Dual scaling damage model associated with weak singularity for macroscopic crack possessing a micro/mesoscopic notch tip
作者：
Sih, GC* ;Tang, XS
期刊：
Theoretical and Applied Fracture Mechanics ,2004年42(1):1-24 ISSN：0167-8442
通讯作者：
Sih, GC
作者机构：
E China Univ Sci & Technol, Sch Mech Engn, Shanghai 200237, Peoples R China.;Lehigh Univ, Dept Mech Engn & Mech, Bethlehem, PA 18015 USA.;Changsha Univ Sci & Technol, Sch Bridge & Struct Engn, Changsha 410076, Hunan, Peoples R China.;[Sih, GC] E China Univ Sci & Technol, Sch Mech Engn, Mail Box 295,130 Melong St, Shanghai 200237, Peoples R China.
通讯机构：
[Sih, GC] E;E China Univ Sci & Technol, Sch Mech Engn, Mail Box 295,130 Melong St, Shanghai 200237, Peoples R China.
关键词：
singularity representations;macro- and meso/micro-damage;crack-like defects;shifting of size scales;system inhomogeneity;transitional states;evolution of material damage;ENERGY DENSITY
摘要：
Multi-scale damage of material has been a concern in recent times owing to emphases of making devices in sizes smaller and smaller until the bulk average of the macroscopic material properties are no longer adequate while particle physics still lacks the expediency of engineering applications. There is the mesoscopic range between the microscopic and macroscopic size scale where the functional well being of engineering products must be addressed in terms of material damage. By in large, the only successful model developed during the early l960s and used up to now has been that of linear elastic fracture mechanics based on the concept of a single dominant macroscopic crack. There are apparent reasons still not understood why the simple model works so well while the refined theories, non-linear or otherwise, of the past half century or more have made insignificant contributions;they have been a disappointment, to say the least. There are signs to revive the atomistic models that have been attempted previously. The efforts were short lasted mainly because of the inability to connect the results with those at the macroscopic scale. It is not so much of the difference in size scale as the contrasting views of the particulate and continuum, a unsettled debate since the days of Aristotle and earlier. What ever it takes, it does appear that there is a need to extend the size scale of applicability for a given formulation where self-consistency is observed. With this in mind, the weak singularity approach is attempted in this work even for no better reasons other than being more satisfying than the piece meal empirical approach. One of the main objectives of this work is to describe the macroscopic and microscopic material damage ahead of a crack covering three to four orders of magnitudes of size effects in a single formulation that satisfies the continuum mechanics axioms with consistency. This includes the continuity of the crack opening displacements from the macro-scale to the micro-scale. More specifically, a micro-notch tip that can vary in shape and hence singularity prevails at the front of the macro-crack. The macro-to-micro geometric continuity provides not only the interacting effects for two scale levels but also a clue of the conditions under which cross scaling effects should be considered. Micro-crack blunting tends to elevate the macroscopic energy density field following a translational shift of the curves while the same effect at the tends to decrease the microscopic energy density field following a rotational shift of the curves. This behavior is shown to hold for both the symmetric and skew-symmetric loadings. The former refers to in-plane extension and latter to in-plane shear. Hence, the way with which material inhomogeneity affects crack tip behavior is not a simple matter of being close or far away from the site of potential failure. The combined effects of load, geometry and material will all contribute. More specifically, the stress state ahead of the main crack is found to be hydrostatic at the macroscopic scale but no so at the microscopic scale where the x- and y-component of the local normal stresses are not the same. This is because the micro-notch tip shape in this model can change shape. When the applied remote stress is in-plane shear, both the macroscopic and microscopic stress state near the main crack is hydrostatic. This implies that micro-cracking ahead of the main crack is more likely to occur under remote applied shear than remote applied normal stress, a result that has not been found or explained previously by analytical means. Hence, it might be useful for the practitioners to establish some rules of thumb in making decisions. The translational and rotational shifts of the energy density levels caused by different degree of micro-defect blunting can also serve a useful purpose for the development of new materials when considering the shapes of micro-defects in fabrication processes. The present approach of singularity representation emphases the need to put more weight on the influence of defect geometry such that non-linearity of constitutive relations can be relaxed as their emphases seem to have exceeded the contribution they are capable of offering. ©2004 Elsevier Ltd. All rights reserved.
