KHUYẾN NGHỊ KHI TÍNH TOÁN ĐỘ VÕNG NGẮN HẠN CỦA CẤU KIỆN BÊ TÔNG CỐT THÉP THEO TIÊU CHUẨN TCVN 5574:2018 QUA VIỆC SO SÁNH VỚI MÔ PHỎNG PHẦN TỬ HỮU HẠN

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Tác giả: Quang Tùng Nguyễn, Thanh Bình Trần, Quang Thịnh Trịnh, Hoài Chính Trương, Lê Thắng Vương

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2024

Mô tả vật lý: tr.178 - 186

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ID: 462533

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Sự hấp phụ arsenate trong nước bằng vật liệu tổ hợp nano từ tính ZnFe2O4/α-Fe2O3/than sinh học (MBC) đã được nghiên cứu trong bài báo này. Các nghiên cứu thực nghiệm hấp phụ được thực hiện bằng cách thay đổi độ pH, nhiệt độ rung lắc và nồng độ As5+ ban đầu. Khả năng hấp phụ As5+ phụ thuộc vào pH và cho thấy hiệu quả loại bỏ As5+ tối đa ở pH 8.0. Nghiên cứu sự hấp phụ asen ở nồng độ ban đầu là 5–35 mg/L được thực hiện ở pH 8.0 và nhiệt độ 303 K, 313 K và 323 K. Mô hình hấp phụ đẳng nhiệt Langmuir, Freundlich và Temkin được sử dụng để phân tích số liệu thực nghiệm. Động học hấp phụ được nghiên cứu bằng mô hình giả bậc nhất, giả bậc hai và mô hình Elovich. Các mô hình giả bậc hai và mô hình Langmuir được làm khớp phù hợp với sự hấp phụ As5+ trên MBC. Sự hấp phụ arsenate bằng vật liệu MBC chủ yếu được kiểm soát bởi cơ chế hấp phụ hóa học và vật lý. MBC có thể dễ dàng được thu hồi và tái sử dụng bằng cách sử dụng từ trường bên ngoài. MBC có tiềm năng đạt được hiệu suất hấp phụ cao.This study focuses on evaluating short-term deflections of reinforced concrete beams according to the Vietnamese Standard on the Design of Concrete and Reinforced Concrete Structures (TCVN 5574:2018) by comparing them with simulated results obtained from Abaqus software. The aim is to propose recommendations to enhance safety in calculating deflections according to TCVN 5574:2018. The Concrete Damaged Plasticity model is defined in the Abaqus software to account for complex behaviors of concrete, while in the TCVN 5574:2018, bilinear or trilinear stress-strain curves are used to facilitate practical calculations. It is found that values of deflections calculated according to TCVN 5574:2018 could be underestimated during the non-cracking stage of concrete and overestimated at higher levels of loads before reaching the yielding point of steel with differences varied between 15% and 20%. By comparing results from practical standards and complex simulations, this research contributes to the enhancement of design methodologies and structural safety.

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