预应力SRC梁截面受弯承载力实用设计方法研究  

Study on practical design method of flexural capacity for prestressed SRC beam members

作　　者：姚刚峰 熊学玉[2] Yao Gangfeng;Xiong Xueyu(Jiangsu Key Laboratory of Structural Engineering,Suzhou University of Science and Technology,Suzhou 215011,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]苏州科技大学江苏省结构工程重点实验室,江苏苏州215011 [2]同济大学土木工程学院,上海200092

出　　处：《建筑科学》2023年第11期97-104,共8页Building Science

基　　金：国家自然科学基金项目(51578400);江苏省结构工程重点实验室开放课题(ZD2205)。

摘　　要：为获得简便、精确的预应力型钢混凝土(PSRC)截面受弯承载力解析计算方法,参考国内外有关型钢混凝土结构的规范准则,给出了两种针对PSRC受弯构件的实用方法,包括叠加法和截面塑性应力分布法。首先,利用收集的35个PSRC简支梁试验数据,对包括预应力规范方法(方法1)、叠加法(方法2)和截面塑性应力分布法(方法3)在内的3种方法的适用性进行初步研究。经分析发现,方法1与方法3均具有较高计算精度,计算与实测极限弯矩比值(Mu,c/Mu,t)的平均值皆为0.96,但方法1的适用范围具有局限性;方法2计算结果则整体偏低,Mu,c/Mu,t的均值为0.84。设计参数方面,混凝土强度及是否设置栓钉对各方法计算精度的影响最显著。其次,利用OpenSEES数值模型深入研究了截面中性轴位置的影响,可知中性轴位置对方法1和方法3精度的影响基本可忽略,而方法2计算精度则随中性轴的升高而明显降低。To achieve the convenient and accurate calculation method to predict the flexural capacity of prestressed steel reinforced concrete(PSRC)members,two practical methods are provided based on the design codes for steel reinforced concrete structures domestic and overseas,including the superposition method and plastic stress distribution method.Firstly,the usability of three methods,including the method from code JGJ 369-2016(Method 1),superposition method(Method 2)and plastic stress distribution method(Method 3),are investigated by the test data from 35 PSRC simply-supported beams.Both Method 1 and Method 2 are able to provide an accurate prediction with the same mean predict-to-test moment ratios of 0.96.However,the applicability of Method 1 could be relatively limited.Besides,the calculation results by Method 2 are generally conservative with a mean predict-to-test moment ratio of 0.84.Accuracies of the three methods are influenced by the concrete strength and shear anchors of specimens.Furtherly,the effects of position of neutral axis are studied using the numerical model by OpenSEES.The results show that the influences of neutral axis position on the accuracies of Method 1 and Method 3 are negligible,while the accuracy of Method 2 will decrease as the rise of neutral axis position.

关 键 词：预应力型钢混凝土 受弯承载力 实用方法 中性轴 适用性 

分 类 号：TU398.9[建筑科学—结构工程] TU311.41