混凝土抗剪强度概念分析及在桥隧工程中的应用  

Concept Analysis of Shear Strength of Concrete and Its Application to Bridge and Tunnel Engineering

作　　者：刘杰[1] 陈娟娟[1] 

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2015年第1期62-66,93,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：宜昌市自然基础科学研究与应用专项项目(A14-302-a02);三峡大学科学基金资助项目(KJ2013B047)

摘　　要：定义与分析了3种混凝土抗剪强度的概念:基于纯剪应力状态的抗剪强度(定义1)、基于强度理论的抗剪强度(定义2)和基于摩擦抗剪理论的界面抗剪强度(定义3).首先,指出了定义1与古典强度理论的矛盾之处.其次,基于与古典强度理论相协调的思想,提出了新的定义2,根据Mohr-Coulomb强度理论推导了抗剪强度的计算公式.然后,分析了国内外规范对新老混凝土界面抗剪强度计算规定的差异.最后,通过2个桥隧工程示例分析,说明了混淆这3种混凝土抗剪强度定义可能会引起的不合理结果.Three kinds of concepts of concrete shear strength are defined and studied, namely, shear strength based on pure shear stress state （definition 1）, shear strength Lused on the classical strength theory（definition 2） and interface shear strength based on shear-friction theory（definition 3）. Firstly, The conflict between def- inition 1 and the classical strength theory is pointed out. Secondly, in order to harmonize with the classical strength theory, a new definition 2 is proposed. And according to Mohr-Coulomb strength theory, the calcu- lating formula of concrete shear strength is obtained. Furthermore, the difference among calculating provi- sions for shear strength of interface between new and old concrete in worldwide codes is analyzed. Finally, unreasonable results resulting from confusing the three definitions above is illustrated through two case stud- ies in bridge and tunnel engineering.

关 键 词：桥隧工程 混凝土 抗剪强度 强度理论 纯剪切试验 新老混凝土界面 

分 类 号：O346[理学—固体力学]