部分预应力钢-混凝土连续组合梁负弯矩区裂缝宽度试验研究  

Experimental study of crack width in negative bending region of partially prestressed continuous steel concrete composite beams

作　　者：余志武[1] 郭风琪[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《建筑结构学报》2004年第4期55-59,共5页Journal of Building Structures

基　　金：国家自然科学基金资助项目(59878007)。

摘　　要：本文根据18根部分预应力钢-混凝土组合梁负弯矩区的受力性能试验研究结果,探讨了负弯矩区裂缝产生与发展的规律。试验表明,影响裂缝宽度的主要因素为负弯矩区综合力比Rp、剪力连接件间距p和钢梁与混凝土板的相对高度比hs/hc:Rp和hs/hc越小,裂缝宽度越大;p越小,裂缝宽度越小。根据试验结果,本文建立了部分预应力钢-混凝土连续组合梁负弯矩区裂缝宽度的经验计算公式,形式上与现行的混凝土结构设计规范建议的受弯构件裂缝宽度计算公式统一。Based on experimental study of 18 partially prestressed continuous steel concrete composite beams , the laws of the crack formation and expansion in negative bending region were discussed . The test results indicated that major influencing factors on crack width included the combined force ratio Rp in negative bending region , spacing of shear connectors p and the relative height ratio of steel girder and concrete slab hs/hc. When Rp and hs/hc became small,the crack width increased. When p became small,the crack width decreased. The formulas for calculating crack width in negative bending region are presented , which coincide with the current code for design of concrete structures.

关 键 词：钢-混凝土组合梁 负弯矩区 预应力 裂缝宽度 

分 类 号：TU398.9[建筑科学—结构工程]