MVME2431-1工控模塊卡件
在可持續(xù)性框架內(nèi)，對(duì)現(xiàn)有結(jié)構(gòu)進(jìn)行FRP改造可能會(huì)帶來(lái)好處，有助于提高改造結(jié)構(gòu)的壽命和安全性。因此，F(xiàn)RP加固可被視為加固和修復(fù)現(xiàn)有結(jié)構(gòu)的可持續(xù)設(shè)計(jì)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(guò)LCA調(diào)查評(píng)估的FRP的環(huán)境優(yōu)勢(shì)。1.2范圍本文件為外部加固混凝土結(jié)構(gòu)的FRP系統(tǒng)的選擇、設(shè)計(jì)和安裝提供了指導(dǎo)。介紹了用作外部加固的FRP系統(tǒng)的材料性能、設(shè)計(jì)、安裝、質(zhì)量控制和維護(hù)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(qiáng)度、剛度或兩者，或柱的延性和其他應(yīng)用。本指南的基礎(chǔ)是大量研究。這項(xiàng)研究始于20世紀(jì)80年代，包括FRP加固系統(tǒng)的分析研究、實(shí)驗(yàn)工作和現(xiàn)場(chǎng)監(jiān)測(cè)應(yīng)用。根據(jù)現(xiàn)有研究，本文概述的設(shè)計(jì)程序被認(rèn)為是保守的。FRP材料的耐久性和長(zhǎng)期性能一直是許多研究的主題；然而，這項(xiàng)研究仍在進(jìn)行中。
本指南中的設(shè)計(jì)指南通過(guò)提供各種環(huán)境的降低系數(shù)，說(shuō)明了環(huán)境退化和長(zhǎng)期耐久性。本文件中指出的應(yīng)力限制也解決了長(zhǎng)期疲勞和蠕變問(wèn)題。這些因素和限制被認(rèn)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(huì)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(fù)載條件的耦合效應(yīng)需要進(jìn)一步研究。在FRP系統(tǒng)同時(shí)受到極端環(huán)境和應(yīng)力條件影響的應(yīng)用中，應(yīng)小心謹(jǐn)慎。與FRP系統(tǒng)的長(zhǎng)期耐久性相關(guān)的因素也可能影響用于設(shè)計(jì)的材料的拉伸彈性模量。關(guān)于FRP系統(tǒng)與基材的結(jié)合的許多問(wèn)題仍然是大量研究的焦點(diǎn)。對(duì)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(gòu)件的強(qiáng)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(zhǔn)確的方法來(lái)預(yù)測(cè)脫粘。在整個(gè)設(shè)計(jì)過(guò)程中，對(duì)FRP材料中獲得的應(yīng)變（以及由此獲得的應(yīng)力）施加了重大限制，以保守地解釋脫粘失效模式。這些設(shè)計(jì)程序的未來(lái)發(fā)展應(yīng)包括更全面的脫粘預(yù)測(cè)方法。本文件為FRP系統(tǒng)的正確詳細(xì)設(shè)計(jì)和安裝提供了指導(dǎo)，以防止多種類(lèi)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.
