Adopting the triangle elements to fill the design region, the difficulty to divide irregular design domain by rectangular elements is overcome.

采用三角形单元进行有限元的分析，克服矩形单元对不规则区域划分单元的局限性。

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We focus on the inverted triangle truss structure in practical engineering, while a rectangular truss structure is designed as a comparison. Both of these two kinds are all analyzed.

在结构优化设计中，针对实际工程的倒三角形桁架结构，同时又设计了矩形桁架结构作为对比，对这两种桁架进行结构优化。

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