【摘要】：針對(duì)現(xiàn)有鉸接空心板橋的薄弱部位——鉸縫,提出一種在空心板與鉸縫結(jié)合面底部設(shè)開孔鋼板的空心板構(gòu)造,通過開孔鋼板改變結(jié)合面裂縫開展的路徑,達(dá)到延緩空心板與鉸縫結(jié)合面通縫形成的目的,并進(jìn)行了8m跨徑的鉸接空心板足尺模型試驗(yàn)。在試驗(yàn)和非線性有限元分析的基礎(chǔ)上,與結(jié)合面底部帶鋼筋的鉸接空心板試驗(yàn)進(jìn)行了對(duì)比。分析結(jié)果表明:當(dāng)試驗(yàn)荷載為100kN(1.43倍車輛荷載)時(shí),空心板跨中出現(xiàn)橫向裂縫,空心板梁整體剛度降低,空心板受力狀態(tài)由彈性階段進(jìn)入彈塑性階段;在試驗(yàn)荷載加至300kN(4.29倍車輛荷載)為止的整個(gè)加載過程,未觀察到空心板與鉸縫結(jié)合面底部出現(xiàn)裂縫;當(dāng)結(jié)合面底部設(shè)門式鋼筋時(shí),裂縫沿結(jié)合面從下向上擴(kuò)展,最終形成通縫,然而,當(dāng)結(jié)合面底部設(shè)開孔鋼板后,鉸縫沿結(jié)合面開裂至開孔鋼板下方后,裂縫的擴(kuò)展需要繞過開孔鋼板,使得開孔鋼板下方鉸縫混凝土開裂后,再沿開孔鋼板上方結(jié)合面向上擴(kuò)展,形成通縫;鉸縫開裂荷載由結(jié)合面設(shè)置鋼筋的69kN(0.99倍車輛荷載)提高到314kN(4.49倍車輛荷載),提高了3.50倍;鉸縫形成通縫時(shí)的荷載由結(jié)合面設(shè)置鋼筋的199kN(2.84倍車輛荷載)提高到489kN(6.99倍車輛荷載),提高了4.51倍�？梢�,在結(jié)合面底部設(shè)開孔鋼板后,鉸縫裂縫開展路徑發(fā)生變化,延緩了空心板與鉸縫結(jié)合面的開裂。
[Abstract]:In view of the weak position of the existing hinged hollow slab bridge, the hinged joint, a kind of hollow slab structure with perforated steel plate at the bottom of the joint surface between the hollow slab and the hinge joint, is proposed, and the crack path of the joint surface is changed by the perforated steel plate. In order to delay the formation of joint between hollow slab and hinge joint, the full-scale model test of 8m span hinged hollow plate was carried out. On the basis of experiment and nonlinear finite element analysis, the experiment of hinged hollow slab with reinforcing bar at the bottom of joint surface is compared. The results show that when the test load is 100kN (1.43 times vehicle load), transverse cracks appear in the hollow slab span, the overall stiffness of the hollow slab beam decreases, and the stress state of the hollow slab moves from elastic stage to elastic-plastic stage. During the whole loading process when the test load was added to 300kN (4.29 times vehicle load), no cracks were observed at the bottom of the joint plane between the hollow slab and the hinge joint. When the gate steel bar is arranged at the bottom of the bonding surface, the crack extends from the bottom of the joint surface and forms a through joint. However, when the bottom of the joint surface is set with a perforated steel plate, the hinge joint cracks along the joint surface to the bottom of the open hole plate. The crack propagation needs to circumvent the perforated steel plate, make the concrete crack under the perforated steel plate, and then expand along the top of the perforated steel plate to form the through joint. The cracking load of hinged joints was increased from 69kN (0.99 times vehicle load) to 314kN (4.49 times vehicle load), which increased 3.50 times. When the joint is formed, the load is increased from 199kN (2.84 times vehicle load) to 489kN (6.99 times vehicle load), which increases 4.51 times. It can be seen that the crack development path of the hinge joint changes after the opening plate is set at the bottom of the joint surface, which delays the cracking of the hollow slab and the joint surface.
【作者單位】： 福州大學(xué)土木工程學(xué)院;長崎大學(xué)工學(xué)部;
【基金】：國家自然科學(xué)基金項(xiàng)目(51678154) 教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃項(xiàng)目(NCET-13-0737) 河北省交通科技項(xiàng)目(Y-2014045)
【分類號(hào)】：U441

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