發(fā)布時(shí)間：2019-04-16 19:49

【摘要】：本文以門克慶礦井主立井井塔工程為依托,將該井塔底部抽柱方案中的轉(zhuǎn)換大梁設(shè)計(jì)為型鋼混凝土轉(zhuǎn)換梁,并利用有限元軟件SAP2000對(duì)型鋼混凝土轉(zhuǎn)換梁與轉(zhuǎn)換梁所支撐的上部框架構(gòu)件在水平和豎向荷載下的內(nèi)力分布變化情況進(jìn)行靜力彈性分析,并與落地框架下相應(yīng)部位的構(gòu)件內(nèi)力相比較,分析并總結(jié)轉(zhuǎn)換梁內(nèi)力及上部框架內(nèi)力的變化規(guī)律,從而探索減小轉(zhuǎn)換梁內(nèi)力的上部框架構(gòu)件的剛度調(diào)整方案;并利用有限元軟件ABAQUS對(duì)大跨度型鋼混凝土轉(zhuǎn)換梁受力性能進(jìn)行了豎向和水平荷載下擬靜力彈塑性分析研究,研究了型鋼腹板厚度、配筋率、型鋼保護(hù)層厚度等因素對(duì)轉(zhuǎn)換梁受力性能的影響,得到以下結(jié)論,可供井塔結(jié)構(gòu)設(shè)計(jì)時(shí)參考。⑴與落地框架相比,轉(zhuǎn)換梁上部框架構(gòu)件的內(nèi)力有向邊柱方向集中的趨勢(shì),尤其是與轉(zhuǎn)換層直接相連的一層,應(yīng)該是設(shè)計(jì)中引起重視的部位。在水平荷載作用下,隨著上部框架側(cè)移量的增大,轉(zhuǎn)換梁上部框架構(gòu)件的內(nèi)力也有較大增幅。⑵對(duì)大跨度轉(zhuǎn)換梁結(jié)構(gòu)體系來(lái)說(shuō),增大轉(zhuǎn)換梁上部框架邊梁和邊柱剛度能有效降低轉(zhuǎn)換梁的內(nèi)力,增大上部框架中柱并不能明顯地降低轉(zhuǎn)換梁的內(nèi)力。⑶在豎向荷載作用下,托柱轉(zhuǎn)換梁頂部壓應(yīng)力向梁端方向逐漸減小,僅在端部小范圍內(nèi)混凝土受拉;轉(zhuǎn)換梁底部的拉應(yīng)力向梁端方向逐漸減小,僅在端部小范圍內(nèi)混凝土受壓。型鋼混凝土轉(zhuǎn)換梁在靠近梁端部位主要由縱向鋼筋和箍筋來(lái)承擔(dān)內(nèi)力,在跨中方向主要由型鋼來(lái)承擔(dān)內(nèi)力。在滿足轉(zhuǎn)換梁剛度和承載力的情況下,適當(dāng)?shù)脑龃笮弯摫Ｗo(hù)層厚度可以改善轉(zhuǎn)換梁的延性及受力性能,型鋼翼緣寬度對(duì)轉(zhuǎn)換梁的延性影響較小。⑷在需要降低轉(zhuǎn)換梁撓度和增強(qiáng)轉(zhuǎn)換梁承載力時(shí),應(yīng)優(yōu)先考慮增大型鋼腹板厚度的方式來(lái)改善轉(zhuǎn)換梁的受力性能,但提高型鋼腹板厚度轉(zhuǎn)換梁的延性影響較大。⑸提高轉(zhuǎn)換梁的配筋率,會(huì)降低轉(zhuǎn)換梁的延性,對(duì)結(jié)構(gòu)抗震不利,易造成型鋼梁柱節(jié)點(diǎn)處的施工困難;適當(dāng)?shù)脑龃筠D(zhuǎn)換梁配筋率,可以提高轉(zhuǎn)換梁的承載力,有利于型鋼和縱筋的共同工作性能。
[Abstract]:In this paper, on the basis of the main shaft tower project in Menckeqing mine, the conversion beam in the pumping scheme of the bottom of the tower is designed as the section steel concrete transfer beam. By using the finite element software SAP2000, the static elastic analysis of the internal force distribution of the steel reinforced concrete transfer beam and the upper frame member supported by the transfer beam under horizontal and vertical loads is carried out. Compared with the internal forces of the corresponding parts of the frame on the ground, the change rules of the internal forces of the converted beam and the upper frame are analyzed and summarized, so as to explore the stiffness adjustment scheme of the upper frame members which can reduce the internal forces of the converted beams. The finite element software ABAQUS is used to analyze the mechanical behavior of long-span steel reinforced concrete transfer beams under vertical and horizontal loads, and the thickness and reinforcement ratio of steel web plates are studied. The influence of the thickness of the protective layer of section steel on the mechanical performance of the transfer beam, the following conclusions can be used for reference in the design of the well tower structure. 1. Compared with the landing frame, the internal force of the upper frame member of the transfer beam tends to concentrate in the direction of the side column. In particular, a layer that is directly connected to the conversion layer should be an important part of the design. Under the action of horizontal load, with the increase of the lateral displacement of the upper frame, the internal force of the upper frame member of the transfer beam also has a large increase. 2 for the long-span transfer beam structure system, Increasing the stiffness of the side beam and column in the upper frame of the transfer beam can effectively reduce the internal force of the transfer beam, and the increase of the column in the upper frame can not significantly reduce the internal force of the transfer beam. 3 under the vertical load, the internal force of the transfer beam can not be reduced significantly. The compressive stress at the top of the post transfer beam decreases gradually towards the end of the beam, and the concrete is pulled only in a small range at the end of the beam. The tensile stress at the bottom of the transfer beam decreases gradually towards the end of the beam, and the concrete is compressed only in a small range at the end. The internal forces of the steel-reinforced concrete transfer beam are mainly borne by longitudinal reinforcement and stirrups near the end of the beam, and mainly by the section steel in the middle direction of the span. Under the condition that the stiffness and bearing capacity of the transfer beam are satisfied, the ductility and mechanical performance of the transfer beam can be improved by properly increasing the thickness of the steel cover. The width of the flange has little effect on the ductility of the transfer beam. 4 when the deflection of the transfer beam is reduced and the bearing capacity of the transfer beam is strengthened, the way of increasing the thickness of the steel web should be given priority to improve the mechanical performance of the transfer beam. 5. Increasing the reinforcement ratio of the transfer beam will reduce the ductility of the transfer beam, which is unfavorable to the seismic resistance of the structure, and it is easy to cause the construction difficulty at the Liang Zhu joint of the section steel. (2) improving the ductility of the transfer beam with the thickness of the web plate has a great influence on the ductility of the beam. If the reinforcement ratio of the transfer beam is increased properly, the bearing capacity of the transfer beam can be improved, which is beneficial to the joint working performance of the section steel and the longitudinal reinforcement.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU398.9

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