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<p>Reactive powder concrete (RPC) has been widely used due to its high tensile and compressive strength and excellent durability. However, the failure mechanism of RPC local pressure is still unclear. Therefore, reasonable structural dimensions of the finite element model (FEM) and the relevant parameters of the RPC were selected to deeply explore the local pressure of the RPC under the local loading. The FEM of the axial local compression of the RPC with different constitutive models was built. The whole nonlinear analysis process of the local pressure of RPC was completed, and the failure mode, stress distribution, and maximum plastic principal strain of the specimen were analyzed. The model shows that the local pressure performance of RPC is improved due to the increase of ultimate tensile strength, the local pressure failure mode of RPC conforms to the wedge split theory, and the orthogonal ties can uniformly distribute the pressure stresses.</p>

<p>This paper investigated the seismic performance of steel frames under earthquake motion. Two- story steel frames were designed based on a code-design method for a medium and high-risk seismic zone. The frame's nonlinear static and dynamic analyses have been performed using OpenSees software and sap2000. We consider diverse configurations, concentrated plasticity, and fiber-model were employed. The results obtained in the analytical study concluded that the user design method was reasonable and the mean maximum drift of the frames under the ground motion sets was in an acceptable range.</p>

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