核电厂硫酸盐侵蚀环境下带裂缝混凝土损伤性能分析模型  

ANALYTICAL MODEL OF DAMAGE PERFORMANCE ON CRACKED CONCRETE SUBJECTED TO EXTERNAL SULFATE ATTACK

作　　者：曾滨[1] 荣华[1] 张璇 徐锋[2] 张清清 ZENG Bin;RONG Hua;ZHANG Xuan;XU Feng;ZHANG Qingqing(Central Research Institute of Building and Construcion Co.,Ltd.,MCC Group,Beijing 100088,China;College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]南京工业大学,南京211816

出　　处：《工业建筑》2019年第12期126-132,共7页Industrial Construction

基　　金：国家重点基础研究发展计划(973计划)(2011CB013801);国家自然科学基础项目(51308285);早龄期商品混凝土黏结性能及相关结构构件力学性能时变性研究(51708565)

摘　　要：混凝土在硫酸盐侵蚀下将发生化学-力学耦合作用,并导致其力学性能和耐久性的降低。基于混凝土在硫酸盐腐蚀下的细观损伤时变模型,建立带裂缝混凝土三点弯曲梁试件的断裂性能分析方法,获得了宏观力学参数解析解及其性能演化规律。试验对比验证了该计算分析方法能较好预测带裂缝混凝土断裂性能演化规律,分析结果还表明硫酸盐腐蚀将降低开裂混凝土的极限承载力和断裂韧度。The chemical-mechanical coupling effect of concrete subjected to sulfate attack would cause the deterioration in mechanical properties and durability of concrete. Based on the time-invariant meso-damage mechanism of concrete under sulfate attack, an analytical method for the fracture performance of cracked concrete beam under three-point bending was proposed, and the analytical solution for fracture parameters and the deterioration of mechanical performance were obtained. The comparison with experimental data verified the accuracy of the presented method to predict the mechanical deterioration of cracking concrete beam. The calculation results showed that the sulfate attack would decrease the bearing capacity and the fracture toughness.

关 键 词：硫酸盐侵蚀 混凝土 损伤 断裂 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]