作者： Zhang, Xuebing;Zhang, Zhanwei;Cao, Guohui*;Mo, Dongshan

期刊： Advances in Structural Engineering,2020年24(2):307-319 ISSN：1369-4332

通讯作者： Cao, Guohui

作者机构： [Zhang, Zhanwei; Mo, Dongshan; Zhang, Xuebing] Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan, Hunan, Peoples R China.;[Cao, Guohui] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.

通讯机构： [Cao, Guohui] H;Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.

关键词： composite continuous box beam;deflection;local prestressing;redistribution of internal forces;slip

摘要： The flexural bearing capacities of three composite continuous box beams with different prestressing degrees were tested and studied to investigate the influences of local prestressing bundles on the deflection, relative slip of interface, strain, and redistribution of the internal force of the steel–concrete composite continuous box beam. Results show that the arrangement of local prestress can not only improve the bending stiffness at the mid-span of the composite continuous box beam, but also significantly enhance the ductility. In the design process of the local prestressed composite continuous box beam, the influence of the slip at the middle support should be fully considered, and the deflection could not be taken as a control factor. The internal force redistribution of the local prestressed continuous box beam is lower than that of the ordinary continuous box beam, but it still has good plastic internal force redistribution. The number of prestressing bundles in the negative moment region is the main factor that affects the internal force redistribution of the middle support. © The Author(s) 2020.

语种： 英文

作者： 李克忠;曹国辉;杨李根

期刊： 中南大学学报(自然科学版),2020年51(12):3475-3483 ISSN：1672-7207

通讯作者： Cao, Guohui(cgfcivil@163.com)

作者机构： [李克忠] Hunan University Design and Research Institute Co. Ltd., Changsha;410082, China;Changsha Huayi Engineering Design Co. Ltd., Changsha;410000, China;[曹国辉] School of Civil Engineering, Hunan City University, Yiyang

关键词： 预应力混凝土连续箱梁;开裂;修正系数;承载能力

摘要： 为了对不同开裂状态下预应力混凝土连续箱梁桥的承载能力进行快速估算,对比例尺为1:4的三跨预应力混凝土连续梁模型进行荷载试验,将特征截面(支点、1/4跨、1/2跨截面)混凝土应力、应变及梁体跨中挠度的试验实测结果与弹性计算结果和非线性计算结果进行分析、对比,验证模型桥实测结果的可靠性,并根据这三者的关系得出基于弹性理论估算开裂结构受力状态的修正系数;根据公路桥涵设计规范的裂缝宽度计算公式,取修正系数C_3 = 1.25计算裂缝最大宽度W_(ft),通过各级荷载作用下模型裂缝宽度W_1与 W_(ft)的比值(W_1/W_(ft))和对应的截面弯矩承载率(M_1/M_u)之间的关系,提出裂缝宽度比与承载率的函数关系式。研究结果表明:结构开裂后,估算混凝土连续箱梁桥挠度时修正系数可取1.5~2.0,估算应力时修正系数可取1.5~2.5;本研究所得的裂缝宽度比与承载率的函数关系式和挠度、应力修正系数可对桥梁承载能力和安全性进行初步估算和评估。

语种： 中文

作者： 曹国辉;韩传昌;邓昂;唐皇

期刊： 实验力学,2019年34(3):509-516 ISSN：1001-4888

作者机构： 湖南城市学院土木工程学院,湖南益阳413000;湘潭大学土木工程与力学学院,湖南湘潭411105;湘潭大学土木工程与力学学院,湖南湘潭,411105;湖南城市学院土木工程学院,湖南益阳,413000;[邓昂; 韩传昌] 湘潭大学

关键词： 钢筋锈蚀;有效弹性模量;配筋率;混凝土柱;计算模型

摘要： 通过对16根钢筋混凝土柱进行腐蚀与长期荷载共同作用的长期试验,研究构件在不同配筋率、钢筋锈蚀率及加载龄期下有效弹性模量的变化规律,配筋率分别为1%、2%、3%,钢筋锈蚀率分别为0%、10%、20%,加载龄期分别为7d和28d。研究结果表明:配筋率与加载龄期对钢筋混凝土有效弹性模量都有影响,两种影响具有叠加效应,并且这种叠加效应不只是简单的线性叠加;钢筋锈蚀率越大,钢筋混凝土有效弹性模量越小。在试验研究的同时,还提出了考虑配筋率与钢筋锈蚀率的混凝土柱有效弹性模量计算模型,通过模型计算值与试验值的相对误差对比,验证了本文计算模型的有效性和适用性。

