本文選題：鋼-木螺栓連接　切入點：木結(jié)構(gòu)框架　出處：《東南大學(xué)》2016年碩士論文

【摘要】：木結(jié)構(gòu)建筑在我國的發(fā)展擁有悠久的歷史,近年來,隨著我國經(jīng)濟(jì)的迅猛增長,建筑結(jié)構(gòu)形式的發(fā)展日趨多元化,綠色環(huán)保、舒適健康的建筑需求使得木結(jié)構(gòu)建筑再次成為建筑領(lǐng)域的熱點。在我國的既有建筑中,存在大量具有歷史價值和文化價值的古木建筑,與此同時,木結(jié)構(gòu)也因紋理美觀、材料環(huán)�？稍偕粡V泛運(yùn)用于新建建筑中。據(jù)統(tǒng)計資料顯示,近年來我國建筑火災(zāi)的發(fā)生呈增多的態(tài)勢,火災(zāi)具有極大的危害性,造成大量的財產(chǎn)損失和人員傷亡。我國現(xiàn)存的諸多木結(jié)構(gòu)建筑都不可避免地面臨著火災(zāi)的威脅,然而,木結(jié)構(gòu)抗火在我國的研究尚處于初級階段,雖然已有部分學(xué)者開展了相關(guān)的試驗與理論研究,但遠(yuǎn)不能滿足木結(jié)構(gòu)發(fā)展和應(yīng)用的需求。在防火設(shè)計方面,我國現(xiàn)行規(guī)范中有關(guān)木結(jié)構(gòu)防火的相關(guān)規(guī)定主要參考?xì)W美發(fā)達(dá)國家規(guī)范制定,缺乏基于我國研究人員科研成果的運(yùn)用。鑒于上述情況,加強(qiáng)木結(jié)構(gòu)建筑抗火性能的研究具有重大的意義。本文以鋼-木螺栓連接木結(jié)構(gòu)框架為研究對象,開展了火災(zāi)試驗研究和有限元軟件ABAQUS平臺上的火災(zāi)環(huán)境下模型熱-力耦合分析,主要內(nèi)容可分為以下幾個部分：(1)從木材的炭化機(jī)理、炭化速度和木結(jié)構(gòu)火災(zāi)下的力學(xué)性能等角度,總結(jié)和回顧國內(nèi)外學(xué)者在木結(jié)構(gòu)抗火性能研究領(lǐng)域的主要工作與成果。(2)以有限元軟件ABAQUS為平臺,采用溫度場-結(jié)構(gòu)場順序耦合分析方法對既有試驗進(jìn)行模擬,通過試驗結(jié)果與計算結(jié)果的對比驗證了該分析方法的有效性。(3)以現(xiàn)代木結(jié)構(gòu)常用的鋼填板螺栓連接T型節(jié)點為考察對象進(jìn)行參數(shù)分析,通過有限元軟件ABAQUS計算分析了火災(zāi)條件下,持荷水平、螺栓直徑和螺栓邊距對節(jié)點的破壞模式與耐火極限的影響。結(jié)果表明,持荷水平的增大、螺栓直徑的增大以及螺栓邊距的減小均會導(dǎo)致耐火極限的降低。(4)以鋼-木螺栓連接木結(jié)構(gòu)框架為試驗對象,進(jìn)行了1榀常溫下靜載試驗和3榀高溫下耐火極限試驗,考察了持荷水平、隅撐設(shè)置對木結(jié)構(gòu)框架破壞模式與耐火極限的影響。結(jié)果表明,降低試件持荷水平和增加隅撐均為提高試件耐火極限的有效途徑；增設(shè)隅撐改變了原木框架的內(nèi)力分布,減小了跨中彎矩和梁端剪力,從而延緩了梁端剪切破壞的發(fā)生。(5)以鋼-木螺栓連接木結(jié)構(gòu)框架為考察對象進(jìn)行有限元模擬,分析了整體框架在火災(zāi)條件下的結(jié)構(gòu)響應(yīng)和內(nèi)力變化情況。(6)結(jié)合國內(nèi)外木結(jié)構(gòu)設(shè)計規(guī)范,針對木結(jié)構(gòu)的抗火設(shè)計提出建議,采用“折減截面法”對《木結(jié)構(gòu)設(shè)計手冊》中常溫下的承載力計算公式進(jìn)行適當(dāng)轉(zhuǎn)化,獲得了火災(zāi)條件下梁、柱構(gòu)件與螺栓連接的承載力計算公式。
[Abstract]:Wood structure architecture has a long history in our country. In recent years, with the rapid growth of our economy, the development of building structure forms is becoming more and more diversified, green environmental protection.The comfortable and healthy building demand makes the wooden structure architecture become the hot spot in the field of architecture again.Among the existing buildings in China, there are a large number of ancient wooden buildings with historical and cultural values. At the same time, wood structures are widely used in newly built buildings because of their beautiful texture and environmentally renewable materials.According to statistical data, the occurrence of building fires in our country is increasing in recent years, fire has great harm, resulting in a large number of property losses and casualties.Many existing wood structure buildings in China are inevitably facing the threat of fire. However, the study of wood structure fire resistance in China is still in the primary stage, although some scholars have carried out relevant experiments and theoretical studies.But far from meeting the demand of wood structure development and application.In the aspect of fire prevention design, the relevant regulations on fire prevention of wood structure in the current code of our country mainly refer to the norms of developed countries in Europe and the United States, and lack the application based on the scientific research results of Chinese researchers.In view of the above situation, it is of great significance to study the fire resistance of wood structure buildings.In this paper, the steel-wood bolted timber structure frame is taken as the research object, the fire test research and the thermal-mechanical coupling analysis of the model under the fire environment on the finite element software ABAQUS platform are carried out.The main contents can be divided into the following parts: 1) from the perspective of the carbonization mechanism of wood, the carbonization speed and the mechanical properties of wood structures under fire,This paper summarizes and reviews the main works and achievements of domestic and foreign scholars in the field of wood structure fire resistance. Based on the finite element software ABAQUS, the existing tests are simulated by the sequential coupling analysis method of temperature field and structure field.The validity of the analysis method is verified by comparing the test results with the calculated results. The parameter analysis is carried out with the steel stud bolted T-joints commonly used in modern wooden structures as the object of investigation.The effects of load holding level, bolt diameter and bolt edge distance on the failure mode and fire resistance of joints under fire conditions were analyzed by finite element software ABAQUS.The results show that the increase of load holding level, the increase of bolt diameter and the decrease of bolt edge distance will lead to the decrease of fire resistance limit.A static load test at room temperature and three fire limit tests at high temperature were carried out. The effects of load holding level and corner bracing on the failure mode and fire resistance limit of wood frame were investigated.The results show that reducing the load holding level and increasing the corner brace are the effective ways to increase the fire resistance limit of the specimen, and the addition of corner brace changes the internal force distribution of the log frame and reduces the bending moment in the span and the shear force at the end of the beam.Thus delaying the occurrence of shear failure at the end of the beam. (5) taking the steel-wood bolted timber structure frame as the object of investigation, the finite element simulation is carried out.The structural response and internal force variation of the whole frame under fire condition are analyzed. (6) combined with the design code of wood structure at home and abroad, some suggestions for the fire resistant design of wood structure are put forward.The formula for calculating the bearing capacity of beams, columns and bolts under fire condition is obtained by properly transforming the formula of bearing capacity under normal temperature in the Design Manual of Wood structures by using the method of "reduced Section method", and the formula for calculating the bearing capacity of beams, columns and bolts under fire conditions is obtained.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU398.6;TU352.5

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