箱板式钢结构住宅模块单元受力机理的有限元分析

FINITE ELEMENT ANALYSIS OF STRESS MECHANISM OF BOX-TYPE STEEL STRUCTURE RESIDENTIAL MODULAR UNIT

箱板式钢结构是一种新型装配式结构体系,其借鉴了船舶上层建筑的设计理念。采用数值方法对两层箱板式钢结构住宅模块单元在水平单调荷载作用下的破坏机理及其极限承载力进行研究,提出模块单元角部加强的措施,分析了墙板高厚比、扶强材与墙板截面模量比以及墙板所受竖向荷载F与受压墙板截面总面积A和材料屈服应力fy乘积之比(F/(Afy))等关键参数对角部加强后模块单元极限承载力的影响,分析证明扶强材提高了角部加强后模块单元极限承载力,扶强材的破坏导致模块单元承载力急剧下降,截面模量比越大,下降段越缓慢。另外,在低周往复荷载作用下,对比了角部加强前后模块单元的滞回性能,同时也对比了角部加强后去掉与未去掉扶强材的模块单元的滞回性能,通过分析表明,角部加强措施能提高模块单元极限承载力,且显著改善模块单元的耗能能力。

Box-type steel structure is a new type of assembly structure system applying the design concept of ship superstructure. The paper presented the failure mechanism and ultimate bearing capacity of two-story box-type steel structure residential modular unit under horizontal monotonic loading by numerical method,put forward the measures to strengthen the module unit corner,analyzed the influence of depth-thickness ratio of the wallboard,the modular ratio of stiffener and wallboard section and the ratio of vertical load on wallboard to the product of the total area of the wallboard and the yield stress on the ultimate bearing capacity of the modular unit. The results showed that the ultimate bearing capacity of modular unit was improved by the stiffeners after the corner was reinforced. The damage of stiffeners could result in a decrease in bearing capacity. It was found that the larger the section modulus ratio,the slower the decline. In addition,under quasi-static loading,the paper compared the hysteretic behavior of modular units before and after the strengthening of corner areas; it also compared the hysteretic behavior of the modular units before and after removing the stiffeners. The results indicated that corner reinforcement measures could significantly improve the ultimate bearing capacity of modular units and the energy dissipation capacity of modular units.