工程力学 ›› 2020, Vol. 37 ›› Issue (5): 249-256.doi: 10.6052/j.issn.1000-4750.2019.09.0535

• 土木工程学科 • 上一篇    

分离式叠合板组合梁抗火性能研究与数值分析

吕俊利1,2, 吕京京1, 蔡永远1, 仲崇强1   

  1. 1. 山东建筑大学土木工程学院, 济南 250101;
    2. 建筑结构加固改造与地下空间工程教育部重点实验室, 济南 250101
  • 收稿日期:2019-09-17 修回日期:2019-12-12 出版日期:2020-05-25 发布日期:2019-12-27
  • 通讯作者: 吕俊利(1978-),男,山东人,副教授,博士,主要从事结构抗火研究(E-mail:ljl1978@163.com). E-mail:ljl1978@163.com
  • 作者简介:吕京京(1994-),男,山东人,硕士生,主要从事结构抗火研究(E-mail:598193660@qq.com);蔡永远(1994-),男,山东人,硕士生,主要从事结构抗火研究(E-mail:1194586183@qq.com);仲崇强(1994-),男,山东人,硕士生,主要从事结构抗火研究(E-mail:569968512@qq.com).
  • 基金资助:
    国家自然科学基金面上项目(51878398)

RESEARCH AND NUMERICAL ANALYSIS ON FIRE-RESISTANCE PERFORMANCE OF SEPARATED COMPOSITE BEAMS WITH LAMINATED SLAB

Lü Jun-li1,2, Lü Jing-jing1, CAI Yong-yuan1, ZHONG Chong-qiang1   

  1. 1. School of Civil Engineer, Shandong jianzhu University, Jinan 250101, China;
    2. Key Lab of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University), Ministry of Education, Jinan 250101, China
  • Received:2019-09-17 Revised:2019-12-12 Online:2020-05-25 Published:2019-12-27

摘要: 为了研究分离式叠合板组合梁的火灾行为,对四块足尺分离式叠合板组合梁进行了均布荷载作用下的火灾试验。考虑了栓钉间距、后浇层厚度、预制板在钢梁上翼缘搭接长度的影响因素,研究了组合梁在受火过程中沿板厚混凝土温度场分布规律、混凝土板中钢筋温度、沿钢梁高度温度场分布规律、抗弯刚度以及叠合板与钢梁的整体工作性。并利用ABAQUS对叠合板组合梁在热力耦合作用下的温度场和变形行为进行了数值模拟分析。结果表明:升温过程中,后浇层与预制底板结合界面未发生明显破坏,仍能共同承受荷载;但由于结合界面和预制板拼缝的存在,组合梁的整体抗弯刚度明显降低;热力耦合作用下,预制板在钢梁上翼缘搭接长度对组合梁的变形能力影响显著;对比试验研究结果与数值分析结果,二者吻合良好,验证了数值分析模型的有效性与可行性。

关键词: 分离式叠合板组合梁, 火灾试验, 数值模拟, 结合界面, 整体工作性

Abstract: In order to study the fire behavior of separated composite beams with laminated slabs, fire tests of four full-scale separated composite beams with laminated slabs under uniform loads were carried out. The considered influence factors included stud spacing, post-pouring layer thickness and overlap length between prefabricated slab and upper flange of steel beam. The temperature distribution of concrete along slab thickness, steel bar temperature, temperature field along the height of steel beam, bending stiffness and overall workability of composite slab and steel beam were studied. The temperature field and deformation behavior of the separated composite beams with laminated slabs under thermal-mechanical coupling were analyzed by ABAQUS. The results indicate that the bonding interface between the post-poured layer and the prefabricated floor is destroyed obviously during the heating process, but the loading capacity still exists. The overall bending stiffness of the composite beam decreases obviously due to the existence of the bonding interface and the joint of prefabricated slabs. Lap length has a significant influence on the deformation ability of composite beams with thermal-mechanical coupling effect. The experiment results are in good agreement with the numerical analysis results, so the validity and feasibility of the model are verified.

Key words: separated composite beam with laminated slab, fire test, numerical analysis, bonding interface, overall workability

中图分类号: 

  • TU398.9
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