语种：
英文
展开
柔性群桩与地基相互作用的非线性分析
作者：
刘杰;周德泉;赵明华
期刊：
土木工程学报 ,2004年37(12):55-61 ISSN：1000-131X
作者机构：
[刘杰; 赵明华] 湖南大学土木工程学院;株洲工学院土木工程系;[周德泉] 长沙理工大学岩土工程研究所
关键词：
柔性群桩;非线性分析;刚性承台;复合地基;桩土相互作用
摘要：
对桩侧土采用非线性荷载传递函数 ,桩端土采用线性荷载传递函数 ,同时考虑桩周土所分担的荷载对桩基荷载传递规律的影响 ,首次将增量荷载传递矩阵法与微分方程的近似解法———子域法相结合 ,推出了刚性承台下柔性群桩与地基非线性相互作用的系列近似解析算式。得出了如下结论 :刚性承台下 ,中桩、承台边缘桩及角桩的桩侧摩阻力沿深度的分布规律不完全相同 ,且各桩侧摩阻力发挥的程度也不一样 ,角桩侧摩阻力发挥最大 ,边中桩次之 ,中桩侧摩阻力发挥最小。
语种：
中文
展开
三元和四元复合地基工程特性的对比试验研究
作者：
周德泉;刘宏利;张可能
期刊：
建筑结构学报 ,2004年25(5):124-封三 ISSN：1000-6869
作者机构：
[刘宏利; 周德泉] 长沙理工大学;[张可能] 中南大学
关键词：
地基基础;三元和四元复合地基
摘要：
多元复合地基具有较好的技术效果和经济效益,但目前尚无比较成熟的分析方法供设计和检测使用.在桩、土顶部安装压力盒(计)和传感器,对三元和四元复合地基进行静载试验研究,结果表明:复合地基中桩、土应力随总荷载加大而增长,增长率与强度或相对刚度成正比;不同的桩、土应力增长率使桩体分担荷载比和桩土应力比随总荷载的变化规律有较大差别;两种复合地基的p-s曲线均呈缓变型,可用双曲线法模拟,便于建立破坏标准、获得切线模量;受压后,桩间土先达到塑性状态,大部分荷载增量由桩体承受,总效应是变形增大,故三元和四元复合地基宜按变形控制设计.本文结果可供进一步的理论研究和工程设计参考.
语种：
中文
展开
Technicians...Are You Ready for the Future of Pharmacy??
作者：
Gary R Smith
期刊：
Journal of Pharmacy Technology ,2004年20(5):308-0 ISSN：8755-1225
作者机构：
Changsha Univ Sci & Technol, Sch Bridge & Struct Engn, Changsha 410076, Hunan, Peoples R China
摘要：
Well technicians, the twenty-first century is here. In the last decade, many technicians have been working to improve the communication lines between the Technician Executive Committee and the California Society of Health-System Pharmacists (CSHP) technician membership. Articles have been written attempting to demystify the committee process so that all technician members would have a greater understanding of the role the committee has in working with you, the members. While some ideas have worked, some have not. It is imperative that all technician members gain an understanding of the professional organizational process-to learn it, embrace it, and work with it-and to improve yourself professional-ly.
语种：
英文
展开
轴对称脱层圆板的后屈曲分析
作者：
陈得良;傅衣铭
期刊：
湖南大学学报(自然科学版) ,2004年31(4):106-112 ISSN：1674-2974
作者机构：
[陈得良; 傅衣铭] 湖南大学
关键词：
脱层;轴对称;层合圆板;正交配点法;屈曲;后屈曲
摘要：
基于Von Karman板理论,考虑横向剪切变形,建立了轴对称脱层圆板的后屈曲控制方程.应用正交配点法,将轴对称脱层圆板的后屈曲控制方程、边界条件、以及联接条 件转化为非线性方程组,然后进行迭代求解.讨论了不同脱层深度和脱层半径对屈曲及后屈曲特性的影响,发现脱层屈曲荷载随着脱层深度的减小和脱层半径的增大而减小,后屈曲模态也表现出不同的形式.最后与有关文献的结果进行了比较,二者相当吻合.
语种：
中文
展开
基坑工程信息化施工
作者：
刘辉;周德泉
期刊：
西部探矿工程 ,2004年16(8):48-49 ISSN：1004-5716
作者机构：
长沙理工大学岩土工程研究所,湖南,长沙,410007;[刘辉; 周德泉] 长沙理工大学
关键词：
信息化施工;监测;预警值
摘要：
在深基坑施工过程中,只有对基坑支护结构、基坑周围的土体和相邻的构筑物进行全面系统的监测,才能对基坑工程的安全性和对周围环境的影响程度有全面的了解,以确保工程的顺利进行.
