新型预应力杆的临界承载力  

THE CRITICAL COMPRESSIVE BEARING CAPACITY OF NEW TYPE PRESTRESSED STRUT

作　　者：袁鑫 

机构地区：[1]上海同基钢结构技术有限公司,上海201100

出　　处：《工业建筑》2017年第4期152-158,共7页Industrial Construction

摘　　要：通过给外管和内杆施加大小相等、方向相反的自平衡预应力,将两者装配成自预应力超大长细比套管柱(简称"S柱"),对其进行理论分析和试验研究。研究发现其失稳模式为高阶屈曲,并得出其临界承载力远超过相同外形尺寸、材质和边界条件的欧拉柱。"S柱"受外压力时,外管在工作全过程中为内杆提供侧向恢复力,使得"S柱"整体呈现多半波失稳的形态,受压承载力可大幅度提高到欧拉临界力的120倍以上,进而可做到由材料强度控制。Two equal and opposite self-balanced prestressing force were applied to the outer tube and the core bar to assemble self-prestressed casing string with super-large slenderness ratio（S-column）. Through the theoretical analysis and experimental study, the results showed that the failure mode of S-column was higher-order buckling, and its ultimate compressive capacity reached more than that of Euler column with same size and boundary conditions. The outer tube could provide lateral restoring force for the inner core bar when the S-column was subjected to external pressure, which might lead to multiple half-wave buckling for S-column, and the compressive bearing capacity could be greatly increased to more than 120 times that of Euler by material strength control.

关 键 词：大长细比 自应力 多波屈曲 稳定 临界力 

分 类 号：TU394[建筑科学—结构工程]