现浇空心楼板中无粘结预应力钢绞线应力增量研究  

Investigation on stress increments of unbounded pre-stressed strands of cast-in-situ concrete hollow floor slabs

作　　者：刘昭清[1] 钱稼茹[2] 徐焱[2] 

机构地区：[1]西南交通大学土木工程系,成都610031 [2]清华大学结构工程与振动教育部重点实验室,北京100084

出　　处：《建筑结构》2013年第6期82-85,76,共5页Building Structure

摘　　要：为研究现浇空心楼板中无粘结预应力钢绞线的应力增量,对一块四边简支、净跨为8m×8m的现浇预应力混凝土空心楼板进行了抗弯试验和有限元分析,采用国内外规范公式计算了该试验板预应力钢绞线的极限应力增量。结果表明,有限元计算得到的荷载-预应力钢绞线应力增量关系与试验实测结果符合较好;规范JGJ 92—2004公式计算得到的预应力钢绞线极限应力增量不到试验实测值和有限元计算值的一半。建议空心楼板无粘结预应力钢绞线的极限应力增量可取JGJ 92—2004规定值的2倍。To study the stress increments of the unbounded pre-stressed strands,bending test and finite element analysis of a 8m×8m cast-in-situ pre-stressed concrete hollow slab with four edges supported simply were carried out.The ultimate stress increment of the unbounded strands of the test slab was calculated by design codes.The results show that the load-stress increment relationship of strands calculated by the finite element analysis agrees well with the test curve.The ultimate stress increment obtained by JGJ 92—2004 is less than half of the test value.It is recommended that the ultimate stress increment of unbounded pre-stress strands can be two times of the value specified by JGJ 92—2004.

关 键 词：现浇预应力混凝土 空心楼板 无粘结预应力钢绞线 应力增量 试验研究 

分 类 号：TU378[建筑科学—结构工程]