本文選題：預應力(PC)鋼棒 + 火災試驗　； 參考：《建筑結(jié)構(gòu)學報》2014年03期

【摘要】：為研究火災作用下錨具對預應力(PC)鋼棒錨固性能退化規(guī)律,完成65組由JXM型錨具、混凝土塊、抗拉強度標準值為970 MPa的7高強PC鋼棒及反力架組成的預應力錨固系統(tǒng)高溫性能試驗,其中29組為裸露錨具高溫瞬態(tài)試驗,18組為裸露錨具高溫穩(wěn)態(tài)試驗,18組為帶防火保護的錨具高溫瞬態(tài)試驗。研究PC鋼棒應力水平(0.2~0.7)、溫度(20~800℃)、防火保護措施(灌漿料封錨、涂抹防火涂料、灌漿料封錨后再涂抹防火涂料)和升溫速率(10.0、26.7℃/min)對錨固性能的影響。裸露錨具高溫瞬態(tài)試驗結(jié)果表明:高溫下錨固系統(tǒng)破壞模式為PC鋼棒在錨具中發(fā)生滑移;PC鋼棒的應力水平越高、溫度越高、升溫速率越大,錨固系統(tǒng)破壞時間越短。高溫穩(wěn)態(tài)試驗結(jié)果表明:溫度低于400℃時,錨固系統(tǒng)破壞模式為PC鋼棒被拉斷,溫度高于400℃時,破壞模式為PC鋼棒從錨具中滑移;高溫后錨具不能再使用。帶防火保護的高溫瞬態(tài)試驗結(jié)果表明:錨固系統(tǒng)破壞模式為PC鋼棒從錨具中滑移,防火保護不改變錨固系統(tǒng)的破壞模式;與無防火保護措施相比,三種保護措施下錨固系統(tǒng)破壞時間均提高100%以上;若將GB 14907—2002《鋼結(jié)構(gòu)防火涂料》關于鋼結(jié)構(gòu)防火涂料厚度的要求直接應用于預應力錨具防火,將偏于不安全。
[Abstract]:In order to study the degradation rule of anchoring performance of prestressed steel bars under fire, 65 groups of JXM anchors and concrete blocks were completed. High temperature performance test of prestressed Anchorage system composed of 7 high strength PC steel bar and counterforce frame with 970 MPa tensile strength standard value, Among them 29 groups were exposed Anchorage high temperature transient test and 18 groups were exposed Anchorage high temperature steady state test and 18 group were high temperature transient test with fire protection. The effects of stress level of PC steel bar (0.2o 0.7), temperature of 20 鈩，

本文編號：1900581