语种：
中文
展开
柔索索力主频阶次误差及支承条件误差
作者：
陈常松;陈政清;颜东煌
期刊：
交通运输工程学报 ,2004年4(4):17-20 ISSN：1671-1637
通讯作者：
Chen, C.-S.(changsongchen@vip.sina.com)
作者机构：
[陈常松; Van, Dong-Huang] Sch. of Bridge and Struct. Eng., Changsha Univ. of Sci. and Technol., Changsha 410076, China;[陈常松; 陈政清] Sch. of Civ. Eng. and Architecture, Central South University, Changsha 410075, China
通讯机构：
Sch. of Bridge and Struct. Eng., Changsha Univ. of Sci. and Technol., China
关键词：
桥梁工程;索力;自振频率;频率阶次;支承条件;误差
摘要：
为研究柔索索力测试中拉索自振频率阶次和支承条件对索力测试误差的影响规律,利用动平衡法推导了考虑弯曲刚度的柔索自振方程和自振频率公式,采用瑞利能量法分析了弹性支承条件和附加质量对拉索自振频率的影响.研究发现频率阶次对索力计算公式的影响符合二次抛物线分布特征,附加质量使拉索的自振频率减小,传感器等测试用的质量块的影响可以忽略不计,弹性支承引起的误差与弹性链杆刚度成线性关系,而且与主频的阶次有关.分析和试验结论对大跨度柔索承重结构如斜拉桥和悬索桥的索力测试具有指导意义.
语种：
中文
展开
Singularity representation of multiscale damage due to inhomogeneity with mesomechanics consideration
作者：
Sih, G.C.;Tang, X.S.
期刊：
Multiscaling in Applied Science and Emerging Technology, Fundamentals and Applications in Mesomechanics: Proceedings of the Sixth International Conference for Mesomechanics ,2004年:1-15
通讯作者：
Sih, G.C.(gcs@ecust.edu.cn)
作者机构：
[Tang, X.S.; Sih, G.C.] School of Mechanical Engineering, E. China Univ. of Sci. and Technol., Shanghai 200237, China;[Tang, X.S.] Sch. of Bridge and Struct. Eng., Changsha Univ. of Sci. and Technol., Changsha, Hunan 410076, China;[Sih, G.C.] Department of Mechanical Engineering, Lehigh University, Bethlehem, PA 18015, United States
摘要：
A model, that capture the trasitional stages of failure evolution considering the mesomechanics, is discussed. It is stated that the stress singularities at macro-distance from crack and that from crack-front are different. The characteristics of the geometry, loading and material are captured as a combination by the order and nature of the stress singularity. It is found that the strength of the sigularity is distance sensitive and reflects the instability behavior of the defect.
语种：
英文
展开
MATLAB在结构稳定性分析中的应用
作者：
汪优;陈浩军;黄靓
作者机构：
[汪优; 陈浩军; 黄靓] 长沙理工大学结构工程研究所;[汪优; 陈浩军; 黄靓] 湖南大学土木工程学院
会议名称：
中国钢结构稳定与疲劳分会2004年学术交流会
会议时间：
2004-08-11
会议地点：
太原
会议论文集名称：
中国钢结构稳定与疲劳分会2004年学术交流会论文集
关键词：
稳定性;有限元
摘要：
本文通过比较MATLAB与其他工程中常用的编程语言的优缺点后,探讨了MATLAB在结构稳定性分析中的一些应用情况,并利用ANSYS程序验证了本文所编制的MATLAB有限元稳定分析程序的正确性和有效性,说明MATLAB语言是进行结构稳定分析和计算的有力工具。
语种：
中文
展开
求强非线性系统共振解的渐近法
作者：
彭献;盛国刚
期刊：
振动与冲击 ,2004年23(1):45-46+60 ISSN：1000-3835
通讯作者：
Peng, X.
作者机构：
[彭献] Dept. of Eng. Mech., Hu'nan Univ., Changsha 410082, China;[盛国刚] Dept. of Bridge and Structure Eng., Changsha Comm. Univ., Changsha 410076, China
通讯机构：
Dept. of Eng. Mech., Hu'nan Univ., China
关键词：
强非线性系统;参数变换;共振解
摘要：
本文通过引入参数变换α = ε/(υ~2 + ε),并假设ω_0~2 = (pv/q)~2 + α△,把强非线性系统转化为弱非线性系统,再将解展开为傅氏级数,利用参数待定法可方便地求出强非线性系统的共振解.算例表明近似解与数值解非常接近.
