本文選題：火災(zāi)后 + 鋼材強(qiáng)度�。� 參考：《吉林建筑大學(xué)》2016年碩士論文

【摘要】：鋼材自問世以來在建筑領(lǐng)域得到了廣泛的應(yīng)用,尤其是鋼結(jié)構(gòu)建筑如雨后春筍般在各大城市矗立起來。近年來鋼結(jié)構(gòu)建筑火災(zāi)事故頻發(fā),檢測與修復(fù)工作尤為重要,火災(zāi)后的鋼材強(qiáng)度是必須檢測的性能指標(biāo)。傳統(tǒng)的截取試樣的方法屬于破損方法的一種,不利于后續(xù)的修復(fù)工作的開展。本文提出用非破損檢測方法—里氏硬度法,來測定火災(zāi)后鋼材的強(qiáng)度,建立了火災(zāi)后鋼材強(qiáng)度與里氏硬度的關(guān)系曲線及計(jì)算公式。首先,本課題選取了鋼結(jié)構(gòu)中常用的型材H型鋼作為試驗(yàn)對(duì)象,在承擔(dān)70%設(shè)計(jì)壓力下經(jīng)歷火災(zāi)高溫過程�；馂�(zāi)試驗(yàn)設(shè)置了6種不同的溫度,分別是100℃~600℃,并對(duì)恒定溫度下的加熱時(shí)間做出了限制,用了兩種冷卻方式模擬消防滅火,分別是澆水冷卻方式和自然冷卻方式。高溫冷卻后的試件,按承擔(dān)70%的火災(zāi)后剩余承載力的受力狀態(tài)和用機(jī)械式千斤頂固定的非受力狀態(tài)兩種情況,測試試件的里氏硬度值。在同一試件上,按翼緣位置的上中下檢測部位和腹板位置的上中下檢測部位分別測試?yán)锸嫌捕戎怠Ｔ诿總�(gè)試件的翼緣和腹板分別截取標(biāo)準(zhǔn)試樣,用拉力試驗(yàn)機(jī)測試其力學(xué)性能,并記錄數(shù)據(jù)。最后,對(duì)于冷卻方式、溫度、受力狀態(tài)、檢測部位等因素對(duì)里氏硬度測試值的影響進(jìn)行了分析,并采用線性和非線性兩種方法對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行了回歸分析,綜合考慮所有影響因素?cái)M合出了試件翼緣位置和腹板位置的里氏硬度與抗拉強(qiáng)度的曲線,確定了兩個(gè)位置的回歸方程,為火災(zāi)后鋼材強(qiáng)度的檢測提供了依據(jù)。
[Abstract]:Steel has been widely used in the field of architecture since it came out, especially the steel structure building sprang up in every big city.In recent years, steel structure fire accidents occur frequently, detection and repair work is particularly important, the strength of steel after the fire is the performance index that must be tested.The traditional method of sample interception belongs to the method of breakage, which is not conducive to the development of subsequent restoration work.In this paper, a non-breakage testing method, the Richter hardness method, is proposed to measure the strength of steel after fire. The relationship curve and calculation formula between the strength of steel after fire and Riemann hardness are established.Firstly, H-section, which is commonly used in steel structure, is selected as the test object, and it experiences fire high temperature process under 70% design pressure.Six different temperatures were set up in the fire test, which were 100 鈩，

本文編號(hào)：1743114