实现建筑结构抗震加固强度优化检测,始终是增强建筑结构强度的重要保障。近年来,为全面增强建筑物抗震性能,增强建筑结构抗震加固强度,相关人员将建筑信息模型(Building Information Modeling,BIM)技术引入建筑结构抗震加固强度自动检...实现建筑结构抗震加固强度优化检测,始终是增强建筑结构强度的重要保障。近年来,为全面增强建筑物抗震性能,增强建筑结构抗震加固强度,相关人员将建筑信息模型(Building Information Modeling,BIM)技术引入建筑结构抗震加固强度自动检测工作。通过合理使用,基本上可以规避传统技术方法存在的短板问题,进一步提高了检测精度和建筑结构抗震加固能力。鉴于BIM技术的重要性,主要结合BIM技术应用优势和应用情况,对基于BIM技术的建筑结构抗震加固强度自动检测方法进行研究分析。研究分析表明,此种方法可以实现建筑结构抗震加固强度自动检测过程,有利于增强建筑结构的抗震强度和加固效果。展开更多
为了探讨不同聚土比(地聚合物质量与软土湿土质量之比)和不同龄期下地聚合物加固软土强度的变化规律,设计了10%,12%,14%3种聚土比,按照7,28,60 d 3个龄期进行直接剪切试验和无侧限抗压强度试验,发现:其强度随着聚土比的增加而提高,同一...为了探讨不同聚土比(地聚合物质量与软土湿土质量之比)和不同龄期下地聚合物加固软土强度的变化规律,设计了10%,12%,14%3种聚土比,按照7,28,60 d 3个龄期进行直接剪切试验和无侧限抗压强度试验,发现:其强度随着聚土比的增加而提高,同一聚土比下随着龄期延长而提高;当聚土比为14%时,地聚合物处理软土的效果比较好。同时通过SEM扫描和CT扫描试验分析了软土加固后的微观结构特征,并在此基础上对微观结构与宏观性能之间的关系进行了分析。宏观与微观关系是强度越高,结构空隙越少。研究成果为地聚合物加固软土在实际工程中的应用提供了科学依据。展开更多
A theoretical calculation method of the axial compressive strength of a high strength concrete with fibre reinforced plastics (FRP) constraint is proposed. It is shown by test verification that the FRP strength devoti...A theoretical calculation method of the axial compressive strength of a high strength concrete with fibre reinforced plastics (FRP) constraint is proposed. It is shown by test verification that the FRP strength devotion factor used for this method is in accordance with actual conditions. FRP is not up to the ultimate strength when the concrete reaches the ultimate strength, whose strength devotion factor is in the range of 0.28 to 0.59, which is related to an elastic modulus. The method can be used to estimate axial compressive strength of the concrete strengthened with FRP. The theoretical strength is 10% to 30% higher than the measured one. The deviation comes mainly from a non-ideal bonding condition of FRP-concrete interfaces and discrete property of the testing data of compressive strength.展开更多
The reinforcement and stabilization of loess soil are duscussed by using fibers as the reinforcement and cement as the stabilization materials.To study the strength characteristics of loess soil reinforced by modified...The reinforcement and stabilization of loess soil are duscussed by using fibers as the reinforcement and cement as the stabilization materials.To study the strength characteristics of loess soil reinforced by modified polypropylene(MPP) fiber and cement,samples were prepared with six different fiber contents,three different cement contents,three different curing periods and three kinds of fiber length.The samples were tested under submergence and non-submergence conditions for the unconfined compressive strength(UCS),the splitting tensile strength and the compressive resilient modulus.The results indicated that combined reinforcement by PP fiber and cement could significantly improve the early strength of loess to 3.65–5.99 MPa in three days.With an increase in cement content,the specimens exhibited brittle fracture.However,the addition of fibers gradually modified the mode of fracture from brittle to ductile to plastic.The optimal dosage of fiber to reinforce loess was in the range of 0.3%–0.45% and the optimum fiber length was 12 mm,for which the unconfined compressive strength and tensile strength reached their maxima.Based on the analysis of failure properties,cement-reinforced loess specimens were susceptible to brittle damage under pressure,and the effect of modified polypropylene fiber as the connecting "bridge" could help the specimens achieve a satisfactory level of ductility when under pressure.展开更多
文摘实现建筑结构抗震加固强度优化检测,始终是增强建筑结构强度的重要保障。近年来,为全面增强建筑物抗震性能,增强建筑结构抗震加固强度,相关人员将建筑信息模型(Building Information Modeling,BIM)技术引入建筑结构抗震加固强度自动检测工作。通过合理使用,基本上可以规避传统技术方法存在的短板问题,进一步提高了检测精度和建筑结构抗震加固能力。鉴于BIM技术的重要性,主要结合BIM技术应用优势和应用情况,对基于BIM技术的建筑结构抗震加固强度自动检测方法进行研究分析。研究分析表明,此种方法可以实现建筑结构抗震加固强度自动检测过程,有利于增强建筑结构的抗震强度和加固效果。
文摘为了探讨不同聚土比(地聚合物质量与软土湿土质量之比)和不同龄期下地聚合物加固软土强度的变化规律,设计了10%,12%,14%3种聚土比,按照7,28,60 d 3个龄期进行直接剪切试验和无侧限抗压强度试验,发现:其强度随着聚土比的增加而提高,同一聚土比下随着龄期延长而提高;当聚土比为14%时,地聚合物处理软土的效果比较好。同时通过SEM扫描和CT扫描试验分析了软土加固后的微观结构特征,并在此基础上对微观结构与宏观性能之间的关系进行了分析。宏观与微观关系是强度越高,结构空隙越少。研究成果为地聚合物加固软土在实际工程中的应用提供了科学依据。
文摘A theoretical calculation method of the axial compressive strength of a high strength concrete with fibre reinforced plastics (FRP) constraint is proposed. It is shown by test verification that the FRP strength devotion factor used for this method is in accordance with actual conditions. FRP is not up to the ultimate strength when the concrete reaches the ultimate strength, whose strength devotion factor is in the range of 0.28 to 0.59, which is related to an elastic modulus. The method can be used to estimate axial compressive strength of the concrete strengthened with FRP. The theoretical strength is 10% to 30% higher than the measured one. The deviation comes mainly from a non-ideal bonding condition of FRP-concrete interfaces and discrete property of the testing data of compressive strength.
基金Project(050101)supported by Horizontal Research Foundation of PLA Air Force Engineering University,ChinaProject(51478462)supported by the National Natural Science Foundation of China
文摘The reinforcement and stabilization of loess soil are duscussed by using fibers as the reinforcement and cement as the stabilization materials.To study the strength characteristics of loess soil reinforced by modified polypropylene(MPP) fiber and cement,samples were prepared with six different fiber contents,three different cement contents,three different curing periods and three kinds of fiber length.The samples were tested under submergence and non-submergence conditions for the unconfined compressive strength(UCS),the splitting tensile strength and the compressive resilient modulus.The results indicated that combined reinforcement by PP fiber and cement could significantly improve the early strength of loess to 3.65–5.99 MPa in three days.With an increase in cement content,the specimens exhibited brittle fracture.However,the addition of fibers gradually modified the mode of fracture from brittle to ductile to plastic.The optimal dosage of fiber to reinforce loess was in the range of 0.3%–0.45% and the optimum fiber length was 12 mm,for which the unconfined compressive strength and tensile strength reached their maxima.Based on the analysis of failure properties,cement-reinforced loess specimens were susceptible to brittle damage under pressure,and the effect of modified polypropylene fiber as the connecting "bridge" could help the specimens achieve a satisfactory level of ductility when under pressure.
