吕俊利, 吕京京, 蔡永远, 仲崇强. 分离式叠合板组合梁抗火性能研究与数值分析[J]. 工程力学, 2020, 37(5): 249-256. DOI: 10.6052/j.issn.1000-4750.2019.09.0535
引用本文: 吕俊利, 吕京京, 蔡永远, 仲崇强. 分离式叠合板组合梁抗火性能研究与数值分析[J]. 工程力学, 2020, 37(5): 249-256. DOI: 10.6052/j.issn.1000-4750.2019.09.0535
LÜ Jun-li, LÜ Jing-jing, CAI Yong-yuan, ZHONG Chong-qiang. RESEARCH AND NUMERICAL ANALYSIS ON FIRE-RESISTANCE PERFORMANCE OF SEPARATED COMPOSITE BEAMS WITH LAMINATED SLAB[J]. Engineering Mechanics, 2020, 37(5): 249-256. DOI: 10.6052/j.issn.1000-4750.2019.09.0535
Citation: LÜ Jun-li, LÜ Jing-jing, CAI Yong-yuan, ZHONG Chong-qiang. RESEARCH AND NUMERICAL ANALYSIS ON FIRE-RESISTANCE PERFORMANCE OF SEPARATED COMPOSITE BEAMS WITH LAMINATED SLAB[J]. Engineering Mechanics, 2020, 37(5): 249-256. DOI: 10.6052/j.issn.1000-4750.2019.09.0535

分离式叠合板组合梁抗火性能研究与数值分析

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

  • 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。

     

    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.

     

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