可拆式钢筋桁架模板截面力学性能试验和计算方法

发布时间：2018-04-02 07:01

本文选题：可拆式模板　切入点：钢筋桁架　出处：《土木建筑与环境工程》2016年06期

【摘要】：通过对全尺寸可拆式钢筋桁架模板在施工阶段的截面力学性能试验,研究了其在单调荷载作用下的破坏形态以及受力机理。并分别采用荷载-挠度曲线法和极限弯矩法计算了截面特性。分析表明:施工阶段可以采用上下弦连续的桁架计算模型,荷载-挠度曲线法计算结果与理论值偏差较大,其原因是:试件破坏过程由变形控制,而非强度,以及由于连接件与钢筋的相对滑移产生的附加挠度,极限弯矩法计算值与理论值较为吻合。在此基础上,给出了简支或等跨连续(两跨)梁计算模型的最大无支撑长度的建议值。
[Abstract]:The failure mode and mechanical mechanism of the full scale removable steel truss formwork under monotonic load are studied by the test of the section mechanical properties of the formwork in the construction stage.The load-deflection curve method and the ultimate bending moment method are used to calculate the cross-section characteristics respectively.The analysis shows that the calculation model of upper and lower chord continuous truss can be used in the construction stage, and the calculation result of load-deflection curve method deviates greatly from the theoretical value. The reason is that the failure process of the specimen is controlled by deformation rather than strength.As well as the additional deflection caused by the relative slippage between the joint and the steel bar, the calculated value of the ultimate moment method is in good agreement with the theoretical value.On this basis, the suggested values of the maximum unsupported length of simply supported or equal span continuous (two span) beams are given.
【作者单位】：西安建筑科技大学土木工程学院;
【基金】：国家自然科学基金(51478382)~~
【分类号】：TU398.9

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