门式刚架轻钢厂房不均匀沉降原因及影响分析

Impact Analysis of Light- weight Steel Structure with Portal Frames Uneven Settlement

建筑场地内用不同方法处理软土地基会导致基础产生不均匀沉降,使结构产生附加内力.本文结合某带轻型吊车的大型门式刚架单层厂房柱沉降观测数据,分析沉降产生的原因,运用ANSYS建立结构的整体模型,考虑空间作用计算不同沉降差对结构附加内力的影响.结果表明,柱沉降差在规范限值内,附加内力可忽略;当沉降差接近限值,设计中宜考虑附加内力影响.

Foundation was produced to uneven settlement due to the use of different treatment methods in a soft ground construction site. Thus,the structure is easy to generate additional internal forces. Situation of the observed column settlement for a single portal frame structure with light crane loading was presented,and the reasons of uneven column settlement was studied as well. Besides,the global model structure was established in ANSYS,and additional internal forces on structure caused by various settlement differences were calculated with the spatial effect considered. It ＇s concluded that the column settlement differences are within the specification limits,and additional internal forces can be ignored; Complementally,additional internal forces are appropriate to be counted if the settlement difference is just near the limit of design code.