In general, the seismic response analysis in earthquake engineering assumes that the vibration parameters of the target and the contact surface of the external media are identical,i. e., single point input. However, e...In general, the seismic response analysis in earthquake engineering assumes that the vibration parameters of the target and the contact surface of the external media are identical,i. e., single point input. However, earthquake energy has an attenuation phenomenon in wave propagation,so a wide range of soil slopes and the external medium contact surface of different input points on motion are not identical. If we consider single point input only, it may not correspond with reality, so it is necessary to carry out research on multi-point input methods. Based on the 2-D slope model,single-point input and multi-point input are performed respectively to analyze and compare their similarities and differences in the perspectives of the characteristics of seismic response of soil layer and plastic zone distribution to provide a reference for the seismic design of slopes. The results show that in the perspective of soil seismic response analysis,the peak acceleration output and peak velocity output under multi-point input are greater than the peak values under single point input at the same monitoring point,the peak appearing time is also earlier than that of the single point input; in terms of the plastic zone distribution,the multi-point effect is manifested as the presence of more obvious tensile shear failures; in the perspective of safety coefficient,the safety coefficient under each multi-point input is smaller than that of single point input,a difference of about 7 % or so. In summary,multi-point input is more reasonable and practical than single point input,so multi-point input should be considered in seismic design.展开更多
天津陈塘庄电厂-迎丰变220 k V线路工程,是国网天津市电力公司全面贯彻全寿命周期管理理念的输电线路建设的先进典型。本文对工程的设计创新实践成果进行介绍,主要设计亮点有:新型节能导线应用、良导体地线和OPGW均采用分段绝缘单点接...天津陈塘庄电厂-迎丰变220 k V线路工程,是国网天津市电力公司全面贯彻全寿命周期管理理念的输电线路建设的先进典型。本文对工程的设计创新实践成果进行介绍,主要设计亮点有:新型节能导线应用、良导体地线和OPGW均采用分段绝缘单点接地运行方式、导线呈"双曲线"紧缩型布置杆塔规划设计、双回路(鹰嘴)蝶形钻越塔、大截面角钢应用、后注浆灌注桩、栈桥施工方案等。展开更多
基金funded by the Program of China Earthquake Science Data Sharing Platform and the Youth Fund(17404031570521)
文摘In general, the seismic response analysis in earthquake engineering assumes that the vibration parameters of the target and the contact surface of the external media are identical,i. e., single point input. However, earthquake energy has an attenuation phenomenon in wave propagation,so a wide range of soil slopes and the external medium contact surface of different input points on motion are not identical. If we consider single point input only, it may not correspond with reality, so it is necessary to carry out research on multi-point input methods. Based on the 2-D slope model,single-point input and multi-point input are performed respectively to analyze and compare their similarities and differences in the perspectives of the characteristics of seismic response of soil layer and plastic zone distribution to provide a reference for the seismic design of slopes. The results show that in the perspective of soil seismic response analysis,the peak acceleration output and peak velocity output under multi-point input are greater than the peak values under single point input at the same monitoring point,the peak appearing time is also earlier than that of the single point input; in terms of the plastic zone distribution,the multi-point effect is manifested as the presence of more obvious tensile shear failures; in the perspective of safety coefficient,the safety coefficient under each multi-point input is smaller than that of single point input,a difference of about 7 % or so. In summary,multi-point input is more reasonable and practical than single point input,so multi-point input should be considered in seismic design.
文摘天津陈塘庄电厂-迎丰变220 k V线路工程,是国网天津市电力公司全面贯彻全寿命周期管理理念的输电线路建设的先进典型。本文对工程的设计创新实践成果进行介绍,主要设计亮点有:新型节能导线应用、良导体地线和OPGW均采用分段绝缘单点接地运行方式、导线呈"双曲线"紧缩型布置杆塔规划设计、双回路(鹰嘴)蝶形钻越塔、大截面角钢应用、后注浆灌注桩、栈桥施工方案等。
