混凝土柱钢梁连接节点设计

介绍了钢结构夹层钢梁与混凝土柱连接节点做法,提出了刚性节点和铰接节点的设计方法及节点做法。     

钢管混凝土柱与钢筋混凝土梁连接节点设计

本文推荐一种钢管混凝土柱与钢筋混凝土粱节点做法,使钢管在节点区是连续的,节点刚性不受影响,粱可以可靠地传递内力,与其它节点做法相比,具有施工方便和节约材料的优点。     

对混凝土柱钢梁连接节点设计的探讨

钢结构夹层设计在大型公建工程中经常被应用到,文章介绍了钢结构夹层钢梁与混凝土柱连接节点做法,提出了刚性节点和铰接节点的设计方法及节点做法。     

钢管混凝土柱-钢梁连接节点形式与研究进展

钢管混凝土结构体系中,梁柱节点的受力状态复杂,是结构体系中的关键连接部位,对结构的承载力、刚度以及稳定性能均有重要影响。对国内外钢管混凝土柱-钢梁连接节点的相关研究进行了全面的综述,总结了内加强型连接节点、外加强型连接节点、贯通式连接节点、螺栓连接节点等各类钢管混凝土柱-钢梁连接节点形式的特点和已有研究,从承载力、刚度、破坏模式、抗震性能、设计方法等方面对各类连接节点的优势和存在的问题进行了分析和归纳。旨在为钢管混凝土柱-钢梁连接节点的相关研究提供参考,促进钢管混凝土柱结构体系的研究和工程应用。     

矩管混凝土柱H型钢梁新型连接节点抗震性能研究

通过对所提出的方钢管混凝土柱H型钢梁楔形箱型节点进行抗震性能研究,利用ABAQUS分析了矩管柱的宽厚比、混凝土强度以及轴压比对节点滞回性能的影响。结果表明:影响节点受力性能的主要因素是矩管的宽厚比,在一定范围内提高矩管厚度会提高节点的承载能力和刚度。同时给出了矩管混凝土柱H型钢梁楔形箱型节点抗剪承载力简化计算式。     

浅谈钢骨混凝土结构的节点设计——柱与柱的连接、柱脚及拼接

1 柱与柱的连接 在实际施工和生产中当结构下部采用钢骨混凝土柱、上部采用钢柱或钢筋混凝土柱时,规程规定要设过渡层.     

装配式钢管混凝土柱与梁节点连接构造

对装配式钢管混凝土梁柱节点连接进行分类,从构造做法和受力特点两方面,详细介绍了圆钢管混凝土柱—梁节点和方钢管混凝土柱—钢梁节点,从而为工程设计人员提供参考。     

钢骨混凝土十字形柱-钢梁连接节点的数值分析

蜂窝状钢骨混凝土异形柱框架体系是一种很适合于当今钢结构住宅建筑的新型结构体系,其梁柱节点是这一结构体系的关键部位之一。为了探讨蜂窝状钢骨混凝土十字形柱-钢梁连接节点的受力性能与变形特性,文章运用ANSYS有限元分析软件,分析轴压比、配箍率、混凝土强度、型钢强度、节点域型钢腹板高厚比、钢骨腹板开孔至节点域横向加劲肋间的距离等主要参数对节点承载力的影响及其规律,并给出了该类节点承载力计算公式中相应参数的合理取值与设计建议,可为后续研究和工程应用提供参考。     

薄壁方钢管混凝土柱与钢梁不同连接节点承载性能研究

本文进行了8个薄壁方钢管混凝土柱与薄壁方钢管梁连接节点缩尺模型的拟静力试验和采用约束本构模型(考虑钢管对混凝土的套箍系数)的数值模拟,即梁柱直接焊接节点和梁柱加腋节点。比较了这两类节点在不同轴压比下的破坏模式、滞回曲线、承载能力和耗能能力。试验和数值模拟结果表明:①节点破坏现象大多发生在节点域柱壁撕裂和梁壁鼓曲并产生塑性铰,梁柱加腋节点的整体承载性能优于直接焊接节点;②数值模拟方法能很好地预测节点的滞回性能,加腋板能提高节点的承载力和累积耗能能力,使节点满足"强柱弱梁,节点更强"的抗震设防要求。加腋节点承载性能和数值模拟方法可以为该类节点的工程应用和进一步研究提供参考。     

方钢管混凝土柱-焊接腹板削弱钢梁节点选型及设计

根据钢框架强柱弱梁、强节点弱构件的抗震设计原则,常采用削弱梁将梁端塑性铰外移至削弱区域。本文采用三维非线性有限元分析腹板开孔的削弱梁形式,并和传统的狗骨式节点（RBs）受力性能进行对比,通过各种节点的承载力与应力分布情况比较提出两种有效的梁腹板削弱构造形式（腹板开圆孔和长圆孔）,并且参照国家规范给出了此类节点的设计建议方法。     

型钢再生混凝土柱-钢梁组合框架节点受力性能非线性分析

在型钢再生混凝土柱-钢梁组合框架节点拟静力试验基础上,采用ABAQUS有限元软件建立了组合框架节点的数值计算模型,对该组合框架节点在水平荷载作用下的受力非线性行为进行了有限元分析,获取了组合框架节点的破坏过程、破坏形态、应力云图、荷载-位移曲线及荷载特征值,并对节点的承载力计算值与试验值进行了比较,验证了有限元计算模型...     

