Nghiên cứu ảnh hưởng của bê tông và hàm lượng cốt thép đến khả năng kháng nứt của sàn panel ba lớp=The study on the influence of concrete and reinforcement content on the crack resistance of three-layer panel slab

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Tác giả: Ngọc Lan Lê, Thị Thanh Tâm Nguyễn, Thị Hiền Phạm, Tuấn Anh Phạm, Đình Thơ Vũ, Thị Hương Lan Vũ

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Xây dựng, 2024

Mô tả vật lý: tr.98

Bộ sưu tập: Metadata

ID: 485182

Thêm vào giỏ

Sàn panel bê tông cốt thép ba lớp với lớp giữa từvật liệu dẫn nhiệt thấp và lớp ngoài làm từ vật liệu bê tông chịu lực đang dần trở thành kết cấu triển vọng sử dụng làm kết cấu bao che trong công trình xây dựng. Sự làm việc của kết cấu bê tông cốt thép ba lớp sử dụng các loại bê tông khác loại dưới tác dụng của tải trọng bị ảnh nhiều từ các lớp vật liệu khác loại và cốt thép sử dụng. Trong bài báo này, nhóm tác giả nghiên cứu về sự ảnh hưởng của tỷ lệ mô đun đàn hồi giữa hai lớp bê tông khác loại của lớp trong, lớp ngoài và hàm lượng cốt thép sử dụng đến khảnăngkhángnứt của kết cấu sàn panel bê tông cốt thép ba lớp dưới tác dụng của tải trọng. Phương pháp nghiên cứu được sử dụng bằng việc quy đổi tiết diện ngang của kết cấu nhiều lớp vật liệu về một loại vật liệu đồng nhất trên cơ sở tỷ lệ mô đun đàn hồi giữa các lớp vật liệu, và sửdụng phương pháp và công thức được trình bày trong tiêu chuẩn Việt Nam 5574-2018. Kết quả nghiên cứu chỉ ra rằng: tỷ lệ mô đun đàn hồi của bê tông lớp trong, lớp ngoài và hàm lượng cốt thép sử dụng trong sàn panel ba lớp ảnh hướng lớn đến khả năng kháng nứt và độ võng của kết cấu này dưới tác dụng của tải trọng. Khi tỷ lệ mô đun đàn hồi bê tông giữa lớp trong và lớp ngoài của kết cấu sàn càng tăng thì khảnăng kháng nứt của sàn càng tăng, độvõng của sàn nhiều lớp càng giảm. Trong sàn panel ba lớp được khảo sát, sự thay đổi tỷ lệ mô đun đàn hồi giữa bê tông nhẹ ở lớp trong và bê tông chịu lực ở lớp ngoài làm thay đổi khả năng kháng nứt của sàn nhiều hơn ảnh hưởng của sự thay đổi hàm lượng cốt thép trong sàn. Kết quả nghiên cứu giúp các nhà thiết kế kết cấu sàn panel ba lớp lựa chọn được các tham số hợp lý và phù hợp với yêu cầu kháng nứt cho sàn. Từ khóa: Kết cấu bê tông cốt thép nhiều lớp
bê tông nhẹ
bê tông dẫn nhiệt thấp
bê tông xốpThree-layer reinforced concrete panel slabs with a middle layer made of low thermal conductivity materials and outer layers made of load-bearing concrete materials are gradually becoming a promising structure for use as enclosure systems in construction projects. The behavior of the three-layer reinforced concrete structure using different types of concrete under the influence of loads is significantly affected by the interaction between the different material layers and the reinforcement used. In this paper, the authors investigate the effect of the elastic modulus ratio between the two different types of concrete in the inner and outer layers, as well as the steel reinforcement content, on the cracking resistance of the three-layer reinforced concrete panel slab under load. The research method involves converting the cross-sectional area of the multilayer material structure into a homogeneous material based on the elastic modulus ratio between the material layers and applying the methods and formulas outlined in the Vietnamese Standard 5574-2018. The research results show that: the elastic modulus ratio of the concrete in the inner and outer layers, and the steel reinforcement content used in the three-layer panel slab, significantly affect the cracking resistance and deflection of the structure under load. As the elastic modulus ratio between the inner and outer concrete layers increases, the cracking resistance of the slab improves, and the deflection of the multilayer slabdecreases. In the three-layer panel slab investigated, the change in the elastic modulus ratio between the lightweight concrete in the inner layer and the loadbearing concrete in the outer layer has a greater impact on the cracking resistance of the slab than the change in the steel reinforcement content. The research results help designers of three-layer panel slabs select appropriate parameters that meet the cracking resistance requirements for the slab. Keywords: Multi-layer reinforced concrete structures
lightweight concrete
low thermal conductivity concrete polystyrene concrete.

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