语种： 中文

作者： 熊辉;阳亮;曹国辉

期刊： 铁道科学与工程学报,2018年15(6):1524-1533 ISSN：1672-7029

作者机构： 湖南大学土木工程学院, 湖南, 长沙, 410082;湖南城市学院土木工程学院, 湖南, 益阳, 413000;[熊辉; 阳亮] 湖南大学土木工程学院, 湖南, 长沙, 410082;[曹国辉] 湖南城市学院土木工程学院, 湖南, 益阳, 413000

关键词： 抗剪连接件;推出试验;栓钉锈蚀;耦合作用;荷载-滑移曲线

摘要： 通过8个标准连接件的推出试验,研究长期荷载卸载后锈蚀栓钉连接件的静力性能,了解长期荷载与栓钉锈蚀对连接件抗剪承载力、荷载-滑移曲线及变形能力的影响。试验结果表明:推出试验中,栓钉经历了先受压再受拉最后剪断3个受力阶段,栓钉受压处混凝土应变远远高于周边混凝土,随着荷载的增加,连接件刚度处在一个加速退化的状态;腐蚀与荷载存在耦合作用,对于栓钉受拉侧,腐蚀与荷载耦合加速栓钉锈蚀,对于栓钉受压侧,腐蚀与荷载耦合抑制栓钉锈蚀;长期荷载加速初始滑移的发展,但对试件最终滑移量及承载力影响不大,栓钉锈蚀降低试件刚度,加大滑移发展速率,降低极限承载力,对最终滑移量影响显著。最后,通过参数拟合方法建立锈蚀栓钉连接件抗剪承载力及荷载-滑移曲线计算公式,拟合结果表明,计算公式能够较准确地计算锈蚀栓钉连接件的抗剪承载力、滑移终值及荷载-滑移曲线,可为组合结构锈蚀计算提供参考。

语种： 中文

作者： Cao, Guohui*;Han, Chuanchang;Dai, Ye;Zhang, Wang

期刊： Journal of Bridge Engineering,2018年23(9):04018067 ISSN：1084-0702

通讯作者： Cao, Guohui

作者机构： [Cao, Guohui; Han, Chuanchang] Xiangtan Univ, Coll Civil Engn & Mech, North Second Ring Rd, Xiangtan 411105, Hunan, Peoples R China.;[Cao, Guohui] Hunan City Univ, Coll Civil Engn, 518,Yingbin East Rd, Yiyang 413000, Hunan, Peoples R China.;[Dai, Ye; Zhang, Wang] Changsha Univ Sci & Technol, Sch Civil Engn & Architecture, 960,2nd Sect,Wanjiali South Rd, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Cao, Guohui] X;[Cao, Guohui] H;Xiangtan Univ, Coll Civil Engn & Mech, North Second Ring Rd, Xiangtan 411105, Hunan, Peoples R China.;Hunan City Univ, Coll Civil Engn, 518,Yingbin East Rd, Yiyang 413000, Hunan, Peoples R China.

关键词： Concrete beams and girders;Concrete slabs;Creep;Deflection (structures);Growth rate;Prestressed beams and girders;Prestressing;Shrinkage;Steel testing;Box beam;Effective moduli;Internal force redistribution;Long term performance;Shrinkage and creep;Concrete testing

摘要： A long-term load test of 420 days was performed on three prestressed steel-concrete composite continuous box beams (non-prestressed, partly prestressed, and fully prestressed) to investigate the combined effects of sustained load, shrinkage, creep, and prestressing. Several time-varying parameters, such as deflection, concrete strain, prestressing force, support reaction, and relative slippage between the concrete slab and the steel box beam, were monitored in the test. The long-term performance of the prestressed beams that was developed using a special law increased and decreased the support reactions at the middle and end piers over time, respectively, due to the distinct configuration of prestressed strands (i.e., installation was only at the negative moment area). The growth rate of the deflection of the prestressed beams was slightly greater than that of the deflection of the non-prestressed beam. Moreover, cracking at the negative moment region significantly accelerated the development of the relative slippage of the non-prestressed beam. A calculation model of long-term deflection based on classical theories was proposed to theoretically analyze the measured data and provide valuable insights for future research. © 2018 American Society of Civil Engineers.

