T型短肢剪力墙平截面假定的分析

取不同肢厚比设计了4个不同的构件,以一定的轴压比,应用有限元程序ANSYS分析了T型截面柱在水平单调荷载作用下的平截面假定的适用性,提出进一步改善的措施。     

钢筋混凝土T形柱最不利荷载角的研究

探讨钢筋混凝土T形柱最不利荷载角及其影响因素.利用编制的钢筋混凝土异形柱截面全过程数值分析程序,通过对多种工况下钢筋混凝土异形柱正截面承载力的计算分析,结果表明异形柱最不利荷载角的影响因素主要是轴压比;截面尺寸对最不利荷载角有些影响;而混凝土强度、纵筋配筋面积对最不利荷载角的影响很弱.研究结果为钢筋混凝土异形柱的设计和异形柱的可靠性分析提供参考依据.     

厦门某超限高层框－筒结构抗震设计

以厦门某国际广场超限高层框架核心筒结构抗震设计为例,采用SATWE进行了3种墙柱截面设计方案的比选,用SATWE和PMSAP两种软件对所选方案在水平荷载作用下进行了计算和对比分析,两软件计算结果基本吻合,分析结果表明,所选方案满足规范要求。     

三维钢桁架桥静力理论模型与试验分析

设计了三维钢桁架桥模型并进行静力试验分析,同时采用Matlab软件编制程序建立三维钢桁架桥静力有限元模型,按照试验静力加载工况对有限元模型进行加载分析。分析不同的单元类型、边界条件、截面尺寸对结果的影响,并与试验结果进行比较。结果表明,在垂直荷载作用下,采用杆单元和梁单元计算的位移结果都比较接近,模型采用铰接的计算结果比固结大,单肢角钢的模型刚度是双肢角钢的模型刚度的50%。理论模型在固结、双肢角钢条件下与试验结果接近。     

型钢混凝土T形柱基于ABAQUS抗扭力学性能分析

因为异形柱经常承受偏心受压加受扭的复杂受力,所以理论计算比较复杂。本研究使用有限元分析软件ABAQUS对T形截面型钢混凝土柱的抗扭性能进行了数值模拟分析,并考虑混凝土塑性发展探讨不同轴压比与钢骨率对型钢混凝土T形截面柱延性与抗扭承载力的影响。利用已有的实验数据,建立构件的受压有限元模型,通过对比荷载-位移曲线验证有限元材料本构的有效性。建立三组模型分析不同轴压比与钢骨率对构件抗扭力学性能的影响,为今后型钢混凝土异形柱的应用提供参考。     

低周反复荷载下钢筋增强ECC/混凝土组合柱抗震性能（英文）

为提高柱的抗震性能,采用高延性纤维增强水泥基复合材料(ECC)部分代替钢筋混凝土柱底部的混凝土得到ECC/RC组合柱.采用MSC.MARC有限元软件分析了组合柱在低周反复荷载作用下的受力性能.分析发现采用ECC/RC组合柱能够显著提高柱的承载力、延性和耗能能力.然后探究了ECC高度、轴压比和纵筋配筋率3个参数对ECC/RC组合柱抗震性能的影响.结果表明:ECC高度在0.8h(h为截面高度)左右的组合柱近似可以达到全ECC柱的抗震性能;随着轴压比的增加,组合柱的承载力增加,而延性下降;在适当配筋的范围内,提高配筋率可以提高组合柱的延性和耗能能力,对承载力几乎无影响.分析结果对于ECC结构设计具有一定的指导意义和参考价值.     

钢管混凝土双肢格构墩梁桥抗震优化设计

以黄桷湾特大桥为工程背景,选取轴压比、梁墩刚度比、系梁布置形式及柱肢混凝土强度等级为设计参数,应用Midas Civil有限元软件构造了20座三跨对称桥梁计算模型。研究E1地震作用下钢管混凝土双肢格构墩连续梁桥主要控制截面参数地震响应,探讨各设计参数对钢管混凝土双肢格构墩连续梁桥抗震性能的影响规律,并对全桥进行优化验证。研究结果表明:轴压比对地震作用下结构内力和位移有一定影响,建议控制在0.15~0.25;梁墩刚度比对结构的抗震性能影响较大,控制在4.08~10.90时结构的内力分布更加合理;核心混凝土的强度在C40~C50时取值较为合理。     

