本文選題：鋼結(jié)構(gòu) + 升溫��； 參考：《建筑結(jié)構(gòu)》2017年S2期

【摘要】：針對(duì)鋼結(jié)構(gòu)在受火過(guò)程以及高溫鋼結(jié)構(gòu)受到噴淋水急速冷卻作用產(chǎn)生的沖擊效應(yīng),通過(guò)建立H形鋼結(jié)構(gòu)計(jì)算模型,模擬分析了鋼結(jié)構(gòu)不同部位在升降溫過(guò)程中梁柱節(jié)點(diǎn)附近區(qū)域的應(yīng)力水平以及梁端軸力的變化特性。通過(guò)模擬結(jié)果可知:在受火的開(kāi)始階段緩慢增加,而當(dāng)結(jié)構(gòu)達(dá)到一定溫度后梁端軸力和節(jié)點(diǎn)附近區(qū)域的應(yīng)力都快速增加直到梁屈服。梁屈服后,其梁端軸力和節(jié)點(diǎn)區(qū)域附近的應(yīng)力都快速降低,但直至升溫到約800℃時(shí),梁端仍然保持較大的軸力和一定的應(yīng)力水平。而在噴水冷卻降溫過(guò)程中,梁端軸力快速降低直到零,隨后又快速增加,直到達(dá)到最大拉力狀態(tài)。而節(jié)點(diǎn)附近區(qū)域梁柱上的應(yīng)力水平也是先降低后增加,而且冷卻到環(huán)境溫度時(shí)節(jié)點(diǎn)附近區(qū)域的應(yīng)力要比升溫過(guò)程的最大應(yīng)力要高。同時(shí),在對(duì)不同部位受火及冷卻時(shí)對(duì)結(jié)構(gòu)的軸力和應(yīng)力水平也有影響,在梁腹板處受火并噴水冷卻時(shí)梁端軸力最大,在梁下翼緣處受火及冷卻時(shí)次之,在梁上翼緣受火及冷卻時(shí)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(hào)：1791067