钢结构井架动力特性测试分析与提高承载力研究  

Test and analysis of dynamic characteristics and enhanced bearing capacity of steel headframes

作　　者：于广云[1] 葛新辉[1] 李宏波[1] 王伯平[1] 

机构地区：[1]中国矿业大学,江苏徐州221008

出　　处：《土木工程学报》2006年第6期61-65,共5页China Civil Engineering Journal

摘　　要：由于煤矿主井井架提升能力的增加,引起井架杆件受力增大,受迫振动频率增大,导致安全性能降低。针对该井架具体情况,采用增大杆件截面的方法对其进行了加固。应用SAP2000有限元软件,建立三维有限元模型,对其自振特性和加固前后的杆件应力进行了对比分析,加固后杆件最大应力大大降低;通过加固前后不同荷载下的动力测试,对加固后井架的运行状况作出评估与分析,在原提升荷载和新提升荷载下,井架工作时平均振动频率都有很大幅度的减小。有限元计算和现场测试表明,井架加固后使安全性能大大提高,采用增大截面的方法可以提高钢结构井架的承载力。The safety of a main well headframe would be reduced significantly, due to increased loading capacity and higher vibration frequency in a coalmine. In order to alleviate this problem, the headframe was strengthened by using structural members with larger cross sectional areas. A finite element model using the structural analysis software, SAP2000, was created to study the headframe＇s natural vibration characteristics and the state of member forces. It was found that member forces are significantly reduced after the reinforcement of structural members. In addition, dynamic test was performed on the headframe before and after reinforcements under different loads. Based on the dynamic test, an evaluation and analysis of the actual state of the strengthened headframe was obtained. According to the measured data from the dynamic test and the calculated results, the safety of the headframe was greatly improved, indicating that by enlarging the members＇ cross-sections it can indeed increase the bearing capacity of the headframe.

关 键 词：钢结构井架 增大截面 有限元 动力测试 

分 类 号：TU391[建筑科学—结构工程]