\r张锡治^{1, 2}，章少华³，牛四欣³，王湘安\r¹\r
\r
AuthorsHTML:\r张锡治^{1, 2}，章少华³，牛四欣³，王湘安\r¹\r
\r
AuthorsListE:\rZhang Xizhi^{1, 2}，Zhang Shaohua³，Niu Sixin³，Wang Xiang’an\r¹\r
\r
AuthorsHTMLE:\rZhang Xizhi^{1, 2}，Zhang Shaohua³，Niu Sixin³，Wang Xiang’an\r¹\r
\r
Unit:\r1. 天津大学建筑设计研究院，天津 300072；
2. 滨海土木工程结构与安全教育部重点实验室(天津大学)，天津 300072；
3. 天津大学建筑工程学院，天津 300072\r
\r
Unit_EngLish:\r1. Architechtural Design and Research Institute of Tianjin University，Tianjin 300072，China；
2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education(Tianjin University)，Tianjin 300072，China；
3. School of Civil Engineering，Tianjin University，Tianjin 300072，China\r
\r
Abstract_Chinese:\r\r为研究两端固支边界条件下钢\r-\r混凝土预制混合梁\r(\r简称预制混合梁\r)\r的受弯性能，以钢梁长度、受弯承载力比和线刚度比为主要参数，进行了\r4\r个预制混合梁和\r1\r个普通预制混凝土梁试件的静力加载试验，研究了各试件的破坏模式、承载力、刚度、延性、挠度曲线和应变分布等．试验结果表明：所有试件均发生受弯破坏，其中预制混合梁的受弯破坏有两种模式，一是中部混凝土梁端和跨中截面形成塑性铰，二是梁端钢梁截面和跨中混凝土梁截面形成塑性铰．预制混合梁表现出良好的整体工作性能，连接节点在受力过程中始终保持较好的整体性\r．\r基于连接节点假定为刚性节点的应变分析结果与试验结果吻合较好，连接节点能有效传递钢梁和混凝土梁之间的应力，可视为刚性节点．钢梁长度、受弯承载力比和线刚度比的增加均可提高预制混合梁的承载力和延性，其中增加受弯承载力比的效果更显著．与普通预制混凝土梁相比，预制混合梁的初始刚度小，跨中挠度大，但其强屈比较普通预制混凝土梁提高约\r4\r%\r～\r15\r%\r，预制混合梁具有更好的屈服后弹塑性变形能力，有利于耗能．最后，基于虚功原理建立了两端固支边界条件下预制混合梁的极限荷载计算式，计算值与试验值比值的平均值为\r1.0\r，变异系数为\r0.04\r，计算值与试验值吻合较好．\r\r
\r
Abstract_English:\r\rTo study the flexural behavior of precast hybrid steel-concrete\r(\rPHSC\r)\rbeams with fixed ends\r，\rwe conducted an experiment using four PHSC beams and a precast concrete\r(\rPC\r)\rbeam as specimens under static load. The steel beams had different lengths\r，\rbending bearing capacity ratios\r，\rand line stiffness ratios\r，\rand we investigated the failure modes\r，\rbearing capacity\r，\rstiffness\r，\rductility\r，\rdeflection curves\r，\rand strain distribution of all the specimens. The test results indicate that the failure modes of the specimens were dominated by the flexure. We observed two flexural failure modes in the PHSC beams. In the first\r，\rplastic hinges formed at the end and mid-span of the concrete beam\r，\rand in the second\r，\rplastic hinges formed at the end of the steel beam and mid-span of the concrete beam. The PHSC beam exhibited good integral working behavior\r，\rand the steel-concrete connection joints maintained good integrity during the loading process. The strain analysis results based on the assumption of rigid joint connections were in good agreement with the test results. Hence\r，\rthe joint used to connect steel and concrete beams can be considered to be a rigid joint that can effectively transfer force between different members. Furthermore\r，\rboth the bearing capacity and ductility of the PHSC beam can be improved by increasing the steel beam length\r，\rbending bearing capacity ratio\r，\rand line stiffness ratio\r，\rwith the effect of the bending bearing capacity ratio being more pronounced. Compared with the PC beam\r，\rthe PHSC beam has less initial stiffness and a larger mid-span deflection\r，\rbut the ratio of the maximum load to yield load in the PHSC beams was increased by approximately 4\r%\r—\r15\r%\r. The PHSC beam has better plastic deformation capacity after yield\r，\rwhich is beneficial to overall energy consumption. Lastly\r，\rwe propose an ultimate load formula for PHSC beams with fixed ends based on the virtual work principle. The average ratio of the calculated value to the test value was 1.0\r，\rand the coefficient of variation was 0.04\r，\rwhich confirms that the calculated values agree well with the test values.\r\r
\r
Keyword_Chinese:钢-混凝土预制混合梁；钢-混凝土连接节点；静力试验；受弯性能；极限荷载\r

Keywords_English:precast hybrid steel-concrete beam；steel-concrete connection joint；static test；flexural behavior；ultimate load\r


PDF全文下载地址:http://xbzrb.tju.edu.cn/#/digest?ArticleID=6438