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为实现对钢桁加劲梁钢-混组合桥面系温度效应的精准分析,尝试应用了温度梯度效应的空间有限元计算法,通过算例验证,确定了空间有限元计算法的合理性;基于现行规范,提出了一种竖向温度梯度计算模型。以某大跨度钢桁加劲梁悬索桥为例,对该桥健康监测温度数据进行了分析,建立了竖向温度梯度模型;结合有限元程序及温度梯度模型,进行了空间竖向温度梯度效应研究。结果表明:有限元法计算精度高,适用于大型复杂结构的空间温度效应的分析;提出的钢-混组合桥面系的温度梯度计算模型精度高,且简单适用;钢-混组合桥面系竖向温度梯度效应十分明显,产生的应力不容忽视;该类型的钢-混组合桥面系竖向温度梯度与应力呈线性关系,相同结构的应力线性系数为定值。
In order to achieve accurate analysis of the temperature effect on steel-concrete composite deck of steel truss stiffening girder, the spatial finite element method of temperature gradient effect is applied. By the example verification, the rationality of the finite element method is confirmed. According to the current standard, a vertical temperature gradient calculation model is proposed. Taking a long span steel truss stiffened girder suspension bridge as an example, the temperature monitoring data of the bridge was analyzed and a vertical temperature gradient model was established. Combined with the finite element program and the temperature gradient model, the vertical temperature gradient effect was studied. The results show that the finite element method has high computational accuracy and is suitable for the analysis of spatial temperature effects of large and complex structures. The proposed temperature gradient calculation model of the steel-concrete composite deck system has high accuracy and is simple to apply. Vertical temperature gradient effect is very obvious, the stress generated can not be ignored; this type of steel-concrete composite bridge deck vertical temperature gradient and stress is a linear relationship, the same structure of the stress linear coefficient is constant.