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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 explore the bond failure mechanism between steel bar and light concrete, the pull-out tests conducted with full-light concrete, polished steel bars, and crescent-ribbed bars found that the bond failures were only splitting and pull-out damage; however, The optical steel bar only has pullout damage, and the contribution rate of the energy consumption of the crescent rib rebar to the bond failure is much greater than that of the light circle rebar. Second, the energy mechanism of the full-light concrete and the steel bar is basically the same as that of the ordinary concrete, and the energy consumption is basically equal. The two types of dispersion and energy release are dominated; however, the former’s total energy-displacement (WS) curve has a more abrupt change, and the mutation point is also advanced. According to the test when the splitting failure occurs and the steel bar diameter d is 16 and 20 mm. Compared with the latter, the total energy consumption is only 19.7% and 30% of the latter, compared with the case where the pull-out failure occurs and the d is 12mm, which further shows that when the reinforced concrete structure adopts the energy design principle more traditional strength design principles , More reasonable and easier to ensure the ductility of the structure, which helps to improve the seismic performance of the structure.