摘要
通过消压弯矩可以求得预应力混凝土梁截面下缘混凝土的有效预压应力、混凝土的抗拉强度、预应力筋的有效拉力和有效拉应力。提出通过加载至开裂并卸载再加载的方法,获得消压弯矩试验值及其他相关参数,所得试验结果与计算结果相吻合。研究表明:提出的消压弯矩试验方法是可行的,截面非对称的预应力混凝土梁在加载弯矩作用下的开裂是一个过程,可以通过应变与加载弯矩的关系曲线推求得到初裂弯矩、全截面的开裂弯矩和消压弯矩,通过布置连续应变片可以找出开裂的具体位置。
The effective pre-compression stress,tensile strength of bottom concrete and the effective tensile force,effective tensile stress of pre-stressed bar can be obtained from decompression moment of the pre-stressed concrete beam.A method of loading to cracking then unloading and reloading was presented to obtain the decompression moment and other relevant parameters.The experimental results agree reasonably well with the theoretical results.The investigation shows that the presented method for decompression moment is feasible,and the cracking of the pre-stressed concrete beam with asymmetric section under loading moment is a procedure.The initial cracking moment,cracking moment of the full section and the decompression moment can be obtained from the relationship of strain and loading moment.The position of cracking can be found with the help of continuously arranged strain gauge.
出处
《建筑结构》
CSCD
北大核心
2012年第7期64-67,共4页
Building Structure
关键词
消压弯矩
预应力混凝土梁
有效预压应力
开裂弯矩
decompression moment
pre-stressed concrete beam
effective pre-compression stress
cracking moment