语种：
中文
展开
钢箱提蓝拱桥整桥模态试验研究
作者：
田仲初;陈常松;郑万泔
期刊：
振动与冲击 ,2004年23(2):44-47+43 ISSN：1000-3835
通讯作者：
Tian, Z.
作者机构：
[陈常松; 田仲初] Coll. of Bridge and Structure Eng., Changsha Univ. of Sci. and Technol., Changsha 410076, China;[郑万泔] Nanjing Anzheng Software Corp., Nanjing 210009, China
通讯机构：
Coll. of Bridge and Structure Eng., Changsha Univ. of Sci. and Technol., China
关键词：
桥梁
摘要：
随着大型柔性桥梁建设的迅速发展，其长期安全运行的健康监测的评估得到很大关注。通过试验模态分析对验证设计、建立结构的动力学模型以及桥梁安全运行状态的评估具有重要意义。拱桥桥面主梁与拱结构耦合振动，其模态试验比斜拉桥更加困难。本文通过我国首座建成的云南小湾钢箱提篮拱桥模态试验和竣工试验，提出了一种节省试验成本的基于环境激励下桥梁模态试验方法，取得了拱桥整体振动的较为正确的模态频率、阻尼及较理想振型，与有限元计算基本吻合。
语种：
中文
展开
Simultaneity of multiscaling for macro-meso-micro damage model represented by strong singularities
作者：
Sih, GC* ;Tang, XS
期刊：
Theoretical and Applied Fracture Mechanics ,2004年42(3):199-225 ISSN：0167-8442
通讯作者：
Sih, GC
作者机构：
E China Univ Sci & Technol, Sch Mech Engn, Shanghai 200237, Peoples R China.;Lehigh Univ, Dept Mech Engn & Mech, Bethlehem, PA 18015 USA.;Changsha Univ Sci & Technol, Sch Bridge & Struct Engn, Changsha 410076, Hunan, Peoples R China.;[Sih, GC] E China Univ Sci & Technol, Sch Mech Engn, Mail Box 295,130 Melong St, Shanghai 200237, Peoples R China.
通讯机构：
[Sih, GC] E;E China Univ Sci & Technol, Sch Mech Engn, Mail Box 295,130 Melong St, Shanghai 200237, Peoples R China.
关键词：
multiscaling;macro-meso-micro damage;strong singularities;intergranular and transgranular failure;non-homogeneity;geometric effect;loading rate and material;strain energy density function
摘要：
The state of affairs near a crack tip is very different when viewed at the different scales, say from the macroscopic to the atomic. These different appearances have intrigued solid state physicists, mechanists and material scientists for decades. Although they are physically connected, it is not obvious what roles would their mathematical relationships play? Investigations associated with scaling in size and time, evolution of material damage, multiscaling of macro-, meso- and micro-mechanics theories are presumably topics that could provide insights to the behavior of the internal structures of matters and their interactions at the different scales. When seeking for analytical models that can address multiscaling, continuum mechanics seems to give way to the particle approach when the scale reduces to that for the atoms. It is also not clear whether the particle and continuum view points should be regarded as separate disciplines for their differences have generated much discussion with little to gain. There is the general feeling that a re-examination of what has been taken for granted may be in order. Based on the comments made earlier, a multiscale crack damage model is developed by duplicating the physics much like the capability of an optical or electronic microscope. The model contains the macroscopic, mesoscopic and microscopic damage represented by singularities. The results at the different scale levels are connected via stress and displacement compatibility conditions in continuum mechanics and they can switch from one scale to another in a discrete manner where equilibrium is assumed within the range of an arbitrarily defined scale. The sizes involved at the different scales depend on the material, load and geometry and they are determined by solving two highly non-linear equations. Simplicity is gained by using singularities to represent the geometrical discontinuities such as intergranular or transgranular failure. This discussion is limited to a particular group of material damage that can be modelled by the so-called strong singularities as compared to the r<sup>-0.5</sup> singularity at the continuum level. The strong singularities would correspond to 0.25 <λ* <0.5 where λ* = 0.5 corresponds to the singular stress behavior for a line crack in an elastic medium. The lowest real part of the eigenvalue λis denoted by λ*. In passing, it should be pointed out that the 1/r singularity (i.e. λ* = 0) corresponds to an edge dislocation which will not be included in this discussion. In order not to cluster the presentation with unnecessarily complex notations of distinguishing the difference between the macroscopic and microscopic constants, the same set of constants will be assumed. Besides, there are fundamental issues with reference to the definition of microscopic material properties whether they should be obtained from testing micro-size specimens or considered as local material properties as part of the bulk. These two contrasting views are not the same. The choice to use one or the other remains debatable. The emphasis here is placed on relating strong singularity group to the geometry of a micro-notch where one notch edge is free and the other is fixed. It is connected to a transition or mesoscopic zone. The notch angle can be varied to model different degrees of intergranular opening. The microscopic non-homogeneous features are reflected by the rotations of the lines with different notch angles in a log-log plot of the strain energy density function with distance. Keep in mind that when the same near crack tip region is viewed at the macroscopic scale, the state of affairs are homogeneous. This in essence is what a microscope does. The objective of this work is to demonstrate that such a capability can be built into an analytical model with all of the complexities of the microstructure, the description of which are made possible by the singularity representation approach. ©2004 Elsevier Ltd. All rightss reserved.
