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Hysteretic behavior of cambered surface steel tube damper:Theoretical and experimental research

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Frontiers of Structural and Civil Engineering 2023年第4期17卷 606-624页

作者： Jiale LI Yun ZHOU Zhiming HE Genquan ZHONG Chao ZHANG Department of Civil Engineering Guangzhou UniversityGuangzhou 510006China Department of Civil&Transportation Engineering Guangdong University of TechnologyGuangzhou 510006China

A novel cambered surface steel tube damper(CSTD)with a cambered surface steel tube and two concave connecting plates is proposed *** steel tube is the main energy dissipation component and comprises a weakened segment in the middle,a transition segment,and an embedded *** is believed that during an earthquake,the middle weakened segment of the CSTD will be damaged,whereas the reliability of the end connection is *** and experimental studies are conducted to verify the effectiveness of the proposed *** for the initial stiffness and yield force of the CSTD are ***,two CSTD specimens with different steel tube thicknesses are fabricated and tested under cyclic quasi-static *** result shows that the CSTD yields a stable hysteretic response and affords excellent energy dissipation.A parametric study is conducted to investigate the effects of the steel tube height,diameter,and thickness on the seismic performance of the *** with equalstiffness design steel tube dampers,the CSTD exhibits better energy dissipation performance,more stable hysteretic response,and better uniformity in plastic deformation distributions.

关键词： cambered surface steel tube damper energy dissipation capacity finite element model hysteretic performance parametric study

Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

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Frontiers of Structural and Civil Engineering 2023年第5期17卷 763-779页

作者： Hua-Fei HE Zhao-Ping LI Shao-Lin MA Xiang-Yang CUI School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China

A disadvantage of the conventional quasi-static test method is that it does not consider the soil restraint effect.A new method to test the seismic performance of prefabricated specimens for underground assembled structures is proposed,which can realistically reflect the strata restraint effect on the underground *** work combined with finite element(FE)analysis is performed in this *** full-scale sidewall specimens with different joint forms are designed and *** related to the seismic performance and damage modes are analyzed comprehensively to reveal the mechanism of the strata restraint effect on the prefabricated sidewall *** results show that the strata restraint effect effectively improves the energy dissipation capacity,load-bearing capacity,and the recoverability of the internal deformation of the precast sidewall ***,the strata restraint effect reduces the ductility of the precast sidewall components and aggravates the shear and bending deformations in the core region of the connection ***,the strata restraint effect significantly affects the seismic performance and damage mode of the prefabricated sidewall *** FE model that can be used to conduct a seismic performance study of prefabricated specimens for underground assembled structures is proposed,and its feasibility is verified via comparison with test data.

关键词： underground structures precast sidewall specimen seismic test method bearing capacity energy dissipation capacity plastic deformation

Field testing of stiffened deep cement mixing piles under lateral cyclic loading

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Earthquake Engineering and Engineering Vibration 2013年第2期12卷 261-265页

作者： Werasak Raongjant Meng Jing Department of Civil Engineering Faculty of EngineeringRajamangala University of Technology

Construction of seaside and underground wall bracing often uses stiffened deep cement mixed columns （SDCM）. This research investigates methods used to improve the level of bearing capacity of these SDCM when subjected to cyclic lateral loading via various types of stiffer cores. Eight piles, two deep cement mixed piles and six stiffened deep cement mixing piles with three different types of cores, H shape cross section prestressed concrete, steel pipe, and H-beam steel, were embedded though soft clay into medium-hard clay on site in Thailand. Cyclic horizontal loading was gradually applied until pile failure and the hysteresis loops of lateral load vs. lateral deformation were recorded. The lateral carrying capacities of the SDCM piles with an H-beam steel core increased by 3-4 times that of the DCM piles. This field research clearly shows that using H-beam steel as a stiffer core for SDCM piles is the best method to improve its lateral carrying capacity, ductility and energy dissipation capacity.

关键词： stiffened deep cement mixing pile lateral capacity cyclic lateral loading energy dissipation capacity field testing

Mechanical properties of monodirectional Gutou mortise-tenon joints of the traditional timber buildings in the Yangtze River region

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Journal of Southeast University(English Edition) 2016年第4期32卷 457-463页

作者：淳庆韩宜丹孟哲东南大学建筑学院南京210096 东南大学城市与建筑遗产保护教育部重点实验室南京210096

The mechanical properties of the monodirectional Gutou mortise-tenon joints of the ancient Chinese traditional timber buildings in the Yangtze River region were studied using the experimental method. Three monodirectional Gutou mortise-tenon joints were designed according to the actual configurations. The failure modes,the hysteretic curves,the skeleton curves, the rotation rigidities, and the energy dissipation capacity of this type of mortise-tenon joints under the low cyclic reversed loading were obtained. The results show that the hysteretic curves of the monodirectional Gutou mortise-tenon joints appear to be Z shape and have obvious pinch effects. During the process of the test,these mortisetenon joints pass orderly through the elastic stage,the yield stage and the failure stage. The energy dissipation capacity of these mortise-tenon joints generally decreases with the increase in the rotation angle. The equivalent viscous damping coefficients of the monodirectional Gutou mortise-tenon joints are between 0. 161 and 0. 193. The results can provide the theoretical base for the computing analysis and repair design of Chinese traditional timber buildings in the Yangtze River region.

关键词： traditional timber building monodirectional Gutou mortise-tenon joint mechanical property energy dissipation capacity

预制混凝土剪力墙水平干式连接的抗震性能的数值研究

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预制混凝土剪力墙水平干式连接的抗震性能的数值研究

作者： Emmanuel Wayne Sookree 浙江科技学院

学位级别：硕士

Dry connections,primarily consisting of high-strength bolts and steel plates,are commonly used in precast *** on their configuration and load-transfer mechanism,the connection methods can be classified as horizontal and vertical dry connections.A horizontal dry connection comprising square-shaped ring connectors made of Q235 steel tube,high-strength hex nuts and flat washers,and small volumes of grout to embed the connection’s components post-assembly,is proposed as a longterm solution to some of the drawbacks associated with bolted connections.A numerical study was conducted on two full-scale RC shear walls,including one monolithic and one precast specimen,to assess the effectiveness of the connection method under fully reversed cyclic lateral loading.A parametric study was also carried out on the thickness and grade of the steel tube,grade of the vertical steel bars,number of ring connectors,and diameter of the vertical steel bars at the connection *** displacement ductility of the precast specimen integrating the proposed bolted connection was nearly twice as much as the reference ***,its relative energy dissipation capacity and shear strength were about 49% and 25.56%lower,*** in the thickness and grade of the steel tube showed no apparent improvements in the seismic performance of the bolted *** numerical results indicated that increasing the diameter of the vertical steel bars at the connection joints was most effective,registering an increase in shear strength and energy dissipation of 14.17% and 36.39%,respectively,when the diameter was changed from 12 mm to 16 mm.

关键词： Dry connections horizontal dry connection precast concrete shear walls seismic performance cyclic loading energy dissipation capacity