本文選題：鋼結構 + 升溫　； 參考：《建筑結構》2017年S2期

【摘要】：針對鋼結構在受火過程以及高溫鋼結構受到噴淋水急速冷卻作用產生的沖擊效應,通過建立H形鋼結構計算模型,模擬分析了鋼結構不同部位在升降溫過程中梁柱節(jié)點附近區(qū)域的應力水平以及梁端軸力的變化特性。通過模擬結果可知:在受火的開始階段緩慢增加,而當結構達到一定溫度后梁端軸力和節(jié)點附近區(qū)域的應力都快速增加直到梁屈服。梁屈服后,其梁端軸力和節(jié)點區(qū)域附近的應力都快速降低,但直至升溫到約800℃時,梁端仍然保持較大的軸力和一定的應力水平。而在噴水冷卻降溫過程中,梁端軸力快速降低直到零,隨后又快速增加,直到達到最大拉力狀態(tài)。而節(jié)點附近區(qū)域梁柱上的應力水平也是先降低后增加,而且冷卻到環(huán)境溫度時節(jié)點附近區(qū)域的應力要比升溫過程的最大應力要高。同時,在對不同部位受火及冷卻時對結構的軸力和應力水平也有影響,在梁腹板處受火并噴水冷卻時梁端軸力最大,在梁下翼緣處受火及冷卻時次之,在梁上翼緣受火及冷卻時軸力最小。
[Abstract]:In view of the impact effect of steel structure in the course of fire and the rapid cooling of high temperature steel structure by spraying water, the calculation model of H-shaped steel structure is established. The stress level near the joint of Liang Zhu and the variation characteristics of axial force at the end of the beam are simulated and analyzed in the process of rising and cooling of different parts of steel structure. The simulation results show that the initial stage of the fire increases slowly, but when the structure reaches a certain temperature, the axial force at the end of the beam and the stress near the joint increase rapidly until the beam yield. After the beam yield, the axial force at the end of the beam and the stress near the joint region decrease rapidly, but the axial force and the stress level at the end of the beam are still large until the temperature rises to about 800 鈩，

本文編號：1791067