语种：
英文
展开
交错桁架结构体系的楼板与钢桁架间滑移的理论分析
作者：
黄宇峰;刘永健
期刊：
湖南大学学报(自然科学版) ,2003年(S1):106-108 ISSN：1674-2974
作者机构：
湖南大学土木工程学院;长沙交通学院 湖南 长沙 410082;湖南 长沙 410076
关键词：
交错桁架;滑移;截面剪力;微分方程组
摘要：
交错桁架结构体系的楼板与钢桁架间的滑移对交错桁架结构体系的承载能力及变形有极大的影响,不考虑滑移就不足以真实地反映出楼板与钢桁架的交互作用。本文根据基本弯曲理论,从理论上分析了交错桁架结构体系的楼板与钢桁架间的滑移,建立了滑移量S与截面剪力V之间的微分方程组,并求出了一典型交错桁架结构体系的楼板与钢桁架间滑移沿桁架理论分布。
语种：
中文
展开
K型方钢管砼节点极限承载力有限元分析
作者：
李梓祥;刘永健;江冰
期刊：
湖南大学学报(自然科学版) ,2003年(S1):102-105 ISSN：1674-2974
作者机构：
湖南大学土木工程学院;长沙交通学院;湖南大学土木工程学院 湖南 长沙 410082;湖南 长沙 410076
关键词：
方钢管混凝土节点;非线性有限元法;极限承载力
摘要：
运用ANSYS程序对6个典型K型方钢管混凝土节点和1个K型方钢管节点进行了非线性有限元分析,研究了节点极限承载力随几何参数的变化规律及主管中混凝土对节点极限承载力的影响,并与试验结果进行对比分析,揭示了节点的玻坏机理和破坏模式。
语种：
中文
展开
岩石隧道信息化设计与施工方法研究
作者：
刘辉;宋选宝;陈文胜
期刊：
公路与汽运 ,2003年(5):76-78 ISSN：1671-2668
作者机构：
[刘辉; 陈文胜] 长沙理工大学;[宋选宝] 湖南省移民管理局
关键词：
岩石隧道;信息化设计;施工方法;监测测试系统;围岩;稳定性;支护
摘要：
根据信息化设计与施工所具有的特点,结合隧道建设的发展趋向,布置适宜的监测测试系统,并获取围岩稳定性及支护状态的工作信息,确保施工安全.
语种：
中文
展开
混凝土斜拉桥合理成桥状态确定的分步算法
作者：
颜东煌;李学文;刘光栋;易伟建
期刊：
中国公路学报 ,2003年16(1):43-46 ISSN：1001-7372
通讯作者：
Yan, D.-H.
