MVME2431-1工控模塊卡件
在可持續(xù)性框架內，對現(xiàn)有結構進行FRP改造可能會帶來好處，有助于提高改造結構的壽命和安全性。因此，F(xiàn)RP加固可被視為加固和修復現(xiàn)有結構的可持續(xù)設計的可行方法。Napolano等人（2015）、Moliner Santisteve等人（2013）、Zhang等人（2012）和Das（2011）列舉了通過LCA調查評估的FRP的環(huán)境優(yōu)勢。1.2范圍本文件為外部加固混凝土結構的FRP系統(tǒng)的選擇、設計和安裝提供了指導。介紹了用作外部加固的FRP系統(tǒng)的材料性能、設計、安裝、質量控制和維護信息。該信息可用于選擇FRP系統(tǒng)，以增加鋼筋混凝土梁的強度、剛度或兩者，或柱的延性和其他應用。本指南的基礎是大量研究。這項研究始于20世紀80年代，包括FRP加固系統(tǒng)的分析研究、實驗工作和現(xiàn)場監(jiān)測應用。根據(jù)現(xiàn)有研究，本文概述的設計程序被認為是保守的。FRP材料的耐久性和長期性能一直是許多研究的主題；然而，這項研究仍在進行中。
本指南中的設計指南通過提供各種環(huán)境的降低系數(shù)，說明了環(huán)境退化和長期耐久性。本文件中指出的應力限制也解決了長期疲勞和蠕變問題。這些因素和限制被認為是保守的。然而，隨著更多的研究變得可用，這些因素可能會被修改，具體的環(huán)境條件和荷載條件將得到更好的定義。此外，環(huán)境條件和負載條件的耦合效應需要進一步研究。在FRP系統(tǒng)同時受到極端環(huán)境和應力條件影響的應用中，應小心謹慎。與FRP系統(tǒng)的長期耐久性相關的因素也可能影響用于設計的材料的拉伸彈性模量。關于FRP系統(tǒng)與基材的結合的許多問題仍然是大量研究的焦點。對于彎曲和剪切加固，有許多不同的脫粘破壞模式可以控制FRP加固構件的強度。雖然研究人員已經(jīng)確定了大多數(shù)脫粘模式，但仍需要更準確的方法來預測脫粘。在整個設計過程中，對FRP材料中獲得的應變（以及由此獲得的應力）施加了重大限制，以保守地解釋脫粘失效模式。這些設計程序的未來發(fā)展應包括更全面的脫粘預測方法。本文件為FRP系統(tǒng)的正確詳細設計和安裝提供了指導，以防止多種類型的脫粘失效模式。
Within the framework of sustainability, FRP retrofitting of existing structures may bring benefits and help improve the life and safety of retrofitted structures. Therefore, FRP strengthening can be considered as a feasible method for sustainable design of strengthening and repairing existing structures. Napolano et al. (2015), Moliner Santisteve et al. (2013), Zhang et al. (2012) and Das (2011) listed the environmental advantages of FRP assessed through LCA survey. 1.2 Scope This document provides guidance for the selection, design and installation of FRP systems for externally reinforced concrete structures. The material properties, design, installation, quality control and maintenance information of FRP system used for external reinforcement are introduced. This information can be used to select FRP systems to increase the strength, stiffness, or both of reinforced concrete beams, or the ductility of columns and other applications. This guide is based on extensive research. This research started in the 1980s, including the analysis and research, experimental work and field monitoring application of FRP strengthening system. Based on existing research, the design procedures outlined in this paper are considered conservative. The durability and long-term performance of FRP materials have been the subject of many studies; However, the study is still in progress.
The design guidelines in this guide describe environmental degradation and long-term durability by providing reduction factors for various environments. The stress limits indicated in this document also address long-term fatigue and creep problems. These factors and limitations are considered conservative. However, as more research becomes available, these factors may be modified and specific environmental and loading conditions will be better defined. In addition, the coupling effect of environmental conditions and load conditions needs further study. Care should be taken in applications where FRP systems are subject to both extreme environmental and stress conditions. Factors related to the long-term durability of the FRP system may also affect the tensile modulus of elasticity of the materials used for design. Many problems about the combination of FRP system and substrate are still the focus of a lot of research. For flexural and shear strengthening, there are many different debonding failure modes that can control the strength of FRP strengthened members. Although researchers have identified most debonding modes, more accurate methods are needed to predict debonding. Throughout the design process, significant limitations were placed on the strain (and hence the stress) obtained in the FRP material to conservatively explain the debonding failure mode. The future development of these design programs should include more comprehensive debonding prediction methods. This document provides guidance for the proper detailed design and installation of FRP systems to prevent multiple types of debonding failure modes.
