A bidirectional ribbed concrete beam slab structure was widly adopted for the upper space of industrial buildings.To maintain ample space and minimize the presence of conventional columns,a bidirectional prestressed c...A bidirectional ribbed concrete beam slab structure was widly adopted for the upper space of industrial buildings.To maintain ample space and minimize the presence of conventional columns,a bidirectional prestressed concrete beam is often employed.The intersection node of the prestressed concrete frame beam column was characterized by a high density of steel reinforcement,significant structural loads,and complex construction requirements.To ensure the quality,safety,and progress of prestressed frame beamcolumn intersection nodes during construction,this article proposed a new technology for constructing such nodes,which includes setting the tensioning and haunching ends of nodes at different positions,using ABAQUS finite element software to optimize the design of cross-sectional dimensions,conducting stress analysis simulations.展开更多
T shaped skin-stiffener joint are one of the most commonly used structures in aerospace components.It has been proven in various studies that these joints are susceptible to failure when loaded in pull out conditions ...T shaped skin-stiffener joint are one of the most commonly used structures in aerospace components.It has been proven in various studies that these joints are susceptible to failure when loaded in pull out conditions however,in specific applications these joints undergo pull loading.De-lamination/de-bond nucleation and its growth is one of the most common failure mechanisms in a fiber reinforced composite structure.Crack growth takes place due to the induced interlaminar normal and shear stresses between different structural constituents when a load is applied.In this study,Finite Element Analysis has been performed using cohesive contact interactions on a composite T-joint to simulate the pull out test conditions.A simplified shell based model coupled with CZM is proposed,which can evaluate the failure initiation and progression accurately with lesser computational efforts.The final failure occurred at a displacement of 4.71 mm at the computed failure load of 472.57 kgf for basic configuration.Computed Failure load for the padded configuration is 672.8 kgf and corresponding displacement is 4.6 mm.The results obtained by the proposed numerical model are validated by experimental results and it is observed that predicted failure displacements and failure load calculated were correlating reasonably well with the experiment.展开更多
Morphostructural nodes in North Vietnam are delineated with the morphostructural zoning （MZ） method, and classified into seismogenic and non-seismogenic nodes. The compiled morphostructural map （ scale 1 ： 1000000...Morphostructural nodes in North Vietnam are delineated with the morphostructural zoning （MZ） method, and classified into seismogenic and non-seismogenic nodes. The compiled morphostructural map （ scale 1 ： 1000000） shows a three-level hierarchical structure of blocks, boundary zones, and nodes. The identified nodes are classified with the pattern-recognition algorithm CORA-3 into those that are prone to generate M≥5.0 earthquakes and those that are not. Some of the earthquake-prone nodes coincide with epicenters of M ≥ 5.0 earthquakes that have occurred ; others may coincide with such events in the future.展开更多
在低气压环境下对两节点模型进行了修正,同时通过实测皮肤温度验证了其准确性。在此基础上对热环境评价指标——标准有效温度(SET*)进行了计算,分析了低气压下SET*的变化规律,并在不同低气压环境下对ASHRAE Standard 55中的舒适区进行...在低气压环境下对两节点模型进行了修正,同时通过实测皮肤温度验证了其准确性。在此基础上对热环境评价指标——标准有效温度(SET*)进行了计算,分析了低气压下SET*的变化规律,并在不同低气压环境下对ASHRAE Standard 55中的舒适区进行了修正。计算结果表明,在相同环境参数条件下,随着大气压力的降低,对应的标准有效温度降低。相应地,随大气压力的下降,人体舒适区范围向干球温度较高的方向移动。低气压环境下舒适区对应的干球温度上下限值均比常压下高,且温差范围增大。展开更多
基金Funded by the Nantong Science and Technology Plan Project(No.JC2021172)the Cyan and Blue Project of Universities in Jiangsu Province。
文摘A bidirectional ribbed concrete beam slab structure was widly adopted for the upper space of industrial buildings.To maintain ample space and minimize the presence of conventional columns,a bidirectional prestressed concrete beam is often employed.The intersection node of the prestressed concrete frame beam column was characterized by a high density of steel reinforcement,significant structural loads,and complex construction requirements.To ensure the quality,safety,and progress of prestressed frame beamcolumn intersection nodes during construction,this article proposed a new technology for constructing such nodes,which includes setting the tensioning and haunching ends of nodes at different positions,using ABAQUS finite element software to optimize the design of cross-sectional dimensions,conducting stress analysis simulations.
文摘T shaped skin-stiffener joint are one of the most commonly used structures in aerospace components.It has been proven in various studies that these joints are susceptible to failure when loaded in pull out conditions however,in specific applications these joints undergo pull loading.De-lamination/de-bond nucleation and its growth is one of the most common failure mechanisms in a fiber reinforced composite structure.Crack growth takes place due to the induced interlaminar normal and shear stresses between different structural constituents when a load is applied.In this study,Finite Element Analysis has been performed using cohesive contact interactions on a composite T-joint to simulate the pull out test conditions.A simplified shell based model coupled with CZM is proposed,which can evaluate the failure initiation and progression accurately with lesser computational efforts.The final failure occurred at a displacement of 4.71 mm at the computed failure load of 472.57 kgf for basic configuration.Computed Failure load for the padded configuration is 672.8 kgf and corresponding displacement is 4.6 mm.The results obtained by the proposed numerical model are validated by experimental results and it is observed that predicted failure displacements and failure load calculated were correlating reasonably well with the experiment.
文摘Morphostructural nodes in North Vietnam are delineated with the morphostructural zoning （MZ） method, and classified into seismogenic and non-seismogenic nodes. The compiled morphostructural map （ scale 1 ： 1000000） shows a three-level hierarchical structure of blocks, boundary zones, and nodes. The identified nodes are classified with the pattern-recognition algorithm CORA-3 into those that are prone to generate M≥5.0 earthquakes and those that are not. Some of the earthquake-prone nodes coincide with epicenters of M ≥ 5.0 earthquakes that have occurred ; others may coincide with such events in the future.
文摘在低气压环境下对两节点模型进行了修正,同时通过实测皮肤温度验证了其准确性。在此基础上对热环境评价指标——标准有效温度(SET*)进行了计算,分析了低气压下SET*的变化规律,并在不同低气压环境下对ASHRAE Standard 55中的舒适区进行了修正。计算结果表明,在相同环境参数条件下,随着大气压力的降低,对应的标准有效温度降低。相应地,随大气压力的下降,人体舒适区范围向干球温度较高的方向移动。低气压环境下舒适区对应的干球温度上下限值均比常压下高,且温差范围增大。