语种： 英文

作者： Cao, Guohui*;Yang, Liang;Zhang, Wang;Peng, Xirong;Dai, Ye

期刊： Journal of Materials in Civil Engineering,2018年30(5) ISSN：0899-1561

通讯作者： Cao, Guohui

作者机构： [Peng, Xirong; Cao, Guohui] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Yang, Liang] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China.;[Dai, Ye; Zhang, Wang] Changsha Univ Sci & Technol, Sch Civil Engn & Architecture, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Cao, Guohui] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.

关键词： Bridges;Composite structures;Concrete slabs;Concretes;Corrosion;Couplings;Creep;Deformation;Elastic moduli;Shrinkage;Sodium chloride;Specifications;Structure (composition);Studs (fasteners);Studs (structural members);Environmental corrosions;Long term performance;Mechanical behavior;Modern buildings;Shear connector;Shrinkage and creep;Steel concrete composite structures;Structural durability;Rigid structures;concrete;corrosion;creep;elastic modulus;loading;mechanical property;shrinkage;steel

摘要： Steel-concrete composite structures are widely used in modern buildings and bridges for their great rigidity, light weight, and simple construction. However, the mechanical behaviors of steel-concrete composite structures degrade over time because of environmental corrosion and long-term load. The existing research on structural durability has often focused on concrete or steel structures. Few studies have been conducted on steel-concrete composite structures, especially on structures under the coupled impact of corrosion and load. To investigate the coupled impact of corrosion and load on the performance of steel-concrete composite structures, a long-term test of 200 days was carried out on eight connectors. The corrosion of the studs was accelerated by DC current, and the test connectors were submerged in a salt solution with a concentration of 5% NaCl. Deformations including the concrete strain and relative slippage between the concrete slab and the steel beam were measured in the long-term test. The experimental results showed that at the end of the long-term test, the deformations induced by shrinkage were about three times larger than those induced by creep for the steel-concrete composite structures. Notably, the stiffness of the connectors degraded substantially with the aggravation of the corrosion of the studs, whereas the concrete strain was only slightly affected by the studs' corrosion. The measured deformations were also obviously larger than those calculated by the current specifications. As a reference, a suitable formula for the long-term elastic modulus is proposed to enhance the applicability of specifications © 2018 American Society of Civil Engineers.

语种： 英文

作者： Cao, Guo Hui*;Zhang, Sheng;Zhang, Wang;Peng, Xi Rong

期刊： KSCE Journal of Civil Engineering,2018年22(2):688-695 ISSN：1226-7988

通讯作者： Cao, Guo Hui

作者机构： [Cao, Guo Hui; Peng, Xi Rong] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Hunan, Peoples R China.;[Zhang, Sheng; Zhang, Wang] Changsha Univ Sci & Technol, Coll Civil Engn & Architecture, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Cao, Guo Hui] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Hunan, Peoples R China.

关键词： simply supported box beam;long-term deflection;theoretical calculation;prestressed concrete;effective modulus method

摘要： A long-term deflection test is performed for 470 days on two simply supported prestressed concrete box beams under sustained uniform load. The deflection growth rules of the box beams under both cracked and uncracked states are studied. The measured longterm deflection of the cracked beam is 18.4% larger than that of the uncracked beam, whereas the deflection growth coefficient of the cracked beam is 65.3% that of the uncracked beam. The larger long-term deflection of the cracked beam is mainly attributed to the huge value of the instantaneous deflection caused by the crack. Then, the cracks lead to the release of concrete stress, thereby reducing the creep effect. For the uncracked beam, the influences of concrete shrinkage, creep, and prestress loss on the long-term mechanical behavior of components are considered, and then deflection is predicted using the blended method based on the age-adjusted modulus method, the prestressed equivalent load method, and the calculation method for prestress loss. Results show that the theoretical and measured values are in good agreement. For the cracked beam, the crack influence coefficient is introduced to revise its effective elastic modulus by considering the influence of cracks on the long-term deflection of the cracked beam. Then, a formula for calculating the long-term deflection of cracked beams that considers stiffness reduction for instantaneous deflection correction is proposed. The formula exhibits high precision in calculating and analyzing the long-term deflection of the cracked beam. The deviation between the calculated and measured values is within 10%.

