According to the Code for Seismic Design of Buildings （GB50011-2001）, ten typical reinforced concrete （RC） frame structures, used as school classroom buildings, are designed with different seismic fortification in...According to the Code for Seismic Design of Buildings （GB50011-2001）, ten typical reinforced concrete （RC） frame structures, used as school classroom buildings, are designed with different seismic fortification intensities （SFIs） （SFI=6 to 8.5） and different seismic design categories （SDCs） （SDC=B and C）. The collapse resistance of the frames with SDC=B and C in terms of collapse fragility curves are quantitatively evaluated and compared via incremental dynamic analysis （IDA）. The results show that the collapse resistance of structures should be evaluated based on both the absolute seismic resistance and the corresponding design seismic intensity. For the frames with SFI from 6 to 7.5, because they have relatively low absolute seismic resistance, their collapse resistance is insufficient even when their corresponding SDCs are upgraded from B to C. Thus, further measures are needed to enhance these structures, and some suggestions are proposed.展开更多
The seismic design criterion adopted in the existing seismic design codes is reviewed. It is pointed out that the presently used seismic design criterion is not satisfied with the requirements of nowadays social and e...The seismic design criterion adopted in the existing seismic design codes is reviewed. It is pointed out that the presently used seismic design criterion is not satisfied with the requirements of nowadays social and economic development. A new performance-based seismic design criterion that is composed of three components is presented in this paper. It can not only effectively control the economic losses and casualty, but also ensure the building's function in proper operation during earthquakes. The three components are: classification of seismic design for buildings, determination of seismic design intensity and/or seismic design ground motion for controlling seismic economic losses and casualties, and determination of the importance factors in terms of service periods of buildings. For controlling the seismic human losses, the idea of socially acceptable casualty level is presented and the 'Optimal Economic Decision Model' and 'Optimal Safe Decision Model' are established. Finally, a new method is recommended for calculating the importance factors of structures by adjusting structures service period on the base of more important structure with longer service period than the conventional ones. Therefore, the more important structure with longer service periods will be designed for higher seismic loads, in case the exceedance probability of seismic hazard in different service period is same.展开更多
2020年1月16日新疆库车5.6级地震造成库车市塔里木乡居民房屋不同程度破坏。依据地震现场1个乡18个调查点的实地调查结果,初步分析此次地震的烈度分布和房屋震害特征。结果表明:地震灾区最高烈度为Ⅵ度,受灾面积为813.6 km 2,涉及185户...2020年1月16日新疆库车5.6级地震造成库车市塔里木乡居民房屋不同程度破坏。依据地震现场1个乡18个调查点的实地调查结果,初步分析此次地震的烈度分布和房屋震害特征。结果表明:地震灾区最高烈度为Ⅵ度,受灾面积为813.6 km 2,涉及185户685人,无人员伤亡;建造年代较早的砖木结构抗震安居房,由于抗震设防烈度较低,部分房屋抗震构造措施不完善,破坏程度相对较重;少数砖混结构房屋因地基沉降及地震叠加破坏作用,造成门窗洞口处墙体出现裂缝;框架结构房屋受场地地震动放大影响出现填充墙开裂现象。展开更多
基金National Science Foundation of China Under Grant No.90815025&51178249the National Key Technologies R&D Program Under Grant No.2009BAJ28B01&2006BAJ03A02-01+1 种基金Tsinghua University Research Funds No.2010THZ02-1the Program for New Century Excellent Talents in University
文摘According to the Code for Seismic Design of Buildings （GB50011-2001）, ten typical reinforced concrete （RC） frame structures, used as school classroom buildings, are designed with different seismic fortification intensities （SFIs） （SFI=6 to 8.5） and different seismic design categories （SDCs） （SDC=B and C）. The collapse resistance of the frames with SDC=B and C in terms of collapse fragility curves are quantitatively evaluated and compared via incremental dynamic analysis （IDA）. The results show that the collapse resistance of structures should be evaluated based on both the absolute seismic resistance and the corresponding design seismic intensity. For the frames with SFI from 6 to 7.5, because they have relatively low absolute seismic resistance, their collapse resistance is insufficient even when their corresponding SDCs are upgraded from B to C. Thus, further measures are needed to enhance these structures, and some suggestions are proposed.
基金Chinese National Natural Science Foundation with the grant No.59895410the China Basic Research and Development Project:the Mechanism and Prediction of the Strong Earthquake of the Continental under the Grant No.95130603
文摘The seismic design criterion adopted in the existing seismic design codes is reviewed. It is pointed out that the presently used seismic design criterion is not satisfied with the requirements of nowadays social and economic development. A new performance-based seismic design criterion that is composed of three components is presented in this paper. It can not only effectively control the economic losses and casualty, but also ensure the building's function in proper operation during earthquakes. The three components are: classification of seismic design for buildings, determination of seismic design intensity and/or seismic design ground motion for controlling seismic economic losses and casualties, and determination of the importance factors in terms of service periods of buildings. For controlling the seismic human losses, the idea of socially acceptable casualty level is presented and the 'Optimal Economic Decision Model' and 'Optimal Safe Decision Model' are established. Finally, a new method is recommended for calculating the importance factors of structures by adjusting structures service period on the base of more important structure with longer service period than the conventional ones. Therefore, the more important structure with longer service periods will be designed for higher seismic loads, in case the exceedance probability of seismic hazard in different service period is same.
文摘2020年1月16日新疆库车5.6级地震造成库车市塔里木乡居民房屋不同程度破坏。依据地震现场1个乡18个调查点的实地调查结果,初步分析此次地震的烈度分布和房屋震害特征。结果表明:地震灾区最高烈度为Ⅵ度,受灾面积为813.6 km 2,涉及185户685人,无人员伤亡;建造年代较早的砖木结构抗震安居房,由于抗震设防烈度较低,部分房屋抗震构造措施不完善,破坏程度相对较重;少数砖混结构房屋因地基沉降及地震叠加破坏作用,造成门窗洞口处墙体出现裂缝;框架结构房屋受场地地震动放大影响出现填充墙开裂现象。
