than that of the medication group （P〈0.05）. Conclusion The effect of moxibustion on primary dysmenorrhea due to damp-cold retention is obvious, which is better than Fenbid.