语种： 英文

作者： Cao, Guohui*;Zhang, Wang;Hu, Jiaxing;Zhang, Kai

期刊： International Journal of Civil Engineering,2018年16(8):887-895 ISSN：1735-0522

通讯作者： Cao, Guohui

作者机构： [Cao, Guohui; Zhang, Kai] Hunan City Univ, Coll Civil Engn, 518 Yingbin East RD, Yiyang 413000, Hunan, Peoples R China.;[Zhang, Wang] Changsha Univ Sci & Technol, Coll Civil Engn & Architecture, 960,2nd Sect,Wanjiali South RD, Changsha 410114, Hunan, Peoples R China.;[Hu, Jiaxing] Hunan Univ, Coll Civil Engn, Lushan South RD, Changsha 410082, Hunan, Peoples R China.

通讯机构： [Cao, Guohui] H;Hunan City Univ, Coll Civil Engn, 518 Yingbin East RD, Yiyang 413000, Hunan, Peoples R China.

关键词： Concrete beams and girders;Deflection (structures);Prestressed beams and girders;Prestressed concrete;Prestressing;Shrinkage;Bonded materials;Deflection;Long-term behavior;Long-term deflections;Pre-stressed;Prestress loss;Regular patterns;Retard-bonded;T beams;Uniform loads;Creep

摘要： This study compares the mechanical properties of the retard-bonded and conventionally bonded prestressed concrete (RBPC and BPC, respectively) under uniform loads. Results show that the prestressed strands and concrete of the RBPC T-beams are firmly bonded with harden of retard-bonded materials, thereby exhibiting the same mechanical properties as that of the BPC beams. The growth rate of the long-term deflections of the RBPC T-beam is slightly lower than that of the BPC T-beam. Given the effect of concrete shrinkage, creep and time variation of prestress loss, the regular patterns of deflection growth of the RBPC T-beam mid-spans are analysed based on the age-adjusted effective modulus method, method of equivalent prestress load and calculation model of prestress loss. Accordingly, the long-term deflection development curves of the RBPC T-beam mid-spans under self-weight, prestressing force and external loads are obtained. Calculation results are in good agreement with the test results. This method has immense applicability for the computation of the RBPC T-beams, and can be used to estimate the long-term deflection growth of regular patterns of the RBPC components. © 2017, Iran University of Science and Technology.

语种： 英文

作者： 蒋建清;曹国辉;陈东海;贺冉;何敏

期刊： 实验室研究与探索,2018年37(2):144-149 ISSN：1006-7167

作者机构： 湖南城市学院土木工程学院,湖南益阳,413000;[贺冉; 何敏; 陈东海; 曹国辉; 蒋建清] 湖南城市学院

关键词： 虚拟仿真实验;实验教学中心;土木工程;应用型;地方高校

摘要： 虚拟仿真实验技术应用于土木工程教学领域,可以解决传统土木工程实践教学与现代应用型人才培养之间的一些突出矛盾。结合地方高校对接产业发展和行业需求、面向工程实践培养应用型人才的现实需要,论述了应用型地方高校土木工程虚拟仿真实验教学中心的建设理念和土木工程虚拟仿真实验教学体系的构建思路,分析了土木工程虚拟仿真实验教学资源平台的功能和组构模式。实践表明,为提升学生的创新意识、工程实践能力、信息化应用能力、综合素质和自主实验的学习兴趣,提高土木工程应用型人才培养成效,地方高校应校企合作开发"层次化、模块化、体系化"的土木工程虚拟仿真实验教学资源,建立"高度仿真、虚实结合、开放共享"的应用型虚拟仿真实验系统,积极开展土木工程虚拟仿真实验教学。

语种： 中文

作者： 莫东山;曹国辉

期刊： 湖南城市学院学报(自然科学版),2018年27(5):7-11 ISSN：1672-7304

作者机构： 湘潭大学 土木工程与力学学院,湖南 湘潭,411100;[曹国辉; 莫东山] 湘潭大学

关键词： 预应力;钢-混凝土组合连续箱梁;刚度;开裂;挠度

摘要： 对3片钢-混凝土组合连续箱梁跨中挠度进行了试验研究与理论分析,考虑开裂和滑移效应的影响,采用换算截面法和虚功原理建立了组合梁挠度计算表达式,推导了混凝土支座负弯矩区开裂长度计算表达式.研究结果表明,挠度理论计算值均与试验值吻合较好,预应力施加可提高混凝土开裂荷载,但对挠度的影响不显著.

