基坑工程中钢支撑预加力计算方法探讨  

Discussion on Calculation Method of Steel Support Prestressing Force in Foundation Pit Project

作　　者：颜荣华[1] 刘帆 郭玉君[1] 戴郑新 YAN Ronghua;LIU Fan;GUO Yujun;DAI Zhengxin(Jiangsu Nanjing Institute of Geo-engineering Investigation,Nanjing Jiangsu 210041 China)

机构地区：[1]江苏南京地质工程勘察院,江苏南京210041

出　　处：《江苏建筑》2024年第3期143-145,共3页Jiangsu Construction

摘　　要：根据工程经验,钢支撑预加力一般取支撑轴向压力标准值的0.5~0.8倍。但是,支撑轴向压力标准值是未知数,一般计算时需通过迭代的方式确定预加力。该方法计算过程复杂,且有两个支撑轴向压力标准值,实际施工过程中到底施加多大的预加力存在较大的争议。为此,通过理论分析,将预加力作用下的支撑轴力等效为刚度增大的无预加力情况下的支撑轴力,可直接计算出支撑轴向压力标准值并确定钢支撑预加力的大小。最后通过某工程实例,与传统迭代的方法进行了对比,认为修正后的预加力计算方法简单方便、结果可靠。According to engineering experience,the steel support prestressing force is 0.5~0.8 times of the standard value of axial pressure.However,the support axial pressure standard value is unknown,and general calculation of the prestressing force is determined by using iterative method.But the calculation process is complex,and there are two brace axial pressure standard values.So there is a big controversy about the standards of the prestressing force in the construction process.Therefore,through theoretical analysis,the axial force in prestress can equivalent to the axial force of a stiffness increases but without prestressing force,it can be calculated directly to support axial pressure standard value and the steel support prestressing force.Finally,through a project example,compared with the iterative method,it is considered that the prestressing force calculation method modified is simple and convenient,and the results are reliable.

关 键 词：钢支撑 预加力 基坑工程 计算方法 

分 类 号：TU470.3[建筑科学—结构工程]