本文選題：溫度場 + 溫度應(yīng)力�。� 參考：《人民黃河》2017年04期

【摘要】：采用ANSYS有限元軟件建立了山西中部引黃工程橋頭渡槽混凝土T構(gòu)3號塊的有限元模型。在考慮晝夜氣溫變化的條件下,模擬了寒潮期間該渡槽早期的瞬態(tài)溫度場和應(yīng)力場。結(jié)果表明:該槽段截面?zhèn)葔Φ耐獗砻婧晚敯迮c側(cè)墻重疊處內(nèi)外溫差大,分別出現(xiàn)3.4 MPa和3.9 MPa的拉應(yīng)力,需采取適當(dāng)溫控措施;計算節(jié)點(diǎn)的溫度和溫度應(yīng)力都隨晝夜氣溫變化而波動,且波動幅度和氣溫變化幅度成正比;在遭遇寒潮襲擊、平均氣溫下降6℃的情況下,內(nèi)外溫差變大,該渡槽表面的應(yīng)力提高0.5 MPa,這對于早齡期混凝土防裂是不利的。
[Abstract]:ANSYS finite element software is used to establish the finite element model of concrete T-3 block of bridgehead aqueduct of the Yellow River diversion Project in central Shanxi Province. The transient temperature field and stress field of the aqueduct in the early stage of the cold wave were simulated under the condition of the temperature variation of day and night. The results show that the temperature difference between the outer surface and the roof and the side wall of the slot section is large, and the tensile stress of 3.4 MPa and 3.9 MPa appears, respectively, and the appropriate temperature control measures should be taken. The temperature and stress of the node fluctuate with the change of temperature day and night, and the amplitude of fluctuation is proportional to the amplitude of temperature change. When the average temperature decreases by 6 鈩，

本文編號：1964758