语种： 中文

作者： 蒋建清;曹国辉;贺冉;陈东海;何敏

期刊： 教育现代化,2017年4(39):1-3 ISSN：2095-8420

作者机构： 湖南城市学院 土木工程学院,湖南 益阳,413000;[贺冉; 何敏; 陈东海; 曹国辉; 蒋建清] 湖南城市学院

关键词： 土木工程;实验教学;工程实践能力;应用技术型;地方高校

摘要： 土木工程实验教学是应用技术型地方高校培养学生工程实践能力和创新应用意识的重要途径.本文从应用技术地方高校实际出发,结合实验室建设的现实情况,探讨强化工程实践能力的土木工程实验教学模式,为培养学生的工程实践能力探索多样化的途径,使土建类学生的实验学习兴趣、积极性和主动性得到明显提高,工程实践能力、创新能力和综合素质不断提升,可供同类院校土木工程应用型人才培养参考.

语种： 中文

作者： 曹国辉;阳亮;张锴;彭细荣

期刊： 中南大学学报(自然科学版),2017年48(2):506-511 ISSN：1672-7207

通讯作者： Zhang, Kai(349639499@qq.com)

作者机构： [曹国辉; 张锴; 彭细荣] College of Civil Engineering, Hunan City University, Yiyang;413000, China;[阳亮] College of Civil Engineering, Hunan University, Changsha;410082, China;[曹国辉; 张锴; 彭细荣] 413000, China

通讯机构： College of Civil Engineering, Hunan City University, Yiyang, China

关键词： 钢筋混凝土柱;徐变;钢筋修正系数;基于龄期调整的有效模量法;配筋率

摘要： 基于龄期调整的有效模量法和内力重分布机理,引入钢筋修正系数预测钢筋混凝土的徐变并且推导出相应的计算公式。通过对相关数据进行拟合分析,验证钢筋修正系数的有效性和实用性。在此基础上,提出基于现行公路桥涵设计规范徐变模型的配筋混凝土徐变计算公式,并分析老化系数、配筋率、加载龄期等参数对徐变的影响。研究结果表明:配筋对混凝土徐变具有抑制作用;当配筋率很小时,配筋对混凝土的相对抑制作用最强,随着配筋率增大,相对抑制作用逐渐降低;加载龄期和配筋对混凝土徐变的影响有叠加作用,并且这种叠加作用不只是简单的线性叠加。

语种： 中文

作者： Cao Guo-hui*;Zhang Wang;Peng Xi-rong;Zhang Sheng

期刊： 中南大学学报(英文版),2017年24(11):2685-2692 ISSN：2095-2899

通讯作者： Cao Guo-hui

作者机构： [Cao Guo-hui; Peng Xi-rong] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Zhang Wang; Zhang Sheng] Changsha Univ Sci & Technol, Coll Civil Engn & Architecture, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Cao Guo-hui] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.

关键词： PC box girders;long-term load experiment;flexural behaviors;cracks;static performance

摘要： Long-term load and flexural failure experiments are carried out on two prestressed concrete (PC) simply supported box girders. In the long-term load experiment, girder-1 (G1) is in an elastic state, while girder-2 (G2) is in a cracking state. To investigate the influence of cracking on the flexural behaviors of PC simply supported box beams, the experiment results are analyzed from many aspects, such as load–deflection, load–strain, and failure mode. Experiment results show the following: 1) the shrinkage and creep of concrete have considerable influences on the long-term deflection and strain of the two girders; 2) in the flexural failure experiment, the cracks and ultimate loads of the two girders are close. The rigidity degeneration of G2 is significantly faster than that of G1, and thus G2 shows nonlinear characteristics earlier; 3) to prove the validity and rationality of the current code, the cracking load and ultimate load of the two girders are calculated according to the current code. © 2017, Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： Cao Guo-hui*;Hu Jia-xing;Zhang Kai

期刊： 中南大学学报(英文版),2016年23(2):470-478 ISSN：2095-2899

通讯作者： Cao Guo-hui

作者机构： [Cao Guo-hui; Zhang Kai] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Hu Jia-xing] Hunan Univ, Coll Civil Engn, Changsha 410082, Peoples R China.

通讯机构： [Cao Guo-hui] H;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.

