广西大学学报(自然科学版)
廣西大學學報(自然科學版)
엄서대학학보(자연과학판)
JOURNAL OF GUANGXI UNIVERSITY (NATURAL SCIENCE EDITION)
2014年
4期
886-893
,共8页
桥梁工程%悬索桥%吊索%主缆%公路火灾%安全距离
橋樑工程%懸索橋%弔索%主纜%公路火災%安全距離
교량공정%현색교%조색%주람%공로화재%안전거리
bridge engineering%suspension bridge%suspender cable%main cable%highway fire%safety distance
为研究公路火灾对大跨径悬索桥带来的影响,弥补悬索桥火灾研究的空白,结合结构火灾分析的特点,确定选择间接耦合法进行热-结构耦合分析。以300 MW 车辆火灾为例,运用 ANSYS 有限元程序,建立了悬索桥不同断面的火灾坐标模型,在总结国内外火灾研究工作的基础上,基于 Ingason H.平方增长模型,以典型的大跨径悬索桥缆索承重构件的公路火灾安全距离为研究对象,以降低工程风险、保证大跨径悬索桥结构的安全性和稳定性为研究目标,对大跨径悬索桥吊索和主缆安全距离进行数值模拟,提出了适用于公路火灾研究的热释放率数学模型;建立了公路火灾的物理模型并确定了公路火灾燃烧热源的尺寸和单位面积释热率;并通过热-结构耦合分析,确定了公路火灾下悬索桥吊索和0.4~1.0 m 范围内不同直径主缆的安全距离。研究成果可为今后大跨径悬索桥的抗火设计提供科学依据。
為研究公路火災對大跨徑懸索橋帶來的影響,瀰補懸索橋火災研究的空白,結閤結構火災分析的特點,確定選擇間接耦閤法進行熱-結構耦閤分析。以300 MW 車輛火災為例,運用 ANSYS 有限元程序,建立瞭懸索橋不同斷麵的火災坐標模型,在總結國內外火災研究工作的基礎上,基于 Ingason H.平方增長模型,以典型的大跨徑懸索橋纜索承重構件的公路火災安全距離為研究對象,以降低工程風險、保證大跨徑懸索橋結構的安全性和穩定性為研究目標,對大跨徑懸索橋弔索和主纜安全距離進行數值模擬,提齣瞭適用于公路火災研究的熱釋放率數學模型;建立瞭公路火災的物理模型併確定瞭公路火災燃燒熱源的呎吋和單位麵積釋熱率;併通過熱-結構耦閤分析,確定瞭公路火災下懸索橋弔索和0.4~1.0 m 範圍內不同直徑主纜的安全距離。研究成果可為今後大跨徑懸索橋的抗火設計提供科學依據。
위연구공로화재대대과경현색교대래적영향,미보현색교화재연구적공백,결합결구화재분석적특점,학정선택간접우합법진행열-결구우합분석。이300 MW 차량화재위례,운용 ANSYS 유한원정서,건립료현색교불동단면적화재좌표모형,재총결국내외화재연구공작적기출상,기우 Ingason H.평방증장모형,이전형적대과경현색교람색승중구건적공로화재안전거리위연구대상,이강저공정풍험、보증대과경현색교결구적안전성화은정성위연구목표,대대과경현색교조색화주람안전거리진행수치모의,제출료괄용우공로화재연구적열석방솔수학모형;건립료공로화재적물리모형병학정료공로화재연소열원적척촌화단위면적석열솔;병통과열-결구우합분석,학정료공로화재하현색교조색화0.4~1.0 m 범위내불동직경주람적안전거리。연구성과가위금후대과경현색교적항화설계제공과학의거。
In order to study the influence of highway fire on long-span suspension bridges and fill in the blank of suspension bridge fire research, combining structure fire analysis, an indirect coupling method was chosen to carry out the thermal-structure coupling analysis. Taking a 300 MW vehicle fire as an example, ANSYS was used to build the fire coordinate model of different section of a typi-cal suspension bridge. On the basis of fire research domestic and abroad, basing on the Ingason H. square growth model and taking the safety distance for cable bearing component of the long-span sus-pension bridge in highway fire as a research object, a numerical simulation for the safety distance of suspender cable and main cable was performed to reduce project risk and ensure the safety and sta-bility of the bridge. A thermal release rate mathematical model which suits highway fire study was put forward; The safety distance model in highway fire was established, and the size of combustion heat source and heat release rate of unit area were determined; With the thermal-structure coupling analysis, the fire safety distance for suspender cable and main cable of different diameters (0. 4 ~1. 0 m) were determined. The research results can provide some scientific basis for the fire resist-ance design of long-span suspension bridges.