Search

当结构的高宽比较大时,在设防与罕遇地震作用下高烈度区的超高层结构的核心筒剪力墙可能承受倾覆力矩引起的巨大拉力,垂直于地震作用方向的核心筒翼墙受力状态接近于轴心受拉。由于混凝土抗拉强度较小,常采用钢板组合剪力墙来抵抗较大的墙肢拉力。采用非线性有限元法,对钢板组合剪力墙在轴心受拉作用下的开裂荷载、刚度变化、滞回性能与受拉承载力进行了较为全面的研究,表明混凝土对构件的轴拉承载力与刚度具有一定贡献。给出了钢板组合剪力墙在轴心受拉状态下最大裂缝宽度的计算方法,分析了墙体含钢率以及型钢、钢筋布置方式对裂缝宽度的影响。钢板组合剪力墙轴心受拉缩尺模型试验结果表明,有限元数值分析与模型试验吻合良好。在此基础上,提出了钢板组合剪力墙受拉状态下的设计建议。

根据国家体育场大跨度钢结构柱脚的受力特点,提出一种适用于大型钢结构的新型半埋入柱脚形式。在柱脚-混凝土承台模型的有限元分析与柱脚锚固件的锚固性能试验的基础上,形成了大型柱脚-混凝土承台的设计方法。该类柱脚在国家体育场钢结构中的实际应用情况表明,本文提出的柱脚形式与设计方法对于大型钢结构具有很好的适用性和广泛的应用前景。

钢-混凝土组合结构具有良好的力学性能和施工性能,采用组合技术建造桥梁能够产生很高的综合经济效益,近年来国内外的有关研究和工程应用越来越多。本文对钢-混凝土组合桥梁的研究及应用现状进行了简要介绍,其中包括控制混凝土开裂的技术措施、钢管混凝土在桥梁中的应用以及常用组合梁桥的典型构造形式等。最后,介绍了组合桥梁的部分技术创新成果和最新发展趋势。

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Mechanics / Gongcheng Lixue is the property of Engineering Mechanics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The welded reinforcement grid (WRG) is an alternative to conventional cross-and-tie reinforcement in concrete structures. However, the behavior of WRG as shear reinforcement in shear walls has not been thoroughly studied. The behavior of concrete shear walls reinforced with WRGs was examined through monotonic loading tests and quasi-static tests. Two specimens were subjected to monotonic loading and quasi-static loading. The WRGs were employed as horizontal distributed reinforcement. Two specimens were reinforced with an integral WRG, and the other two were reinforced with an overlapped WRG. The stiffness, shear capacity and failure mode as well as the development of strains in reinforcement were obtained and analyzed. The results indicate that the measured shear capacity of test specimens exceeded the value predicted by current Chinese code GB 50010—2010 ‘Code for design of concrete structures’. Compared with shear walls reinforced with traditional cross-and-tie reinforcement, WRG shear walls showed similar deformability. For specimens reinforced with overlapped WRGs, the shear capacity and the failure mode were similar to those of specimens reinforced with integral WRGs. The strain of horizontal distributed reinforcement at the position of overlap still attained its yield strain, which indicate that the capacity of reinforcement was fully exploited and the tensile force could be well transferred through the overlap zone. The RC shear walls reinforced with WRG showed a satisfactory shear capacity, which is similar to these with traditional cross-and-tie reinforcement. [ABSTRACT FROM AUTHOR]

To investigate the behavior of the transfer nodes for the oblique-cross steel columns, an experimental program of two transfer nodes under vertical and lateral monotonic load was conducted. The strength, stiffness, ductility, load transfer mechanism and processability were evaluated based on the results of loading tests. The satisfactory behavior and reliability of the nodes under the axial and lateral load was validated. No weld cracking occurs in the tests, which indicates that the utility of the Y-shaped connections when changing the web numbers guarantees the welding quality by enlarging the distance of welding seams. The FEM analysis shows that the lateral load ratio and the eccentricity are the sensitive factors for the deformation of the nodes. Studies on the load transfer mechanism of the node indicate that the plates of the nodes transfer loads cooperatively, and the stress mechanism near the wrist converts from the pressure field to the plane stress field in the final loading stage, with the horizontal plates mostly in tension. [ABSTRACT FROM AUTHOR]

The method of combining the natural vibration frequency adjustment and the acceleration response control is used to analyze the vibration comfort of the long span steel-concrete composite pedestrian in the Shenzhen Dayawan Development Zone. Fiber model based on the secondary development on the software MSC. MARC is built for the finite element calculation. The FORCDT subroutine function, which allows describing the load dependent on both time and location, is utilized to simulate the human walking. According to the design criteria of China and overseas for evaluating the comfort degree of footbridges, several loading conditions are considered to calculate the vertical acceleration time history. The influences of the damping ratio，integrating step size，structural mass，loading model and the spring connection on the bridge bearing are intensively analyzed. The results indicate that the large-span steelconcrete composite pedestrian satisfy the requirement of comfort degree for human walking. In addition, the spring connection construction is beneficial to the control of the crowd-induced vibration，which reduces the peak acceleration and support reaction by 14% and 54% respectively. [ABSTRACT FROM AUTHOR]

Axial compression ratio is closely related to the seismic behavior of steel plate concrete composite shear walls (SPCW). Effects of axial compression ratio on the lateral stiffness, hysteretic behavior, energy dissipation capacity, ductility and bearing capacity of SPCW were analyzed by elasto-plastic finite element software. The results show that SPCW normal section bearing capacity changes along with axial compression ratio and reaches the maximum when the axial compression ratio is 0.4. SPCW has the maximum ductility and energy dissipation capacity when the axial compression ratio is in the range of 0.2 to 0.4. The deformation capacity, ductility and energy dissipation capacity decrease if the axial compression ratio exceeds 0.6. Meanwhile, axial compression ratio influences the initial lateral stiffness of SPCW. Lateral stiffness decreases with the cycles of reversed loading. To verify the reliability of the finite element analysis, a scaled compression-bending SPCW specimen test was carried out. The finite element analysis results agree well with the test results. While the normal section bearing capacities calculated by formula of JGJ 138--2012 ' the code for design of composite structure ' and the fiber finite element model are conservative. In order to ensure good seismic behaviors of SPCW,the axial compression ratio should not be too high. [ABSTRACT FROM AUTHOR]