聂建国
钢-混凝土组合结构新体系和新技术的研发、以及组合结构基本性能、设计理论和计算方法及新型加固技术等领域
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水利工程
- 研究兴趣:钢-混凝土组合结构新体系和新技术的研发、以及组合结构基本性能、设计理论和计算方法及新型加固技术等领域
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聂建国, 朱红超, 罗玲, 周建军, 朱林森
建筑结构学报, 2002, 23(2):45~54,-0001,():
-1年11月30日
为研究钢-混凝土组合梁在不同加载方式下的受扭性能,完成了6根钢。混凝土组合粱的弯扭试验和纯扭试验,其中2根粱的扭矩直接作用于工字钢粱上,其余4根粱则由锕粱和混凝土翼绿板作为整体共同受扭。试验结果表明。当扭矩 直接作用于钢粱上时,混凝土翼缘板通过栓钉对钢粱的扭转提供约束,从而使钢粱的抗扭承载力比纯钢梁的提高2倍以上。在试验参数相同时,混凝土翼缘板和钢粱作为整体复合受扭时组合粱的开裂扭矩及极限抗扭承载力比扭矩直接作用于钢粱时的分别提高86%和39%。分析了两种不同加载方式下钢。混凝土组台粱受扭和受弯承载力的变化。建立了扭矩直接作用于钢梁上时极限扭矩的计算模型及计算公式。时整体受扭时组合粱的弯矩相关性进行了分析,并建立了相关曲线公式。计算结果与实测值吻合较好。
钢混凝土组合梁, 纯扭试验, 弯扭试验, 不同扭矩作用方式
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【期刊论文】Experimental Studies on Behavior of Composite Steel High-Strength Concrete Beams
聂建国, by Jianguo Nie, Yah Xiao, Ying Tan, and Hongquan Wang
ACI Structural Journal/March-April 2004,-0001,():
-1年11月30日
This paper describes an experimental study on behavior of steel and high-strengrth concrete (HSC) composite beams. Seven model HSC composite beams and one normal. strength concrete (NSC) beam were tested under monotonic loading. All beams were designed for a full shear connection between the steel beam and the concrete flange USing shear studs. It was identified that the HSC composite beams had higher initial stiffness and very distinct post. yielding characteristics compared wim the NSC beam. Test results of the HSC specimens also showed several favorabte design aspects such as a larger margin beyond the steel yielding and greater ultimate deformability. Analysis based on the current design codes can providea reasonable estimation to the flerural bzitial stiffness andul timate flexural capaci of the HSC composite beams.
high-strength concrete, moment, slip, yield strength.,
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聂建国, 樊健生, 王挺
土木工程学报,2002,35(1):15~20,-0001,():
-1年11月30日
为研究钢-混凝土组合梁在负弯矩作用下混凝土翼缘裂缝的发生和发展情况,对8根钢-压型钢板混凝土组合梁进行了试验研究,结果表明,影响组合梁裂缝的因素比较复杂,需要采取有效的措施加以控制。同时,结合试验和理论分析,进一步完善了钢-混凝土组合梁混凝土翼缘最小配筋率、开裂弯矩和最大裂缝宽度的计算方法,计算结果与实测值吻合良好。
组合梁, 压型钢板, 负弯矩, 裂缝
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聂建国, 田春雨
土木工程学报,2005,38(2):8~12,-0001,():
-1年11月30日
有端横梁约束的简支单向组合梁-板体系在横向荷载作用下,由于剪力连接件的约束,翼缘板中存在剪力滞后现象。结构体系中,端横梁对剪力滞后程度有很大影响。本文采用有限元方法,对翼缘有效宽度的主要影响因素进行参数分析,其中包括宽跨比、荷载类型、滑移刚度、端横梁约束程度等,并拟合出了各种情况下有效宽度的简化计算公式,通过与有限元方法及其它计算方法的对比,说明了本文公式的准确性。
单向组合梁-板体系, 端横梁约束, 翼缘有效宽度, 有限元分析
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【期刊论文】Steel-Concrete Composite Beams Considering Shear Slip Effects 100084, China.
聂建国, Jianguo Nie and C. S. Cai, P.E., M.ASCE
JOURNAL OF STRUCTURAL ENGINEERING ,-0001,():
-1年11月30日
The present study investigated the effects of shear slip on the deformation of steel-concrete composite beams. The equivalent rigidity of composite beams considering three different loading types was first derived based on equilibrium and curvature compatibility, from which a general formula to account for slip effects was then developed. The predicted results were compared with measurements of six specimens tested in the present study and other available test results for both simply supported and continuous beams. It was found that including slip effects has significantly improved the accuracy of prediction. For typical beams used in practice, shear slip in partial composite beams has a significant contribution to beam deformation. Even for full composite beams, slip effects may result in stiffness reduction up to 17% for short span beams. However, slip effects are ignored in many design specifications that use transformed section method except that American Institute of Steel Construction (AISC) specifications recommend a calculation procedure in the commentary. In the AISC procedure, stress and deflection calculations of partially composite girders are based on effective section modulus and moment of inertia to account for slip, while ignoring slip effects in full composite sections. For full composite sections, the effective section modulus and moment of inertia calculated with the AISC specifications are larger than that of present study, meaning that the specifications are not on the conservative side. For partial composite sections, the AISC predictions are more conservative than the present study.