关键词： prestress;relaxation loss;shrinkage and creep;theoretical analysis;calculation model

摘要： The calculation model for the relaxation loss of concrete mentioned in the Code for Design of Highway Reinforced Concrete and Prestressed Concrete Bridges and Culverts (JTG D62—2004) was modified according to experimental data. Time-varying relaxation loss was considered in the new model. Moreover, prestressed reinforcement with varying lengths (caused by the shrinkage and creep of concrete) might influence the final values and the time-varying function of the forecast relaxation loss. Hence, the effects of concrete shrinkage and creep were considered when calculating prestress loss, which reflected the coupling relation between these effects and relaxation loss in concrete. Hence, the forecast relaxation loss of prestressed reinforcement under the effects of different initial stress levels at any time point can be calculated using the modified model. To simplify the calculation, the integral expression of the model can be changed into an algebraic equation. The accuracy of the result is related to the division of the periods within the ending time of deriving the final value of the relaxation loss of prestressed reinforcement. When the time division is reasonable, result accuracy is high. The modified model works excellently according to the comparison of the test results. The calculation result of the modified model mainly reflects the prestress loss values of prestressed reinforcement at each time point, which confirms that adopting the finding in practical applications is reasonable. © 2016, Central South University Press and Springer-Verlag Berlin Heidelberg.

语种： 英文

作者： 曹国辉;张旺;胡佳星;张锴;张胜

期刊： 中南大学学报(自然科学版),2016年47(2):628-634 ISSN：1672-7207

通讯作者： Cao, Guohui(cgfcivil@163.com)

作者机构： [曹国辉; 张锴] School of Civil Engineering, Hunan City University, Yiyang;413000, China;[张旺; 张胜] School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha;410114, China;[胡佳星] School of Civil Engineering, Hunan University, Changsha

通讯机构： School of Civil Engineering, Hunan City University, Yiyang, China

关键词： 钢管混凝土(CFST);收缩徐变;计算模型;理论分析

摘要： 为研究钢管混凝土(CFST)徐变特性,在室内环境中对8根圆柱体试件进行870 d徐变测试。基于混凝土徐变的继效流动理论和多轴应力作用下的徐变理论,结合钢管混凝土轴心受压构件的受力特点,提出钢管混凝土徐变系数预测模型。研究结果表明:钢管混凝土徐变变形在100 d后趋于稳定,较普通混凝土稳定时刻变形时间提前,提出的预测模型能反映钢管混凝土的徐变机理,将钢管混凝土徐变变形分为可恢复滞后弹性变形、不可恢复的初始急流塑性变形和不可恢复的黏性流变3部分考虑,公式简洁,计算效果较好。

语种： 中文

作者： 蒋建清;曹国辉;邓宗伟;贺冉

期刊： 课程教育研究,2015年(32):7-9 ISSN：2095-3089

作者机构： 湖南城市学院 土木工程学院 湖南 益阳 413000;School of Civil Engineering, Hunan City University, Yiyang 413000, Hunan, China;[贺冉; 曹国辉; 蒋建清; 邓宗伟] 湖南城市学院;[CAI Jing-yao] 湖南城市大学土木工程学院

关键词： 土木工程;应用型人才;执业能力;实验教学体系

摘要： 基于土木工程应用型人才执业能力培养要求，在分析土木工程专业应用型人才执业能力培养的必要性及现状的基础上。结合土木工程实验教学中心多年的应用型人才培养经验，对应用型地方本科院校土木工程专业实验教学进行研究和探索，构建基于执业能力培养的应用型土木工程专业实验教学体系。实践表明，实验教学体系改革取得了较好的成效和示范作用，使学生的工程执业能力得到全方位培养。

语种： 中文

作者： 蒋建清;曹国辉;刘热强

期刊： 岩土力学,2015年36(S2):551-558 ISSN：1000-7598

作者机构： [曹国辉; 蒋建清] School of Civil Engineering, Hunan City University, Yiyang, Hunan, China;[刘热强] Guangdong Provincial Architectural Engineering Machinery Construction Co., Ltd., Guangzhou, Guangdong, China