题目：圆形纤维增强塑料缠绕混凝土柱在持续轴向压缩下的面向设计的模型分析

目的：在实际工程服役过程中,纤维增强塑料（FRP）约束混凝土柱在遭遇极限荷载前往往已经经历了长时间的轴压荷载作用。因此,相比其短期力学性能,本文旨在研究FPR约束混凝土柱在长期荷载作用后的力学性能。创新点：1.考虑长期轴压荷载作用,提出一种轴压作用下圆形截面 FRP 约束混凝土柱的长期变形分析模型;2.提出了长期轴压作用后的FRP约束混凝土本构模型,从本构关系的角度描述两个方面的影响机理。方法：运用混凝土和FRP徐变的长期变形分析迭代计算方法（图3）。结论：1.提出的长期变形分析模型实现了对FRP约束混凝土柱任意目标时刻的应力和应变状态的高效、准确预测;2.将提出的本构模型嵌入有限元软件中,有效地实现对长期轴压作用的考虑;3.基于OpenSees有限元软件,验证了长期变形分析模型和本构模型的有效性和准确性。     

长期荷载作用下圆端形钢管混凝土力学性能

采用有限元法,全过程分析了考虑长期荷载作用下时构件的应变-荷载曲线。基于有限元模型,分析了长期荷载作用下圆端形钢管混凝土柱的工作机理。结果表明:考虑长期荷载作用影响对圆端形钢管混凝土柱的内力分布、变形有较大影响,对承载力影响不大,且随着高宽比的增大,构件的峰值荷载增大,延性减小。     

冷轧带肋钢筋作箍筋对高强混凝土柱延性的影响

本文采用低强箍筋和高强箍筋的对比试验,对高强混凝上压弯构件进行了在反复荷载作用下的试验,得到了各试件的荷载-位移府回曲线,通过对荷载-位移滞回曲线、位移延性系数等的分析,研究了冷轧带肋钢筋作箍筋对高强混凝土柱延性的影响试验表明：高轴压比下的高强混凝土柱在高强度箍筋─—冷轧带肋钢筋、高配箍率下能获得很好的延性．     

T形、十字形截面柱翼缘对轴压比限值影响的讨论

从异形柱大、小偏心界限破坏条件出发,导出了T形、十字形截面柱轴压比设计值的计算公式,讨论了翼缘对轴压比限值的影响,并给出了T形、十字形柱轴压比设计值取值的建议。     

Mechanical Behavior of Rectangular Steel-Reinforced ECC/Concrete Composite Column under Eccentric Compression

In order to improve the seismic performance, deformation ability and ultimate load-carrying capacity of columns with rectangular cross section, engineered cementitious composite(ECC) is introduced to partially substitute concrete in the edge zone of reinforced concrete columns and form reinforced ECC/concrete composite columns.Firstly, based on the assumption of plane remaining plane and the simplified constitutive models, the calculation method of the load-carrying capacity of reinforced ECC/concrete columns is proposed. The stress and strain distributions and crack propagation of the composite columns in different states of eccentric compressive loading are analyzed. Then, nonlinear finite element analysis is conducted to study the mechanical performance of reinforced ECC/concrete composite columns with rectangular cross section. It is found that the simulation results are in good agreement with the theoretical results, indicating that the proposed method for calculating the load-carrying capacity of concrete/ECC composite columns is valid. Finally, based on the proposed method, the effects of ECC thickness, compressive strength of concrete and longitudinal reinforcement ratio on the mechanical performance of reinforced ECC/ concrete composite columns are analyzed. Calculation results indicate that increasing the thickness of ECC layer or longitudinal reinforcement ratio can effectively increase the ultimate load-carrying capacity of the composite column with both small and large eccentricity, but increasing the strength of concrete can only increase the ultimate loadcarrying capacity of the composite column with small eccentricity.     

钢筋砼L-形截面双向拉弯构件正截面承载力的研究

对钢筋砼 L-形截面双向拉弯构件的正截面承载力进行了研究 ,还对三根钢筋砼 L-形截面双向拉弯构件进行了试验研究 .编制了计算机程序 ,可用于各种类型截面的计算 ;并用此程序对 L-形截面在双向拉弯作用下的 N- M相关曲线、等轴力下的 Mx- My相关曲线进行了计算分析 ,理论计算结果与试验结果吻合较好     

Analysis and behaviour of FRP-confined short concrete columns subjected to eccentric loading

Fibre-reinforced polymer （FRP） composites were widely utilized in civil engineering structures as the retrofit of reinforced concrete （RC） columns. To design FRP jackets safely and economically, the behaviour of such columns should be predicted first. This paper is concerned with the analysis and behaviour of FRP-confined RC circular and rectangular short columns subjected to eccentric loading. A simple design-oriented stress-strain model for FRP-confined concrete in a section analysis was first proposed. The accuracy was then proved by two test data. Following that, a parametric study including amount of FRP confinement, FRP strain capacity, unconfined concrete strength and shape of column section is provided. Some conclusions were obtained at the end of the paper. The work here will provide a comprehensive understanding of the behaviour of FRP-confined concrete columns. The simplicity of the model also enables a simple equivalent stress block to be developed for direct use in practical design.     

