全轻混凝土与钢筋粘结破坏的能量分析  

Energy analysis of bond failure between all light weight concrete and steel bars

作　　者：杨念旭 蔺新艳[1,2] 杨健辉[1,2] 

机构地区：[1]河南理工大学生态建筑与环境构建河南省工程实验室,河南焦作454000 [2]河南理工大学土木工程学院,河南焦作454000

出　　处：《武汉大学学报（工学版）》2017年第6期915-922,共8页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:41172317)

摘　　要：为了探讨钢筋与全轻混凝土之间的粘结破坏机理,通过全轻混凝土与光圆钢筋和月牙肋钢筋进行的拉拔试验发现,粘结破坏只有劈裂破坏和拔出破坏2种形式;但光圆钢筋只发生拔出破坏,而且月牙肋钢筋对粘结破坏的耗能贡献率远大于光圆钢筋.其次,全轻混凝土与钢筋粘结的能量机制与普通混凝土基本一致,并以能量耗散和能量释放2种类型为主;但前者的总能耗-位移(W-S)曲线突变较为平缓,且突变点也较提前.而根据发生劈裂破坏且钢筋直径d为16、20mm时的试件,较发生拔出破坏且d为12mm时的试件,其总能耗仅为后者的19.7%和30%的结论,进一步表明当钢筋混凝土结构采用能量设计原则较传统的强度设计原则时,更加合理且更易保证结构的延性,从而有利于提高结构的抗震性能.In order to investigate the bond failure （BF） mechanism between all-lightweight concrete （AL- WC） and hot rolled crescent-shaped bars （HRCSB, hereinafter referred to as crescent-shaped bars （CSB）, or crescent ribbed bars （CRB）） and hot rolled plain steel bars （HRPSB, hereinafter referred to as plain steel bars （PSB））, respectively; the pullout tests are carried out and analyzed by energy analysis. The results show there are only splitting failure （SF） and pullout failure （POF）. But pullout failure is only caused by PSB. The contribution to energy consumption of CSB is far larger than that of PSB for bond failure. The energy mechanism of BF for ALWC is in general accord with normal weight concrete （NWC）, and includes mainly two types of energy dissipation and energy release. But the sudden change of W-S （en- ergy to displacement） curve for ALWC is more gentle than that for NWC; and the break point is also ahead. The energy contribution of the specimen which the diameter of bar （d） is 16mm or 20mm caused by SF, than that of d is 12mm caused by pullout failure, is only 19.7% and 30% respectively. It is shown that the design principle of reinforced concrete structure with energy analysis will be better than that by traditional strength design principle, also can help to improve the ductility and aseismic performance of structures.

关 键 词：全轻混凝土 月牙肋钢筋 粘结破坏 拉拔力-位移曲线 总能耗-位移曲线 

分 类 号：TU528.2[建筑科学—建筑技术科学] O312.3[理学—一般力学与力学基础]