The column-to-beam flexural strength ratio(CBFSR)has been used in many seismic codes to achieve the strong column-weak beam(SCWB)failure mode in reinforced concrete(RC)frames,in which plastic hinges appear earlier in ...The column-to-beam flexural strength ratio(CBFSR)has been used in many seismic codes to achieve the strong column-weak beam(SCWB)failure mode in reinforced concrete(RC)frames,in which plastic hinges appear earlier in beams than in columns.However,seismic investigations show that the required limit of CBFSR in seismic codes usually cannot achieve the SCWB failure mode under strong earthquakes.This study investigates the failure modes of RC frames with different CBFSRs.Nine typical three-story RC frame models with different CBFSRs are designed in accordance with Chinese seismic codes.The seismic responses and failure modes of the frames are investigated through time-history analyses using 100 ground motion records.The results show that the required limit of the CBFSR that guarantees the SCWB failure mode depends on the beam-column connection type and the seismic intensity,and different types of beam-column connections exhibit different failure modes even though they are designed with the same CBFSR.Recommended CBFSRs are proposed for achieving the designed SCWB failure mode for different types of connections in RC frames under different seismic intensities.These results may provide some reference for further revisions of the SCWB design criterion in Chinese seismic codes.展开更多
H-steel all-bolted connection steel frame structures with heat preservation and decoration composite wall boards were investigated and the seismic performances of three scaled specimens were studied.The failure modes,...H-steel all-bolted connection steel frame structures with heat preservation and decoration composite wall boards were investigated and the seismic performances of three scaled specimens were studied.The failure modes,hysteresis curves,bearing capacity,ductility,energy dissipation capacity,stiffness degradation and strain distribution were discussed.The calculation method of structural theoretical internal force was presented.The results showed that the overall structural seismic performance was better,and the structural ductility met the demands of elastic-plastic inter-story drift angle for seismic design.The H-steel weak-axis connection structure obtained better energy dissipation capacity,and its bearing capacity and stiffness were slightly different from the strong-axis connection.The heat preservation and decoration performance of composite wallboard and the all-bolted connection of the steel frame realized prefabrication during the whole construction period.The plastic hinge of the steel beam can be moved outwards because of the L-angles,which effectively avoids stress concentration in joint areas and expands the plastic hinge range.The errors between the theoretical structural capacity calculated by the plastic analysis method and the test results were within 2.44%.In addition,structural failure mechanisms and bearing capacities were verified by the finite element(FE)analysis,and the effects of the main parameters on the structures were investigated.The FE verification results were the same as in the test.The research results provide theoretical support and technical guidance for the application of thermal insulation and decorative composite wall panels in H-shaped steel all-bolted steel frames.展开更多
针对酒店的运营质量和管理效率需求,文章采用C#语言编写、结合.NET三层架构,利用SQL Server 2008数据库存储数据设计并实现酒店管理系统。文章首先对系统进行分析,然后依次对系统、数据库、及界面进行设计,最后实现了基于.NET三层架构...针对酒店的运营质量和管理效率需求,文章采用C#语言编写、结合.NET三层架构,利用SQL Server 2008数据库存储数据设计并实现酒店管理系统。文章首先对系统进行分析,然后依次对系统、数据库、及界面进行设计,最后实现了基于.NET三层架构的酒店管理系统。展开更多
应用ASP.NET,ADO.NET和SQL Server 2000等方面的技术,设计实现了Web人事管理系统,在设计和实现过程中充分利用三层架构对系统进行了优化.文章简要论述了该系统的设计与实现方法,该系统的设计提高了高校人事管理工作的效率,实现了数据共...应用ASP.NET,ADO.NET和SQL Server 2000等方面的技术,设计实现了Web人事管理系统,在设计和实现过程中充分利用三层架构对系统进行了优化.文章简要论述了该系统的设计与实现方法,该系统的设计提高了高校人事管理工作的效率,实现了数据共享,并对高校的行政管理工作起到了积极有力的促进作用.展开更多
针对销售的运营质量和管理效率需求,文章采用C#语言编写、结合.NET三层架构,利用SQL Server 2008数据库存储数据设计并实现销售管理系统。文章首先对系统进行分析,然后依次对系统、数据库及界面进行设计,最后实现了基于.NET三层架构的...针对销售的运营质量和管理效率需求,文章采用C#语言编写、结合.NET三层架构,利用SQL Server 2008数据库存储数据设计并实现销售管理系统。文章首先对系统进行分析,然后依次对系统、数据库及界面进行设计,最后实现了基于.NET三层架构的销售管理系统。展开更多
In order to reduce the encoding complexity of macroblock coding mode decision in H.264/AVC, a selective smaller block-size searching algorithm and a selective intra coding mode searching algorithm are proposed by usin...In order to reduce the encoding complexity of macroblock coding mode decision in H.264/AVC, a selective smaller block-size searching algorithm and a selective intra coding mode searching algorithm are proposed by using the high correlation among coding modes and in spatial and temporal domains of video sequence. Simulation results demonstrate that the proposed algorithm can provide significant improvement in computational requirement, with negligible small picture quality degradation and slight bit rate increase.展开更多
信息化管理平台的建设是测站提高管理水平,更好地发挥示范辐射作用,确保测站管理质量的重要保证。为进一步提高测站信息化管理水平,在对测站管理进行了充分了解的基础上,采用ASP.NET 3.5与SQL SERVER 2005相结合,对测站信息化管理系统...信息化管理平台的建设是测站提高管理水平,更好地发挥示范辐射作用,确保测站管理质量的重要保证。为进一步提高测站信息化管理水平,在对测站管理进行了充分了解的基础上,采用ASP.NET 3.5与SQL SERVER 2005相结合,对测站信息化管理系统的开发进行了研究,系统架构由表示层(WEB)、业务逻辑层(BLL)、数据访问层(DAL)三个层组成,具有易扩展、易维护、开放化、智能化和安全可靠等特点。展开更多