大跨度型钢混凝土梁板屋盖设计

根据建筑结构设计的相关规范,结合具体的工程实际,对大跨度混凝土结构屋盖的设计进行了探讨,同时对大跨度型钢混凝土梁设计的相关问题进行了讨论,工程实践表明利用混凝土中加入型钢钢材对于降低梁截面高度和提高梁刚度具有明显的作用。     

Design equation for predicting fire resistance of reinforced concrete beams

An approach for evaluating the fire resistance of reinforced concrete (RC) beams is presented in this paper. A macroscopic finite element model is applied to study the influence of various parameters on the fire resistance of RC beams. Data from parametric studies is utilized to develop a simplified expression for evaluating the fire resistance of an RC beam as a function of influencing parameters. The validity of the proposed approach is established by comparing the fire resistance predictions with those obtained from finite element studies as well as from fire resistance tests. Predictions from the proposed equation are also compared with fire resistance estimates from current codes of practice. The applicability of the approach to design situations is illustrated through a numerical example. The proposed rational approach expresses fire resistance in terms of conventional structural and material design parameters, and thus facilitates easy evaluation of fire resistance. The proposed approach provides better estimates than those from current codes of practice and thus can be used to evaluate the fire resistance of RC beams with an accuracy that is adequate for design purposes.     

Reliability evaluation of reinforced concrete beams

The purpose of this paper is to evaluate the time-invariant reliability of reinforced concrete beams designed under the provisions of the ACI Building Code. A wide range of practical design situations is considered. The beams are subjected to bending, shear, and torsion. The interaction between shear and torsion is considered via an elliptical failure surface defined in the shear-torsion stress space. No interaction is assumed between flexural resistance and resistance in both shear and torsion. Representative statistics and appropriate probability distributions of the basic resistance and load variables are selected from previous related work. The reliability analysis is performed using modern reliability methods, in which the formulation of the limit-state functions is consistent with the underlying design criteria. Reliability indices for various failure modes are compared and a system reliability analysis is performed to include all failure modes. It is found that the reliability indices are most sensitive to live load, model uncertainties, and material strengths. For the failure modes considered, the reliability indices are found to be rather insensitive to design parameter values, indicating that the ACI Building Code achieves its desired objective of uniform reliability across a wide range of design situations.     

Shear failure of reinforced concrete beams

It has been suggested in a previous work that the causes of shear failure exhibited by reinforced concrete (RC) beams are associated with the stress conditions in the region of the path along which the compressive force is transmitted from support to support. The work described in this paper presents experimental evidence supporting the above concept. The work is based on a comparative study of the behaviour of concrete beams reinforced in compliance with this concept and that of beams reinforced in compliance with current design procedures.     

预应力碳纤维加固钢筋混凝土梁试验研究

通过试验研究了预应力碳纤维加固钢筋混凝土梁对其承载力、变形等方面的影响，论证了预应力碳纤维加固法的可行性，指明了这种方法尤其适用于大跨度的受弯构件。     

锈蚀钢筋混凝土梁抗弯性能研究

通过对24根不同锈蚀率的钢筋伸长率、屈服强度和极限强度的变化规律的介绍,分析了8根不同锈蚀率的钢筋混凝土梁抗弯承载能力和延性,描述了锈蚀钢筋混凝土应力—应变关系,应力—位移关系和强度变化规律,并通过试验得出了一些有益的结论。     

碳纤维布加固梁的计算

通过对预应力碳纤维布加固钢筋混凝土梁的受力过程进行分析,结合我国现行规范,假定加固梁的截面应变符合平截面假定,通过截面极限状态分析,分别提出了界限破坏、受压破坏和受拉破坏模式下受弯承载力的理论计算公式。     

Creep behaviour of CFRP-strengthened reinforced concrete beams

The strengthening of reinforced concrete structures with externally bonded fibre reinforced polymer (FRP) laminates has shown excellent performance and, as a result, this technology is rapidly replacing steel plate bonding techniques. The numerous studies that have been carried out to date on FRP-strengthened concrete elements have mainly focussed on the static and short-term responses; very little work has been done regarding the long-term performance. This paper addresses this issue, and presents results from a series of experiments on the time-dependent behaviour of carbon FRP-strengthened concrete beams. Twenty-six reinforced concrete beams with dimensions 100 × 150 × 1800 mm, with and without bonded CFRP laminates, were investigated for their creep behaviour. Different reinforcement ratios were used to evaluate the contribution of the external reinforcement on the creep resistance of the beams. High levels of sustained load were used in order to determine the maximum sustained load that can be applied without any risk of creep failure. The applied sustained loads varied from 59% to 78% of the ultimate static capacities of the un-strengthened beams. For most of the long-term tests, the applied sustained loads were higher than the service loads. This was done to account for the fact that strengthening is typically required when a structure is expected to carry increased service loads. The main parameters of this study were (i) the level of sustained load and (ii) the strengthening scheme. The results confirm that FRP strengthening is effective for increasing the ultimate capacities of the beams; however, there is virtually no improvement in performance with regard to the long-term deflections.     

Structural behaviour of babadua reinforced concrete beams

The strength and deformation characteristics of concrete beams reinforced with babadua bars ranging from 2.87 to 12.13% were examined from tests performed on the beams. The beams were tested to failure mostly under third-point loading. Collapse of the beams occurred mostly through either flexural failure of concrete in compression or diagonal tension failure. The experimental failure loads averaged, respectively, 6.40 and 2.62 times the theoretical flexural strength and theoretical shear strength of the unreinforced concrete section. Also, the experimental failure loads were only approximately 1.18 times the theoretical flexural strength of the reinforced concrete and 1.05 times the theoretical shear strength of the concrete sections taking into consideration the resistance of the tension reinforcement.