人民长江
人民長江
인민장강
YANGTZE RIVER
2014年
14期
97-101,111
,共6页
倒虹吸地涵%温度场%温度作用%数值模拟
倒虹吸地涵%溫度場%溫度作用%數值模擬
도홍흡지함%온도장%온도작용%수치모의
siphon culvert%temperature field%temperature effect%numerical simulation
以南水北调中线工程某倒虹吸结构为研究对象，利用ADINA有限元软件稳态、瞬态温度模块，计算分析了水温变化形式和加载速率对倒虹吸结构温度场的影响规律，同时借助温度-结构模块，对倒虹吸结构应力、变形与温度变化之间的关系进行了研究。结果表明，对于倒虹吸这类管壁较薄结构，环境温度可近似简化为线性变化；在考虑初始温度场以及水温变化速率的条件后，结构内外表面实际最大温差与设计中采用的水温与地温最大温差之间存在一定差异；当水温高于地温时，倒虹吸结构会随着水温的升高出现向外膨胀趋势，这将对结构整体受力产生不利影响；当水温低于地温时，倒虹吸结构会随着水温的降低出现向内收缩趋势，左右侧墙向内的收缩阻止了顶板向内的收缩，这在一定程度上对结构产生有利影响。
以南水北調中線工程某倒虹吸結構為研究對象，利用ADINA有限元軟件穩態、瞬態溫度模塊，計算分析瞭水溫變化形式和加載速率對倒虹吸結構溫度場的影響規律，同時藉助溫度-結構模塊，對倒虹吸結構應力、變形與溫度變化之間的關繫進行瞭研究。結果錶明，對于倒虹吸這類管壁較薄結構，環境溫度可近似簡化為線性變化；在攷慮初始溫度場以及水溫變化速率的條件後，結構內外錶麵實際最大溫差與設計中採用的水溫與地溫最大溫差之間存在一定差異；噹水溫高于地溫時，倒虹吸結構會隨著水溫的升高齣現嚮外膨脹趨勢，這將對結構整體受力產生不利影響；噹水溫低于地溫時，倒虹吸結構會隨著水溫的降低齣現嚮內收縮趨勢，左右側牆嚮內的收縮阻止瞭頂闆嚮內的收縮，這在一定程度上對結構產生有利影響。
이남수북조중선공정모도홍흡결구위연구대상，이용ADINA유한원연건은태、순태온도모괴，계산분석료수온변화형식화가재속솔대도홍흡결구온도장적영향규률，동시차조온도-결구모괴，대도홍흡결구응력、변형여온도변화지간적관계진행료연구。결과표명，대우도홍흡저류관벽교박결구，배경온도가근사간화위선성변화；재고필초시온도장이급수온변화속솔적조건후，결구내외표면실제최대온차여설계중채용적수온여지온최대온차지간존재일정차이；당수온고우지온시，도홍흡결구회수착수온적승고출현향외팽창추세，저장대결구정체수력산생불리영향；당수온저우지온시，도홍흡결구회수착수온적강저출현향내수축추세，좌우측장향내적수축조지료정판향내적수축，저재일정정도상대결구산생유리영향。
Taking a siphon structure in South-to-North Water Diversion Project as a research object and with the use of steady state and transient temperature modules in ADINA, we simulate and analyze the temperature field of inverted siphon struc-ture that is influenced by variation forms and loading rate of water temperature, at the same time, the relationship between struc-ture stress, deformation of the inverted siphon and the temperature changes is studied with the aid of temperature-structure mod-ule. The results show that the environment temperature can be simplified as linear for the inverted siphon of thinner structure;If considering the initial temperature field and the changing rate of water temperature, the maximum temperature difference of water temperature and ground temperature does not equal to the real maximum temperature difference of inside and outside surface;When the water temperature is higher than the ground temperature, there is a tendency of outward expansion for the inverted si-phon structure with the rise of water temperature, thus exerting an adverse effect on stress state of the overall inverted siphon;Conversely, when the water temperature is below the ground temperature, there is a tendency of inward contraction for the invert-ed siphon structure with the dropping of water temperature, and the inward contraction of left and right side walls prevent roof from inward contraction, thus gaining beneficial effect on the overall inverted siphon.