Spatial structures such as a gymnasium and an exhibition hall often use ceilings because of enhancing sound effects and reducing heating bills. Although the ceiling members fell down on a large scale due to the seismi...Spatial structures such as a gymnasium and an exhibition hall often use ceilings because of enhancing sound effects and reducing heating bills. Although the ceiling members fell down on a large scale due to the seismic motion according to the past great earthquake disaster reports, structural engineers particularly do not carry out the seismic design. The study gives structural engineers the equivalent static loads for the design of the earthquake-proof design of the ceiling system. In particular, it is significant to investigate the dynamic behavior and the applied seismic loads for the complicated vibration of the long span arch building structures with RC columns.展开更多
基金National Key R&D Program of China under Grant No.2017YFC1500601National Natural Science Foundation of China under Grant Nos.51678541 and 51708523Scientific Research Fund of the Institute of Engineering Mechanics,China Earthquake Administration under Grant No.2016A01。
文摘The column-to-beam flexural strength ratio(CBFSR)has been used in many seismic codes to achieve the strong column-weak beam(SCWB)failure mode in reinforced concrete(RC)frames,in which plastic hinges appear earlier in beams than in columns.However,seismic investigations show that the required limit of CBFSR in seismic codes usually cannot achieve the SCWB failure mode under strong earthquakes.This study investigates the failure modes of RC frames with different CBFSRs.Nine typical three-story RC frame models with different CBFSRs are designed in accordance with Chinese seismic codes.The seismic responses and failure modes of the frames are investigated through time-history analyses using 100 ground motion records.The results show that the required limit of the CBFSR that guarantees the SCWB failure mode depends on the beam-column connection type and the seismic intensity,and different types of beam-column connections exhibit different failure modes even though they are designed with the same CBFSR.Recommended CBFSRs are proposed for achieving the designed SCWB failure mode for different types of connections in RC frames under different seismic intensities.These results may provide some reference for further revisions of the SCWB design criterion in Chinese seismic codes.
文摘H-steel all-bolted connection steel frame structures with heat preservation and decoration composite wall boards were investigated and the seismic performances of three scaled specimens were studied.The failure modes,hysteresis curves,bearing capacity,ductility,energy dissipation capacity,stiffness degradation and strain distribution were discussed.The calculation method of structural theoretical internal force was presented.The results showed that the overall structural seismic performance was better,and the structural ductility met the demands of elastic-plastic inter-story drift angle for seismic design.The H-steel weak-axis connection structure obtained better energy dissipation capacity,and its bearing capacity and stiffness were slightly different from the strong-axis connection.The heat preservation and decoration performance of composite wallboard and the all-bolted connection of the steel frame realized prefabrication during the whole construction period.The plastic hinge of the steel beam can be moved outwards because of the L-angles,which effectively avoids stress concentration in joint areas and expands the plastic hinge range.The errors between the theoretical structural capacity calculated by the plastic analysis method and the test results were within 2.44%.In addition,structural failure mechanisms and bearing capacities were verified by the finite element(FE)analysis,and the effects of the main parameters on the structures were investigated.The FE verification results were the same as in the test.The research results provide theoretical support and technical guidance for the application of thermal insulation and decorative composite wall panels in H-shaped steel all-bolted steel frames.
文摘应用ASP.NET,ADO.NET和SQL Server 2000等方面的技术,设计实现了Web人事管理系统,在设计和实现过程中充分利用三层架构对系统进行了优化.文章简要论述了该系统的设计与实现方法,该系统的设计提高了高校人事管理工作的效率,实现了数据共享,并对高校的行政管理工作起到了积极有力的促进作用.
基金National Natural Science Foundation of China (60372018)
文摘In order to reduce the encoding complexity of macroblock coding mode decision in H.264/AVC, a selective smaller block-size searching algorithm and a selective intra coding mode searching algorithm are proposed by using the high correlation among coding modes and in spatial and temporal domains of video sequence. Simulation results demonstrate that the proposed algorithm can provide significant improvement in computational requirement, with negligible small picture quality degradation and slight bit rate increase.
文摘信息化管理平台的建设是测站提高管理水平,更好地发挥示范辐射作用,确保测站管理质量的重要保证。为进一步提高测站信息化管理水平,在对测站管理进行了充分了解的基础上,采用ASP.NET 3.5与SQL SERVER 2005相结合,对测站信息化管理系统的开发进行了研究,系统架构由表示层(WEB)、业务逻辑层(BLL)、数据访问层(DAL)三个层组成,具有易扩展、易维护、开放化、智能化和安全可靠等特点。
文摘Spatial structures such as a gymnasium and an exhibition hall often use ceilings because of enhancing sound effects and reducing heating bills. Although the ceiling members fell down on a large scale due to the seismic motion according to the past great earthquake disaster reports, structural engineers particularly do not carry out the seismic design. The study gives structural engineers the equivalent static loads for the design of the earthquake-proof design of the ceiling system. In particular, it is significant to investigate the dynamic behavior and the applied seismic loads for the complicated vibration of the long span arch building structures with RC columns.
