破坏模式下BFRP筋-混凝土粘结强度计算方法  

Calculation Method for Bond Strength of BFRP Bar-Concrete Based on Failure Mode

作　　者：王智博 陈万祥 孟凡俊 颉浩儒 周新军 戴正 WANG Zhibo;CHEN Wanxiang;MENG Fanjun;JIE Haoru;ZHOU Xinjun;DAI Zheng(College of National Defense Engineering,Army Engineering University of PLA,Nanjing 210007,China;School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,China)

机构地区：[1]陆军工程大学国防工程学院,江苏南京210007 [2]中山大学土木工程学院,广东珠海519082

出　　处：《陆军工程大学学报》2025年第1期79-86,共8页Journal of Army Engineering University of PLA

基　　金：国家自然科学基金(52378548);江苏省自然科学基金(BK20221530)。

摘　　要：玄武岩纤维(basalt fiber reinforced polymer,BFRP)筋是一种可取代钢筋用于土木工程领域的新材料,亟待对BFRP筋-混凝土粘结破坏机理及粘结强度开展深入研究。运用弹塑性力学、混凝土断裂力学等基本理论,描述BFRP筋-混凝土的粘结破坏过程和破坏机理,构建一种半经验半理论的BFRP筋-混凝土粘结强度计算方法。针对基于Logistic回归模型的破坏模式采用相应的计算方法,综合考虑了混凝土强度、BFRP筋直径、混凝土保护层厚度以及加载速率的影响,通过相关试验数据对该方法的可靠性和预测精度进行了验证。结果表明,BFRP筋-混凝土粘结强度与破坏模式密切相关;混凝土抗拉强度是影响粘结强度的主要因素;混凝土的开裂状态取决于BFRP筋直径;混凝土保护层厚度及加载速率直接影响BFRP筋-混凝土的粘结强度。计算结果与试验结果吻合良好,所提方法的预测误差为0.9%~23.7%,可为预测BFRP筋-混凝土粘结强度提供有效参考。The basalt fiber reinforced polymer(BFRP)bar is a new material that can be used in the field of civil engineering instead of steel,and it is urgent to carry out an in-depth study on the failure mechanism of BFRP bar-concrete bond and bond strength.In this paper,the basic theories of elasto-plastic mechanics and concrete fracture mechanics are utilized to describe the bond damage process and failure mechanism of BFRP bar-concrete,and to establish a semi-empirical and semi-theoretical method for calculating the bond strength of BFRP bar-concrete.The method adopts the corresponding calculation method for the damage mode based on the logistic regression model,and comprehensively considers the effects of concrete strength,BFRP bar diameter,concrete protective layer thickness,and loading rate,and finally verifies the reliability and prediction accuracy of the calculation method through the relevant test data.The results show that the bond strength of BFRP bar-concrete is closely related to the damage mode;the tensile strength of concrete is the primary factor affecting the bond strength;the cracking state of concrete depends on the diameter of the BFRP bar;the thickness of the protective layer of concrete and the loading rate directly affects the bond strength of BFRP bar-concrete.The calculation results of this method are in good agreement with the test results,and the prediction error of the proposed method is 0.9%—23.7%,which provides an effective method for predicting the bond strength of BFRP bar-concrete.

关 键 词：玄武岩纤维筋 混凝土 弹塑性力学 粘结性能 破坏机理 

分 类 号：TU528.572[建筑科学—建筑技术科学]