组合空腹梁的静力特性研究

Study on static behavior of composite Vierendeel beam

提出了一种新的组合空腹板结构形式,它由下层交叉钢肋、上层混凝土板及连接上下层并使之共同工作的钢管或钢管混凝土剪力键组合而成。为研究该类结构的静力特性,对组合空腹板的组成单元——组合空腹梁进行了足尺模型试验,侧重研究组合空腹梁下层钢肋、上层混凝土板的内力分布规律;对组合空腹板建立了基于空间梁单元与壳单元的混合元计算模型、空间壳单元计算模型两种有限元分析方法,对试验模型进行了理论分析。将试验数据、两种有限元计算方法的计算结果进行了比较。研究结果表明,组合空腹梁的内力分布均匀,能较好地发挥材料强度,具有刚度大、整体性好的特点;对简支组合空腹梁,其下层钢肋处于拉-弯、上层混凝土板处于压-弯的受力状态,弯曲应力在总应力中占了较大的比例;研究结果同时也验证了理论分析的可靠性。

A new construction form of composite Vierendeel plate is brought f or ward in this paper. It is made of lower crossing steel ribs, upper concrete plat e and shear blocks of steel tubes or concrete-filled steel tubes which connect the upper and the lower members and make them work together. In order to study t he static behavior of this structure, composite Vierendeel beams, the basic unit of the composite Vierendeel plate, were analyzed. A full scale model composite Vierendeel beam was tested. The law of internal force distribution for upper con crete plate and lower steel ribs of the composite Vierendeel beams had been stud ied in detail. Two theoretical calculation models, the combination of beam eleme nt and shell element model and the spatial shell element model were established to analyze the composite Vierendeel plate. Experimental data and the results of the two theoretical calculation models were then compared. Investigation showed that the composite Vierendeel beam has the uniformity of the internal force dist ribution, full play to material strength, better rigidity under loads and struct ural integrity. For the simply supported composite Vierendeel beam whose lower s teel ribs are under tension-bending and upper concrete plate is under compressi on-bending,while both the bending stresses take greater proportion of the total stresses. The reliability of the theoretical analysis method has been verified in this paper.