- 摘 要
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(1 重慶大學土木工程學院，重慶 400045；2 廣東省建筑設計研究院，廣州510010；3 青海建筑職業(yè)技術學院，西寧 810012；4 甘肅建筑職業(yè)技術學院，蘭州 730030)
［摘要］ 依托實際工程，采用縮尺模型，對兩類含沉板的樓面板進行了短期單調靜力荷載下的破壞性試驗。對樓面板破壞形態(tài)、變形特點、承載能力及特殊構造處理進行了試驗研究。結果表明：含沉板的樓面板整體變形特點與普通雙向板基本相同。在沉板肋梁交接部位及肋梁與吊梁交接部位，受力復雜，形成薄弱區(qū)域。在本試驗條件下，各試件在達到承載能力極限狀態(tài)之前，裂縫寬度和撓度均達到正常使用極限狀態(tài)控制的限值。最終破壞后，板底均形成了明顯的以“X”形為主的塑性鉸線，屬于雙向彎曲破壞，可按塑性理論計算板的極限承載力。配置了冷軋帶肋鋼筋的樓面板，開裂荷載大于實際工程中作用在樓板上荷載的標準組合值，使該板在正常使用中處于彈性階段，滿足工程實際的需要。
［關鍵詞］沉板；冷軋帶肋鋼筋；受力性能；試驗研究
中圖分類號：TU375-2文獻標識碼：A文章編號：1002-848X（2012）02-0127-06
Experimental study on mechanical behaviors of slab with bathroom concave
Liu Haifeng1,3, Zhang Lei1,4, Huang Huihui2, Sun Ning1, Fu Jianping1(1 College of Civil Engineering, Chongqing University, Chongqing 400045, China；2 The Architectural Design Research Institute of Guangdong Province, Guangzhou 510010, China; 3 Qinghai Architectural Vocational and Technical College, Xining 810012, China；4 Gansu Architectural Vocational and Technical College, Lanzhou 730030, China)
Abstract:Based on the engineering practice, two types of reduced scale models with concave slab were tested under short term static load till failure. Experimental studies were taken to learn the failure modes, deformations, supporting capacities and the details of the specimens. The results indicate that the overall deformation of the floors are similar with RC two-way slabs, complex stress regions and weak parts-appear at the conjunctions of the ribbon beams or at the conjunctions of the ribbon beam and the lifting beam. Before reaching the ultimate limit states, deflections and widths of cracks of all the specimens have reached the service limits. Significant ‘X’ plastic hinge lines occurred on the bottom of the slabs, which indicates that the slabs failed in two-way bending, and the ultimate load can be determined by plasticity theory. Compared with the possible characteristic combinations of engineering practice, the cracking loads of the specimens with cold-rolled deformed bars are much higher, which enables the slabs work elastic under service loads.
Keywords:concave slab; cold-rolled deformed bar; mechanical behavior; experimental study
作者簡介：劉海峰，碩士，副教授，Email:lhf_xn@163.com。
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