本文選題：索張拉　切入點(diǎn)：預(yù)應(yīng)力鋼結(jié)構(gòu)　出處：《寧波大學(xué)》2013年碩士論文

【摘要】：火災(zāi)是對(duì)人類生命財(cái)產(chǎn)安全威脅最大的災(zāi)害之一，如何減小建筑物火災(zāi)的危害性一直是人們關(guān)注的課題。預(yù)應(yīng)力鋼結(jié)構(gòu)的優(yōu)點(diǎn)是可以節(jié)省材料、提高承載能力、充分發(fā)揮材料的強(qiáng)度潛力、能獲得較大的經(jīng)濟(jì)效益，因而其應(yīng)用也越來(lái)越廣泛。但預(yù)應(yīng)力鋼結(jié)構(gòu)也有顯著的缺點(diǎn)，就是不耐火。通過(guò)對(duì)高強(qiáng)度索的張拉實(shí)現(xiàn)對(duì)鋼結(jié)構(gòu)施加預(yù)應(yīng)力就形成了索張拉預(yù)應(yīng)力鋼結(jié)構(gòu)。這種結(jié)構(gòu)具有巨大的內(nèi)部能量，高強(qiáng)度索在火災(zāi)條件下受到高溫的作用會(huì)發(fā)生松弛而導(dǎo)致預(yù)應(yīng)力的損失，可能引起結(jié)構(gòu)的突然破壞，從而對(duì)人類生命財(cái)產(chǎn)造成嚴(yán)重威脅。因此，對(duì)索張拉預(yù)應(yīng)力鋼結(jié)構(gòu)火災(zāi)下的力學(xué)性能研究具有重要的理論意義和工程應(yīng)用價(jià)值。 不銹鋼材料具有良好的力學(xué)性能及優(yōu)越的抗腐蝕性能，特別是具有較高的高溫下強(qiáng)度。本文首先對(duì)一組共12個(gè)由SUS304不銹鋼薄壁圓管制成的索張拉預(yù)應(yīng)力鋼桁架進(jìn)行了火災(zāi)下及火災(zāi)后的試驗(yàn)研究，考察了不同的受火溫度、不同的結(jié)構(gòu)剛度、不同的張拉方式、不同的荷載大小對(duì)結(jié)構(gòu)力學(xué)性能的影響。然后利用有限元軟件Marc對(duì)該組鋼桁架在實(shí)測(cè)火災(zāi)溫度條件下的力學(xué)性能進(jìn)行了模擬計(jì)算，并與試驗(yàn)實(shí)測(cè)結(jié)果進(jìn)行了比較。 研究結(jié)果表明，，由304不銹鋼管制成的預(yù)應(yīng)力空間桁架具有較高的承載力和較強(qiáng)的變形能力，結(jié)構(gòu)破壞的主要形式是整體失穩(wěn)，結(jié)構(gòu)破壞的原因主要在于火災(zāi)高溫條件下高強(qiáng)度索發(fā)生了松弛，預(yù)應(yīng)力受到了較大的損失。在其他條件相同時(shí)單因素對(duì)結(jié)構(gòu)性能的影響表現(xiàn)為：火災(zāi)下的受火溫度對(duì)結(jié)構(gòu)撓度有非常重要的影響，一般是溫度越高則結(jié)構(gòu)發(fā)生的撓度就越大;結(jié)構(gòu)剛度越大，則在火災(zāi)下發(fā)生的撓度會(huì)越小;荷載量越大，則結(jié)構(gòu)在火災(zāi)下發(fā)生的撓度會(huì)越大;在減小火災(zāi)下結(jié)構(gòu)的撓度方面，二次張拉要比一次張拉的效果更好;所施加的預(yù)應(yīng)力值越大，則結(jié)構(gòu)在火災(zāi)下發(fā)生的撓度會(huì)越小。Marc軟件的模擬結(jié)果與火災(zāi)下試驗(yàn)結(jié)果基本吻合，具有較高的參考價(jià)值。
[Abstract]:Fire is one of the most dangerous disasters to the safety of human life and property.The advantage of prestressed steel structure is that it can save the material, improve the bearing capacity, give full play to the strength potential of the material, and obtain greater economic benefits, so its application is becoming more and more extensive.But the prestressed steel structure also has the obvious drawback, namely does not have the fire resistance.This kind of structure has huge internal energy, and the high strength cable under the action of high temperature will relax and lead to the loss of prestressing force, which may cause the sudden destruction of the structure, thus causing a serious threat to human life and property.Therefore, it has important theoretical significance and engineering application value to study the mechanical properties of cable-tensioned prestressed steel structures under fire.Stainless steel has good mechanical properties and excellent corrosion resistance, especially high strength at high temperature.In this paper, a group of 12 cable-tensioned prestressed steel trusses made of SUS304 stainless steel thin-walled circular pipes are studied under fire and after fire. Different fire temperatures, different structural stiffness and different tension modes are investigated.The influence of different loads on the mechanical properties of the structure.Then the finite element software Marc is used to simulate the mechanical properties of the steel truss under the condition of the measured fire temperature, and the results are compared with the experimental results.The results show that the prestressed space truss made of 304 stainless steel pipe has higher bearing capacity and stronger deformation capacity, and the main form of structural failure is overall instability.The main reason of structural failure is that the high strength cable is loosened and the prestress is lost greatly under the condition of fire and high temperature.When other conditions are the same, the effect of single factor on the structure performance is as follows: the temperature of fire has a very important effect on the deflection of the structure, generally, the higher the temperature, the bigger the deflection of the structure and the greater the stiffness of the structure.The smaller the deflection under fire; the greater the load, the greater the deflection of the structure under fire; in reducing the deflection of the structure under fire, the effect of secondary tension is better than that of primary tension; and the greater the value of prestress applied,Then the deflection of the structure under fire will be smaller. Marc software simulation results are in good agreement with the experimental results under fire, which has a higher reference value.
【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU394

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