开敞式防洪闸闸室结构抗震安全分析及加固措施研究

Seismic Safety Analysis and Reinforcement Measures Research of Open Floodgate Chamber Structure

以处于地震基本烈度8度区的某开敞式防洪闸为例,基于有限元分析软件,采用时程分析法对闸室结构抗震能力进行了分析。针对闸室上部启闭机房结构存在的抗震缺陷,制定了不同的抗震加固方案,通过不同加固方案抗震能力对比分析,比选了较优加固方案,并在较优方案基础上,探究了连通梁截面尺寸对闸室结构加固效果的内在影响规律。结果表明:地震作用下防洪闸闸室结构启闭机房排架柱折角位置处出现较大拉应力区,其最大拉应力超过了结构承载能力,不满足抗震安全需求;在各排架柱之间增设连通梁可降低启闭机房结构动力响应,但设计过程中为避免启闭机房结构产生鞭梢效应,不宜在顶部位置增设;连通梁截面尺寸对启闭机房排架柱结构抗震能力影响显著,实际工程中可通过控制截面尺寸达到理想的抗震加固效果。

Taking an open flood control gate located in the VIII degree area of the basic seismic intensity as an example and based on ADINA finite element analysis software,the seismic capacity of the gate chamber structure was analyzed by the time history analysis method.Aiming at the aseismic defects of the upper hoist room structure of the gate chamber,different aseismic reinforcement schemes were formulated.Through the comparison and analysis of the aseismic capacity of different reinforcement schemes,the better reinforcement scheme was select-ed.On the basis of the better scheme,the internal influence law of the section size on the reinforcement effect of the gate chamber structure was explored.The results show that there is a large tensile stress area at the bent angle of the hoist room bent column of the flood gate cham-ber structure under the earthquake action,and the maximum tensile stress value exceeds the bearing capacity of the structure,which does not meet the seismic safety requirements.The addition of connecting beams between each bent column can reduce the dynamic response of the hoist room structure,however,it should not be added at the top in the design process to avoid whiplash effect in the hoist room structure.The section size of the connecting beam has a significant influence on the seismic capacity of the bent column structure of the hoist room.In the actual project,the ideal seismic reinforcement effect can be achieved by controlling the section size.