大型火力发电厂钢筋混凝土框排架主厂房结构抗震性能试验研究

对按照《建筑抗震设计规范》(GBJ 11—89)设计并已投产使用的某大型火力发电厂钢筋混凝土主厂房框排架结构抗震性能进行研究,进行1/7比例含有三跨三榀五层框排架子空间模型抗震性能拟动力和伪静力试验。研究分析表明:该类不规则结构裂缝分布广泛,由于整体结构“强梁弱柱”的特点,最终破坏塑性铰主要在柱上。破坏最严重的是原型结构的第5层,主要由于该处柱变截面及变梁变柱异形节点存在。模型结构在峰值加速度0.05g地震波作用下,满足“小震不坏”的要求;在峰值加速度0.30g地震波作用下,满足“大震不倒”的设防要求。表明按《建筑抗震设计规范》(GBJ 11—89)设计的钢筋混凝土框排架可满足7度抗震设防要求,但在抗震设防更高烈度地区应用应慎重。

Experimental study on seismic behavior of RC frame-bent structure of a large-scale power plant

An investigation on seismic behavior of main structures in a large-scale thermal plant is reported in this paper.The structure was design for similar requirements in accordance with the GBJ11—89,and their 1∶7 scaled models were subjected to pseudo-dynamic and pseudo-static loadings.Experimental results show that structure exhibited a rather uniformly distributed cracking pattern.Plastic hinges appeared to also occur in several columns,and this may be attributed to the "strong beam and soft column".The severe damage at the fifth story of prototype is attributable to the abrupt reduction of the column cross section size and abnormal joints effects.The model structure under the 0.05g the earthquake acceleration did not crack,and was able to sustain without collapse under the 0.30g acceleration ground motion input.The test results indicate that the structure satisfied the demand of seismic design in 7 intensity zones,but the safety margin of the structure was limited.Therefore,the application of this type of structure in the zones with higher seismic intensity should be caution.