格构式钢柱组合式塔吊基础的设计与分析

Design and Analysis of Composite Tower Crane Foundation with Lattice Steel Column

基于某文化广场由于施工故障所导致的废弃桩基基础,考虑多种影响因素及参考一般的塔吊基础进行了进一步的设计,而后通过有限元专业软件对其进行了数值建模,从结构设计理念、自振周期、应力比、位移等方面对格构式钢柱进行了强度和变形分析。由分析结果可知:结构的第一阶自振周期为1.956 s,结构构件的最大应力比为0.802,绝大多数构件应力比控制不超过0.7;在工况1及工况3组合作用下,整体结构的最大水平位移发生在格构钢立柱的顶端,最大水平位移值为8.2 mm,在工况3单独作用下,整体结构的最大水平位移发生在格构钢立柱的顶端,最大水平位移值为11.8mm。均小于规范要求,满足设计要求,结构设计合理。既保留了原始桩基又解决了现有问题,且设计的格构式钢柱组合式塔吊基础安全,可供类似工程借鉴。

Based on the abandoned pile foundation caused by construction failure in a culture square,the foundation of composite tower crane with lattice steel column is further designed by considering many influencing factors and referring to the general tower crane foundation,which is accurately numerically modeled by finite element professional software.The strength and deformation of lattice steel columns are analyzed from the aspects of structural design concept,natural vibration period,stress ratio,displacement and so on.It is known from the analysis results that the first natural vibration period of the structure is 1.956s,the maximum stress ratio of structural members is 0.802,and the stress ratio of most members is less than 0.70.Under the combined action of case 1 and case 3,the maximum horizontal displacement of the whole structure occurs at the top of the lattice steel column,and the maximum horizontal displacement is 8.2mm.Under the action of case 3 alone,the maximum horizontal displacement of the whole structure occurs at the top of the lattice steel column,and the maximum horizontal displacement is 11.8mm.All of them are less than the specified requirements,meet the design requirements,and the structural design is reasonable.It not only retains the original pile foundation but also solves the existing problems,and the designed composite tower crane foundation with lattice steel column is safe,which can be used as a reference for similar projects.