Ứng xử sàn bê tông cốt thép gia cường bằng vật liệu dán bề mặt FRP

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Tác giả: THỊ THANH NGUYỄN, VIỆT HÙNG PHẠM

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Xây dựng, 2023

Mô tả vật lý: tr.56

Bộ sưu tập: Metadata

ID: 341464

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Gia cường sàn bê tông cốt thép (BTCT) bằng vật liệu tổng hợp dán bề mặt FRP (Fiber Reinforced Polymer) được sử dụng phổ biến hiện nay. Tuy nhiên, do chưa có tiêu chuẩn thiết kế, thi công và nghiệm thu, đây là rào cản lớn trong việc áp dụng vật liệu đó vào thực tiễn tại Việt Nam. Bởi thực tế, ứng xử của kết cấu sau khi gia cường rất phức tạp và phụ thuộc vào nhiều yếu tố. Rất khó kiểm soát trạng thái phá hủy của kết cấu sau gia cường, đặc biệt là trạng thái phá hoại giòn do phá hoại lớp keo dính bám hoặc bóc tách lớp bê tông bảo vệ. Do đó, việc nghiên cứu ứng xử của kết cấu sàn BTCT sau khi được gia cường về cả phương diện lý thuyết lẫn thực nghiệm là rất cần thiết. Trong bài báo này, kết quả phân tích mô hình số làm rõ ứng xử của sàn BTCT được gia cường bằng vật liệu tổng hợp FRP thông qua phân tích chi tiết về ứng suất, biến dạng và chuyển vị trong sàn. Cụ thể, khi tăng bề dày tấm gia cường, ứng suất, biến dạng và chuyển vị của sàn BTCT giảm xuống, mức độ giảm lần lượt là ứng suất từ 46.70% đến 74.78%, biến dạng từ 45.59% đến 73.56% và chuyển vị từ 14.32% đến 27.1%. Khi tăng cấp tải trọng, ứng suất, biến dạng và chuyển vị của sàn BTCT tăng lên, mức độ tăng lần lượt là ứng suất từ 13.36% đến 58.27%
biến dạng từ 14.47% đến 57.89% và chuyển vị từ 11.93% đến 47.70%. Từ khóa: Gia cường
FRP
sàn bê tông cốt thép
ứng xử cơ học.The reinforced concrete (RC) slab strengthened with FRP sheets has been popular. The lack of design standards is a significant barrier for the extensive use of FRP for RC in Vietnam. The behavior of the structure depends on many factors. It is difficult to control the failure state of the structure after strengthening, especially brittle failure state due to destruction of the adhesive layer or removal of the protective concrete layer. It is necessary to study the behavior of reinforced concrete slab structure after being strengthened both theoretically and experimentally. In this paper, the results of numerical model analysis clarify the behavior of reinforced concrete slab with FRP slabs based on the analysis of stress, deformation and displacement of the slab. In detail, as increasing the thickness of the FRP sheets, the bending stress, deformation and displacement of the reinforced concrete floor decreased, the reduction of the bending stress from 46.70% to 74.78%, deformation from 45.59% to 73 ,56% and displacement from 14.32% to 27.1%, respectively. As increasing the load level of the slabs,the bending stress, deformation and displacement of the reinforced concrete floor increased, the the increase of the bending stress from13.36% to 58.27%
deformation from 14.47% to 57.89% and displacement from 11.93% to 47.70%, respectively. Key words: Strengthening, FRP
reinforced concrete slab
mechanical behavior.

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