风荷载作用下驻马店市高层建筑的剪力墙结构连梁设计研究

高层建筑中剪力墙重要组件之一为连梁,它是剪力墙墙肢间传递荷载力的纽带,在外力荷载作用下,混凝土连梁易受损伤,从而影响剪力墙整体结构。在风荷载作用下,对驻马店市高层建筑剪力墙连梁进行有效设计。为有效分析建筑剪力墙抗震性能,实验设计了两个单跨两层剪力墙试件,试件分别设定为刚度相同的钢筋混凝土连梁及钢桁架连梁。运用倒三角加载模式,对试件实行低周反复荷载实验,对比分别采用钢筋设计及钢桁架设计的不同剪力墙连梁抗震性能差异。从试件裂缝发展规律、破坏形态、延性变化及承载力方面进行数据分析,获得了连梁破坏机理。结果表明,钢桁架连梁剪力墙试件较普通钢筋混凝土连梁试件受力分布更加均匀,刚退化程度缓慢。实验通过提高配钢率获知配钢率高的钢桁架混凝土剪力墙具有更强变形能力及耗能能力。

内嵌钢板及边缘框架相互作用对带连梁低屈服点钢板剪力墙结构受力性能的影响

为满足快速发展的高层建筑结构对抗震性能及空间灵活性的要求,将高耗能能力、高延性的低屈服点钢材与带连梁钢板剪力墙组合成新型带连梁低屈服点钢板剪力墙结构体系。采用有限元软件ABAQUS建立带连梁钢板剪力墙结构模型,结合国内外已有的典型试验结果验证数值方法的有效性。在此基础上,设计5个不同耦合度的低屈服点钢板剪力墙结构模型进行单调和循环加载,对比分析其损伤机制、承载性能及滞回耗能能力,探讨内嵌钢板与边缘框架的相互作用对结构及构件受力性能的影响,给出设计建议。结果表明:带连梁低屈服点钢板剪力墙结构内嵌钢板与边缘框架相互作用能够有效提高整体结构承载力、承载效率以及耗能能力。综合考虑材料利用率、承载能力及耗能能力,建议连梁耦合度控制在0.45以内。随着连梁耦合度的提高,边缘框架分担剪力多至60%,内部框架柱的轴力显著减小,连梁转角不断减小。因此,在带连梁低屈服点钢板剪力墙结构设计过程中应充分考虑内嵌钢板与边缘框架的相互作用,适当减小内嵌钢板设计厚度及边缘框架截面尺寸,提高材料利用率及设计经济性。同时,与纯框架抗侧性能相比,内嵌钢板与边缘框架的相互作用有效提高了边缘框架的初始抗侧刚度及承载力。

浅析高层建筑剪力墙中连梁结构中的设计

连梁是剪力墙结构体系中较为重要的一个结构,主要的作用就是耗能,保护建筑物不受到外力的损害,所以,连梁设计是需要加以重视的.

浅议高层建筑结构设计中连梁超筋的解决办法

本文针对在高层建筑结构设计中,对连梁出现超筋的情况进行分析、讨论提出相应的解决方法和建议,供有关设计人员参考。

小高层住宅短肢剪力墙结构设计分析与应用探讨

本文结合笔者多年结构设计实践,分析小高层住宅短肢剪力墙结构的具体特点与设计要领,并结合具体实例,对小高层住宅短肢剪力墙结构重点和连梁结构设计进行了深入探讨与总结,可供同行借鉴参考。

钢筋混凝土组合剪力墙的非弹性抗震性能研究

论述国内外在钢筋混凝土组合剪力墙抗震性能方面的研究成果,探索其中的不足之处,提出一些有待研究的关键问题,为今后是理论研究提供思路。

Influence of concrete differential aging time on the construction phases analysis of the Fenghua River Bridge

The Fenghua River Bridge is a major structure on the highway between Hengzhang and Guojiachi, which is to be built with a four-span prestress concrete (PC) box girder and symmetrical cantilever castings. In this paper, a finite element method (FEM) model is set up to study the effects of concrete differential aging time on the construction phases of the Fenghua River Bridge by calculating the vertical displacement of the folding segment of the middle span and the longitudinal bending moment of Pier 12#. In the model, the girders are classified into 150 changing sections based on the desgn scheme, and their construction is to be carried in 16 phases respectively to build 12 blocks connected by a side folding segment and a middle folding segment, covered with a second dead load and in completion for 20 years. It is found that the internal forces and deformations of the concrete structures at the aging time of 60 d are quite different from those of 0 d aging time while the behaviors of the structures of 120 d aging time is nearly the same as those of 60 d aging time― the differences are so small that can be neglected, suggesting that the creep develops obviously about one month after the cement is hardened and the development fades later on.

Identification of Connection Flexibility Effects Based on Load Testing of a Steel-Concrete Bridge

In the case of composite girders, an effective cooperation of both parts of the section is influenced by deformability of connectors. Limited flexural stiffness of welded studs, used commonly in bridge structures, does not provide full interaction of a steel beam and a concrete slab. This changes strain distribution in cross-sections of a composite girder and results in redistribution of internal forces in steel and concrete element. In the paper partial interaction index defined on the basis of a neutral axis position, which can be used for verification of steel-concrete interaction in real bridge structures rather than in specimens is proposed. The range of the index value changes, obtained during load testing of a typical steel-concrete composite beam bridge, is presented. The investigation was carried out on a motorway viaduct, consisting of two parallel structures. During the testing values of strains in girders under static and quasi-static loads were measured. The readings from the gauges were used to determine the index, characterizing composite action of the girders. Results of bridge testing under movable load, changing position along the bridge span is presented and obtained in-situ influence functions of strains and index values are commented in the paper.

Feasibility of developing composite action between concrete and cold-formed steel beam

Cold-formed steel structures are steel structure products constructed from sheets or coils using cold rolling, press brake or bending brake method. These structures are extensively employed in building construction industry due to their light mass, ductility by economic cold forming operations, favorable strength-to-mass ratio and other factors. The utilization of cold formed steel sections with concrete as composite can hugely reduce the construction cost. However, the use of cold formed steel members in composite concrete beams has been very limited. A comprehensive review of developments in composite beam with cold formed steel sections was introduced. It was revealed that employing cold-formed steel channel section to replace reinforcement bars in conventional reinforced concrete beam results in a significant cost reduction without reducing strength capacity. The use of composite beam consisting of cold-formed steel open or close box and filled concrete could also reduce construction cost. Lighter composite girder for bridges with cold-formed steel of U section was introduced. Moreover, types of shear connectors to provide composite action between cold-formed steel beam and concrete slab were presented. However, further studies to investigate the effects of metal decking on the behavior of composite beam with cold-formed steel section and introduction of ductile shear connectors were recommended.

关于高层建筑剪力墙的连梁设计的探究

连梁为剪力墙结构设计中重要部分,具有梁截面大、跨度小的有点,对提高建筑工程结构稳定性与安全性具有重要意义.

高层采光井提升式操作平台技术的应用

十里铺新村五号院工程为高层住宅项目,其外围防护结构采光井较多且在外平面位置有结构梁,全钢外架不能形成有效连接整体,经方案比较,在施工中应用采光井提升式操作平台技术,提出了平台关键部件的制作方法并进行了验证,在施工过程中采取了充分的安全措施,顺利高效地解决了相关施工难点,在保证外架防护安全的同时,也更好地体现了爬架的整体形象。