钢管约束下轻集料混凝土的紧箍效应及强度准则  

Confinement Effect and Strength Criterion of Lightweight Aggregate Concrete Confined By Steel Tube

作　　者：吉伯海[1] 杨明[2] 陈甲树[1] 周文杰[1] 

机构地区：[1]河海大学,江苏南京210098 [2]江苏省电力设计院,江苏南京210024

出　　处：《桥梁建设》2006年第4期11-14,共4页Bridge Construction

基　　金：国家技术研究发展计划(863计划)资助项目(2003AA601100);江苏省建设厅科研项目(JS2005ZD11)

摘　　要：通过钢管约束下核心轻集料混凝土的紧箍效应试验，得到核心混凝土在轴压作用下应力～变形关系曲线及试件破坏形态，重点对轻集料混凝土的紧箍效应及强度准则进行分析研究。试验和计算结果表明，在钢管的约束作用下，轻集料混凝土的延性和强度显著提高，但紧箍效应比普通混凝土小。根据试验结果建立了三向受压轻集料混凝土的强度准则。Through experimental investigation of confinement effect of core lightweight ag- gregate concrete （LWAC） confined by steel tube, the stress-strain relations of the core LWAC under axial compression and failure modes of the specimens thereof are obtained, and the confinement effect and strength criterion of the LWAC are then analytically studied in details. The results of the experimental investigation and calculation reveal that the ductility and strength of the LWAC confined by steel tube are significantly improved, however the confinement effect of the LWAC is smaller than that of the normal concrete. In accordance with the experimental investigation results, the strength criterion of the LWAC under triaxial compression is established.

关 键 词：钢管混凝土 轻集料混凝土 紧箍效应 强度准则 

分 类 号：U448.38[建筑科学—桥梁与隧道工程]