T形配钢型钢混凝土偏压构件力学性能研究

建立了T形配钢型钢混凝土偏压构件力学性能分析的有限元模型,计算结果得到以往实验结果的验证。在此基础上,分析了不同阶段材料应力状态和各参数对偏压构件力学性能的影响。结果表明:T形配钢型钢混凝土构件在不同加载角下的性能有所不同,加载角为180°时极限承载力大于其他角度情况;混凝土抗压强度、型钢含钢率、配筋率、荷载偏心率、长细比对构件荷载-变形曲线的影响较大,随着混凝土强度、型钢含钢率、配筋率的增加,极限承载力和刚度增加;随着荷载偏心率的增加,极限承载力和刚度下降;随着构件长细比的增加,构件承载力总体呈现线性下降趋势,刚度下降明显。     

FRP加固RC圆柱正截面受弯承载力计算（英文）

运用数值计算方法对FRP加固钢筋混凝土（RC）圆柱截面特性进行计算,发现截面破坏时受压区高度主要受轴压比、FRP约束强度比和纵筋配筋特征值3个主要参数影响.根据数值计算的结果进行回归,提出了受压区对应圆心角θ的计算方法.数值计算结果显示,横向约束导致的混凝土应力提高以及纵筋屈服后的强化效应使RC柱破坏时截面受弯承载力远大于规范规定值.根据理论分析和36个大比例试件实测结果提出截面破坏时受弯承载力计算方法,计算结果与试验结果吻合很好.最后,对一个典型柱变形能力进行参数分析,研究轴压比,纵筋配筋特征值和FRP约束强度比对正截面变弯承载力的影响.结果显示FRP加固圆柱破坏时受弯承载力可以比规范规定的未加固柱受弯承载力提高50%左右.     

轻骨料混凝土圆形截面偏心受压构件正截面承载力的理论分析

根据轻骨料混凝土材料非线性的应力－应变关系，采用非线性分析的方法，对圆形截面的钢筋轻骨料混凝土偏心受压构件的正截面承载力做了全过程理论分析，建立了圆形截面偏心受压构件正截面承载力数值迭代的基本方程，同时也为简化计算方法提供了理论依据。     

异形柱框架结构的弹塑性时程分析

应用大型有限元分析软件ANSYS,对钢筋混凝土异形柱框架结构进行动力特性和弹塑性时程分析。得到钢筋混凝土异形柱框架结构的自振频率、振型特点,以及异形柱框架结构在8度抗震设防情况下顶层水平位移时程曲线、顶层加速度时程曲线、水平位移沿楼层高度分布曲线及层间位移角沿楼层高度变化曲线。研究了底层层高和结构高度等对异形柱框架结构地震反应的影响。     

Numerical Determination of Shear Strength of Steel Reinforced Concrete Column Strengthened by CFRP Sheets

The earthquake-resistant property of reinforced concrete members depends on the interaction between reinforcing bars and surrounding concrete through bond to a large degree,In this paper a general system aimed at dealing with the failure analysis of reinforced concrete columns strengthened with carbon-fiber-reinforced plastic(CFRP) sheets including bond-slip of the anchored reinforcing bars at the foot of the columns is presented.It is based on the yield design theory with a mixed modeling of the structue,according to which the concrete material is treated as a classical two-dimensional continuum ,whereas the longitudinal reinfocing bars are regarded as one-dimensional rods including bond-slip at the foot of the columns,In shear reinforced zones both the shear CFRP sheets and transvers reinforcing bars are incorporated in the analysis throuth a homogenization procedure and they are only in tesion ,The approach is then implemented numerically by means of the finite-element formulation,The numerical procedure produces accurate estimates for the loading-carrying capactiy of the shear members taken as an illustrative application by correlation with the experimental results,so the proposed approach is valid.     

Unified expression for failure of reinforced concrete members in bridge

INTRODUCTION Reinforced concrete elements with box section are commonly used in horizontal subsystems and in vertical support of bridge structures. The horizontal structural members normally have box section and top flange. The vertical supports of the bridge usually have a box section also. To simplify the deduction of such structural member under combined forces, the box sections without top flange are discussed here. Fig.1 shows the typical section types of reinforced concrete members.…