CAJ | 학술논문

对2根钢筋混凝土梁开展高温试验研究，采用合理的材料热工性能和热-力耦合本构关系，应用 ABAQUS 有限元软件对其温度场和结构变形性能进行三维实体有限元分析，温度场和结构变形性能计算结果与试验结果符合较好。在试验验证的基础上，开展有限元参数分析，探讨保护层厚度及荷载水平对钢筋混凝土简支梁抗火性能的影响。结果表明，钢筋混凝土简支梁的保护层越厚，受拉主筋升温越慢，构件变形延缓，耐火极限增大；荷载水平越大，耐火极限越小。
대2근강근혼응토량개전고온시험연구，채용합리적재료열공성능화열-력우합본구관계，응용 ABAQUS 유한원연건대기온도장화결구변형성능진행삼유실체유한원분석，온도장화결구변형성능계산결과여시험결과부합교호。재시험험증적기출상，개전유한원삼수분석，탐토보호층후도급하재수평대강근혼응토간지량항화성능적영향。결과표명，강근혼응토간지량적보호층월후，수랍주근승온월만，구건변형연완，내화겁한증대；하재수평월대，내화겁한월소。
The experiment of two reinforced concrete beams under high temperatures were conducted. A reasonable material thermal performance and thermal-mechanical coupled constitutive relation were adopted in the 3D finite element model by ABAQUS to analyze the performance of reinforced concrete beams.Temperature field and deformation results agree well with the test results.Based on experiment verifications,the effects of protective layer thickness and the load level on the fire resistance of concrete beams were studied by using finite element parametric analysis.Results showed that the thicker the concrete cover is,the slower the temperature rise of tensile reinforcement is,and the smaller the deflection of speciment is,which means that the fire resistance of reinforced concrete beam is longer.Correspondingly,the fire resistance gets shorter when load level is increased.