Composite beams, Slip, Deformation.,
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【期刊论文】DEFLECTION OF CRACKED RC BEAMS UNDER SUSTAINED LOADING
聂建国, By Jianguo Nie and Chun S. Cai
JOURNAL OF STRUCTURAL ENGINEERING/JUNE 2000,-0001,():
-1年11月30日
An analytical model that incorporates time-dependent effects (creep and shrinkage) was developed to predict the long-term deflection of cracked reinforced concrete beams under sustained loading. The deflection model includes both bending and shear effects. Correspondingly, experimental studies were conducted to verify the analytical model. Eight specimens were precracked with a diagonal crack width of 0.2-0.3mm and tested under sustained loading for three months. It was found that the contribution of shear effect to long-term deflection is significant. The predicted deflections including both bending and shear deformations agree very well with experimental measurements. In addition, formulas for calculating creep coefficients from strain increments were derived that provide an approach to calibrating the code specifications. The effects of different creep coefficients on the prediction of time-dependent deformations were discussed.
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【期刊论文】Stiffness and Deflection of Steel-Concrete Composite Beams under Negative Bending
聂建国, Jianguo Nie ; Jiansheng Fan ; and C. S. Cai
JOURNAL OF STRUCTURAL ENGINEERING ,-0001,():
-1年11月30日
Compared with simply supported beams, continuous steel-concrete composite beams have many advantages such as higher span/depth ratio, less deflection, and higher fundamental frequency of vibration due to its higher stiffness. However, in negative bending regions near interior supports, tension in concrete is unfavorable and a complicated issue, which deserves a special study. In this paper, a mechanics model based on elastic theory was established to investigate the stiffness of composite beams in negative bending regions by considering slips at the steel beam-concrete slab interface and concrete-reinforcement interface. In order to validate this approach, a test of three composite beams with profiled sheeting under negative bending was conducted. Meanwhile, a three-dimensional nonlinear finite element (FE) analysis was conducted to investigate the general behavior of the tested specimens. In addition, a comparative analysis between results derived from the analytical model, laboratory test, and FE analysis was performed. The results show that slip always exists for composite beams under negative bending even with complete shear connection (full composite action) between the steel and concrete components. The slip effect results in an additional curvature of beam bending and reduces the section stiffness by 10-20% compared with that of a beam without any slip in serviceability condition. This reduction should be considered in designing process especially for cantilever beams. Formulae under other loading cases and boundary conditions were also proposed. The results can serve as a basis for further study on stiffness of continuous steel-concrete composite beams and can directly be used for the deflection calculation of cantilever beams.
Bridges,, girder, Deformation, Stiffness, Slip, Studs, Composite beams, Bending.,
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【期刊论文】Experimental Studies on Shear Strength of Steel-Concrete Composite Beams
聂建国, Jianguo Nie ; Yan Xiao ; and Lin Chen
JOURNAL OF STRUCTURAL ENGINEERING ,-0001,():
-1年11月30日
Static loading tests were conducted on 16 steel-concrete composite beams and two steel beams to investigate shear resisting mechanisms and the strength of composite beams. The main experimental parameters were the shear span aspect ratio of the simply supported beams, and the width and thickness of the concrete flanges. Based on strain measurements, stress in the steel beam was analyzed using theories of elasticity and plasticity, and the vertical shear that the steel beam resisted was calculated. The shear resistance of the concrete flange was then obtained by subtracting the steel shear contribution from the total load applied. It was found that the concrete flange could sustain 33-56% of the total ultimate shear applied to the composite beam specimens, contrary to the typical assumption of neglecting the concrete shear contribution in most design codes and specifications. A shear strength equation that considers the shear contributions of both the steel beam and the concrete flange is proposed.
Composite beams, Steel, Concrete, Shear strength, Ultimate strength, Yield.,
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聂建国
建筑结构,1997(1):42~44,-0001,():
-1年11月30日
对钢-混凝土组合梁的长期变形问题进行了分析和讨论。指出我国现行(钢结构设计规范)关于组台梁长期变形的计算值偏小。并建立了组合梁的长期剐度计算公式。反映了混凝土徐变系数大小的影响。同时还考虑了混凝土收缩对变形的影响。公式意义明确。形式简单,应用方便。
钢-混凝土, 组合梁, 长期变形, 徐变, 收缩
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聂建国, , 孙彤, 温凌燕, 刘静
建筑结构学报,2004,25(6):123~125,-0001,():
-1年11月30日
本文结合某会展中心的大跨楼盖结构设计,介绍了大跨交叉钢-混凝土组合梁系楼盖的主要设计思路及构造方法,并介绍了复杂节点的构造措施。通过跨高比、用钢量等技术指标说明应用大跨交叉钢-混凝土组合梁系楼盖具有显著的技术经济效益。工程实践表明,这种大跨楼盖结构应用前景广阔。
大跨交叉钢-混凝土组合梁系楼盖, 工程实践, 技术经济指标
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