水平及竖向地震下的钢筋混凝土框架混合试验方法

Hybrid simulation method of reinforced concrete frames under combined excitation of horizontal and vertical earthquakes

以往的建筑结构混合试验方法大多只考虑水平地震作用或多维加载仅应用于验证性的简单结构案例,为拓展混合试验方法的应用,文中研发一种多高层钢筋混凝土框架结构在水平及竖向双向地震作用下的混合试验方法,并结合大型多功能加载设备MUST编制相应的混合试验程序。该方法对框架结构的振动模型建模时,结构水平振动采用串联质点系模型,竖向振动采用串并联质点系模型。结合设备的加载能力,对试验子结构边界条件进行合理简化并忽略节点的转动自由度。采用Matlab编写整体框架结构运动方程求解模块,连接OpenSees求解数值子结构的恢复力,在此基础上编写了相应的结构混合试验程序。对一榀七层三跨钢筋混凝土框架进行了虚拟混合试验和单独用OpenSees进行整体结构时程分析,线弹性和弹塑性假定下的内力和位移结果对比及误差分析表明文中方法具有较好的可行性和有效性。

Previously,only horizontal earthquake excitation was considered in most previous hybrid simulation methods for building structures,or simple structure cases were used for verification of multi-dimensional loading method.To enhance its application,a hybrid simulation method of multi-story reinforced concrete frame under the combined excitation of horizontal and vertical earthquakes is proposed.A corresponding program is developed connecting the multi-function loading equipment MUST for hybrid simulation.In this method,the series multi-degreeof-freedom model and the series-parallel multi-degree-of-freedom model are used for simulating the horizontal and vertical vibration separately.Because of loading capacity of the equipment,the boundary conditions of substructure are reasonably simplified and the rotation degrees of freedom are ignored for the nodes.A hybrid simulation program was developed by using Matlab to compile solving module of the vibration equation and OpenSees to calculate the restoring forces of the numerical substructure.With the assumptions of linear elasticity and elastoplasticity,virtual hybrid simulations and time history analysis with OpenSees of a seven-story three-bay frame are conducted.The validity and feasibility of the proposed method is illustrated with the comparison of force and displacement results and error analysis.