作者机构：
[颜东煌; 李学文] 长沙交通学院桥梁与结构工程系;[刘光栋; 易伟建] 湖南大学土木工程学院;湖南大学土木工程学院 湖南长沙410076;湖南长沙410082
通讯机构：
Dept. of Bridge and Structure Eng., Changsha Commun. Univ., China
关键词：
混凝土斜拉桥;桥梁工程;分步算法;应力平衡法;成桥状态;桥梁设计;结构分析
摘要：
在现有的最小弯曲能量法、影响矩阵法和应力平衡法等方法的基础上 ,提出了斜拉桥合理成桥状态确定的分步算法。基本思路是 :先用最小弯曲能量法初定成桥状态 ;然后以应力平衡法确定主梁合理预应力和主梁成桥恒载弯矩“可行域”;最后用影响矩阵法确定综合考虑主梁、塔和索等结构受力要求的合理成桥状态。
语种：
中文
展开
焊接矩形钢管T,Y,X型节点的极限承载力计算
作者：
江冰;周绪红;刘永健
期刊：
湖南大学学报(自然科学版) ,2003年(S1):99-101 ISSN：1674-2974
作者机构：
湖南大学土木工程学院;长安大学;长沙交通学院 湖南 长沙 410082;陕西 西安 710064;湖南 长沙 410076
关键词：
矩形钢管;节点;极限承载力
摘要：
焊接矩形钢管T,Y,X型节点是钢管桁架中常用的节点形式,但其极限承载力计算仍是较为突出的问题。本文对这种节点现有的极限承载力公式进行了分析,然后提出了极限承载力计算的修正公式。并将国内外试验数据对这些公式进行了比较,可以看出修正公式计算精度高,可供工程设计时参考。
语种：
中文
展开
粘弹性正交各向异性对称层合析的非线性动力响应
作者：
胡浩;傅衣铭
期刊：
湖南大学学报(自然科学版) ,2003年30(5):79-83 ISSN：1674-2974
作者机构：
[胡浩; 傅衣铭] 湖南大学工程力学系;湖南大学工程力学系 湖南长沙 410082长沙理工大学桥梁与结构工程系湖南长沙 410076
会议名称：
全国固体力学学术会议
会议时间：
2002-08-01
会议地点：
大连
会议论文集名称：
全国固体力学学术会议论文集
关键词：
粘弹性;层合板;非线性动力响应
摘要：
分析了几何非线性粘弹性正交各向异性对称层合矩形板的非线性动力响应问题。由Kirchhoff假设，Boltzmann算子和Karman方程，在假设poisson比为常数的条件下，推导了粘弹性正交各向异性对称层合板的非线性动力方程，该方程为一非线性偏微分－积分方程组。经元量纲化和应用Galerkin方法之后，得到关于时间变量的非线性微分－积分的方程，以三层（单层各向同性）对称矩形层合板作为特例进行数值计算，得到不同材料性质对频谱曲线以及时间－位移曲线的影响，当退化为各向同性粘弹性薄板时，其计算结果与文[1]的一致。
语种：
中文
展开
基坑工程信息化施工
作者：
刘辉
作者机构：
[刘辉] 长沙理工大学岩土工程研究所
会议名称：
湖南省岩石力学与工程学会2003年年会
会议时间：
2003-11-27
会议地点：
中国湖南长沙
关键词：
信息化施工;监测;预警值
摘要：
在深基坑施工过程中,只有对基坑支护结构、基坑周围的土体和相邻的构筑物进行全面系统的监测,才能对基坑工程的安全性和对周围环境的影响程度有全面的了解,以确保工程的顺利进行。
语种：
中文
展开
冷轧带肋钢筋混凝土受弯构件疲劳性能的试验研究
作者：
陈浩军;彭艺斌;张起森
期刊：
东南大学学报(自然科学版) ,2002年32(5):737-740 ISSN：1001-0505
通讯作者：
Chen, H.(Chjun@public.cs.hn.cn)
作者机构：
[张起森; 陈浩军; 彭艺斌] Dept. of Bridge and Structure, Changsha Commun. Univ., Changsha 410076, China
通讯机构：
[Chen, H.] D;Dept. of Bridge and Structure, Changsha Commun. Univ., China
会议名称：
第七届全国混凝土结构基本理论及工程应用学术会议
会议时间：
2002-10-01
会议地点：
南京
会议论文集名称：
东南大学学报(自然科学版)32卷
关键词：
冷轧带肋钢筋;简支构件;等幅疲劳荷载;疲劳方程
摘要：
对不同配筋率的冷轧带肋钢筋混凝土简支标准梁(550mm×150mm×150mm)进行了等幅疲劳荷载试验研究,疲劳试验试件60根,试件配筋率分别为0%,0.29%,0.487%,0.934%和1.946%.这批试件的疲劳破坏形式为:折断破坏、弯拉破坏和剪压破坏.针对不同的疲劳破坏形式,分析了产生不同破坏形式的原因,提出了界限配筋率的概念.受弯构件适当配置冷轧带肋钢筋不仅具有良好的抗裂性能和延性,而且其疲劳寿命也有显著的提高.提出了考虑不同配筋率影响的、可供配筋混凝土路面设计参考的疲劳方程.
语种：
中文
展开