会议名称： 第十二届全国桩基工程学术会议

会议时间： 2015-10-14

会议地点： 重庆

会议论文集名称： 第十二届全国桩基工程学术会议论文集

关键词： 软土地基;工作机制;堆载预压;砂井;塑料排水板;现场试验

摘要： 针对场地内夹杂岸堤、塘埂和人行道路网的深厚海相软土地基处理,提出塑料排水板和袋装砂井联合堆载预压加固方法,并通过现场试验研究该类地基在路堤填筑及堆载预压过程中的地表及深层沉降特性、超孔隙水压力消散机制和地基水平位移规律等工作性状。结果表明,采用该方法处理深厚海相软土地基具有良好的加固效果,地基沉降大部分在填筑期和预压期间发生,有效降低了场地的工后沉降和施工工期,可为沿海深厚复杂海相软土地基加固处理提供参考;塑料排水板和袋装砂井联合堆载预压处理地基的沉降-时间曲线呈多级式发展,袋装砂井处理部位的沉降量小于塑料排水板处;软基上部土体的排水效果明显优于中、下部土体,排水板处理区域的超孔隙水压力大于砂井处理区域;软基顶部土体向堆载区域移动,地表3 m以下的软土层被挤向堆载处理区域外。

语种： 中文

作者： 曹国辉;胡佳星;张锴

期刊： 建筑结构,2015年45(8):54-58 ISSN：1002-848X

作者机构： [曹国辉; 张锴] 湖南城市学院土木工程学院;[胡佳星] 湖南大学土木工程学院

关键词： 钢筋混凝土圆柱;徐变系数;影响系数;试验研究

摘要： 在恒温恒湿环境中对3根素混凝土和3根钢筋混凝土圆柱进行了500余天收缩徐变试验,研究了低强(C30及以下)钢筋混凝土圆柱徐变特性,结合CEB-FIP(1990)模型和中国建科院模型(1986)对实测数据进行了拟合回归分析,计算出不同加载龄期作用下配筋对混凝土徐变的影响系数,并与采用中国建科院模型(1986)中时变函数的Dischinger方法进行了对比。试验结果表明:相同加载龄期的钢筋混凝土柱徐变系数较素混凝土圆柱的偏小,加载龄期对钢筋混凝土后期徐变系数影响较少;国内外徐变预测模型对短期加载龄期(9d)的徐变系数预测精度较高,对长期加载龄期(39d)的徐变系数预测精度较差,特别是对后期徐变系数预测普遍不足,GZ(1993)模型整体预测效果较好;Dischinger方法中钢筋对低强混凝土徐变影响考虑偏低,对不同加载龄期下钢筋混凝土徐变变形差值预测偏低。

语种： 中文

作者： 曹国辉

期刊： 中国建设教育,2015年(06):74-

作者机构： 湖南城市学院土木工程学院

关键词： 湖南城市学院;土木工程学院;合作人才培养;培训中心;结构设计软件;中国建筑;公开答辩;过程设计;师资培训

摘要： <正>湖南城市学院土木工程学院自2011年起就开始关注BIM技术的发展,并积累了大量资料。2013年,与湖南省建工集团合作成立省级校企合作人才培养示范基地,根据合作交流意向和市场调研结果,首次提出在教学中引导学生应用BIM技术。2014年,土木工程学院投入70余万元,新建拥有100台计算机的机房,为BIM教学和培训奠定了物质基础。2014年,土木工程学院与北

语种： 中文

作者： 曹国辉;张锴;胡佳星;何敏

期刊： 中南大学学报(自然科学版),2015年46(3):1094-1099 ISSN：1672-7207

通讯作者： Zhang, Kai(349639499 @qq.com)

作者机构： [曹国辉; 张锴; 何敏] College of Civil Engineering, Hunan City University, Yiyang;413000, China;[胡佳星] College of Civil Engineering, Hunan University, Changsha;410082, China;[曹国辉; 张锴; 何敏] 413000, China

通讯机构： College of Civil Engineering, Hunan City University, Yiyang, China

关键词： 桥梁与隧道工程;计算模型;非线性拟合;钢管混凝土;收缩应变

摘要： 在室内自然环境下对3个混凝土圆柱体进行长期收缩变形试验研究,并采用最小二乘法对试验数据进行非线性拟合分析,研究钢管混凝土收缩机理。在钢管混凝土收缩机理研究基础上提出钢管膨胀混凝土收缩应变计算模型。研究结果表明:掺合膨胀剂对素混凝土初期(100 d内)收缩应变抑制较大,对后期收缩应变影响较小;对钢管混凝土收缩应变初期(300 d内)影响较大,初期收缩应变几乎不变;钢管混凝土收缩应变主要是核心混凝土自发收缩产生的,自发收缩应变约为1×10~(-4);计算模型考虑了膨胀剂含量、混凝土强度等级、水泥品种和养护方法对核心混凝土收缩影响,该计算模型可预估钢管膨胀混凝土收缩变形规律。

语种： 中文